Operator’s Manual
Maxi-Heat
®
Mobile Heater
Copyright © 2018 Allmand Bros., Inc.
Holdrege, NE, USA. All rights reserved.
Part No.: 108284RU
Revision: B
en
Руководство оператора
Мобильный нагреватель Maxi-Heat
®
ru
Not for
Reproduction
2
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Record Important Information
Recording the equipment information will help when placing
an order for replacement parts and/or decals.
Company Equipment No:____________________________
Unit model No:____________________________________
Unit Vin:_________________________________________
Engine Model No: ____________Serial No:_____________
Generator Model No:__________Serial No:_____________
Accessories:_____________________________________
_______________________________________________
_______________________________________________
Manual Contents:
Introduction ........................................................................2
Safety ...................................................................................2
Features and Controls .......................................................9
Transporting ..................................................................... 12
Operation ......................................................................... 18
Maintenance .................................................................... 29
Specifications .................................................................. 33
Troubleshooting .............................................................. 35
Introduction
About This Manual
TAKE TIME TO READ THIS MANUAL THOROUGHLY
This instruction manual provides necessary instructions for
the MAXI-HEAT mobile heater.
The information found in this manual is in effect at the time
of printing. Allmand Bros Inc. may change contents without
notice and without incurring obligation.
Any reference in this manual to left or right shall be deter-
mined by looking at the trailer from the rear.
If you are uncertain about any of the information in the man-
ual, contact Allmand service department at 1-800-562-1373,
or contact us through the Allmand website, www.allmand.
com.
Save these original instructions for future reference.
Products Covered by This Manual
The following products are covered by this manual:
Maxi-Heat
®
MH500iQ Mobile Heater
Maxi-Heat
®
MH500iQ FCS Mobile Heater
Safety
Safety Definitions
Safety statements are one of the primary ways to call your
attention to potential hazards. Follow the precautions listed
throughout the manual before operation, during operation
and during periodic maintenance procedures for your safety,
the safety of others and to protect the performance of equip-
ment. Keep the decals from becoming dirty or torn and
replace them if they are lost or damaged. Also, if a part needs
to be replaced that has a decal attached to it, make sure to
order the new part and decal at the same time.
This safety alert symbol appears with most safety
statements. It means attention, become alert, your
safety is involved! Read and abide by the message
that follows the safety alert symbol.
DANGER
Indicates a hazardous situation which, if not avoided, will
result in death or serious injury.
WARNING
Indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION
Indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE
Indicates a situation which can cause damage to the equip-
ment, personal property and/or the environment, or cause the
equipment to operate improperly.
Safety Precautions
The following section contains general safety precautions
and guidelines that must be followed to reduce risk to per-
sonal safety. Special safety precautions are listed in specific
procedures. Read and understand all of the safety precau-
tions before operating or performing repairs or maintenance.
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DANGER
Electrocution Hazard
• Servicing electrical components while the engine is
running will result in death or serious injury. Always
shut down the engine before servicing electrical com-
ponents.
• Capacitors are capable of discharging high volt-
age that will result in death or serious injury. Always
shutdown the engine, then discharge capacitors by
grounding them with an insulated device.
• Contact with wires that have been made bare by dam-
aged, cut, or worn insulation will result in death or
serious injury. Always replace damaged wiring before
starting the engine or operating the unit.
WARNING
Unsafe Operation Hazard
• Never permit anyone to install or operate the equip-
ment without proper training.
• Read and understand this Operator’s Manual and the
Engine Operator’s Manual before operating or servic-
ing the light tower to ensure that safe operating prac-
tices and maintenance procedures are followed.
• Safety signs and decals are additional reminders for
safe operating and maintenance techniques.
WARNING
Fall Hazard
• Never carry riders on the equipment.
WARNING
Modification Hazard
• Never modify the equipment without written consent of
the manufacturer. Any modification can effect the safe
operation of the equipment.
WARNING
Exposure Hazard
• Always wear personal protective equipment, including
appropriate clothing, gloves, work shoes, and eye and
hearing protection, as required by the task at hand.
WARNING
Explosion Hazard
• While the engine is running or the battery is charging,
hydrogen gas is being produced and can be easily
ignited. Keep the area around the battery well venti-
lated and keep sparks, open flame and any other form
of ignition out of the area.
• Always disconnect the negative (-) battery cable
before servicing equipment.
• Only use the starting procedure as described in the
Engine Operator’s Manual to start the engine.
• Never charge a frozen battery. Always slowly warm the
battery to room temperature before charging.
WARNING
Fire And Explosion Hazard
• Diesel fuel is flammable and explosive under certain
conditions.
• Never use a shop rag to catch fuel.
• Wipe up all spills immediately.
• Never refuel with the engine running.
• Store any containers containing fuel in a well venti-
lated area, away from any combustibles or sources of
ignition.
WARNING
Exhaust Hazard
• All internal combustion engines create carbon monox-
ide gas during operation and special precautions are
required to avoid carbon monoxide poisoning.
• Never block windows, vents or other means of ventila-
tion if the equipment is operating in an enclosed area.
• Always ensure that all connections are tightened to
specifications after repair is made to the exhaust sys-
tem.
WARNING
Alcohol And Drug Hazard
• Never operate the light tower while under the influence
of alcohol or drugs, or when ill.
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WARNING
Entanglement / Sever Hazard
• Always stop the engine before beginning service.
• If the engine must be serviced while it is operating,
remove all jewelry, tie back long hair and keep hands,
other body parts and clothing away from moving/rotat-
ing parts.
• Verify that all guards and covers are attached properly
to the equipment before starting the engine. Do not
start the engine if any guards or covers are not prop-
erly installed on the equipment.
• Attach a “Do Not Operate” tag near the key switch
while performing maintenance on the equipment.
WARNING
Control Hazard
An underrated tow hitch could cause loss of control of the
towing vehicle or trailer, resulting in death or serious injury.
Always:
• Make sure that the vehicle’s towing capacity exceeds
that of the trailer load.
• Make sure that the vehicle’s hitch and ball are rated to
accept the trailer load, and are the appropriate size for
the trailer coupler socket.
• Dragging safety chains on the road surface could
cause them to fail in an emergency, resulting in death
or serious injury. Always attach safety chains properly
and securely between the tow vehicle and the trailer,
and do not let them drag on pavement.
WARNING
Flying Object Hazard
• Always wear eye protection when cleaning the equip-
ment with compressed air or high pressure water.
Dust, flying debris, compressed air, pressurized water
or steam may injure your eyes.
WARNING
Coolant Hazard
• Wear eye protection and rubber gloves when handling
engine coolant. If contact with the eyes or skin should
occur, flush eyes and wash immediately with clean
water.
WARNING
Burn Hazard
• Rapid release of hot coolant under pressure could
result in death or serious injury. Use extreme caution
when opening the radiator cap, and always wear eye
protection and heat resistant gloves.
• Contact with hot surfaces of the heater unit could
result in death or serious injury. Always keep clear of
heater unit chimney, air outlet components and other
hot areas of the heater unit.
WARNING
California Proposition 65
• Certain components in this product and related
accessories contain chemicals known to the State
of California to cause cancer, birth defects, or other
reproductive harm. Wash hands after handling.
WARNING
California Proposition 65
• Battery posts, terminals and related accessories con-
tain lead and lead compounds, chemicals known to
the State of California to cause cancer and reproduc-
tive harm. Wash hands after handling.
CAUTION
Tool Hazard
• Always use tools appropriate for the task at hand and
use the correct size tool for loosening or tightening
equipment parts.
CAUTION
Slip Hazard
• Immediately clean up any spilled liquid on the shop
floor.
• Clean up accumulated dirt and debris on the shop
floor at the end of each shift.
NOTICE
The statements that follow have NOTICE level issues.
Damage to equipment or property can result if not fol-
lowed.
• Any part which is found defective as a result of inspection
or any part whose measured value does not satisfy the
standard or limit MUST be replaced.
• Always tighten components to the specified torque.
Loose parts can cause equipment damage or cause it to
operate improperly.
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• Follow the guidelines of the Environmental Protection
Agency (EPA), Environment Canada (EC) or other gov-
ernmental agencies for the proper disposal of hazardous
materials such as engine oil, diesel fuel and engine cool-
ant.
• Only use replacement parts specified. Other replacement
parts may effect warranty coverage.
• Clean all accumulated dirt and debris away from the
body of the equipment and its components before you
inspect the equipment or perform preventative mainte-
nance procedures or repairs. Operating equipment with
accumulated dirt and debris will cause premature wear of
equipment components.
• Never dispose of hazardous materials by dumping them
into a sewer, on the ground, or into groundwater or water-
ways.
• Retrieve any tools or parts that may have dropped inside
of the equipment to avoid improper equipment operation.
• If any alert indicator illuminates during equipment opera-
tion, stop the engine immediately. Determine the cause
and repair the problem before continuing to operate the
equipment.
Notification of Safety Defects
If you believe that your vehicle has a defect that could
cause a crash or could cause injury or death, you should
immediately inform the National Highway Traffic Safety
Administration (NHTSA) in addition to notifying Allmand.
If NHTSA receives similar complaints, it may open an inves-
tigation, and if it finds that a safety defect exists in a group
of vehicles, it may order a recall and remedy campaign.
However, NHTSA cannot become involved in individual prob-
lems between you, your dealer, or Allmand.
To contact NHTSA, you may either call the Vehicle Safety
Hotline toll-free at 1-888-327-4236 (TTY: 1-800-424-9153),
go to http://www.safercar.gov; or write to:
Administrator
NHTSA
1200 New Jersey Avenue S.E.
Washington, DC 20590
You can also obtain other information about motor vehicle
safety from http://www.safercar.gov.
Safety Decals
Before operating your unit, read and understand the following
safety decals. The cautions, warnings, and instructions are
for your safety. To avoid personal injury or damage to the unit,
understand and follow all the decals.
Compare Figures 1 through 3 with the tables following.
WARNING
If any safety or instructional decals become worn or dam-
aged, and cannot be read, order replacement decals from
your dealer.
Figure 1
A
B
C D
DE
E
Left View
Right View
Top View
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Figure 2
F
F
F
Heater Units
Heater Breaker Box
Figure 3
G
H
I J K L M
Inside Rear Door
N O
Inside Left Door
P
Fuel Tank
Domestic Models
A Tire Information
Part No. 108360
B WARNING - Excessive
Towing Speed. To pre-
vent serious injury, death
or equipment damage,
do not exceed 55 mph
(88 km/h).
Part No. 090160
C Diesel Fuel - Use ultra
low sulfur fuel only.
Part No. 107045
D Lift Point - Rated at 3000
lbs (1361 kg)
Part No. 106762
E WARNING - Hot surface
could burn exposed skin
which could result in
death or serious injury.
Hot components must
be cool before handling,
or handle hot compo-
nents with heat resistant
gloves.
Part No. 090108
F DANGER - Contacting
High Voltage
Components. Contact
with high voltage
components within
this compartment will
result in death or seri-
ous injury. Do not enter
electrical compartments
when engine is run-
ning. Always close cover
before operating the
machine.
Part No. 090162
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G WARNING -
1. The requirements of
local authorities having
jurisdiction shall be fol-
lowed.
2. Machine to be ground-
ed in accordance with
requirements as out-
lined by local inspection
authorities.
3. Do not fill fuel tank
while engine is running.
4. Do not tamper with
the unit. Only competent
service personnel should
make adjustments.
Part No. 101062
H WARNING - Read
Operator’s Manual.
Read and understand
the Operator’s Manual
before operating this
machine.
Part No. 090158
I Engine Operating
Instructions
Part No. 090304
J WARNING / Heater
Instructions
Part No. 106816
K DANGER - Ground Rod.
Operating the machine
without first installing the
ground rod will result in
death or serious injury.
Drive the ground rod
into the earth and attach
ground wire to ground-
ing lug.
Part No. 106934
DANGER
ELECTRICAL SHOCK HAZARD
Failure to use ground rod
could cause severe injury or death.
Drive ground rod into earth and
attach ground wire to grounding lug.
106934
L WARNING - Do not
operate this unit around
combustible materials.
Fire may result.
Part No. 090143
M WARNING - Do not
operate inside a building
or partly ventilated area.
This unit will produce
carbon dioxide and car-
bon monoxide, which
can lead to asphyxiation.
Part No. 090142
N No Step
Part No. 090147
O Notice
Kinks in ducting could
cause excessive pres-
sure and heat, resulting
in unit damage.
Part No. 106824
P WARNING - Explosive
Gases. Explosive gases
could result in death or
serious injury. Keep open
flame and lighted materi-
als away from battery.
Part No. 090159
International Models
NOTE: Decal locations may differ from figures shown.
A --- ---
B WARNING - Excessive
Towing Speed. To pre-
vent serious injury, death
or equipment damage,
do not exceed 55 mph
(90 km/h).
Part No. 107520
107520
≤ 90 km/h (55 mph)
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C Diesel Fuel - Use ultra
low sulfur fuel only.
Part No. 107045
D Lift Point - Rated at 3000
lbs (1361 kg)
Part No. 106762
E WARNING - Hot surface
could burn exposed skin
which could result in
death or serious injury.
Hot components must
be cool before handling,
or handle hot compo-
nents with heat resistant
gloves.
Part No. 107529
107529
F DANGER - Contacting
High Voltage
Components. Contact
with high voltage
components within
this compartment will
result in death or seri-
ous injury. Do not enter
electrical compartments
when engine is run-
ning. Always close cover
before operating the
machine.
Part No. 104880
G --- ---
H WARNING - Read
Operator’s Manual.
Read and understand
the Operator’s Manual
before operating this
machine.
Part No. 105508
I,J Operating Instructions
Part No. 107521
1 2
1 2 3
4
0° ± 1.4°
4 6
8 ft (2.5 m)
5
A
B
1 2 3 4 5 6
A
B
A
B
B
B
A
A
C
A
B
C
< 130°F (55°C)
107521
K DANGER - Ground Rod.
Operating the machine
without first installing the
ground rod will result in
death or serious injury.
Drive the ground rod
into the earth and attach
ground wire to ground-
ing lug.
Part No. 107255
L WARNING - Do not
operate this unit around
combustible materials.
Fire may result.
Part No. 107526
M WARNING - Do not
operate inside a building
or partly ventilated area.
This unit will produce
carbon dioxide and car-
bon monoxide, which
can lead to asphyxiation.
Part No. 107524
N No Step
Part No. 107522
O Notice
Kinks in ducting could
cause excessive pres-
sure and heat, resulting
in unit damage.
Part No. 107528
P WARNING - Explosive
Gases. Explosive gases
could result in death or
serious injury. Keep open
flame and lighted materi-
als away from battery.
Part No. 104877
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Features and Controls
Overview
Allmand mobile indirect fired heater trailers are intended to
provide a self-contained heating solution for remote locations
where external power is not available. An indirect fired heater
separates the combustion chamber from the heated air,
allowing clean breathable heated air to flow to the ducting.
The heater trailer contains two heater units each capable of
producing a maximum of 515,000 BTU/hr.
The heater trailer features a control module that keeps the
burner at optimum efficiency. The control module displays
the proper damper setting for the elevation, barometric pres-
sure and temperature at its location. The operator need only
set the damper at the prescribed setting and start the heater
unit. Tuning off the burner, changing the nozzle and checking
with a Bacharach smoke tester is not necessary.
The heater trailer is powered by either a Caterpillar or Isuzu
1.5 liter diesel engine, driving a 9kW generator. The genera-
tor provides a nominal 115 volt AC power to the heaters. The
heaters may be disconnected from the on-board generator
and plugged into a 60 Hertz, 115 volt 30 amp receptacle.
Front View
Compare Figure 4 with the table following.
Figure 4
A
B
C
E
D
F
G
H
I
J
K
L
Ref Description
A Fuel Cap
B Air Intake Vent Cover
C Serial Plate
D Fluid Containment Drain (if equipped; under chassis)
E Heating Unit Outlet Access Door
F Duct Storage Box
G Tongue Jack
H Safety Chains
I Ball Hitch
J Lunette Ring
K Duct Storage Box Cover
L Door Holder
Operation Icons
The following table contains operation icons that may be
found on the unit, along with the meaning of each icon.
Icon Meaning Icon Meaning
Read Operator’s
Manual
Earth Ground
On (Power) Off (Power)
Tie Down Lift Point
Diesel Fuel Fuel Tank
Heater 1 Heater 2
Hourmeter Trailer Interior
Light
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Rear View
Compare Figure 5 with the table following.
Figure 5
A
B
C
D
E
F
G
H
I
J
N
K
M
L
Ref Description
A Engine Cover Door
B Door Holder (each side)
C Lift Ring
D Heater 2 Chimney
E Heater 1 Chimney
F Tongue Tie Down Loop (Hidden from View)
G Heating Unit Control Access Door
H Fluid Containment Drains (if equipped; under chassis)
I Radiator Cap Access Panel
J Engine Radiator Vent Cover
K Taillight
L Oil Drain
M License Plate Bracket
N Rear Tie Down
Engine Controls - Caterpillar / Isuzu
The engine controls are located under the engine cover door
on the lower left of the opening.
Compare Figures 6 and 7 with the table following.
Figure 6
A
B
C
D
Figure 7
B
C
DE
A
A Ignition Switch Caterpillar - Turn the key switch to the left
(counterclockwise) to preheat the glow plug.
After 10 seconds, turn the key to the right
(clockwise). First position is Engine Run,
second is Engine Start.
Isuzu - Turn the key switch to the left
(counterclockwise) to preheat the glow plug.
The glow plug indicator will illuminate. After
the indicator shuts o (approximately 15
seconds), turn the key to the right
(clockwise). First position is Engine Run,
second is Engine Start.
B Hourmeter Indicates the total number of hours the
engine has been running.
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C Fuel Gauge For machines equipped with three fuel
tanks, this gauge indicates the fuel level in
each tank.
D Interior Work
Light
Turns the interior work light on or o.
E Glow Plug
(Isuzu Only)
Isuzu Engine - Light illuminates when glow
plugs are turned on, and shuts o when hot
enough to start engine.
Heater Controls
The heater controls are located inside the heater control
access door on the right side of the machine. Each heater
has its own controls.
Compare Figure 8 with the table following.
AB
Figure 8
A Heater LCD
Display
Displays information on the heater. See
LCD Display.
B Heater Start
Button
Starts the heater.
LCD Display
The LCD display panel on the heater unit displays various
information regarding the heater unit and its performance.
Each heater unit has its own display.
Compare Figure 9 with the table following.
A
B
C
D
E
F
G
H
Figure 9
A Barometer Barometric pressure in millibars
B Ambient
Temperature
Actual (unheated) air temperature in
degrees Fahrenheit
C Damper Setting Number damper should be set to for
maximum eciency. See Damper
Control.
D Heater Operating
Status
- “START”: Heater unit is o; press Heater
Start Button to start heater unit
- “STOP”: Heater unit is on; press Heater
Start Button to turn heater unit o
E Heater Eciency Eciency of heater unit in percentage
F Target
Temperature
Target temperature of heater outlet in
degrees Fahrenheit
G Outlet
Temperature
Actual temperature of heater outlet in
degrees Fahrenheit
H Hourmeter Total hours on heater unit
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Damper Control
The burner on each heater control has a damper which must
be adjusted to the damper setting displayed on the LCD dis-
play.
Compare Figure 10 with the table following.
Figure 10
B
A
C
A Damper Setting
Gauge
Indicator numbers assist in setting the
damper to the appropriate opening.
B Damper Pointer Indicates damper setting.
C Damper Lock
Wing Nut
(partially hidden
from view)
Loosen to allow setting of damper. Tighten
to lock damper setting.
Transporting
WARNING
Operating or towing a machine with worn, damaged or
missing parts can result in death or serious injury. Always
replace worn, damaged or missing parts promptly. Do not
operate or tow this machine until all worn, damaged or
missing parts have been replaced, and proper operation of
the machine has been verified.
Pre-Transport Check List
1. Check that the operator’s manuals are with the heater
trailer, in the manual storage container.
2. Check that all safety decals are legible and in place on
the heater trailer. See “Safety Decals” in the Safety sec-
tion of this manual.
3. Check the heater trailer for proper operation:
a. Use an appropriate means to safely support the trailer
tongue. Check that the tongue jack operates properly,
and that the jack lock pin can be locked in the trans-
port position as well as the trailer support position.
See “Operating The Tongue Jack”.
b. Check that the trailer coupler operates properly, and
that the combination trailer coupler / lunette eye is
securely fastened to the heater trailer tongue. See
“Using The Trailer Coupler” and “Combination Trailer
Coupler And Lunette Eye”.
c. Check that the safety chains are properly secured to
the heater trailer tongue, and check the safety chains
and hooks for damage. Replace damaged safety
chains and hooks.
d. Check the trailer lighting connector for damage, and
the trailer lighting wires for damage. Replace or repair
damaged lighting connector or wiring.
e. Check the break-away trailer brake system, and make
sure the break-away brake system battery is fully
charged. See “Break-Away Brake System”.
f. Check the condition and inflation pressure of the tires.
See “Checking the Tire Pressure” in the Maintenance
section.
WARNING
Towing a trailer with worn, damaged or underinflated tires
could result in death or serious injury. Always replace worn
or damaged tires promptly. Always keep tires inflated to
proper cold tire inflation pressure.
4. Check that the ground rod is with the machine. Check
ground rod cable and the grounding lug on the chassis to
make sure they are clean and undamaged. Check that
there is continuity between:
a. The ground lug and the generator ground. (On some
models, the ground lug is connected to the heater
breaker box.)
b. The ground rod and the eyelet connector on the
ground rod cable.
5. Check the engine oil level and add as necessary. See
“Engine Oil” in the Maintenance section.
6. Check the engine cooling system and add as necessary.
Make sure that the coolant overflow bottle is at least 1/3
full of coolant. See “Engine Coolant” in the Maintenance
section.
7. Check the air filter for damage and replace as necessary.
Check the engine air intake system and make sure all
connections are air tight.
8. Check the battery for adequate charge. The heater
trailer is equipped from the factory with a 12 volt bat-
tery. Use a 12 volt battery charger to bring the battery
back to full charge. See “Maintaining the Battery” in the
Maintenance section.
9. If the trailer was stored with the battery disconnected,
reconnect the battery, negative (-) cable last.
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10. Check that there is sufficient fuel in the fuel tank(s), and
add if needed. See “Fueling” in the Operation section.
11. Check that the damper system on the heater burner units
operates properly. See “Operating The Heating Unit” in
the Operation section for detailed information on setting
the damper.
12. Check to be sure that the fuel shut-off valve for each
heater unit is in the “open” position.
13. Check that the engine starts and runs properly. See
“Starting The Engine” in the Operation section as well as
the engine operator’s manual for detailed information on
operating the engine.
14. Check that each heater unit starts and runs properly.
See “Operating The Heating Unit” in the Operation sec-
tion for detailed information on operating the heater unit.
15. If the heater trailer is equipped with a duct box, check
that there is sufficient ducting of the correct diameter for
the heater unit outlets in the duct box.
16. Make sure all covers and doors are closed and securely
latched.
Preparing The Unit For Towing
WARNING
Towing a trailer with an underrated tow vehicle, or an
underrated or undersized hitch could result in death or
serious injury. Always use a tow vehicle that has a rated
towing capacity that exceeds the Gross Vehicle Weight
Rating (GVWR) of the trailer, and is equipped with the
appropriate size tow hitch rated for the GVWR of the trailer.
1. Check the tow vehicle’s owner / operator manual for the
maximum rated towing capacity. Make sure the tow vehi-
cle and its trailer hitch are rated to tow the heater trailer.
See “Heater Trailer Weight” for detailed information on
trailer weight.
2. Check the tow vehicle’s lighting connector and make
sure it will mate with the trailer lighting connector on the
heater trailer. Check that the auxiliary power wire on the
tow vehicle is connected and powered to operate the
break-away brake system.
3. The heater trailer is equipped with both a SAE J684
coupler (for 2 inch / 50 mm diameter ball), and a
SAE J847 lunette eye (3 inches / 75 mm diameter).
Determine which is to be used for towing the trailer.
See “Combination Trailer Coupler And Lunette Eye” for
detailed information on changing between the trailer cou-
pler and the lunette eye.
4. Check that the safety chains are properly secured to the
heater trailer tongue, and check the safety chains and
hooks for damage. Replace damaged safety chains and
hooks.
5. Check the trailer lighting connector for damage, and the
trailer lighting wires for damage. Replace or repair dam-
aged lighting connector or wiring.
6. Check the break-away trailer brake system, and make
sure the break-away brake system battery is fully
charged. See “Break-Away Brake System” for detailed
information on the break-away brake system.
7. Check the condition and inflation pressure of the tires.
See “Checking the Tire Pressure” in the Maintenance
section for detailed information on tires and tire inflation
pressures.
WARNING
Towing a trailer with worn, damaged or underinflated tires
could result in death or serious injury. Always replace worn
or damaged tires promptly. Always keep tires inflated to
proper cold tire inflation pressure.
8. Use an appropriate means to support the trailer tongue.
Check that the tongue jack operates properly, and that
the jack lock pin can be locked in the transport position
as well as the trailer support position. See “Operating
The Tongue Jack” for detailed information on operating
the tongue jack.
9. Connect the trailer coupler or lunette eye to the tow vehi-
cle trailer hitch or pintle hook. Connect the safety chains
and trailer lighting connector to the tow vehicle. See
“Connecting The Trailer To The Tow Vehicle” for detailed
information.
10. Make sure all covers and doors are closed and securely
latched.
Combination Trailer Coupler And
Lunette Eye
The heater trailer is equipped with a standard adjustable
height, reversible combination trailer coupler and lunette
eye. The SAE J684 trailer coupler (for 2 inch / 50 mm diam-
eter ball) is rated at 7,000 pounds (3,175 kg) GVWR. The
lunette eye is 3 inches (75 mm) in diameter conforming to
the requirements of SAE J847 for 6,000 pounds (2,722 kg)
GVWR.
To change the position of the trailer coupler and the lunette
eye:
1. Check the tongue, trailer coupler and lunette eye for
missing and damaged parts. Replace any part that is
missing or damaged.
2. Remove the two hex head screws (A, Figure 10) and lock
nuts (B) securing the tubular portion of the lunette eye to
the tongue. Discard the lock nuts.
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3. Select either the trailer coupler or lunette eye (whichever
is required to couple the heater trailer to your tow vehi-
cle), and position it at the front of the tongue. Determine
the height which works best for your tow vehicle.
4. Insert the two hex head screws removed in Step 1
through the appropriate holes in the tongue and through
the holes in the tubular portion of the lunette eye (C, D,
Figure 10).
WARNING
Failure to secure the screws and nuts holding the combi-
nation trailer coupler and lunette eye to the heater trailer
tongue could cause the heater trailer to separate from the
tow vehicle resulting in death or serious injury. Always
check and tightly secure the screws holding the combina-
tion trailer coupler and lunette eye to the tongue.
5. Using new lock nuts, install nuts on the two hex head
screws and tighten.
Figure 10
A
B
D
C
Connecting The Trailer To The Tow
Vehicle
1. Make sure that wheel chocks are placed on both sides of
each of the heater trailer’s wheels.
2. Use the tongue jack to raise the trailer coupler or lunette
eye above the tow vehicle’s hitch ball or pintle hook. See
“Operating The Tongue Jack” for detailed information on
operating the tongue jack.
3. Position the tow vehicle’s hitch ball or pintle hook under
the trailer coupler or lunette eye.
4. Lower the trailer coupler or lunette eye onto the hitch ball
or pintle hook with the tongue jack.
5. Lock the trailer coupler or pintle hook. See “Using The
Trailer Coupler” or “Using A Pintle Hook” for detailed cou-
pling information.
6. Attach the safety chains (A, Figure 11) to the tow vehi-
cle’s hitch frame. Cross the chains under the tongue as
shown in Figure 11. Leave enough slack in the chains to
allow for turns, but not so much that the chains will con-
tact the road surface.
7. Connect the trailer lighting connector to the tow vehicle’s
connector (B, Figure 11). Make sure the trailer lighting
harness has adequate length to prevent disconnection
when turning, but not so much length that the harness
will contact the road surface. Check the stop, turn sig-
nal, tail, side marker and license plate lamps for proper
operation.
8. Connect the break-away brake switch cable to the tow
vehicle. See “Break-Away Brake System” for detailed
information on the break-away brake system.
9. Retract the tongue jack all the way, and place the jack in
transport position. See “Operating The Tongue Jack” for
detailed information on operating the tongue jack.
10. Remove the wheel chocks from both sides of each of the
heater trailer’s wheels.
Figure 11
A
B
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Operating The Tongue Jack
The heater trailer is equipped with a tongue jack to support
the trailer tongue and to level the trailer front to rear.
To raise and lower the tongue jack:
1. To raise the tongue, turn the handle (A, Figure 12) clock-
wise to extend the jack.
2. To lower the tongue, turn the handle counter-clockwise to
retract the jack.
To position the tongue jack in the transport or trailer
support position:
1. Make sure the tongue is safely supported by appropriate
means.
2. Pull the tongue jack quick release pin (B, Figure 12) from
the locking hole so that the jack (C) can rotate.
WARNING
Removing the tongue jack quick-release pin from the lock-
ing hole without supporting the trailer tongue could cause
the tongue to fall to the ground resulting in death or serious
injury. Always make sure the trailer tongue is safely sup-
ported by appropriate means prior to removing the jack
quick-release pin.
3. Rotate the jack to the desired position. The jack can be
locked in 2 positions.
• Trailer support position – vertical with support pad
down (D, Figure 12).
• Transport position – horizontal with support pad rear-
ward (E).
4. Insert the tongue jack quick-release pin in the locking
hole.
WARNING
Failure to insert the tongue jack quick-release pin in the
locking hole could leave the tongue unsupported causing
it to fall to the ground resulting in death or serious injury.
Always make sure the tongue jack quick-release pin is
inserted in a locking hole before raising or lowering the
trailer tongue.
Figure 12
A
B
C
E
D
Using The Trailer Coupler
The heater trailer is equipped with a heavy duty SAE trailer
coupler rated for Gross Vehicle Weight Rating (GVWR) of
7,000 pounds (3,175 kg). This coupler complies with SAE
J684 and VESC V-5 standards.
To couple the trailer to the tow vehicle:
1. Make sure the coupler is open: Remove the pin (A,
Figure 13) from the latch (B) and lift the latch. Make sure
the coupler cap (D) is open and holds the collar (C) back.
2. Lower the trailer onto the hitch ball (E, Figure 13).
3. Visually check to make sure the hitch ball is fully seated
in the coupler.
4. Carefully close the coupler cap, then lower the latch. Be
sure the collar, which is spring loaded, springs toward the
ball socket and captures the coupler cap.
5. Reinsert the pin in the latch. Do not tow without the pin
in the latch.
6. Check that the coupler is securely attached to the ball
hitch.
To uncouple the trailer from the tow vehicle:
1. Remove the pin in the latch and lift the latch. Make sure
the coupler cap is open and holds the collar back.
2. Raise the trailer off of the hitch ball with the tongue jack.
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Figure 13
B
A
C
D
E
Using A Pintle Hook
The 3-inch (75mm) diameter lunette eye meets the require-
ments of SAE J847 for Gross Vehicle Weight Rating (GVWR)
of 6,000 pounds (2,722 kg). Couple the lunette eye to a pin-
tle hook meeting the requirements of SAE J847 for a GVWR
of not less than 6,000 pounds (2,722 kg).
When using the lunette eye with a pintle hook, follow the pin-
tle hook manufacturer’s instructions for coupling and locking
the lunette eye to the pintle hook, and uncoupling the lunette
eye from the pintle hook.
Break-Away Brake System
The heater trailer is equipped with electric brakes and a
break-away brake system. The break-away brake system
is designed to bring the heater trailer to a stop by activating
the electric brakes should the heater trailer become discon-
nected from the tow vehicle while moving.
The auxiliary power wire on the tow vehicle must be con-
nected and powered for this system to work.
The break-away brake system is not intended to be used as
a parking brake.
The break-away brake system consists of a break-away box
with 12 volt battery, a break-away brake switch, and a break-
away brake switch cable.
The break-away brake box is equipped with a battery test
button to check the battery condition. The battery should be
charged and tested before towing the trailer.
To check the break-away brake system:
WARNING
Towing the heater trailer when the break-away brake sys-
tem battery charge is low, or when the electric brakes are
not functioning properly could result in death or serious
injury should the heater trailer become disconnected from
the tow vehicle while moving. Always perform the break-
away brake system tests prior to towing the heater trailer.
Always repair the break-away brake system if the system is
not operating properly.
1. Before connecting the tow vehicle trailer lighting cable
to the heater trailer, push the “Test” button on the break-
away brake box. The green light indicates a charged bat-
tery, while a red light indicates that the battery charge is
low.
2. If the battery charge is low, recharge the battery before
towing the trailer. To recharge the battery, connect the
tow vehicle’s trailer lighting cable to the heater trailer. An
amber light indicates that the battery is charging.
3. With a fully charged battery, test the break-away brake
system. Pull firmly on the break-away brake switch cable
until the pin disconnects from the break-away brake
switch. The battery should activate the electric brakes.
To connect the break-away brake switch cable to the
tow vehicle:
1. Pull the pin (A, Figure 14) out of the break-away brake
switch (B).
NOTE: Image is representative, and may differ according
to model.
2. Locate the safety chain pocket on the tow vehicle that is
on the same side as the break-away brake switch. Do
not cross the break-away brake switch cable to the oppo-
site side safety chain pocket, as this could cause the
break-away brake switch to fail. Do not cross over the
hitch ball, as the cable may become disconnected as the
tow vehicle moves over rough roads.
3. Route the pin through the safety chain pocket (C, Figure
14), then through the break-away brake cable loop (D).
4. Re-insert the pin in the break-away brake switch.
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Figure 14
A
B
C
D
Heater Trailer Weight
WARNING
Towing the heater trailer when it is loaded beyond the
Gross Vehicle Weight Rating (GVWR) as stated on the
serial plate could result in death or serious injury. Always
maintain a GVWR less than the GVWR stated on the serial
plate.
The heater trailer is an SAE Class 4 trailer, with a Gross
Vehicle Weight Rating (GVWR) as stated on the serial plate
and in the “Specifications” section of this manual. Do not
exceed the GVWR by attempting to carry additional tools or
equipment.
Towing The Heater Trailer
WARNING
Excessive speed when towing the trailer could result in
death or serious injury. Always maintain a safe towing
speed for road conditions. Never exceed 55 MPH (90
km/h) when towing the heater trailer.
The rated maximum highway towing speed for the heater
trailer is 55 MPH (90 km/h). Be sure to check your state or
province laws regarding maximum legal towing speeds for
trailers.
When towing the heater trailer off-highway or on rougher
terrain, the maximum towing speed is 20 MPH (32 km/h).
Slower speeds may be required for very rough terrain.
The heater trailer is designed to be towed with the engine
and heater units shut down.
Disconnecting The Heater Trailer From
The Tow Vehicle
1. Select a firm, level and stable surface at the work site.
Follow all rules or instructions for your work site for locat-
ing the heater trailer.
2. Position the heater trailer with the tow vehicle so that the
left side of the trailer (heater outlet side) is toward the
area to be heated. Chock both sides of each wheel.
WARNING
Attempting to move or position the heater trailer by manu-
ally pushing or pulling it could present a crush hazard
resulting in death or serious injury. Always position the
heater trailer with the tow vehicle, chock the wheels and
lower the tongue jack before uncoupling the trailer from the
tow vehicle.
3. Disconnect the trailer lighting connector from the tow
vehicle’s connector.
4. Position the tongue jack in the trailer support position,
and lower the jack to support the tongue. Support the
trailer to allow the trailer coupler or pintle hook to be
disconnected from the tow vehicle. See “Operating The
Tongue Jack” for detailed information on operating the
tongue jack.
5. Disconnect the trailer coupler or pintle hook. See “Using
The Trailer Coupler” or “Using A Pintle Hook” for detailed
uncoupling information.
6. Use the tongue jack to raise the trailer coupler or lunette
eye above the tow vehicle’s hitch ball or pintle hook.
7. Disconnect the safety chains from the tow vehicle’s hitch
frame.
8. Disconnect the break-away brake cable from the tow
vehicle.
9. Move the tow vehicle clear of the heater trailer.
Transporting On A Trailer
The heater trailer is equipped with four tie down points.
There are two tie down loops at the front of the trailer located
on the trailer tongue. The spacers between the trailer chassis
and the rear “bumper” are used as tie down points at the rear.
Always secure the heater trailer with appropriate chains or
straps. Do not apply more than 600 pounds (272 kg) force
on the chains or straps.
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The truck operator is responsible for securing the load prop-
erly to his trailer.
Lifting The Heater Trailer
WARNING
Attempting to lift the heater trailer with a lifting device that
is underrated or damaged could result in death or serious
injury. Always make sure the lifting device is rated to lift
the weight of the heater trailer. Make sure that the lifting
device is not damaged and is in operable condition before
beginning the lift.
WARNING
Standing or walking under elevated equipment could
result in death or serious injury. When elevating or lifting
the heater trailer, always keep clear of the area around
and under the heater trailer, and do not allow others in the
area.
The heater trailer is equipped with two lifting eyes at the
top of the trailer. See Heater Trailer Weight for the weight of
the heater trailer. Each lifting eye is rated for 3,000 pounds
(1,361 kg). Use both lifting eyes when attempting to lift the
heater trailer. The lifting eyes are intended carry the weight
of the Maxi-Heat heater trailer only, and no additional weight.
The heater trailer is not intended to be suspended for long
periods of time.
The heater trailer is not equipped with forklift pockets. Do not
attempt to lift the heater trailer with a forklift.
Operation
Work Site Considerations
Prior to setting up and operating the heater trailer, the opera-
tor must determine where to place it on the work site. When
placing the heater trailer, consideration must be given to
ground conditions, proximity to combustible or flammable
material and ventilation.
It is the operator’s responsibility to ensure that the heater
trailer is properly and safely positioned on stable surface at
the work site. Be sure to follow rules or instructions for your
work site for locating the heater trailer.
Ground Conditions
The heater trailer must be placed on a firm stable surface
that will support the total weight of the trailer, and support the
force exerted on the ground at the tongue jack. The surface
should be level, but must not exceed a grade of 2.5% (1.4°
incline) in any direction. Grades greater than 2.5% may
cause the heater trailer to roll away. Always chock both sides
of each wheel prior to disconnecting the heater trailer from
the tow vehicle.
Proximity To Combustible Or Flammable
Material
The heater must be kept away from combustible or flam-
mable material. Maintain a distance of at least 8 feet (2.5
m) from the air outlet, and 5 feet (1.5 m) from the top and air
inlet side from any combustible or flammable material.
Carbon Monoxide Asphyxiation
WARNING
Operating the engine or the heater units in a non-ventilated
enclosed area could result in death or serious injury.
Always operate the engine and the heater units in a well
ventilated area.
The engine and the chimneys of the heater units exhaust car-
bon monoxide gas which can cause asphyxiation when the
engine or the heater units are run in an enclosed area. Make
sure that the heater trailer is in a well ventilated area before
starting the engine or operating the heater units.
Carbon monoxide gas is not present at the heater outlet. The
combustion chamber of the heater unit is separate from the
heated air passing over it to the heater outlet. Occasionally,
the odor of diesel fuel may be present with the heated air
at the outlet. This does not indicate the presence of carbon
monoxide gas.
Using The Ground Rod
The heater trailer is equipped with a earth grounding system.
This system consists of a ground rod, a grounding cable and
a ground lug on the outside of the heater trailer. The ground
rod is a safety device that reduces the chance of personal
injury from stray electrical currents. Therefore, Allmand rec-
ommends using the ground rod whenever the heater trailer is
in use. It is the user’s responsibility to determine the require-
ments and / or applicability of national, state or province and
local electrical code, which governs the use of the ground
rod.
To install the ground rod:
1. Open the rear engine cover door and secure with the
door cover holders. The ground rod with grounding cable
is stored on the left side of the trailer to the left of the fuel
tank.
2. Unwind the grounding cable from the ground rod. Leave
the grounding cable securely attached to the ground rod.
3. Find the ground lug at the left rear of the trailer chassis.
See Figure 15. Locate a point on the ground not more
than 5 feet (1.5 m) from the ground lug. Drive the ground
rod into the earth at this point.
4. Remove the wing nut from the ground lug, and attach the
grounding cable to the ground lug. Secure with the wing
nut.
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To remove the ground rod:
1. Remove the grounding cable from the ground lug by
removing the wing nut. Re-install the wing nut on the
ground lug.
2. Remove the ground rod from the earth. Be careful not to
damage the grounding cable when removing the ground
rod.
3. Wind the grounding cable around the ground rod. Place
the ground rod in its storage tube inside the engine com-
partment.
Figure 15
Fueling The Heater Trailer
WARNING
Attempting to fuel the heater trailer with the engine or heat-
er units running could cause fire resulting in death or seri-
ous injury. Always make sure the engine and heater units
are shut down before adding fuel to the fuel tanks.
The heater trailer is equipped with a single fuel tank, which
supplies the engine and the two heater units. The single wall
tank has a capacity of 190 gallons (719 L), and the double
wall tank has a capacity of 175 gallons (662 L).
The fuel tank cap (A, Figure 16) is located on top of the
heater trailer.
Fill the fuel tank with No. 1 Ultra Low Sulfur Diesel (ULSD).
NOTICE
Using engine fuels other than recommended could cause
damage to your engine or its emission control system result-
ing in voiding the engine manufacturer’s warranty. Always
read and follow the engine manufacturer’s fuel recommenda-
tions.
Figure 16
A
Locking Fuel Cap
When equipped with a single wall single fuel tank, the fuel
cap is fitted with a tang with a hole for a pad lock (not includ-
ed).
When equipped with a double wall single fuel tank, the fuel
cap is vented and fitted with a key slot.
When equipped with three fuel tanks, the standard fuel caps
are not lockable. Optional locking fuel caps are available.
To lock or unlock a locking fuel cap:
1. Inset the key in the key slot.
2. To unlock the fuel cap, hold the cap to prevent it from
rotating freely, while turning the key counter-clockwise.
Once unlocked, remove the fuel cap.
3. To lock the fuel cap, screw the cap onto the filler neck.
Turn the key clockwise to lock the cap.
Preparing To Operate The Heater Trailer
1. Place wheel chocks on both sides of each wheel.
2. Level the heater trailer front to back with the tongue jack.
See “Operating The Tongue Jack” in the Transporting
section.
3. Open the rear engine cover door and secure with the
door cover holders. Check the following:
a. Remove the dipstick from the engine and check the
engine oil level. Maintain engine oil level between the
“Full” and “Add” marks on the dipstick. Add as need-
ed. See “Engine Oil” in the Maintenance section.
b. Check the engine coolant recovery bottle. Keep
engine coolant in the recovery bottle at least 1/3 full.
Remove the radiator cap and check the coolant level.
Add as needed. See ‘Engine Coolant’ in Maintenance
section.
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WARNING
Rapid release of hot coolant under pressure could result in
death or serious injury. Use extreme caution when open-
ing the radiator cap, and always wear eye protection and
heat resistant gloves.
c. Open the cover of the electrical box on the left side of
the engine compartment. Make sure that both heater
unit circuit breakers are in the ON position. Close and
latch the electrical box cover.
4. Check the fuel level in the fuel tank(s) and add as need-
ed.
a. Open the rear engine cover door and secure with the
door cover holders.
b. For heater trailers equipped with a single wall single
fuel tank, check the mechanical fuel gauge built into
the back wall of the fuel tank on the lower left.
c. For heater trailers equipped with either a double-wall
single fuel tank or three individual fuel tanks, turn the
ignition key to the RUN position. Check the level in
the fuel tank(s) with the fuel gauge mounted on the
engine control panel. The engine control panel is at
the lower left of the engine compartment opening.
5. Check to make sure the heater unit fuel shut-off valves
are open. Open the right side heating unit control access
door, and locate the fuel shut-off valves at the bottom of
the opening. To open the valve (allow fuel flow), move
the handle in-line with the fuel valve body. To close the
valve (shut off fuel flow) move the handle perpendicular
to the fuel valve body.
6. Open the left side heater unit outlet access door.
Determine what size ducting is required and install the
appropriate flexible ducting on the heater outlets. See
Installing The Flexible Ducting for installation instructions.
NOTE: Heater unit outlet access door must be open for
heater unit to operate.
Installing The Flexible Ducting
The heater trailer can be equipped with different size heater
unit outlets. The options for each heater unit include:
• Double 12 inch (305 mm) diameter outlets.
• Single 16 inch (406 mm) diameter outlet.
• Single 20 inch (408 mm) diameter outlet.
Flexible ducting of the same size is available from Allmand.
All sizes of outlets can accommodate both the adjustable
strap and clamp style and slip-lock style flexible ducting.
To use adjustable strap and clamp style ducting:
1. Install the cuff of the flexible ducting with strap and clamp
(A, Figure 17) over the heater unit outlet ring. Make sure
that the cuff, strap and clamp are beyond the bead on the
outlet ring (B).
2. Tighten the cuff over the outlet ring by pulling on the
loose end of the strap (C).
3. To remove the flexible ducting, loosen the clamp and pull
the cuff of the flexible ducting from the outlet ring.
Connecting rings for the slip-lock style of flexible ducting are
available from Allmand. A connecting band must be used to
slip inside the heater unit outlet ring. The connecting band
has three lock pins which engage in the “J” slots of the outlet
ring.
Figure 17
B
A
C
To use the slip-lock style flexible ducting:
1. Install the flexible ducting (A, Figure 18) over the con-
necting band (B). The flexible ducting should cover only
half of the connecting band (inset), allowing the lock pins
and arrows to be visible on the remaining half. Secure
using a large screw type band clamp (C).
2. To attach the slip-lock flexible duct, align a lock pin and
arrow of the connecting band (B, Figure 19) with a “J” slot
in the outlet ring (D). Slip the connecting band inside
the outlet ring as deep as it will go. Twist the connecting
band counter-clockwise to the end of the “J” slot, then
pull back to lock.
3. To remove the slip-lock flexible duct, push the connecting
band in and twist clockwise to the end of the “J” slot, then
pull the connecting band off the outlet ring.
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