Enerco MH125FAV User Manual

Model #

OPERATING INSTRUCTIONS
AND OWNER’S MANUAL

READ INSTRUCTIONS CAREFULLY: Read and follow all instructions. Place instructions in a safe

place for future reference. Do not allow anyone who has not read these instructions to assemble,
light, adjust or operate the heater.

MH55FAV
MH85FAV
MH125FAV

FORCED AIR PROPANE
CONSTRUCTION HEATER

WARNING:

— Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any

other appliance.

— An LP cylinder not connected for use shall not be stored in the vicinity of this or any other appli-

ance.

— WHAT TO DO IF YOU SMELL GAS

• Do not try to light appliance.

• Extinguish any open flame.

• Shut off gas to appliance.

— Service must be performed by a qualified service agency.

This is an unvented gas-fired portable heater. It uses air (oxygen) from the area in which it is used.
Adequate combustion and ventilation air must be provided. Refer to page 3.

If the information in this manual is not followed exactly, a fire or explo­sion may result causing property damage, personal injury or loss of life.

05/03 Revision L1 #70056MR. HEATER INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-881-5500

WARNING:

YOUR SAFETY IS IMPORTANT TO YOU AND TO OTHERS,
SO PLEASE READ THESE INSTRUCTIONS BEFORE YOU

OPERATE THIS HEATER.

GENERAL HAZARD WARNING:

FAILURE TO COMPLY WITH THE PRECAUTIONS AND
INSTRUCTIONS PROVIDED WITH THIS HEATER, CAN

RESULT IN DEATH, SERIOUS BODILY INJURY AND
PROPERTY LOSS OR DAMAGE FROM HAZARDS OF FIRE,
EXPLOSION, BURN, ASPHYXIATION, CARBON MONOX­IDE POISONING, AND/OR ELECTRICAL SHOCK.

ONLY PERSONS WHO CAN UNDERSTAND AND FOLLOW

THE INSTRUCTIONS SHOULD USE OR SERVICE THIS
HEATER.

IF YOU NEED ASSISTANCE OR HEATER INFORMATION
SUCH AS AN INSTRUCTIONS MANUAL, LABELS, ETC.

CONTACT THE MANUFACTURER.

WARNING:

NOT FOR HOME OR RECREATIONAL VEHICLE USE

WARNING:

FIRE, BURN, INHALATION, AND EXPLOSION HAZARD.
KEEP SOLID COMBUSTIBLES, SUCH AS BUILDING

MATERIALS, PAPER OR CARDBOARD, A SAFE DIS­TANCE AWAY FROM THE HEATER AS RECOMMENDED
BY THE INSTRUCTIONS NEVER USE THE HEATER IN
SPACES WHICH DO OR MAY CONTAIN VOLATILE OR
AIRBORNE COMBUSTIBLES, OR PRODUCTS SUCH AS
GASOLINE, SOLVENTS, PAINT THINNER, DUST PAR­TICLES OR UNKNOWN CHEMICALS.

WARNING:

The State of California requires the following warning:

COMBUSTION BY-PRODUCTS PRODUCED WHEN
USING THIS PRODUCT CONTAIN CARBON MONOXIDE,
A CHEMICAL KNOWN TO THE STATE OF CALIFORNIA
TO CAUSE CANCER AND BIRTH DEFECTS (OR OTHER
REPRODUCTIVE HARM).

CONTENTS

HEATER SPECIFICATIONS .......................................................... 2

WARNINGS ............................................................................... 2

OPERATING PRECAUTIONS ....................................................... 3

SAFETY PRECAUTIONS .............................................................. 4

ODOR FADE WARNING ............................................................. 5

OPERATING INSTRUCTIONS ...................................................... 6

SERVICING ................................................................................ 6

SIZE AND CAPACITY OF PROPANE CYLINDERS REQUIRED ........ 7

WIRING DIAGRAMS.................................................................. 8

55FAV PARTS ............................................................................. 9

85FAV PARTS ............................................................................10

125FAV PARTS .......................................................................... 11

WARRANTY ............................................................................. 12

SPECIFICATIONS

Type of Gas: ............... For use with Propane Only

Gas Supply Pressure

to regulator.............. Max.: Bottle Pressure

regulator out ........... 28" W.C. (6.97 kPa)

Min.: 5 psig (34.5 kPa)

Electrical Input: ..........115V, 60 Hz, 1Ø, 3a

Min. Operating Voltage: 100V

Ignition: .....................Direct Spark

Primary

Flame Control: ......... Thermocouple Operated Gas Valve

High Temperature

Control: .................... 240°F (116°C)

Min. Ambient Temp. Rating 0°F (-17.8°C)

Mr. Heater | Forced Air Propane Construction Heater Operating Instructions and Owner’s Manual

2

SPECIFICATIONS

Model: ............................... MH55FAV ......................... MH85FAV........................... MH125FAV

Rating: .............................. 30,000-55,000 .................. 50,000 – 85,000 ................. 75,000 – 125,000

Btu/Hr Btu/hr Btu/hr
(8.8-16.1 kW) (14.6 – 25.0 kW) (21.9 – 36.6 kW)

Fuel Consumption: .............. 1.4-2.5 #/hr ...................... 2.3 – 3.9 #/hr ..................... 3.5 – 5.8 #/hr

(.64-1.1 kg/hr) (1.04 – 1.77 kg/hr) (1.59 – 2.63 kg/hr)

Fuel Orifice Port No.: .......... 18 ..................................... 18 ....................................... 18

Fuel Orifice Port Size: .......... 0.0196" .............................. 0.0240” ............................... 0.0295"

(0.50mm) (0.6024mm) (0.75mm)

Heated Air Output: ............. 300 cfm ............................ 350 cfm .............................. 350 cfm

(8.49 cmm) (9.91 cmm) (9.91 cmm)

Average Air Temp. Rise: ...... 200°F (111°C) .................... 200°F (111°C) ...................... 400°F (232°C)

OPERATING PRECAUTIONS

This is a propane, direct-fired, forced air heater. It's intended use
is primarily temporary heating of buildings under construction,
alteration or repair.

Propane is heavier than air. If propane leaks from a connection
or fitting, it sinks to the floor, collecting there with the
surrounding air, forming a potentially explosive mixture.
Obviously, propane leaks should be avoided, so set up the
propane supply with utmost care. Read enclosed Odor Fade and
Propane Sheet for additional information about detecting
propane leaks. Leak check new connections or reconnections
with a soap and water solution and follow all connection
instructions herein. Also, ask your propane dealer for advice on
the propane application and supply installation and ask him to
check it if there are any questions.

This heater was designed and certified for use as a construction
heater in accordance with ANSI Standard Z83.7/CGA 2.14-2000.
Check with your local fire safety authority if you have any
questions about your applications. Other standards govern the
use of fuel gases and heat producting products in specific
applications. Your local authority can advise you about these.

Direct-Fired means that all of the combustion products enter the
heated space. Even though this heater operates very close to 100
percent combustion efficiency, it still produces small amounts of
carbon monoxide. Carbon monoxide (called CO) is toxic. We can
tolerate small amounts but not a lot. CO can build up in a heated
space and failure to provide adequate ventilation could result in
death. The symptoms of inadequate ventilation are:

• headache

• dizziness

• burning eyes and nose

• nausea

• dry mouth or sore throat

So, be sure to follow advice about ventilation in these operating
instructions.

Forced Air means that a blower or fan pushes the air through
the heater. Proper combustion depends upon this air flow;
therefore, the heater must not be revised, modified or operated

with parts removed or missing. Likewise, safety systems must not
be circumvented or modified in order to operate the heater.

When the heater is to be operated in the presence of other
people the user is responsible for properly acquainting those
present with the safety precautions and instructions, and of the
hazards involved.

Operating Instructions and Owner’s ManualMr. Heater | Forced Air Propane Construction Heater

3

SAFETY PRECAUTIONS

1. Check the heater thoroughly for damage. DO NOT operate a
damaged heater.

2. DO NOT modify the heater or operate a heater which has
been modified from its original condition.

3. Use only propane gas.

4. Use only VAPOR WITHDRAWAL propane supply. If there is any
question about vapor withdrawal, ask your propane dealer.

5. Mount the propane cylinders vertically (shutoff valve up).
Secure them from falling or being knocked over and protect
them from damage.

6. Locate propane containers at least (USA) 7 ft. (2.13m),
(Canada) 10 ft. (3m) from the heater and do not direct
exhaust toward containers.

7. IMPORTANT Use only the hose and regulator assembly
provided with the heater. Match the color stripe on the
hangtag attached to the hose assembly with the color on the
label located near the propane inlet fitting on the heater.
Inspect hose assembly before each use of the heater. If there
is excessive abrasion or wear, or hose is cut, replace with
hose assembly listed on parts list before using heater.

8. For indoor use only. Area must be well ventilated. Figure 1.
(also see "Operating Precautions").

9. If at any time gas odor is detected, IMMEDIATELY
DISCONTINUE operation until the source of gas has been
located and corrected. Read enclosed Odor fade and Propane
Sheet for additional information about detecting propane
leaks.

10. Install the heater such that is is not directly exposed to water
spray, rain and/or dripping water.

11. Maintain minimum clearance from normal combustible
material (like paper). Figure 2.

12. Due to the high surface and exhaust temperatures, adults
and children must observe clearances to avoid burns or
clothing ignition.

13. Operate only on a stable, level surface.

14. Do not use with ductwork. Do not restrict inlet or exit.

15. Use only the electrical power specified. The electrical
connection and grounding must comply with National
Electrical Code - ANSI/NFPA 70 (USA) and CSA C22.1
Canadian Electrical Code, Part 1 (Canada).

16. Use only a properly grounded 3-prong receptacle or extension
cord.

17. Do not move, handle or service while hot or burning.

18. Use only in accordance with local codes or, in the absence of
local codes, with the Standard for the Storage and Handling
of Liquefied Petroleum Gases ANSI/NFPA 58 and CSA B149.1,
Natural Gas and Propane Installation Code.

Figure 1

VENTILATION: Minimum openings required

Opening Opening

Heater near floor near ceiling

Forced air (55) ..................... 1 ft

Forced air (85, 125) ............. 2 ft

2

............................................

2

............................................

1 ft

2 ft

2

2

Figure 2

MINIMUM CLEARANCE: From normal combustible material

Clearance 55, 85, 125 Forced Air

From floor .......................................... 0 ft

From outlet ........................................ 6 ft

From sides.......................................... 2 ft

From top ............................................ 3 ft

Locate 10 ft. from canvas or plastic tarpaulins or similar
coverings and secure them to prevent flapping or movement
due to wind action.

Mr. Heater | Forced Air Propane Construction Heater Operating Instructions and Owner’s Manual

4

ODOR FADE WARNING

WARNING

Asphyxiation Hazard

• Do not use this heater for heating human living
quarters.

• Do not use in unventilated areas.

• The flow of combustion and ventilation air must
not be obstructed.

• Proper ventilation air must be provided to
support the combustion air requirements of the
heater being used.

• Refer to the specification section of the heater’s
manual, heater dataplate, or contact the factory
to determine combustion air ventilation
requirements of the heater.

• Lack of proper ventilation air will lead to
improper combustion.

• Improper combustion can lead to carbon
monoxide poisoning leading to serious injury or
death. Symptom of carbon monoxide poisoning
can include headaches dizziness and difficulty in
breathing.

ODOR FADING - NO ODOR DETECTED

• Some people cannot smell well. Some people cannot
smell the odor of the man-made chemical added to
propane (LP) or natural gas. You must determine if you
can smell the odorant in these fuel gases.

• Learn to recognize the odor of propane (LP) gas and
natural gas. Local propane (LP) gas dealers will be more
than happy to give you a scratch and sniff pamphlet.
Use it to become familiar with the fuel gas odor.

• Smoking can decrease your ability to smell. Being
around an odor for a period of time can affect your
sensitivity to that particular odor. Odors present in
animal confinement buildings can mask fuel gas odor.

• The odorant in propane (LP) gas and natural gas is

colorless and the intensity of its odor can fade
under some circumstances.

• If there is an underground leak, the movement of gas
through the soil can filter the odorant.

• Propane (LP) gas odor may differ in intensity at different
levels. Since Propane (LP) gas is heavier than air, there
may be more odor at lower levels.

• Always be sensitive to the slightest gas odor. If you
continue to detect any gas odor, no matter how small,
treat it as a serious leak. Immediately go into action as
discussed previously.

FUEL GAS ODOR

LP gas and natural gas have man-made odorants
added specifically for detection of fuel gas leaks.
If a gas leak occurs you should be able to smell the fuel
gas. Since Propane (LP) is heavier than air you should
smell for the gas odor low to the floor. ANY GAS
ODOR IS YOUR SIGNAL TO GO INTO IMMEDIATE
ACTION!

• Do not take any action that could ignite the fuel gas. Do
not operate any electrical switches. Do not pull any
power supply or extension cords. Do not light matches
or any other source of flame. Do not use your
telephone.

• Get everyone out of the building and away from the
area immediately.

• Close all propane (LP) gas tank or cylinder fuel supply
valves, or the main fuel supply valve located at the
meter if you use natural gas.

• Propane (LP) gas is heavier than air and may settle in
low areas. When you have reason to suspect a propane
leak, keep out of all low areas.

• Use your neighbor’s phone and call your fuel gas
supplier and your fire department. Do not re-enter the
building or area.

• Stay out of the building and away from the area until
declared safe by the firefighters and your fuel gas
supplier.

• FINALLY, let the fuel gas service person and the
firefighters check for escaped gas. Have them air out
the building and area before you return. Properly trained
service people must repair any leaks, check for further
leakages, and then relight the appliance for you.

ATTENTION - CRITICAL POINTS TO
REMEMBER!

• Propane (LP) gas has a distinctive odor. Learn to
recognize these odors. (Reference Fuel Gas Odor and
Odor Fading sections above.

• Even If you are not property trained in the service and
repair of the heater, ALWAYS be consciously aware of
the odors of propane (LP) gas and natural gas.

• If you have not been properly trained in repair and
service of propane (LP) gas then do not attempt to light
heater, perform service or repairs, or make any
adjustments to the heater on the propane (LP) gas fuel
system.

• A periodic sniff test around the heater or at the heater’s
joints; i.e. hose, connections, etc., is a good safety
practice under any conditions. If you smell even a small
amount of gas, CONTACT YOUR FUEL GAS SUPPLIER
IMMEDIATELY. DO NOT WAIT!

Operating Instructions and Owner’s ManualMr. Heater | Forced Air Propane Construction Heater

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OPERATING INSTRUCTIONS

SERVICING

PREPARING FOR OPERATION

1. Check the heater for possible shipping damage. If any is
found, immediately notify the factory.

2. Follow all of the "Precautions".

3. Connect the POL fitting of hose and regulator assembly to
the propane cylinder by rotating the POL nut
counterclockwise into the propane cylinder's valve outlet and
securely tighten with a wrench.

4. Connect the hose to the heater by rotating the hose fitting
clockwise.

5. Securely tighten all gas connections.

6. Open the cylinder's gas valve and check all gas connections
with a soap and water solution. DO NOT USE A FLAME.

7. Connect power cord to well-grounded 115V, 60 Hz, 1Ø source
of power.

8. When using an extension cord, make certain that it is a 3­wire (grounded) cord of proper wire size.

START

1. Before heater ignition, always allow heater fan (blower) to
run for 20 seconds to purge fuel.

2. Slowly open the main valve at propane cylinder.

3. Depress the fuel valve button to light the MH55FAV,
MH85FAV and MH125FAV models.

4. After the heater lights, keep the gas valve button depressed
for 15 seconds then release and the heater will continue to
operate.

5. Adjust burn rate with ball valve to desired setting

A hazardous condition may result if a heater is used that has been
modified or is not functioning properly. When the heater is
working properly:

• The flame is contained within the heater.

• The flame is essentially blue with perhaps some yellow
tipping.

• There is no strong disagreeable odor, eye burning or other
physical discomfort.

• There is no smoke or soot internal or external to the heater.

• There are no unplanned or unexplained shut downs of the
heater.

The parts lists and wiring diagram show the heater as it was
constructed. Do not use a heater which is different from that
shown. In this regard, use only the hose, regulator and cylinder
connection fitting (called a POL fitting) supplied with the heater.
IMPORTANT Match the color stripe on the hangtag attached to
the hose assembly with the color on the label located near the
propane inlet fitting on the heater. Do not use alternates. For this
heater, the regulator must be set as shown in "specifications". If
there is any uncertainty about the regulator setting, have it
checked.

A heater which is not working right must be repaired, but only by
a trained, experienced service person.

In-warranty products will be repaired with no charge for either
parts or labor. Please include a brief statement indicating date,
place of purchase, the nature of the problem and proof of
purchase.

Out-of-warrranty products will be repaired with a charge for parts
and labor.

STOP

1. Securely close valve on the propane cylinder.

2. Continue to operate heater until all fuel in the hose has burned.

3. Unplug the power cord.

RESTART AFTER SAFETY SHUTDOWN

1. Securely close valve at propane cylinder. Unplug heater.

2. Wait 5 minutes.

3. Restart following "Start" procedure.

MAINTENANCE AND STORAGE

1. The heater should be inspected before each use, and at least
annually by a qualified person.

2. Before each use, check the soft "O" ring seat at the bullnose
of the POL fitting. If the "O" ring is cut, scuffed, or otherwise
damaged, replace it with part number 6681.

3. Turn off the gas at the LP-gas supply cylinder(s) when the
heater is not in use.

4. When the heater is to be stored indoors, the connection
between the LP-gas supply cylinder(s) and the heater must be
disconnected and the cylinder(s) removed from the heater
and stored out of doors and in accordance with Chapter 5 of
the standard for Storage and Handling of Liquefied Petroleum
Gases ANSI/NFPA 58 and CSA B149.1, Natural Gas and
Propane Installation Code.

Mr. Heater | Forced Air Propane Construction Heater Operating Instructions and Owner’s Manual

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SIZE AND CAPACITY OF PROPANE
CYLINDERS REQUIRED

The charts below show the approximate size of the cylinder
required for these heaters. To use the chart:

1. Select the lowest air temperature expected (at the bottom of

the chart).

2. Move straight up to time of operation desired (left side of

chart).

3. Read the cylinder size required.

All heaters should have:

full cylinders
good air circulation
no frost on cylinders

55,000 BTU/HR (16.1 kW)

MAXIMUM OPERATING TIME - HOURS

AIR TEMPERATURE -

o

85,000 BTU/HR (33.4 kW)

F (oC)

125,000 BTU/HR (49.1 kW)

MAXIMUM OPERATING TIME - HOURS

AIR TEMPERATURE -

o

F (oC)

Use liquid

withdrawal

and a vaporizer

MAXIMUM OPERATING TIME - HOURS

AIR TEMPERATURE -

o

F (oC)

Operating Instructions and Owner’s ManualMr. Heater | Forced Air Propane Construction Heater

7

WIRING DIAGRAMS

COLOR CODE

BLACK

R

BLUE

Y

WHITE

O

GREEN

LINE CORD

RED
YEL

ORG

THERMOCOUPLE

RELAY

B

W

G

LEGEND
FEMALE CONN.
RING CONN.

TERMINAL BOARD

CONNECTION DIAGRAM

W

B

W

SCHEMATIC DIAGRAM

B

MOTOR

B

B

B

R* or Y*

R* or Y*

NOTE:

IGNITOR

I1

I2

HIGH-LIMIT SWITCH

SPARK PLUG

B** or O**

MOTOR

115V
60HZ

IF ANY ORIGINAL WIRING AS SUPPLIED WITH THE HEATER MUST BE REPLACED, IT MUS BE REPLACED WITH
TYPE AWG 105° C WIRE OR ITS EQUIVALENT EXCEPT AS INDICATED (*TYPE SF 2-200, **SGI-250°C)

SPARK PLUG

I1

IGNITOR

I2

HIGH-LIMIT SWITCH

THERMOCOUPLE

RELAY

GAS

VALV E

WIRING CHART

MH55FAV, MH85FAV, MH125FAV

Part # Color Length From To

1040 Black 6" (152mm) I1 (Ignitor) T.B. Line

1070 Orange 11" (279mm) 1 (Ignitor Spark Plug

1041 White 4 1/2" (114mm) I2(Ignitor) T.B. Return

1044 Yellow 16" (406mm) High Limit T.B. Middle

1044 Yellow 16" (406mm) High Limit T.B. Line

1441 Black 5" ((127mm) Relay T.B. Middle

1442 White 5" (127mm) Relay T.B. Return

1806 Orange 6" (152mm) Relay Thermocouple Junction Block

1806 Orange 6" (152mm) Relay Thermocouple Junction Block

Mr. Heater | Forced Air Propane Construction Heater Operating Instructions and Owner’s Manual

8

Mr. Heater • Forced Air Propane Construction Heater • Model #MH55FAV

REF. # ITEM # DESCRIPTION QTY.

1 6152 Hose Assy, LP 1
2 6257 Regulator 28" WC 1
3 6433 POL Excess Flow 1/4 MPT 1
4 3955 Panel, Bottom 1
5 1036 Power Cord Assy 1
6 6223 Strain Relief Bushing 1
7 1904 Control Box Assy 1
8 3275 Ignitor HYLO 801 1
9 6127 Ftg, Male Connector 1
10 6133 Ftg, Coupling 2
11 6265 Ftg, Elbow Street 2
12 7285 Thermoelectric Valve 1
13 6641 Terminal Board 1
14 7431 Ball Valve 1
* 6189 Terminal “Y” 2
16 1811 Relay Assembly 1
17 3141 Ftg., Female Connector 1
18 1935 Fuel Tube Assy 1
19 1654 Motor Grille Assy 1
20 3676 Brkt, Motor Mounting 1
21 1652 Motor Assy 1
22 6086 Fan, 7" 1
23 1729 Outer Cylinder Assy 1
24 7094 Clip Handle Mounting 2

REF. # ITEM # DESCRIPTION QTY.

25 7095 Handle 1
26 6225 Snap Bushing, 5/8 1
27 6226 Universal Bushing 1
28 6224 Snap Bushing, 1/2 1
29 6654 Thermocouple 13" Lg w/J.B. 1
30 1082 Spark Plug 1
31 3037 Spark Plug Nut 2
32 6121 Ftg, Male Elbow 1
33 3038 Orifice Nut Mtg 1
34 1751 High Limit Control Assy 1
35 1930 Orifice Assy, LP 1
36 1651 Middle Cylinder Assy 1
37 1931 Flame Holder Assy 1
* 70056 Manual, Operating Instructions 1
* M8733 Label, Model 1
* 7783 Label, Operating Instructions 1
* 6374 Label, Electrical Grounding 1
* 7651 Label, Fuel 1
* 7503 Label, Wiring Diagram 1
* 6373 Label, Fan Rotation 1
* 1667 Hose & Regulator Assembly 1
* 8203 Label Hang Tag, LP 1
* 7709 Label, Fuel 1
* 7704 Label, Warning 1

*Not shown on exploded view

Operating Instructions and Owner’s ManualMr. Heater | Forced Air Propane Construction Heater

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Mr. Heater • Forced Air Propane Construction Heater • Model #MH85FAV

REF. # ITEM # DESCRIPTION QTY.

1 1670 Cylinder, Outer Assembly 1
2 6086 Fan, 7 inch 1
3 1551 Motor Assembly, 80-FAS 1
4 1671 Grille, Motor Mtg./Inlet Assy. 85 1
5 1750 Flame Holder Assembly 1
6 1674 Cylinder, Middle Assembly 1
7 3038 Nut, Orifice Mounting 3/4-16 1
8 7433 Fitting, Male Elbow 1
9 6654 Thermocouple 1
10 1751 High Limit Control Assembly 1
11 1083 Spark Plug, 1/8 Gap 1
12 3037 Nut-Spark Plug 3
13 1673 Orifice Assembly 1
14 1752A Control Box Assembly 1
15 3044 Ignition Relay Bracket 1
16 6641 Terminal Board 1
17 3275 Spark Ignition, 115V 1
18 1668 Fuel Tube Assembly 1
19 6133 Fitting, Coupling 1
20 3787 Spacer, TC Bracket 1
21 6127 Fitting, Male Connector 1
22 7285 TE Valve 1
23 7404 Ball Valve, Variable Rate 1

Mr. Heater | Forced Air Propane Construction Heater Operating Instructions and Owner’s Manual

REF. # ITEM # DESCRIPTION QTY.

24 7405 Fitting, Female Connector 1
25 3690 Control Panel Assembly 1
26 6223 Strain Relief Bushing 1
27 1036 Power Cord 1
28 6152 Hose Assembly 1
29 6257 Regulator, 28" W.C. 1
30 6433 POL Excess Flow 1
31 7094 Clip Handle Mounting, 3 pcs. 2
32 7095 Handle, 3 pcs 1
33 1811 Relay 1
35 7503 Label, Wiring 1
36 6265 Fitting, Elbow 2
37 3036 Bracket, TC 1
38 3775 Side Panel 1
* 70056 Manual, Operating Instructions 1
* M8507 Label, Model 1
* 8508 Label, Operating Instructions 1
* 7432 Label, BTU Rating 2
* 6374 Label, Electrical Grounding 1
* 7709 Label, Fuel Ignition 1
* 8203 Label, Hang Tag, LP 1
* 7704 Label, Warning 1
* 6373 Label, Fan 1

* Item not shown on exploded view

10

Mr. Heater • Forced Air Propane Construction Heater • Model #MH125FAV

REF. # ITEM # DESCRIPTION QTY.

1 1671 Grille Assembly 1
2 1551 Motor Assembly 1
3 7898 Fan, 8" 1
4 1998 Cylinder, Outer Shell Assembly 1
5 7095 Handle 1
6 7094 Clip Handle Mounting 2
7 7433 Fitting, Male Elbow 1
8 1083 Spark Plug, 1/8 Gap 1
9 2003 Control, High Limit Switch Assy. 1
10 3036 Bracket, Thermocouple 1
11 3787 Spacer, Thermocouple 1
12 2002 Orifice, LP Assembly 1
13 2001 Cylinder, Middle Assembly 1
14 3037 Nut, Spark Plug 3
15 2004 Flame Holder Assembly 1
16 3038 Nut, Orifice Mounting 1
17 1668 Fuel Tube Assembly 1
18 6654 Thermocouple 1
19 3044 Bracket Ignition Relay 1
20 6641 Terminal Board 1
21 6065 Spacer, Steel 1
22 1811 Relay Assembly 1
23 3275 Ignitor, Hi-Lo 801 Mini 1
24 6079 Spacer, PC Standoff Nylon 3
25 6265 Fitting, Elbow Street 2
26 7897 Ball Valve, Variable Rate 1

REF. # ITEM # DESCRIPTION QTY.

27 7405 Fitting, Female Connector 1
28 6227 Snap Bushing, 1 1/4 Nylon 1
29 7158 Snap Bushing, 3/4 Nylon 1
30 6133 Fitting, Coupling 1
31 6127 Fitting, Male Connector 1
32 7285 Valve, Thermoelectric 1
33 6223 Bushing, Strain Relief 1
34 1036 Power Cord 1
35 6433 POL Excess Flow 1/4 MPT 1
36 6257 Regulator, 28" W.C. 1
37 6152 Hose Assembly, LP 2
38 4019 Bottom Control Box 1
39 7843 Washer, Flat 1
40 2005 Control Box Assembly 1
* 6374 Label, Electrical Ground 1
* 6373 Label, Fan 1
* 8784 Label, Operating Instructions 1
* 7709 Label, Ignition/Fuel 1
* 8371 Label, BTU Rating 2
* 7503 Label, Wiring 1
* M8510 Label, Model 1
* 70056 Manual, Operating Instructions 1
* 8203 Label, Hang Tag, LP 1
* 7704 Label, Warning 1

* Item not shown on exploded view

Operating Instructions and Owner’s ManualMr. Heater | Forced Air Propane Construction Heater

11

Model #

OPERATING INSTRUCTIONS

MH55FAV
MH85FAV

AND OWNER’S MANUAL

MH125FAV

WARNING:

USE ONLY MANUFACTURER’S REPLACEMENT PARTS. USE OF ANY OTHER PARTS
COULD CAUSE INJURY OR DEATH. REPLACEMENT PARTS ARE ONLY AVAILABLE
DIRECT FROM THE FACTORY AND MUST BE INSTALLED BY A QUALIFIED SERVICE
AGENCY. MR. HEATER HOSES F273701 AND F273702 ARE SPECIFICALLY DESIGNED
FOR USE WITH THIS HEATER. USE OF OTHER HOSES MAY CAUSE THE HEATER TO
BECOME INOPERABLE.

PARTS ORDERING INFORMATION:

PURCHASING: Accessories may be purchased at any Mr. Heater local dealer or

direct from the factory

FOR INFORMATION REGARDING SERVICE

Please call Toll-Free 800-251-0001 • www.mrheater.com
Our office hours are 8:30 AM – 5:00 PM, EST, Monday through Friday.
Please include the model number, date of purchase, and description of problem in
all communication.

LIMITED WARRANTY

The company warrants this product to be free from imperfections in material or
workmanship, under normal and proper use in accordance with instructions of The
Company, for a period of one year from the date of delivery to the buyer. The Company, at
its option, will repair or replace products returned by the buyer to the factory,
transportation prepaid within said one year period and found by the Company to have
imperfections in material or workmanship.

If a part is damaged or missing, call our Technical Support Department at 800-251-0001.

Address any Warranty Claims to the Service Department, MR. HEATER INC., 4560 W. 160TH
ST., CLEVELAND, OHIO 44135. Include your name, address and telephone number and
include details concerning the claim. Also, supply us with the purchase date and the name
and address of the dealer from whom you purchased our product.

The foregoing is the full extent of the responsibility of the Company. There are no other
warranties, express or implied. Specifically there is no warranty of fitness for a particular
purpose and there is no warranty of merchantability. In no event shall the Company be
liable for delay caused by imperfections, for consequential damages, or for any charges of
the expense of any nature incurred without its written consent. The cost of repair or
replacement shall be the exclusive remedy for any breach of warranty. There is no warranty
against infringement of the like and no implied warranty arising from course of dealing or
usage of trade. This warranty will not apply to any product which has been repaired or
altered outside of the factory in any respect which in our judgment affects its condition or
operation.

Some states do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitation or exclusion may not apply to you. This Warranty gives you
specific legal rights, and you may have other rights which vary from state to state.

®

ANSI Z83.7/CGA 2.14-2000

Mr. Heater | Forced Air Propane Construction Heater Operating Instructions and Owner’s Manual

Mr. Heater Inc. reserves the right to make changes at any time, without notice or
obligation, in colors, specifications, accessories, materials and models.

MR. HEATER INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-881-5500

®

Mr. Heater is a registered trademarks of Enerco Group, Inc.
© 2003, Enerco/Mr. Heater. All rights reserved

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