Mr. Heater MH55FAV Operating Instruction
OPERATING INSTRUCTIONS AND OWNER’S MANUAL
MR. HEATER
MODEL
MH55FAV, MH85FAV
MH125FAV
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.
BUDDY-PRO
MODEL
TS55FAV,
TS125FAV
FORCED AIR PROPANE
CONSTRUCTION HEATER
HEATSTAR
MODEL
HS55FAV, HS85FAV
HS125FAV
WARNING: 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.
— 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 ame.
• Shut off gas to appliance.
— Service must be performed by a qualified service agency.
This is an unvented gas-red 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.
ENERCO GROUP, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000
70056 Rev. D 04/08
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 MONOX-
IDE 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.
The State of California requires the following warning:
WARNING:COMBUSTION BY-PRODUCTS PRO-
DUCED 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 .............................................................................. 9
125FAV PARTS ............................................................................ 9
WARRANTY .............................................................................. 12
SPECIFICATIONS
Type of Gas:................For use with Propane Only
Gas Supply Pressure
to regulator .............Max.: Bottle Pressure
to regulator .............Min.: 5 psig (34.5 kPa)
regulator out ..........28" W.C. (6.97 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)
Operating Instructions and Owner’s ManualEnerco Group, Inc.| Forced Air Propane Construction Heater
2
70056 Rev. B 4/06
SPECIFICATIONS
Model: ................................ 55FAV .................................85FAV................................... 125FAV
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-red, 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
tting, it sinks to the oor, 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 certied for use as a construction
heater in accordance with ANSI Standard Z83.7/CGA 2.14-2000.
Check with your local re safety authority if you have any
questions about your applications. Other standards govern the use
of fuel gases and heat producing 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 ow; therefore,
the heater must not be revised, modied 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 ManualEnerco Group, Inc.| 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 specied. 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. Do not adjust the heater combustion tube elevation while
heater is running or hot. Adjustments to elevation should
only be made after the heater has cooled to touch.
19. Use only in accordance with local codes or, in the absence of
local codes, with the Standard for the Storage and Handling
of Liqueed 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 ft2 .......................... 1 ft
Forced air (85, 125) .............. 2 ft2 .......................... 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.
Operating Instructions and Owner’s ManualEnerco Group, Inc.| Forced Air Propane Construction Heater
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70056 Rev. B 4/06
ODOR FADE WARNING
WARNING
Asphyxiation Hazard
• Do not use this heater for heating human living
quarters.
• Do not use in unventilated areas.
• The ow 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 specication 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
connement 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.
•Alwaysbesensitivetotheslightestgasodor.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 re 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
reghters 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 ManualEnerco Group, Inc.| Forced Air Propane Construction Heater
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OPERATING INSTRUCTIONS
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 3-wire
(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 55FAV, 85FAV and
125FAV 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 by setting control knob to desired level.
6. Igniter continues to re as long as power cord is plugged in.
a) Igniter sparks continually.
7. No thermostat usable with these units.
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 tting. If the "O" ring is cut, scuffed, or otherwise
damaged, replace it with part number 73786.
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.
SERVICING
A hazardous condition may result if a heater is used that has been
modied or is not functioning properly. When the heater is working
properly:
• The ame is contained within the heater.
• The ame 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 tting (called a POL tting) 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 "specications".
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.
HEATER ELEVATION ADJUSTMENT
This heater is equipped with an elevation adjustment panel
located at the exhaust end of the control box.
1. Do not adjust the heater combustion tube elevation while
heater is running or hot. Adjustments to elevation should
only be made after the heater has cooled to touch.
2. To adjust the heater combustion tube elevation, turn the
adjustment screw knob counterclockwise and lift the
combustion tube to desired position.
Operating Instructions and Owner’s ManualEnerco Group, Inc.| Forced Air Propane Construction Heater
6
70056 Rev. B 4/06
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