Installer: Leave this manual with the appliance. Consumer: Retain this manual for future reference.
INSTALLATION INSTrucTIONS ANd OwNer’S MANuAL
reAd INSTrucTIONS cAreFuLLY: Read and follow all instructions. Place
Mr. HeATer
MHVFB10LP
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.
Operation Instructions Only
No Parts List
UNVENTED LP-GAS FIRED
BUDDY WALL-MOUNT HEATER
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 appliance.
- WHAT TO DO IF YOU SMELL GAS
• Shut off gas supply
• Do not try to light any appliance
• Do not touch an electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
- Installation and service must be performed by a qualified installer, service agency, or the gas supplier.
WARNING: This is an unvented gas-fired heater. It uses air (oxygen) from the room in which it is installed.
Provisions for adequate combustion and ventilation air must be provided. Refer to Fresh Air for Combustion and
Ventilation section on page 3 of this manual.
WARNING: Improper installation, adjustment, alteration, service or maintenance can cause injury or property
damage. Refer to this manual for correct installation and operational procedures. For assistance or additional
information consult a qualified installer, service agency, or gas supplier.
TH
ENERCO GROUP, INC., 4560 W. 160 ST., CLEVELAND, OHIO 44135 · 216-916-3000
70586 Rev. B 04/08
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exists. Make certain you read and understand all warn-
ings. Keep this manual for reference. It is your guide to
safe and proper operation of this heater.
ESTABLISHING ADEQUATE VENTILATION
The following are excerpts from National Fuel Gas
Code, NFPA 54/ ANSI Z223.1, Section 5.3, Air for Com-
bustion and Ventilation. All spaces in homes fall into
one of the three following ventilation classifications:
Product Features
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
Control Knob
This heater must not be installed in a confined space or
unusually tight construction unless provisions are pro-
vided for adequate combustion and ventilation air. The
information on pages 3 through 5 will help you classify
your space and provide adequate ventilation.
Burner
Grill
Heater
Cabinet
Unusually Tight Construction
If your home meets all of the three following criteria you
must provide additional fresh air. See Ventilation Air
from Outdoors, page 5.
Front Panel
Figure 1
Unusually tight construction is defined as construction
where:
SAFETY DEVICE
a. Walls and ceilings exposed to the outside atmo-
sphere have a continuous water vapor retarder with
a rating of one perm (6 x 10-11 kg per pa-sec-m2) or
less with openings gasketed or sealed and
This heater has a pilot with an Oxygen Depletion Sen-
sor (ODS) safety shut off system. The ODS/pilot shuts
off the heater if there is not enough fresh air.
IGNITION SYSTEM
b. Weather stripping has been added on openable win-
PIEZO: MHVFB10LP – The heater is equipped with a
piezo manual ignitor. This system requires no matches,
batteries, or other source to light heater.
dows and doors, and
c. Caulking or sealants are applied to areas such as
joints around windows and door frames, between
wall-ceiling joints, between wall panels, at penetra-
tions for plumbing, electrical, and gas lines, and at
other openings.
LOCAL CODES
Install and use heater with care.
Installation must conform to local codes or in the ab-
sences of local codes, use the latest edition of National
Fuel Gas Code ANSI Z223.1/NFPA 54.
If you home does not meet all of the three criteria
above, see Determine the Type of Heater Location
Space, page 4.
UNPACKING
Confined Space and Unconfined Space
The National Fuel Gas Code, NFPA 54/ ANSI Z223.1
defines a confined space as a space whose volume is
less than 50 cubic feet per 1,000 Btu per hour (4.8 m3
per kW) of the aggregate input rating of all appliances
installed in that space, and an unconfined space as a
space whose volume is not less than 50 cubic feet per
1,000 Btu per hour (4.8 m3 per kW) of the aggregate
input rating of all appliances installed in that space.
Rooms communicating directly with the space in which
the appliances are installed*, through openings not fur-
nished with doors, are considered a part of the uncon-
fined space.
1. Remove heater from carton.
2. Remove all protective packaging applied to
heater for shipment.
3. Check heater for any shipping damage. If
heater is damaged, promptly inform dealer
where you bought heater.
WARNING: Even though this heater may be
used in enclosures such as ice houses, lodges,
cabins or enclosed porches, fresh air for com-
bustion and ventilations requirements apply the
same as below.
FRESH AIR FOR COMBUSTION AND
VENTILATION
*Adjoining rooms are communication only if there
are doorless passageways or ventilation grills be-
tween them.
WARNING: This heater shall not be installed in a
confined space or unusually tight construction un-
less provisions are provided for adequate combus-
tion and ventilation air. Read the following instruc-
tions to insure proper fresh air for this and other
fuel-burning appliances in your home.
DETERMINING THE TYPE OF HEATER
LOCATION SPACE:
Use this method to determine if you have a confined or
unconfined space.
Note: the space includes the room in which you
Installation Instructions and Owner’s Manual
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install heater plus any adjoining rooms with door-
less passageways or ventilation grills between the
rooms.
hr the space can support, the space is an uncon-
fined space. You will need no additional fresh air
ventilation.
1. Find the volume of the space by multiplying room
length x width x height.
VENTILATION AIR
Ventilation from Inside Building
Example: Space size 18ft (length) x 18ft. (width) x 8ft.
(height) = 2592
This fresh air would come from an adjoining unconfined
space. When ventilation to an adjoining unconfined
space, you must provide two permanent openings: one
within 12” of the ceiling and one within 12” of the floor
on the wall connecting the two spaces (see options 1
& 2 of fig. 2). You can also remove door into adjoin-
ing room (see option3, fig 2). Follow the National Fuel
Gas Code NFPA 54/ ANSI Z223.1, Section 5.3, Air for
Combustion and Ventilation for required size of ventila-
tion grills or ducts.
If additional ventilation to adjoining room is supplied
with grills or openings, add the volume of these rooms
to the total volume of the space.
2. Divide the space volume by 50 cubic feet to deter-
mine the maximum Btu/hr the space can support.
Example: 2592 cu.ft. (volume of space) / 50 cu.ft. =
51.8 or 51,800 (maximum Btu/hr the space can
support)
WARNING: If the area in which the heater may be
operated is smaller than defined as an unconfined
space or if the building is of unusually tight con-
struction, provide adequate combustion and ventila-
tion air by the methods described in the National
Fuel Gas Code, NFPA 54/ ANSI Z223.1, Section
5.3 or applicable local codes.
12”
Ventilation Gills
into Adjoining
Room - Option 2
Or remove
Ventilation
door into
Adjoining
Room -
3. Add the Btu/hr of all the fuel-burning appliances
in the space such as, Vent–free heater, Gas water
heater, Gas furnace, Vented gas heater, Gas fire-
place logs, and Other gas appliances*
Gills into
Adjoining
Room -
Option 3
Option 1
*Do not include direct-vent gas appliances. Direct-
vent draws combustion air from the outdoors and
vents to the outdoors.
12”
Example:
Gas water heater 40,000 Btu/hr
Vent Free Heater + 20,000 Btu/hr
Figure 2
Total
=60,000 Btu/hr
WARNING: Rework worksheet, adding the space
of the adjoining unconfined space. The combined
space must have enough fresh air to supply all ap-
pliance in both spaces.
4. Compare the maximum Btu/hr the space can support
with the actual amount of Btu/hr used.
Example: 51,800 Btu/hr (maximum Btu/hr the
space can support)
60,000 Btu/hr (Actual amount of Btu/hr
used)
VENTILATION AIR
OUTLET AIR
VENTILATED
ATTIC
The space in the above example is a confined
space because the actual Btu/hr used is more than
the maximum Btu/hr the space can support.
TO ATTIC
You must provide additional fresh air. Your options
are as follows:
OUTLET
AIR
TO CRAWL
SPACE
A. Rework worksheet, and the space of an adjoining
room. If the extra space provides an unconfined
space, remove door to adjoining room or add venti-
lation grills between the rooms. See Ventilation Air
From Inside Building (Fig. 2)
INLET
AIR
VENTILATION CRAWL SPACE
B. Vent room directly to the outdoors. See Ventilation
Air From Outdoors (Fig. 3).
Figure 3.
C. Install a lower Btu/hr heater if lower Btu/hr size
makes room unconfined.
Ventilation from Outdoors
If necessary provide extra fresh air by using ventilation
grills or ducts. Connect these items directly to the out-
If actual Btu/hr used is less than the maximum Btu/
Installation Instructions and Owner’s Manual
Unvented LP-Gas Fired Buddy Wall-Mount Heater
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doors or spaces open to the outdoors. These include
attics* and crawl spaces. Follow the National Fuel Gas
Code NFPA 54/ ANSI Z223.1, Section 5.3, Air for Com-
bustion and Ventilation for required size of ventilation
grills or ducts.
•
•
Where there is easy access for operation,
inspection, and service.
In the coldest part of the room.
CAUTION: If you install the heater in a home garage:
• Heater pilot and burner must be at least 18
*IMPORTANT: Do not provide openings for inlet or
outlet into attic. If attic has a thermostat-controlled
power vent, heated air entering the attic will activate
the power vent.
inches above floor.
• Locate heater where moving vehicle will not hit it.
CAUTION: This heater creates warm air currents. These
currents move heat to wall surfaces next to heater. In-
stalling heater next to vinyl or cloth wall covering or op-
erating heater where impurities (such as tobacco smoke,
aromatic candles, cleaning fluids, oil or kerosene lamps,
etc.) are present in the air may discolor walls.
IMPORTANT: Vent-free heaters add moisture to the
air. Although this is beneficial, installing heater in
rooms without enough ventilation air may cause mil-
dew to form from too much moisture. See Fresh Air
for Combustion and Ventilation, pages 3 through 5.
INSTALLATION
WARNING: Never install the heater:
NOTICE: This heater is intended for the use as supple-
mental heat. Use this heater along with your primary
heating system. Do not install this heater as your
primary heat source. If you have a central heating sys-
tem, you may run system’s circulating blower while us-
ing heater. This will help circulate the heat throughout
the house. In the event of a power outage, you can use
this heater as your primary heat source for the duration
of the outage.
•
•
•
In a bathroom.
In a bedroom
In a recreational vehicle.
•
Where curtains, furniture, clothing, or other
flammable objects are less than 36 inches from
the front, top, or sides of the heater.
•
•
•
As a fireplace insert
In high-traffic areas
In windy or drafty areas
WARNING: A qualified service person must install
heater. Follow all local codes.
WARNING: Heater must be mounted to maintain
the minimum clearances shown in Figure 4. If pos-
sible, provide greater clearances from the floor, ceil-
ing, and joining walls.
CHECK GAS TYPE
Use only LP-gas. If your gas supply is not LP-gas, do
not install heater. Call dealer where you bought heater
for proper type heater.
FOR PERMANENT INSTALLATION:
Before installing heater, make sure you have the items
listed below:
•
•
•
•
•
•
•
•
Piping (check local codes)
Sealant (resistant to LP_Gas)
Equipment shutoff valve*
Ground joint union
Test gauge connection*
Sediment trap
36” min. from
ceiling
6” Min from
adjoining
walls
Left
Side
Right
Side
Tee joint
Pipe wrench
*A CSA/AGA certified equipment shutoff valve with
1/8” NPT tap is an acceptable alternative to test gauge
connection. Purchase a CSA/AGA certified equipment
shutoff valve from your dealer. See Accessories, page
17.
Floor
2” min. to top surface of carpet, tile
or other combustible material
Figure 4
FASTENING HEATER TO WALL
Mounting Bracket
This heater may also be installed with the hose and
regulator assembly included with heater.
LOCATING HEATER
This heater is designed to be mounted on the wall.
The mounting bracket in located on the back panel of
heater (see figure 5). It has been taped there for ship-
For convenience and efficiency, install the heater:
Installation Instructions and Owner’s Manual
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ping. Remove mounting bracket from back panel.
2. Mark screw locations on wall (see figure 7).
3. Remove tape and mount bracket from wall.
6-1/2” Min. 10,000 BTU
Mounting
Bracket
12-9/64” (Sm)
17-1/2” Min.
Figure 5
Mark mounting hole locations
and drill holes where indicated.
Allow for minimum clearances
Removing Front Panel of Heater
1. Remove three screws on bottom front of front
panel.
2. Pull bottom of front panel forward, then down
(see figure 6)
Figure 7
Attaching to Wall Stud:
For attaching mounting bracket to wall studs
1. Drill holes at marked locations using 9/64” drill bit.
2. Place mounting bracket onto wall. Line up
holes on each end of bracket with hole drilled in
wall.
3. Insert mounting screws through bracket and
into wall studs.
Figure 6
4. Tighten screws until mounting bracket is firmly
fastened to wall studs.
Attaching Mounting Bracket to Wall
Use holes on each end of mounting bracket to attach
bracket to wall. These holes are 16 inches apart. At-
tach mounting bracket to wall in one of two following
ways.
Attaching to Wall using Anchor:
For attaching mounting bracket to hollow walls (wall ar-
eas between studs) or solid walls (concrete or masonry)
Note: Wall anchors, mounting screws, and spacer
are in hardware package. The hardware package
is provided with heater.
1. Attach to wall studs
2. Attach to wall anchor
Attaching to Wall Stud:
This way is the best providing the strongest mounting in
wood frame houses.
1. Drill holes at marked locations using 5/16” drill
bit. For solid walls (concrete or masonry), drill
at least 1” deep.
2. Fold wall anchor as shown in figure 8 below.
Attaching to Wall Anchor:
This way allows you to attach mounting bracket to hol-
low walls (wall areas between studs) or to solid walls
(concrete or masonry).
Decide which way best suits your needs. Either method
will provide a secure hold for the mounting bracket.
Figure 8.
3. Insert wall anchor (wings first) into hole. Tap
anchor flush to wall.
1. Tape mounting bracket to wall where heater
will be located. Make sure mounting bracket is
level. For wall stud mounting locate one end of
the mounting bracket over a wall stud.
4. For thin walls (1/2” or less) insert red key into
wall anchor.
5. Place mounting bracket onto wall. Line up
holes on each end of bracket with wall anchors.
WARNING: Maintain minimum clearances
shown in figure 7. If you can, provide greater
clearances from the floor and joining wall.
6. Insert mounting screws through bracket and
into wall anchors.
7. Tighten screws until mounting bracket is firmly
fastened to wall.
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Placing Heater on Mounting Bracket
WARNING: This appliance requires a 3/8” NPT
(National Pipe Thread) inlet connection to the pres-
sure regulator.
1. Locate two horizontal slots on back pane of
heater (see figure 19).
2. Place heater onto mounting bracket. Slide hori-
zontal slots onto stand-out tabs on mounting
bracket.
CAUTION: Never connect heater directly to the Propane
supply. This heater requires an external regulator (not
supplied). Install the external regulator between the
heater and Propane/LP supply.
The installer must supply an external regulator. The ex-
ternal regulator will reduce the incoming gas pressure
to between 11 and 14 inches of water. If you do not
reduce incoming gas pressure heater regulator dam-
age could occur. Install external regulator with the vent
pointing down as shown in Figure 12. Pointing the vent
down protects it from freezing rain or sleet.
Horizontal Slots
CAUTION: Use only new black iron or steel pipe.
Internally-tinned copper tubing may be used in certain
areas. Check your local codes. Use pipe of larger
enough diameter to allow proper gas volume to heater.
If pipe is too small, undue loss of pressure will occur.
Mounting Bracket
mounted to wall
Mounting Screws
Installation must include an equipment shutoff valve,
union and plugged 1/8” NPT tap. Locate NPT tap within
reach of test gauge hookup. NPT tap must be up-
stream from heater (see figure 12).
Figure 9
Installing Bottom Mounting Screws
1. Locate two bottom mounting screw holes.
These holes are near bottom on back panel of
heater (see figure 9).
Pressure
Regulator
2. Mark screws locations on wall.
3. Remove heater from mounting bracket.
3/8” NPT Pipe Nipple
Ground Joint Union
Heater
Cabinet
4. If installing bottom mounting screw into hol-
low or solid wall, install wall anchors. Follow
steps 1 through 4 under Attaching to Wall using
Anchor. If installing bottom mounting screw into
wall stud, drill holes at marked locations using
9/64” drill bit.
Test Gauge
Connection
Equipment
Shutoff Valve
Tee Joint
Reducer Bushing
to 1/8” NPT
From Gas Meter
(4” W.C. to 10.5”
W.C. Pressure)
1/8” NPT Plug Tap
5. Re-place heater onto mounting bracket.
Tee Joint
Pipe Nipple
Cap
Sediment
Trap
6. Place spacers between bottom mounting holes
and wall anchor or drilled hole.
3” Minimum
7. Hold spacer in place with one hand. With the
other hand, insert mounting screw through
bottom mounting hole and spacer. Place tip of
screw in opening of wall anchor or drilled hole.
Figure 12
*A CSA/AGA certified equipment shutoff valve with 1/8”
NPT tap is an acceptable alternative to test gauge con-
nection. Purchase the CSA/AGA certified equipment
shutoff valve from your dealer. SeeAccessories, page 17.
8. Tighten both screws until heater is firmly se-
cured to wall. Do not over tighten.
Note: Do not re-place front panel at this time. Re-
place front panel after making gas connections and
checking for leaks.
IMPORTANT: Install an equipment shutoff valve in an
accessible location. The equipment shutoff valve is for
turning on or shutting off the gas to the appliance.
CONNECTING TO GAS SUPPLY FOR
PERMANENT INSTALLATION
Apply pipe joint sealant lightly to male threads. This will
prevent excess sealant from going into pipe. Excess
sealant in pipe could result in clogged heater fuel train.
WARNING: A qualified service person must con-
nect heater to gas supply. Follow all local codes.
CAUTION: Use pipe joint sealant that is resistant to
LP-Gas.
Install sediment trap in supply line as shown in figure
12. Locate sediment trap where it is within reach for
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LIGHTING / OPerATING INSTrucTIONS FOr
uSe wITH HOSe cONNecTed TO A reMOTe
cYLINder, MAXIMuM SIZe 20 LBS:
• This Heater may be used in a Recreational Enclosure or
Temporary Construction Work Enclosure with a Remote
Refillable Propane Cylinder ONLY when the Cylinder
is Located Outdoors and the Heater is Used with Mr.
Heater Hose assembly supplied.
cleaning. A sediment trap traps moisture and con-
taminants. This keeps them from going into heater. If
sediment trap is not installed or is installed improperly,
heater may not run correctly.
IMPORTANT: Hold pressure regulator with wrench
when connecting it to gas piping and/or fittings.
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping and connections for
leaks after installing or servicing. Correct all leaks
at once.
• dANGer: NEVER bring a refillable propane cylinder
indoors. A fire or explosion can occur causing property
damage, serious injury or death!
WARNING: Never use an open flame to check for
a gas leak. Apply a mixture of liquid soap and water
to all joints. Bubbles forming show a leak. Correct
all leaks at once.
• Inspect the hose before each use of the heater. If there
is excessive abrasion or wear, or the hose is cut, replace
prior to using the heater with one of the Mr. Heater
Hose assembly supplied (see parts list).
PRESSURE TESTING GAS SUPPLY PIPING
SYSTEM
• The propane cylinder must include a listed overfilling
protection device as well as a collar to protect the cylin-
der valve.
Test pressure in Excess of ½ psig (3.5kPa)
• Heater must be in an upright position during operation.
1. Disconnect appliance with its appliance main
gas valve (control valve) and equipment shutoff
valve from gas supply piping system. Pres-
sures in excess of ½ psig will damage heater
regulator.
• Make sure five-position Control Knob is in “OFF” posi-
tion.
• Screw hose connector into regulator on heater and
screw connector on other end of hose into a regulated
LP-gas supply cylinder valve. Tighten all hose connec-
tions.
2. Cap off open end of gas pipe where equipment
shutoff valve was connected.
• Open valve at LP-gas supply cylinder.
3. Pressurize supply piping system by either using
compressed air or opening main gas valve on
or near gas meter.
• Check all hose connections for leaks with soapy water
at the threaded connection on heater where the hose
connector screws into the regulator and at LP-gas supply
cylinder.
4. Check all connections and joints in gas supply
piping system. Apply mixture of liquid soap and
water to gas joints. Bubbles forming show a
leak.
Pressure Testing Heater Gas Connections:
1. Make sure that the heater supply piping sys-
tem is connected and has been leak tested as
described above.
5. Correct all leaks at once.
6. Depressurize and relieve pressure in supply
piping system.
2. Make sure control knob of heater is in OFF
position.
7. Reconnect heater and equipment shutoff valve
to gas supply.
3. Open equipment shutoff valve (see figure 13).
4. Open propane/LP supply valve.
8. Reconnected fittings must be checked for leaks
in next section.
5. Check all joints from equipment shutoff valve
to control valve (see figure 14). Apply mixture
of liquid soap and water to gas joints. Bubbles
forming show a leak.
Test Pressure Equal To or Less Than ½ psig
(3.5 kPa)
6. Correct all leaks at once.
1. Close equipment shutoff valve (see figure 13).
7. Light heater (see Operating Your Heater, pages
11 and 12 for thermostat models or pages 9
and 10 for non-thermostat models). Check the
rest of the internal joints for leaks.
2. Pressurize supply piping system by either using
compressed air or opening propane/LP supply
valve.
3. Check all joints from the propane/LP supply
valve to equipment shutoff valve (see figure
14). Apply mixture of liquid soap and water to
gas joints. Bubbles forming show a leak.
8. Turn off heater (see To Turn OFF Gas to Appli-
ance, page 12 for thermostat models and page
11 for non-thermostat models).
9. Replace lower front panel.
4. Correct all leaks at once.
5. Depressurize and relieve pressure from supply
piping system.
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Open
C. Use only your hand to push in or turn the gas
control knob. Never use tools. It knob will not
push in or turn by hand, don’t try to repair it; call
a qualified service technician or gas supplier.
Force or attempted repair may result in a fire or
explosion.
Equipment
Shutoff Valve
Closed
D. Do not use this appliance if any part has been
underwater. Immediately call a qualified ser-
vice technician to inspect the appliance and to
replace any part of the control system which
has been underwater.
Figure 13
LIGHTING INSTRUCTIONS
Control Valve
1. STOP! Read the all safety information included
with and on the side of heater.
2. Check that gas supply to heater is on.
3. Push in gas control knob and slightly turn clock-
wise to the OFF position (see figure 16).
Note: Knob cannot be turned from PILOT to OFF
unless knob is pushed in slightly. Do not force.
Gas Meter
4. Wait five (5) minutes. Then smell for gas, in-
cluding near the floor. If you smell gas, STOP!
Follow “B” in the safety information above. If
you do not smell gas, go to the next step.
Equipment
Shutoff Valve
5. Push in gas control know slightly and turn
counterclockwise to PILOT/IGN and depress
for five (5) seconds.
Note: The first time that the heater is operated after
connecting the gas supply, the control knob should
be depressed for about 30 seconds. This will allow
air to bleed from the gas system.
Figure 14
6. Push in control knob and rotate control knob
back to OFF position then rotate counterclock-
wise to PILOT/IGN position. This will light pilot.
If needed gently keep rotating control knob
back and forth while depressed until pilot lights.
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not follow these instructions
exactly, a fire or explosion may result causing prop-
erty damage, personal injury or loss of life.
7. Keep control knob depressed in for ten (10)
seconds after lighting pilot. If pilot goes out,
repeat steps 4, 5, 6 and 7.
A. This appliance has a pilot that must be lighted
by hand. When lighting the pilot, follow these
instructions exactly.
•
If pilot does not stay lit, refer to Troubleshoot-
ing, pages 14 & 15. Also, contact a qualified
service person or gas supplier for repairs.
B. BEFORE LIGHTING smell all around the appli-
ance area for gas. Be sure to smell next to the
floor because some gas is heavier than air and
will settle on the floor.
•
If control knob does not pop up when released,
contact a qualified service person or gas sup-
plier for repairs.
WHAT TO DO IF YOU SMELL GAS
•
•
Do not try to light any appliance.
•
•
When the pilot is lit, turn the control knob to “HI”
position to light heater.
Do not touch any electrical switch; do not use
any phone in your building.
After flame is established (see Burner Flame
Pattern, Pages 12 and 13) on “HI”, adjust
heat output by turning control knob to desired
position (“LO” or “HI”). Do not operate heater
between locked positions.
•
•
Immediately call you gas supplier from a neigh-
bor’s phone. Follow the gas supplier’s instruc-
tions.
If you can not reach your gas supplier, call the
fire department.
Installation Instructions and Owner’s Manual
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PILOT FLAME PATTERN
Control Knob
Figure 21 show a correct pilot flame pattern. Figure 22
shows an incorrect pilot flame pattern. The incorrect
pilot flame pattern is not touching thermocouple. This
will cause the thermocouple to cool. When the thermo-
couple cools, the heater will shut down. If pilot flame
pattern is incorrect, as shown in Figure 22:
•
Turn heater off (see To Turn OFF Gas to Appli-
ance, page 11 for non-thermostat models).
•
See Troubleshooting, pages 14 and 15.
Figure 16
Figure 22
BURNER FLAME PATTERN
Figure 23 show a correct burner flame pattern. Figure
24 shows an incorrect burner flame pattern. If burner
flame pattern is incorrect, as shown in Figure 24:
•
Turn heater off (see To Turn OFF Gas to Appli-
ance, page 11 for non-thermostat models).
Figure 17
•
See Troubleshooting, pages 14 and 15.
CAUTION: Do not try to adjust heating level by using
equipment shutoff valve.
1/2 Steel Panel
Height
WARNING: When running heater, set control knob
at “LO” or “HI” locked positions. Poor combustion
and higher levels of carbon monoxide may result
if heater is operated with control knob positioned
between locked positions.
Figure 23
Figure 24
IMPORTANT: Release downward pressure while turn-
ing control knob. Control knob must be locked at the
desired position.
1/2 Steel Panel
Height
TO TURN OFF GAS TO APPLIANCE
SHUTTING OFF HEATER:
1. Turn control knob clockwise to the OFF posi-
tion.
2. Turn off equipment shutoff valve.
CLEANING AND MAINTENANCE
WARNING: Turn off heater and let cool before
servicing.
SHUTTING OFF BURNER ONLY (PILOT STAYS LIT)
1. Turn control knob clockwise to the PILOT/IGN
position.
CAUTION: You must keep control areas, burner and
circulation air passageways of heater clean. Inspect
these areas of heater before use. Have the heater
inspected yearly by a qualified service person. Heater
may need more frequent cleaning due to excess lent
from carpeting, bedding material, pet hair, etc.
INSPECTING BURNER
Check pilot flame pattern and burner flame pattern
often.
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Make sure grille guard is in place before running
heater. If screen or grille guard is removed for servic-
ing it must be replaced prior to operating the heater.
CLEANING HEATER CABINET
Air passageways
•
Use a vacuum cleaner or pressurized air to
clean exterior
WARNING: Failure to keep the primary air
opening(s) of the burner(s) clean may result in soot-
ing and property damage.
•
Use a soft cloth dampened with a mild soap
and water mixture. Wipe the cabinet to remove
dust.
CLEANING ODS/PILOT AND BURNER
•
Use as vacuum cleaner, pressurized air or
small soft bristled brush to clean.
CLEANING BURNER PILOT AIR HOLE INLET
We recommend that you clean the unit ever 2,500
hours of operation or every three months. We also
recommend that you keep the burner tube and pilot as-
sembly clean and free of dust and dirt. To clean these
parts we recommend using compressed air no greater
than 30 psig.
SPECIFICATIONS
MHVFB10LP
10,000
This can be done by using a vacuum cleaner in the
blow position, using compressed air in a can, please
follow the directions on the can. If you don’t follow
directions on the can you could damage the burner or
pilot assembly. In addition, the directions that follow
should also be followed.
BTU (Available)
Type of Gas
LP-Gas Only
Piezo
Ignition
Pressure Regulator Setting
10 Inches of
Water
1. Shut off the unit, including the pilot. Allow the
unit to cool for at least thirty minutes.
Inlet Gas Pressure (Maximum) 14 Inches of
Water
2. Inspect burner and pilot for dust and dirt.
Inlet Gas Pressure (Minimum) 11 Inches of
3. Blow air through the port/slots and holes in the
burner.
Water
A yellow tip on the pilot flame indicates dust and dirt
in the pilot assembly. To clean the pilot assembly find
the small pilot air inlet hole about two inches from
where the pilot flame comes out of the pilot assembly
(see Pilot Air Inlet Hole in figure 25). With the unit off,
lightly blow air through the air inlet hole. You may blow
through a drinking straw if compressed air is not avail-
able.
Burners / Orifice nozzles
Thermostatic Control
Clearances: inches (mm)
Top
1
No
36” (915cm)
6” (152cm)
2” (51cm)
Sides
Floor (min. to top of carpet)
Fabric / flammable objects
36” (915cm)
Figure 25
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TROUBLESHOOTING
NOTE: All troubleshooting items are listed in order of operation and likely occurrence.
WARNING: Only a qualified service person should service and repair heater.
CAUTION: Never use a wire needle, or similar object to clean ODS/pilot. This can damage ODS/pilot unit.
Make sure grille guard is in place before running heater. If screen or grille guard is removed for servicing it must be
replaced prior to operating the heater.
OBSERVED SYMPTOM
POSSIBLE CAUSE
REMEDY
When Piezo ignitor knob is
turned, there is no spark at pilot
1. Ignitor electrode positioned wrong.
2. Ignitor electrode is broken.
1. Reposition electrode
2. Replace electrode
3. Ignitor electrode not connected to ignitor.
4. Ignitor cable pinched or wet.
3. Reconnect ignitor cable
4. Free ignitor cable if pinched by any metal
or tubing. Keep ignitor cable dry.
5. Broken ignitor cable.
6. Bad Piezo ignitor.
5. Replace ignitor cable
6. Replace control valve (Piezo is part of
control valve on 10K units).
1. Turn on gas supply or open equipment
shutoff valve.
1. Gas supply turned off or equipment shut-
off valve closed.
ODS/pilot lights but flame
goes out when control knob is
released
2. Continue holding down control knob. Re-
2. Air in gas line when installed.
peat ignition operation until air is removed.
3. ODS/pilot is clogged.
3. Clean ODS/pilot (see Cleaning and Main-
tenance page 13).
4. Gas regulator setting is not correct
5. Control knob not in pilot position
1. Control knob not fully pressed in.
2. Control knob not pressed in long enough
4. Replace gas regulator
5. Turn Control knob to pilot position
1. Press in control knob fully
When Piezo ignitor knob is
turned, there is a spark at the
ODS/pilot but no ignition
2. After ODS/pilot lights, keep control knob
pressed in for 30 seconds
3. Equipment shutoff valve not fully open
3. Fully open equipment shutoff valve
4. Thermocouple connection loose at con-
trol valve
4. Hand tighten thermocouple nut until snug,
and then tighten 1/4 turn more.
5. Pilot flame not touching thermocouple,
which allows thermocouple to cool, caus-
ing pilot flame to go out. This problem
could be caused by one or both of the
following:
5. -
a. Low gas pressure
a. Contact local gas company
b. Dirty or partially clogged ODS/pilot
b. Clean ODS/pilot (see Cleaning and
Maintenance, page 13).
6. Thermocouple damaged
7. Control valve damaged
1. Burner orifice is clogged
6. Replace thermocouple
7. Replace Control valve.
1. Clean burner orifice (see Cleaning and
Maintenance on page 13), or replace
burner orifice
Burner does not light after
ODS/pilot is lit
2. Burner orifice diameter to small
3. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice is clogged
2. Replace burner orifice
3. Contact local gas company
1. Contact local gas company
Delayed ignition of burner
2. Clean burner orifice (see Cleaning and
Maintenance on page 13), or replace
burner orifice
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TROUBLESHOOTING CON’T
OBSERVED SYMPTOM
POSSIBLE CAUSE
REMEDY
1. Clean burner orifice (see Cleaning and
Maintenance on page 13), or replace
burner orifice
1. Burner orifice is clogged or damaged
Burner backfiring during opera-
tion
2. Burner damaged
2. Replace burner
3. Gas regulator defective
1. Residues from manufacturing process
3. Replace gas regulator
1. Problem will stop after a few hours of
operation
Slight smoke or odor during
initial operation
1. Turn control knob to LO position and let
warm up for a minute.
Heater produces a whistling
noise when burner is lit
1. Turning control knob to HI position when
burner is cold
2. Operate burner until air is removed from
line have gas line checked by local gas
company.
3. Observe minimum installation clearances
(see Figure 4 page6)
4. Clean burner orifice (see Cleaning and
Maintenance on page 13), or replace
burner orifice.
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orifice.
1. Turn heater off when using furniture
polish, wax, carpet cleaner or similar
products.
White powder residue forming
within burner box or on adja-
cent walls or furniture
1. When heated, vapors from furniture polish,
wax, carpet cleaners, etc., turn into white
powder residue
TROUBLESHOOTING
WARNING: If you smell gas:
•
•
•
•
•
Shut off gas supply
Do not try to light any appliance
Do not touch any electrical switch; do not use any phone in your building
Immediately call you gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
If you cannot reach your gas supplier, call the fire department.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning supplies, paint, paint remover,
cigarette smoke, cements and glues, new carpet or textiles, etc., create fumes. These fumes may mix with combustion air
and create odors and possible discoloration of walls and ceilings.
OBSERVED SYMPTOM
POSSIBLE CAUSE
REMEDY
1. Heater burning vapors from paint, hair
spray, glues, etc. See IMPORTANT state-
ment above
1. Ventilate room. Stop using odor-causing
products while heater is running.
Heater produces unwanted
odors.
2. Gas leak. See WARNING statement at top 2. Locate and correct all leaks (see Checking
of page.
Gas Connections, page 8)
1. Not enough fresh air is available
2. Low line pressure
1. Open window and/or door for ventilation
2. Contact local gas company
Heater shuts off in use (ODS
operates)
3. ODS/pilot is partially clogged
3. Clean ODS/pilot (see Cleaning and Mainte-
nance, page 11)
1. Locate and correct all leaks (see Checking
Gas Connections, page 8)
2. Replace control valve
1. Gas leak. See WARNING statement at top
of page
2. Control valve is defective
Gas odor even when control
knob is in OFF position
1. Take apart gas tubing and remove foreign
matter
1. Foreign matter between control valve and
burner
Gas odor during combustion
2. Locate and correct all leaks (see Checking
Gas Connections, page 8)
2. Gas leak. See WARNING statement at top
of page
Heater produces a clicking/tick-
ing noise just after burner is lit
or shut off
1. This is common with most heaters. If noise
is excessive, contact qualified service
person
1. Metal expanding while heating or contract-
ing while cooling
1. Refer to Fresh Air for Combustion and
Ventilation page 3 through 5.
Moisture/condensation noticed
on windows
1. Not enough combustion/ventilation air
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REPLACEMENT PARTS
TECHNICAL SERVICE
You may have further questions about installation,
operation, or troubleshooting, if so, contact Enerco
Group, Inc.’s 800# on the back of this manual.
Note: use only original replacement parts. This will
protect you warranty coverage for parts replaced
under warranty.
ACCESSORIES
PARTS UNDER WARRANTY
Purchase these heater accessories from your local
dealer. If they can not supply these accessories,
contact your nearest Parts Central or call Enerco
Group, Inc.’s 800# for information. You can also
write to the address listed on the front page of this
manual.
Contact authorized dealer from whom you pur-
chased this product. If they are unable to supply
original replacement part(s), call the number on
back of manual. When contacting your dealer have
ready:
•
•
•
•
•
•
Your name
Equipment Shutoff Valve
Your address
Model and serial numbers of your heater
How heater was malfunctioning
Type of gas used (propane/LP)
Purchase date
For all models, Equipment shutoff valve with 1/8”
NPT tap.
PARTS LIST
Non-Thermostat model
Usually, we will ask you to return the defective part
to the factory.
MHVFB10LP
This list contains replacement parts used in your
heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 17 of this
manual.
PARTS NOT UNDER WARRANTY
Contact authorized dealer of this product. If they
can’t supply original replacement part(s), call Ener-
co Group, Inc.’s 800# on the back of this manual.
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WARRANTY INFORMATION
Keep this warranty
Model ______________________
Serial No. ___________________
Date Purchased _______________
Always specify model and serial numbers when communication with the factory.
We reserve the right to amend these specifications at any time without notice. The only warranty appli-
cable is our standard written warranty. We make no other warranty, expressed or implied.
Enerco Group, Inc. warrants this product to be free from defects in materials and components for two (2)
years from the date of first purchase, provided that the product has been properly installed, operated and
maintained in accordance with all applicable instructions. To make a claim under this warranty the Bill of
Sale or cancelled check must be presented.
The warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s)
required to restore the heater to proper operating condition and an allowance for labor when provided by
an Enerco Group, Inc. Authorized Service Center. Warranty part(s) MUST be obtained through authorized
dealers of this product and/or Enerco Group, Inc. who will provide original factory replacement parts. Fail-
ure to use original factory parts voids this warranty. The heater MUST be installed by a qualified installer in
accordance with all local codes and instructions furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear of
parts that fail or become damaged as a result of misuse, accidents, lack of proper maintenance or defects
caused by improper installation. Travel, diagnostic cost, labor, transportation and any and all such costs
related to repairing a defective heater will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE
OF THE PRODUCT; THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED
WARRANTIES AND LIMITS THE DURATION OF ANY AND ALL IMPLIED WARRANTIES OF MER-
CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TO TWO (2) YEARS OF ALL COMPO-
NENTS FROM THE FIRST DATE OF PURCHASE; AND ENERCO GROUP, INC.’S LIABILITY IS HEREBY
LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND ENERCO GROUP, INC. SHALL NOT BE
LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT, INCIDENTAL OR CON-
SEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation on
incidental or consequential damages, so the above limitation on implied warranties, or limitation on dam-
ages, may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights that very from state to
state. Always specify model and serial number when communication with the factory.
ENERCO GROUP, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135
216-881-5500
Toll Free Number 1-800-251-0001
Mr. Heater is a registered trademarks of Enerco Group, Inc.
© 2005, Enerco/Mr. Heater. All rights reserved
ANSI Z21.11.2b-2004
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