Mr Heater Fan MHVFB10LP User Manual

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  
 
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  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
3
 
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  
4
 
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  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
5
 
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.  
Installation Instructions and Owner’s Manual  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
6
 
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  
Installation Instructions and Owner’s Manual  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
7
 
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.  
Installation Instructions and Owner’s Manual  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
8
 
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  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
9
 
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.  
Installation Instructions and Owner’s Manual  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
10  
 
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  
Installation Instructions and Owner’s Manual  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
11  
 
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  
Installation Instructions and Owner’s Manual  
 
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
12  
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  
Installation Instructions and Owner’s Manual  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
13  
 
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.  
Installation Instructions and Owner’s Manual  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
14  
 
Installation Instructions and Owner’s Manual  
 
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
15  
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  
Installation Instructions and Owner’s Manual  
Unvented LP-Gas Fired Buddy Wall-Mount Heater  
16  
 

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