Mr Heater Water Heater MH9B User Manual

Model #  
MH9B  
OPERATING INSTRUCTIONS  
AND OWNER’S MANUAL  
READ INSTRUCTIONS CAREFULLY: Read and follow all instructions. Place instructions in a  
safe place for future reference. Do not allow anyone who has not read these instructions to  
assemble, light, adjust or operate the heater.  
PORTABLE PROPANE HEATER FOR  
RECREATIONAL AND COMMERCIAL  
U S E  
For California Sale  
If the information in this manual is not followed exactly, a fire or explo-  
sion may result causing property damage, personal injury or loss of life.  
WARNING:  
— Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or  
any other appliance.  
— An LP cylinder not connected for use shall not be stored in the vicinity of this or any other  
appliance.  
— WHAT TO DO IF YOU SMELL GAS  
Do not try to light appliance.  
Extinguish any open flame.  
Shut off gas to appliance.  
— Service must be performed by a qualified service agency.  
This is an unvented gas-fired portable heater. It uses air (oxygen) from the area in which it is  
used. Adequate combustion and ventilation air must be provided. See “General Safety Instructions”.  
05/12/06 73432CAL Rev. L1  
ENERCO GROUP INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000  
 
CAUSE THE HEATER TO TIP OVER. NEVER  
OPERATE THE HEATER WHILE SLEEPING!  
GENERAL SAFETY INSTRUCTIONS  
THIS IS A HEATING APPLIANCE. DO NOT OPERATE  
THIS APPLIANCE WITHOUT THE FRONT WIRE  
GUARD INSTALLED  
Due to high temperatures, the appliance should be  
located out of traffic and away from combustible  
materials.  
Children and adults should be alerted to the hazard  
of high surface temperatures and should stay away  
to avoid burns or clothing ignition.  
Young children should be carefully supervised when  
they are near the appliance.  
Do not place clothing or other flammable material on  
or near the appliance.  
Do not operate heater in any moving vehicle.  
This heater can only be used in a recreational or  
commercial enclosure with a window or roof vent. It  
may also be used outdoors.  
GENERAL INFORMATION:  
This heater is safe for indoor use in small recre-  
ational enclosures, having means for providing  
combustion air and ventilation, such as enclosed  
porches, cabins, fishing huts, trailers, tent trailers,  
tents, truck caps and vans. It may be used in commercial  
enclosures, having means for providing combustion air  
and ventilation, such as construction trailers or tempo-  
rary work enclosures.  
This heater requires a vent area of 9 square inches  
(example 3” x 3” opening) minimum for adequate  
ventilation during operation. Do not use other fuel  
burning appliances inside.  
GAS PRESSURE AT HEATER IS REGULATED  
AND FIXED AT 11” W.C. WHEN USING A REMOTE  
HOSE CONNECTION DO NOT REGULATE OR  
REDUCE PROPANE TANK SUPPLY PRESSURE  
TO HEATER!  
Note: The heater can be used outdoors, but may experience  
nuisance shutoffs due to certain wind conditions.  
When the heater is cold or at room temperature, it will  
take a few minutes for the burner tile to turn bright  
orange. This is normal and the heater is working prop-  
erly. If burner tile is visibly flaming, turn heater off and  
call a qualified service technician.  
REGULATOR IN HEATER MUST ALWAYS BE IN  
PLACE DURING OPERATION.  
Any safety screen or guard removed for servicing  
the appliance must be replaced prior to operating  
the heater.  
When the unit is lit, there should be about a quarter  
inch (1/4”) border around the tile that will not turn  
bright orange. This is normal.  
The appliance should be inspected before each use.  
Frequent cleaning may be required. The control  
compartments, burner and circulating air passage-  
ways of the appliance must be kept clean, see  
MAINTENANCE.  
When operating the heater for the first time, the top  
area of the reflector may discolor. This is also  
normal and is no reason for concern.  
DO NOT use this heater if any part has been under  
water. Immediately call a qualified service technician  
to inspect the heater and to replace any part of the  
control system and any gas control, which has been  
under water.  
When operating the heater at altitudes over 7,000  
FT. above sea level, the unit may not burn as bright  
as in lower altitudes. This is normal. At higher  
altitudes, the heater may shut-off. If this happens,  
provide fresh air, wait 5 minutes and re-light. Due to  
local atmospheric conditions heater may not re-light.  
When used without adequate combustion and  
ventilation air, this heater may give off excessive  
CARBON MONOXIDE, an odorless, poisonous gas.  
Operating time will vary depending on the heater  
setting and the supply cylinder size. 3 to 6 hours on  
a 1 lb. cylinder. 48 to 110 hours on a 20 lb. cylinder  
(based on “HI” and “LO” settings).  
Some people - pregnant women, persons with heart  
or lung disease, anemia, those under the influence  
of alcohol, those at high altitudes - are more affected  
by carbon monoxide than others.  
When moving heater when lit or bumping heater  
setting it down, tip over switch may shut off heater. If  
this happens, re-light.  
When heater is placed on the ground, make sure  
the ground is level and keep any objects at least 24  
inches from the front of the heater. THIS HEATER  
IS EQUIPPED WITH A TIP OVER SWITCH THAT  
WILL SHUT THE HEATER OFF IF THE HEATER  
TIPS OVER HOWEVER, DO NOT LEAVE HEATER  
UNATTENDED OR WHERE CHILDREN MAY  
Due to natural operation of small tanks, condensa-  
tion may build up on tank and drip on surface under  
heater.  
Mr. Heater | Portable Buddy  
Operating Instructions and Owner’s Manual  
05/12/06 73432CAL Rev. L1  
3
 
LIGHTING / OPERATING INSTRUCTIONS FOR  
USE WITH DISPOSABLE 1 LB. PROPANE  
CYLINDERS:  
After burner tile has turned bright orange, adjust heat  
output by turning Control Knob to desired position  
(“LO” or “HI” setting)  
WARNING: Always inspect propane cylinder and heater  
propane connections for damage, dirt, and debris before  
attaching propane cylinder. Do not use if head of cylinder is  
damaged, punctured or deteriorated.  
ALWAYS ATTACH OR DETACH CYLINDER OUTDOORS  
AWAY FROM FLAMES, OTHER IGNITION SOURCES, AND  
ONLY WHEN HEATER IS COOL TO TOUCH. NEVER  
SMOKE WHEN ATTACHING OR REMOVING PROPANE  
CYLINDER OR MAKING REMOTE CONNECTIONS!  
Warning:  
DO NOT OPERATE HEATER UNLESS CONTROL KNOB IS  
LOCKED IN A POSITION MARKED “HI”, “LO” or  
“PILOT”.NEVER SET CONTROL KNOB BETWEEN LOCKED  
POSITIONS. POOR COMBUSTION AND HIGHER LEVELS  
OF CARBON MONOXIDE MAY RESULT.  
To shut off heater, slightly push down and turn Control  
Knob clockwise to “OFF” position.  
Use only LP-gas cylinders marked in accordance  
with the U.S. Dept. of Transportation (DOT).  
Use only 16.4 oz. (1 lb.) disposable cylinders that  
mate with No. 600 valve connection.  
CAUTION: After turning heater off, wire guard will  
remain hot. Allow to thoroughly cool before storing.  
Do not operate, store or remove cylinder near  
flammable items or ignition sources.  
• LP-GAS CYLINDERS MUST BE DISCONNECTED  
FROM HEATER WHEN NOT IN USE!  
Heater and attached cylinder must be in an upright  
position during operation.  
Make sure four-position Control Knob is in “OFF”  
position; see Figure 1.  
LIGHTING / OPERATING INSTRUCTIONS  
FOR USE WITH HOSE CONNECTED TO A  
REMOTE CYLINDER, MAXIMUM SIZE 20  
LBS:  
This Heater may be used in a Recreational Enclo-  
sure 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 No. F273701,  
F273702 or F272702 and fuel filter F273699. Fuel  
filter must be replaced annually.  
DANGER: NEVER bring a refillable propane cylinder  
indoors. A fire or explosion can occur causing  
property damage, serious injury or death!  
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 No’s. shown above.  
Figure1  
Screw 1 lb. disposable LP-gas supply cylinder clockwise  
(from bottom) into portable heater until hand-tight.  
The propane cylinder must include a listed overfilling  
protection device as well as a collar to protect the  
cylinder valve.  
Check cylinder connection for leaks with soapy water at  
the threaded connection under the domed plastic cover  
where the cylinder screws into the regulator. SEE  
WARNING! ON PLASTIC COVER.  
Heater must be in an upright position during opera-  
tion.  
Make sure four-position Control Knob is in “OFF”  
position; see Figure 1, at left.  
Depress and turn Control Knob counterclockwise to  
“PILOT” position and hold for 30-60 seconds.  
Screw hose connector into regulator on heater and  
screw connector on other end of hose into LP-gas  
supply cylinder valve. Tighten all hose connections.  
• Mr. Heater strongly recommends using disposable  
fuel filter F273699 to trap any oil substances when  
connected to a remote cylinder that can make  
heater inoperable.  
Depress red spark ignition button to light pilot flame  
(repeat until pilot lights) and continue to hold Control  
Knob down and at “PILOT” position for 30-60  
seconds to enable Pilot Light Safety System.  
After lighting pilot, release knob. Knob should return  
to fully extended position. To operate heater slightly  
depress knob and gently turn to lock in desired  
position.  
Open valve at LP-gas supply cylinder.  
Check all hose connections for leaks with soapy  
water at the threaded connection under the domed  
plastic cover where the hose connector screws into the  
regulator and at LP-gas supply cylinder. SEE WARNING!  
Fully turn Control Knob to “HI” position to light  
burner tile. Leave on “HI” position until burner tile  
turns bright orange.  
Mr. Heater | Portable Buddy  
Operating Instructions and Owner’s Manual  
4
 
Depress and turn Control Knob counterclockwise to  
“PILOT” position and hold for 1 - 2 minutes. This may  
take longer to purge air from the supply hose depending  
on the length of the hose being used.  
Depress red spark ignition button to light pilot flame  
(repeat until pilot lights) and continue to hold Control  
Knob down and at “PILOT” position for 30-60 seconds  
to enable Pilot Light Safety System.  
After lighting pilot, release knob. Knob should return to  
fully extended position. To operate heater slightly  
depress knob and gently turn to lock in desired position.  
Fully turn Control Knob to “HI” position to light burner  
tile. Leave on “HI” position until burner tile turns bright  
orange.  
After burner tile has turned bright orange, adjust heat  
output by turning Control Knob to desired position  
(“LO” or “HI” setting).  
Figure 2  
A slight yellow flame may occur where the pilot flame and main  
burner flame meet. The burner should be bright orange (with a  
slight blue color around the border, a red-orange haze that is  
visible on the ceramic tile is acceptable) and without a noticeable  
flame. A blue flame that rolls out at the top of the ceramic tile  
indicates an accumulation of dust, lint or spider webs inside the  
casing assembly and main burner assembly. If the pilot is yellow or  
the burner has a noticeable flame, cleaning may be required. Use  
the following procedure to inspect the casing assembly and main  
burner assembly.  
Caution: Do not try to adjust heating levels by using  
the propane tank shut off valve.  
Warning:  
DO NOT OPERATE HEATER UNLESS CONTROL KNOB IS  
LOCKED IN A POSITION MARKED “HI”, “LO” or  
“PILOT”.NEVER SET CONTROL KNOB BETWEEN LOCKED  
POSITIONS. POOR COMBUSTION AND HIGHER LEVELS  
It is necessary to periodically check the burner orifice and burner  
venturi tube to make sure they are clear of insects/nests or spider  
webs that may accumulate over time. A clogged tube can lead to  
a fire.  
OF CARBON MONOXIDE MAY RESULT.  
To shut off heater, shut off propane at supply tank,  
allow heater to use-up propane in supply line until  
heater shuts off, then slightly push down and turn  
Control Knob clockwise to “OFF” position.  
1 Allow heater to thoroughly cool before performing any  
maintenance.  
CAUTION: After turning heater off, wire guard will  
remain hot. Allow to thoroughly cool before storing.  
2 Remove disposable 1 lb. cylinder from heater or turn OFF  
gas supply at remote cylinder valve, and disconnect hose  
from heater.  
When not in use, the gas must be turned off at the LP-  
gas supply cylinder. As stated before allow heater to use  
up propane in supply line until heater shuts off. When  
the LP-gas supply cylinder is not disconnected from the  
heater, the heater and the cylinder must be stored  
outdoors, in a well ventilated space, out of reach of  
children, and must not be stored in a building, garage or  
any other enclosed area.  
3 Remove wire guard from front of heater by gently  
bending to remove from holes in front cover.  
4 Remove (1) burner assembly retaining screw from  
bottom of the heater.  
5 Pull burner assembly from front of the heater.  
Indoor storage of the heater is permissible only if the  
cylinder is disconnected and removed from the heater.  
Cylinders must be stored outdoors out of the reach of  
children and must not be stored in a building, garage or  
any other enclosed area.  
6 Inspect interior of casing assembly for accumulation of  
dust, lint or spider webs. If necessary, clean interior of  
casing assembly with a vacuum cleaner or apply air  
pressure. Do not damage any components within casing  
assembly when you are cleaning.  
7 Inspect and clean main burner orifice (mounted to pilot  
bracket with jam nut) by using a vacuum or apply air  
pressure at orifice opening.  
MAINTENANCE:  
Always keep the heater area clear and free from combustible  
materials, gasoline and other flammable vapors and liquids.  
Keep the vent areas (slots in the bottom and the top at the front  
of heater) clear at all times.  
Visually inspect the pilot flame and burner periodically during use.  
The pilot flame should be blue in color (not yellow) and will extend  
beyond the thermocouple. The flame will surround the  
thermocouple just below the tip, see Figure 2.  
8 Inspect and clean pilot (mounted to bracket) by using a  
vacuum or apply air pressure through the holes in the  
pilot indicated by the arrows in Figure 2.  
WARNING: Never use needles, wires, or similar cylindri-  
cal objects to clean the pilot to avoid damaging the  
Mr. Heater | Portable Buddy  
Operating Instructions and Owner’s Manual  
05/12/06 73432CAL Rev. L1  
5
 
calibrated ruby that controls the gas flow.  
PARTS LIST:  
SEE BACK PAGE FOR PARTS ORDERING INFORMATION  
9 Apply air pressure (max. 30 psi.) into ceramic tile of  
burner assembly and the venturi tube (with cone on  
end, ref. item #21) to remove dust, lint or spider webs.  
REF. #  
ITEM #  
DESCRIPTION  
1 ............. 73234 ......... PIEZO IGNITER  
2 ............. 73236 ......... WIRE, IGNITER  
3 ............. 73237 ......... WIRE, GROUND  
4 ............. 73405 ......... COVER, RH PLASTIC  
5 ............. 73418 ......... KNOB, FUEL CONTROL  
6 ............. 73423 ......... COVER, FRONT  
7 ............. 73424 ......... COVER, REAR  
8 ............. 73426 ......... COVER, LH PLASTIC  
9 ............. 73428 ......... (2) BASE SUPPORT TUBES  
10 ........... 73449P ....... GUARD, WIRE  
11 ........... 73452 ......... HANDLE TUBE  
12 ........... 98959 ......... SCREW, BURNER MT.  
13 ........... 11409 ......... REGULATOR  
10 Make sure the burner tile assembly is completely seated  
against the reflector.  
11 Carefully slide burner assembly back into casing assem-  
bly making sure to center reflector flange with the  
casing opening and hold in place while installing burner  
assembly screw in the bottom of the heater.  
12 Install wire guard by gently bending and inserting into  
the (4) holes in the front cover.  
TROUBLESHOOTING INFORMATION:  
If Spark electrode does not produce spark.  
CHECK  
Spark electrode broken – replace.  
Igniter wire may not be attached to spark  
electrode, ground wire may not be attached  
to frame - attach.  
Igniter wire damaged – replace.  
14 ........... 73432 ......... OWNER’S MANUAL  
(Required when ordering parts.)  
Piezo igniter defective – replace.  
If Spark electrode produces spark but pilot does not light.  
CHECK  
15 ........... 73416 ......... CONTROL VALVE  
No gas to heater – install disposable  
cylinder or connect hose and turn on valve  
at remote cylinder.  
17 ........... 73499 ......... PILOT ODS / TIP SWITCH ASSEMBLY  
18 ........... 73413 ......... ORIFICE, BURNER  
“PILOT” position not properly aligned – turn  
gas control knob to “PILOT” position and  
depress.  
19 ........... 71113 ......... O-RING, BURNER ORIFICE  
20 ........... 73446 ......... COMPLETE BURNER ASSEMBLY  
(Includes assembled items 21- 25)  
Pilot is blocked from spider web or dirt –  
clean pilot, see MAINTENANCE.  
If Pilot flame does not stay lit when knob is released.  
CHECK  
21 ........... 73458 ......... PLENUM, BURNER  
22 ........... 73429 ......... (2) CLIP, BUNER TILE  
23 ........... 73433 ......... GASKET, BURNER TILE  
24 ........... 73439 ......... BURNER TILE  
Control knob in “PILOT” position not  
completely depressed or held in long  
enough to purge air from lines.  
Pilot flame not surrounding thermocouple –  
clean pilot, see MAINTENANCE.  
Pilot Assembly defective – replace.  
25 ........... 73460 ......... REFLECTOR, BURNER  
26 ........... 73422 ......... REGULATOR HOLD DOWN  
Tip switch wires disconnected – connect.  
If Main burner does not ignite.  
CHECK  
ACCESSORIES:  
Main burner orifice is blocked – clean  
burner, see MAINTENANCE.  
ITEM # DESCRIPTION  
F273701 5 ft. PROPANE HOSE ASSEMBLY (Swivel  
1”-20Male Throwaway Cyl. Thd. X P.O.L. w/  
Handwheel)  
If Heater keeps shutting “OFF” during normal operation.  
CHECK  
Pilot is blocked – clean pilot, see  
MAINTENANCE.  
F273702 12 ft. PROPANE HOSE ASSEMBLY  
(Swivel 1”-20Male Throwaway Cyl. Thd. X  
P.O.L. w/Handwheel)  
Provide minimum fresh air opening of 9  
square inches (example 3” x 3” opening).  
Tip over switch activated from bumping  
heater. Re-light  
F272702 12 ft. PROPANE HOSE ASSEMBLY  
(Swivel 1”-20Male Throwaway Cyl. Thd. X  
P.O.L. w/Handwheel)  
F273699 Fuel Filter (Replace Annually)  
Mr. Heater | Portable Buddy  
Operating Instructions and Owner’s Manual  
6
 
Mr. Heater • Portable Buddy • Model # MH9B  
ExplodedBuddy_rev a.ai  
Mr. Heater | Portable Buddy  
Operating Instructions and Owner’s Manual  
05/12/06 73432CAL Rev. L1  
7
 
Model #  
MH9B  
OPERATING INSTRUCTIONS  
AND OWNER’S MANUAL  
WARNING:  
USE ONLY MANUFACTURER’S REPLACEMENT PARTS. USE OF ANY OTHER PARTS  
COULD CAUSE INJURY OR DEATH. REPLACEMENT PARTS ARE ONLY AVAILABLE  
DIRECT FROM THE FACTORY AND MUST BE INSTALLED BY A QUALIFIED SERVICE  
AGENCY. MR. HEATER HOSES F273701, F273702 AND F272702 ARE SPECIFICALLY  
DESIGNED FOR USE WITH THIS HEATER ALONG WITH F273699 DISPOSABLE FUEL  
FILTER (REPLACE ANNUALLY). USE OF OTHER HOSES MAY CAUSE THE HEATER TO  
BECOME INOPERABLE.  
PARTS ORDERING INFORMATION:  
PURCHASING: Accessories may be purchased at any Mr. Heater local dealer or direct  
from the factory  
FOR INFORMATION REGARDING SERVICE  
Please call Toll-Free 800-251-0001  
Our office hours are 8:30 AM – 5:00 PM, EST, Monday through Friday.  
Please include the model number, date of purchase, and description of problem in all  
communication.  
LIMITED WARRANTY  
Enerco Group, Inc. warrants its heaters and accessories to be free from defects in  
material and workmanship for a period of 1 year from date of purchase. Enerco  
Group, Inc. will repair or replace this product free of charge if it has been proven to  
be defective within the 1-year period, and is returned at customer expense with  
proof of purchase to Enerco Group, Inc. within the warranty period.  
Enerco Group, Inc. reserves the right to make changes at any time, without  
notice or obligation, in colors, specifications, accessories, materials and  
models.  
ENERCO GROUP, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000  
Mr. Heater and Portable Buddy are registered trademarks of Enerco Group, Inc.  
© 2003, Enerco/Mr. Heater. All rights reserved  
CSA 4.98  
U.S.  
Mr. Heater | Portable Buddy  
Operating Instructions and Owner’s Manual  
05/12/06 73432CAL Rev. L1  
8
 

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