MrHeater MR HEATER MH4B Assembly instructions

www.mrheater.com 800-251-0001 2017 15175 CAN - CB
PORTABLE PROPANE HEATER FOR
RECREATIONAL AND COMMERCIAL USE
For Canada Sale
CARBON MONOXIDE HAZARD
This appliance can produce carbon
monoxide which has no odor.
Using it in an enclosed space can kill
you.
Never use this appliance in an
enclosed space such as a camper,
tent, car or home.
DANGER FOR YOUR SAFETY
If you smell gas:
1. Do not attempt to light appliance.
2.Extinguish any open flames.
3.Disconnect from fuel supply.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
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 RADIANT
BUDDY HEATER MH4B
Model #
LANGUAGES INCLUDED:
•ENGLISH
Use only Mr. Heater branded accessories
(See page 8 for WARNING information)

Mr. Heater MH4B Canada 22016 15125 CB
SPECIFICATIONS
MODEL NO. ...................................................... MH4B
GAS TYPE ......................................................PROPANE
INPUT BTU/HR. ...................................................3,800
CLEARANCE TO COMBUSTIBLES
TOP .......................................................................
FRONT ....................................................................
SIDES ......................................................................
REAR .......................................................................
CONTENTS
General Safety Instructions ............................................... 3
General Information .......................................................... 3
Operating with Disposable Propane Cylinders ................... 4
Maintenance..................................................................... 4
Troubleshooting ................................................................ 5
Parts List ........................................................................... 6
Parts Ordering Information ............................................... 8
Service Information ........................................................... 8
WARNING:
Every time hose or tank is connected to unit, connection must be checked for leaks in one or more ways: Apply soapy
water to connection, look for bubbles, listen for hiss of escaping gas, feel for extreme cold, smell for rotten egg odor. Do
not use if leaking!
THE STATE OF CALIFORNIA REQUIRES THE FOLLOWING WARNINGS:
WARNING: Combustion by-products produced when using this product contain carbon monoxide, a chemical
known to the State of California to cause cancer and birth defects (or other reproductive harm).
WARNING:
Early signs of carbon monoxide poisoning resemble the
flu, with headache, dizziness and/or nausea. If you have
these signs, heater may not be working properly. Get
fresh air at once! Have heater serviced.
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects
or other reproductive harm.
WARNING:
Any changes to this heater or its controls can be
dangerous.
NOTICE:

32016 15125 CB
Do not use non-approved attachments on this heater.
Due to high temperatures, the appliance should be
located out of traffic and away from combustible materi-
als.
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 is for outdoor use only.
GAS PRESSURE AT HEATER IS REGULATED AND FIXED
REGULATOR IN HEATER MUST ALWAYS BE IN PLACE
DURING OPERATION.
Any safety screen or guard removed for servicing the ap-
pliance must be replaced prior to operating the heater.
The appliance should be inspected before each use.
Frequent cleaning may be required. The control com-
partments, burner and circulating air passageways of
the appliance must be kept clean, see MAINTENANCE.
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 wa-
ter.
When used without adequate combustion and ventila-
tion air, this heater may give off excessive CARBON
MONOXIDE, an odorless, poisonous gas.
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 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 HEAT-
ER OFF IF THE HEATER TIPS OVER HOWEVER, DO NOT
LEAVE HEATER UNATTENDED OR WHERE CHILDREN
MAY CAUSE THE HEATER TO TIP OVER. NEVER OPERATE
THE HEATER WHILE SLEEPING!
Do not leave this appliance unattended while it is in
operation.
GENERAL SAFETY INSTRUCTIONS
THIS IS A HEATING APPLIANCE. DO NOT OPERATE
THIS APPLIANCE WITHOUT THE FRONT WIRE GUARD
INSTALLED. DO NOT ATTEMPT TO WARM OR COOK
FOOD ON THIS HEATER.
GENERAL INFORMATION:
When the heater is cold, it will take a few minutes for
the burner tile to turn bright orange. This is normal and
the heater is working properly. If burner tile is visibly
flaming, turn heater off and call a qualified service tech-
nician.
When the unit is lit, there should be about a quarter
inch border around the tile that will not turn bright
orange. This is normal.
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.
Designed to operate at altitudes up to 7,000 feet. 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. If the heater continues to shut
off, there may not be enough oxygen available to feed
proper combustion.
Operating time will be approximately 5 1/2 hours on
a one 1lb cyclinder. Due to the properties of LP gas,
runtimes can be significantly reduced when operating
This heater is equipped with a tip-over safety switch.
Nuisance shut-downs may be experienced if the unit
is bumped or moved. if this occurs simply relight the
heater.
• Due to natural operation of small tanks, condensation
may build up on tank and drip on surface under heater.
Sometimes this condensation may freeze due to the
extreme cold caused when propane vaporizes. This is
normal and no reason for alarm.

Mr. Heater MH4B Canada 42016 15125 CB
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 housing 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. It
is necessary to periodically check the burner orifice and
burner venturi to make sure that they are clear of insects/
nests or spider webs that may accumulate over time. A
clogged tube can lead to a fire.
CLEANING INSTRUCTIONS:
1. Allow heater to thoroughly cool before performing
any maintenance.
2. Remove disposable 1 lb. propane cylinder from
heater.
3. Remove right side plastic service panel (ref.5) by
removing the six screws holding it in place.
4. Inspect the interior of casing for accumulation of
dust, lint or spider webs. If necessary, clean the
interior of the casing assembly with a vacuum cleaner
or compressed air (max 30 psi). Do not damage any
components within the casing assembly when you
are cleaning.
5. Inspect and clean main burner (ref. 13) and orifice
(ref. 3) by using a vacuum or compressed air (max 30
psi).
6. Inspect and clean pilot tube (ref. 14). Insert a
doubled over pipe cleaner into the pilot tube until
it bottoms against the pilot orifice (approximately
and remove. Blow out the remaining debris using
compressed air.
LIGHTING / OPERATING INSTRUCTIONS
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!
LP cylinders must be marked in accordance with
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.
Heater and attached cylinder must be in an upright
position during operation.
Screw 1 lb. disposable LP-gas supply cylinder clockwise
(from bottom) into portable heater until hand-tight and
fit cylinder into stand. Do not use thread sealant on this
connection.
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.
pilot lights) and continue to hold for 30-60 seconds.
• 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.
HEATER WHEN NOT IN USE!
liquids during ignition or operation.
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 top of the
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 to the thermocouple. The flame will
surround the thermocouple just below the tip, see Figure 2.
Pilot Flame
Oxygen Depletion Sensor
Figure 2

52016 15125 CB
WARNING: Never use needles, wires or similar cylindrical
objects to clean the pilot to avoid damaging the
calibrated ruby that controls the gas flow through the
pilot orifice.
7. Apply compressed air (max 30 psi) into the ceramic
tile of burner assembly and venturi tube (ref. 13) to
remove dust, lint and spider webs.
8. Reinstall the right side plastic service panel.
TROUBLESHOOTING INFORMATION:
If Spark electrode does not produce spark.
CHECK
electrode. -- attach
assembly.
If Spark electrode produces spark but pilot does not light.
CHECK
cylinder.
pilot, see MAINTENANCE.
If Pilot flame does not stay lit when button is released.
CHECK
to purge air from line.
clean pilot, see MAINTENANCE.
•
tip switch (check off switch and off switch
wiring).
If Main burner does not ignite.
CHECK
see MAINTENANCE.
If Heater keeps shutting “OFF” during normal operation.
CHECK
MAINTENANCE.
Re-light
—INTENTIONALLY LEFT BLANK —

Mr. Heater MH4B Canada 62016 15125 CB
Mr. Heater MH4B

72016 15125 CB
NOTES:
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PARTS LIST:
SEE BACK PAGE FOR PARTS ORDERING INFORMATION
ITEM PART
NO. NUMBER DESCRIPTION
1 15161 Regulator/Valve Assembly 1
2 15151 Orifice 1
3 15163 Off Button Wire 1
4 15126 Left Housing 1
5 15128 Right Service Housing 1
6 15122 On Button 1
7 15123 Off Button 1
8 15165 Off Button Spring 1
9 15124 Tank Base 1
10 15157 Reflector Panel 1
11 15158 Reflector Ring 1
12 15162 Wire Guard 1
13 15135 Burner Assembly 1
14 15155 ODS/Pilot Assembly 1
15 15153 Burner Bracket 1
16 15145 Off Switch 1
17 73403 Tipover Switch 1
18 15148 Pilot Fuel Line 1
19 15154 Heat Shield 1
15135

8
Mr. Heater MH4B Canada
ANSI Z21.63-2011 -
CSA.11.3-2011
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 RADIANT
BUDDY HEATER MH4B
Model #
Mr. Heater and Portable Buddy are registered trademarks of Enerco Group, Inc.
© 2017, Enerco/Mr. Heater. All rights reserved
PRODUCT REGISTRATION: Thank you for your purchase.
Please log in to http://www.egiregistration.com to register your product.
Mr. Heater, Inc. reserves the right to make changes at any time, without notice or obligation, in colors, specifications,
accessories, materials and models.
WARNING:
REPLACEMENT PARTS ARE ONLY AVAILABLE DIRECT FROM THE FACTORY AND MUST BE INSTALLED BY A QUALIFIED
SERVICE AGENCY.
WARNING:
NEVER TO BE USED FOR
THE COOKING OR WARMING OF FOODS AS DOING SO CAN INTERFERE WITH THE SAFETY SYSTEMS OF THE
HEATER, WHICH MAY RESULT IN A FIRE, EXPLOSION, THE PRODUCTION OF DEADLY CARBON MONOXIDE, AND
NEVER USE HAND-MADE OR THIRD PARTY ACCESSORIES OR
DEATH TO YOU OR OTHERS.
PARTS ORDERING INFORMATION:
PURCHASING: Accessories may be purchased at any Mr. Heater local dealer or direct from the factory
FOR INFORMATION REGARDING SERVICE
Please call Toll-Free 800-251-0001
www.mrheater.com
Please include the model number, date of purchase, and description of problem in all communication.
LIMITED WARRANTY
Mr. Heater, 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. Mr. Heater, 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 Mr. Heater, Inc. within
the warranty period. DISCLAIMER: This warranty does not cover any product that: a) has been subject to misuse or
including but not limited to using a heater for the cooking or warming of foods; or c) has been used with hand-made or
third party accessories or attachments. This warranty gives you specific legal rights, and you may also have other rights
which vary from state to state.

www.mrheater.com 800-251-0001 1/16 15175CAN CB
APPAREIL DE CHAUFFAGE PORTATIF AU
COMMERCIAL
À des fins de vente au Canada
PRODUCTION DE MONOXYDE
DE CARBONE
Cet appareil produit du monoxyde de
carbone, un gaz inodore.
endroit fermé risque de causer la mort.
véhicule récréatif, une automobile ou une
maison.
POUR VOTRE SÉCURITÉ
Si vous percevez une odeur de gaz :
chauffage.
POUR VOTRE SÉCURITÉ
appareil.
LISEZ SOIGNEUSEMENT LES INSTRUCTIONS : Lisez et observez toutes les instructions. Conservez les in-
RAYONNANTE PORTABLE
BUDDY CHAUFFE MH4B
DANGER
LANGUES INCLUSES:
•ENGLISH

Mr. Heater MH4B Canada 22016 15125 CB
SPÉCIFICATIONS
....................................................... MH4B
TYPE DE GAZ ................................................PROPANE
PUISSANCE BTU/H..............................................3 800
DESSUS ..............................................................76 cm
AVANT ................................................................61 cm
................................................................15 cm
.............................................................. 0 cm
TABLE DES MATIÈRES
Instructions générales en matière de sécurité .................. F3
Renseignements généraux ............................................... F3
Fonctionnement avec des bouteilles de propane jetables . F4
Entretien ......................................................................... F4
Dépannage ..................................................................... F5
Liste des pièces ............................................................... F6
Information sur la commande de pièces .......................... F8
Information sur le service ................................................ F8
AVERTISSEMENT :
-
AVERTISSEMENT :
Toute modification de cet appareil de chauffage ou
de ses commandes constitue un danger.
AVERTISSEMENT :
de carbone ressemblent aux symptômes de la grippe
AVERTISSEMENT :
L’ÉTAT DE LA CALIFORNIE IMPOSE L’AVERTISSEMENT SUIVANT :
AVERTISSEMENT :
reproduction).
AVERTISSEMENT :
REMARQUEZ :