MrHeater MHBF10NG Quick start guide

Installation instructions and Owner’s Manual
1
UNVENTED NATURAL GAS FIRED ROOM HEATER
Blue Flame Heaters Plaque Heaters
Model # Burn Rate Model # Burn Rate
MHBF10NG/TSBF10NG 10,000 Btu/hr MHIR10NG/TSIR10NG 10,000 Btu/hr
MHBF20/NGT/TSBF20NGT 20,000 Btu/hr MHIR20NGT/TSIR20NGT 20,000 Btu/hr
MHBF30NGT/TSBF30NGT 30,000 Btu/hr MHIR30NGT/TSIR30NGT 30,000 Btu/hr
INSTALLATION 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.
MHIR10NG/
TSIR10NG
ENERCO GROUP, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 · 216-916-3000
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.
- WHAT TO DO IF YOU SMELL GAS
•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 FreshAir 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.
MHIR20NGT/
TSIR20NGT
MHBF30NGT/
TSBF30NGT
MHBF10NG/
TSBF10NG
MHIR30NGT/
TSIR30NGT
MHBF20NGT/
TSBF20NGT
70574 Rev. C 08/05

2Installation instructions and Owner’s Manual 70574 REV. C 8/05
This appliance may be installed in an aftermarket* permanently manufactured (mobile) home, where not prohibited by
local codes.This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not
convertible for use with any other gas.
*Aftermarket completion of sale, not for the purpose of resale, from the manufacturer.
4. Keep all air openings in heater clear, free of debris or
any blockage. This will insure that enough air for
proper combustion enters the heater.
5. If heater shuts off, do not relight until you provide
fresh, outside air. If heater keeps shutting off, it
requires servicing.
6. Turn off and unplug heater and let cool before
servicing. Only a qualified service person should
service and repair heater.
7. Do not run heater:
•Where flammable liquids or vapors are used or
stored
•During dusty conditions.
8. Before using furniture polish, wax, carpet cleaner or
similar products, turn heater off. If heated the vapors
from these products may create a white powder
residue within burner box or on adjacent walls or
furniture.
9. Do not use heater if any part has been underwater.
Immediately call a qualified service technician to
inspect the room heater and to replace any part of
the control system and any gas control which has
beenunderwater.
10.Operating heater above elevations of 4,500 feet
could cause pilot/ODS to shutdown heater.
11.Always run heater with control knob in a locked
position. Never set control knob between locked
positions. Poor combustion and higher levels of
carbon monoxide may result if control knob is left
between locked positions.
DANGER: Carbon monoxide poisoning may lead to
death.
Carbon Monoxide Poisoning:
Early signs of carbon monoxide poisoning resemble the
flu, with headaches, dizziness, or nausea. If you have
these signs, the heater may not be working properly.
Get fresh air at once! Have heater serviced. Some
people are more affected by carbon monoxide than
others. These include pregnant women, persons with
heart or lung disease or anemia, those under the
influence of alcohol, and those at high altitudes.
Natural Gas:
Raw natural gas is odorless. An odor making agent is
added to natural gas, which helps you detect a natural
gas leak. However the odor added to natural gas can
fade. So natural gas may be present even though no
odor is detected. Make certain you read and under-
stand all warnings. Keep this manual for reference. It is
your guide to safe and proper operation of this heater.
WARNINGS
IMPORTANT: Read this owner’s manual carefully
and completely before trying to assembly, operate,
or service this heater. Improper use of this heater
can cause serious injury or death from burns, fire,
explosion, electrical shock, and carbon monoxide
poisoning.
WARNING: Do not use any accessory not ap-
proved for use with this heater.
WARNING: Any change to this heater or its
controls can be dangerous.
•Do not place clothing or other flammable
material on or near the appliance. Never
place any objects on the heater.
•Due to high temperatures, heater should be
kept out of traffic and away from furniture and
draperies.
•Surface of heater becomes very hot when
running. Keep children and adults away from
hot surfaces to avoid burns or clothing ignition.
Heater will remain hot for a time after shut-
down. Allow heater surfaces to cool before
handling.
•Young children should be carefully supervised
when they are in the same room with heater.
•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.
•Keep the appliance area clear and free from
combustible materials, gasoline, and other
flammable vapors and liquids.
PRECAUTIONS:
1. MHBF-10 NG and MHIR-10NG may be installed in a
bedroom, but not a bathroom, or any place where a
strong wind would shut down the appliance.
2. MHBF-20 NGT, MHBF-30 NGT, MHIR-20 NGT and
MHIR-30 NGT may not be installed in a bedroom or
bathroom, or any place where a strong wind would
shut down the appliance.
3. This heater needs outside ventilation air to run
properly. The Oxygen Depletion Sensor (ODS)
safety shutoff system shuts down the heater if not
enough fresh air is available. See Fresh Air for
Combustion and Ventilation, pages 3 through 5.

Installation instructions and Owner’s Manual
3
Product Features
Figure 1
SAFETY DEVICE
This heater has a pilot with an Oxygen Depletion Sensor
(ODS) safety shut off system. The ODS/pilot shuts off
the heater if there is not enough fresh air.
IGNITION SYSTEM
PIEZO: BF10NG / IR10NG – The heater is equipped
with a piezo manual ignitor. This system requires no
matches, batteries, or other source to light heater.
Electronic: BF20NGT/BF30NGT/IR20NGT/IR30NGT –
The heater is equipped with an electronic manual
ignitor. This system requires no matches, or other
source to light heater, but does require one AAbattery to
operateignitor.
To install or replace battery unscrew the ignitor
cap (red button), insert battery and replace cap.
THERMOSTATIC CONTROL ON
THERMOSTAT MODELS
(BF20NGT, BF30NGT, IR20NGT and IR30NGT)
These heaters have a control valve with a thermostat
sensing bulb. This results in the greatest heater comfort
and may result in lower bills.
LOCAL CODES
Install and use heater with care.
Installation must conform to local codes or in the
absences of local codes, use the latest edition of
National Fuel Gas CodeANSI Z223.1/NFPA54.
UNPACKING
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.
FRESH AIR FOR COMBUSTION AND
VENTILATION
WARNING: This heater shall not be installed in a
confined space or unusually tight construction
unless provisions are provided for adequate com-
bustion and ventilation air. Read the following
instructions to insure proper fresh air for this and
other fuel-burning appliances in your home.
ESTABLISHINGADEQUATE VENTILATION
The following are excerpts from National Fuel Gas
Code, NFPA54/ ANSI Z223.1, Section 5.3,Air for
Combustion and Ventilation. All spaces in homes fall
into one of the three following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
This heater must not be installed in a confined space or
unusually tight construction unless provisions are
provided for adequate combustion and ventilation air.
The information on pages 3 through 5 will help you
classify your space and provide adequate ventilation.
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.
Unusually tight construction is defined as construction
where:
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
b. Whether stripping has been added on openable
windows 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.
If you home does not meet all of the three criteria
above, see Determing the Type of Heater Location
Space, page 4.
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 m3per 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
furnished with doors, are considered a part of the
unconfined space.
Ignitor Button Control Knob
Grill
Front Panel
Burners
Heater
Cabinet

4Installation instructions and Owner’s Manual 70574 REV. C 8/05
*Adjoining rooms are communication only if there
are doorless passageways or ventilation grills
between them.
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
install heater plus any adjoining rooms with doorless
passageways or ventilation grills between the
rooms.
1. Find the volume of the space by multiplying room
length x width x height.
Example: Space size 18ft (length) x 18ft. (width) x 8ft.
(height) = 2592
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 in smaller that that defined as an uncon-
fined space or if the building is of unusually tight
construction, provide adequate combustion and
ventilation air by on the methods described in the
National Fuel Gas Code, NFPA54/ ANSI Z223.1,
Section 5.3 or applicable local codes.
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*
*Do not include direct-vent gas appliances. Direct-
vent draws combustion air from the outdoors and
vents to the outdoors.
Example:
Gas water heater 40,000 Btu/hr
Vent Free Heater + 20,000 Btu/hr
Total =60,000 Btu/hr
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)
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.
You must provide additional fresh air. Your options
are as follows:
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 ventila-
tion grills between the rooms. See Ventilation Air
From Inside Building (Fig. 2).
B. Vent room directly to the outdoors. See Ventilation
Air From Outdoors (Fig. 3).
C.Install a lower Btu/hr heater if lower Btu/hr size
makes room unconfined.
If actual Btu/hr used is less than the maximum Btu/
hr the space can support, the space is an uncon-
fined space. You will need no additional fresh air
ventilation.
VENTILATIONAIR
Ventilation from Inside Building
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 adjoining
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.
Figure 2.
WARNING: Rework worksheet, adding the space of
the adjoining unconfined space. The combined
space must have enough fresh air to supply all
appliance in both spaces.
Ventilation
Gills into
Adjoining
Room -
Option 1
Ventilation Gills into
Adjoining Room -
Option 2
12”
12”
Or remove
door into
Adjoining
Room -
Option 3

Installation instructions and Owner’s Manual
5
Figure 3.
Ventilation from Outdoors
If necessary provide extra fresh air by using ventilation
grills or ducts. Connect these items directly to the
outdoors or spaces open to the outdoors. These
include attics* and crawl spaces. Follow the National
Fuel Gas Code NFPA54/ANSI Z223.1, Section 5.3,Air
for Combustion and Ventilation for required size of
ventilation grills or ducts.
*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.
IMPORTANT: Vent-free heaters add moisture to the
air. Although this is beneficial, installing heater in
rooms without enough ventilation air may cause
mildew to form from too much moisture. See Fresh
Air for Combustion and Ventilation, pages 3 through
5.
INSTALLATION
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
system, you may run system’s circulating blower while
using 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.
WARNING: A qualified service person must install
heater. Follow all local codes.
CHECK GAS TYPE
Use only natural gas. If your gas supply is not natural
gas, do not install heater. Call dealer where you bought
heater for proper type heater.
THIS INSTALLATION REQUIRES:
Before installing heater, make sure you have the items
listed below:
•Piping (check local codes)
•Sealant (resistant to natural gas)
•Equipment shutoff valve*
•Ground joint union
•Test gauge connection*
•Sediment trap
•Tee joint
•Pipe wrench
*ACSA/AGAcertified 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. SeeAccessories, page
17.
LOCATING HEATER
This heater is designed to be mounted on the wall. The
heater can also be located on a non-combustible floor,
away from a wall by using the floor mounting stands
included with the heater. If installed on combustible
flooring such as carpeting, tile or other combustible
material other than wood flooring, the heater must be
placed on a wood panel the full width and depth of the
appliance.
For convenience and efficiency, install the heater:
•Where there is easy access for operation,
inspection, and service
•In the coldest part of the room.
•If planning to use fan, locate heater near an
electrical outlet.
CAUTION: If you install the heater in a home garage:
Heater pilot and burner must be at least 18 inches
above floor. Located 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. Installing heater next to vinyl or cloth wall
covering or operating heater where impurities (such as
tobacco smoke, aromatic candles, cleaning fluids, oil or
kerosene lamps, etc.) are present in the air may
discolor walls.
WARNING: Never install the heater:
• In a bathroom.
• In a bedroom (IR20NGT, IR30NGT, BF20NGT
or BF30NGT)
• 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: Heater must be mounted to maintain
the minimum clearances shown in Figure 4. If
possible, provide greater clearances from the floor,
ceiling, and joining walls.
INLET
AIR
OUTLET
AIR
VENTILATION CRAWL SPACE
TO CRAWL
SPACE
TOATTIC
12345
1
234
5
12345
12345
1
234
5
12345
12345
1
234
5
12345
12345
1
234
5
12345
12345
1
234
5
12345
12345678
12345678
12
12
12
12
12
12
12
12
12
VENTILATIONAIR
VENTILATED
ATTIC
12345
12345
OUTLETAIR

6Installation instructions and Owner’s Manual 70574 REV. C 8/05
Figure 4
FASTENING HEATER TO WALL
Mounting Bracket
The mounting bracket in located on the back panel of
heater (see figure 5). It has been taped there for ship-
ping. Remove mounting bracket from back panel.
Figure 5
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 6
Attaching Mounting Bracket to Wall
Use holes on each end of mounting bracket to attach
bracket to wall. These holes are 16 inches apart.
Attach mounting bracket to wall in one of two following
ways.
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.
Attaching to Wall Anchor:
This way allows you to attach mounting bracket to
hollow 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.
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.
WARNING: Maintain minimum clearances shown in
figure 8. If you can, provide greater clearances
from the floor and joining wall.
2. Mark screw locations on wall (see figure 7).
3. Remove tape and mount bracket from wall.
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.
4. Tighten screws until mounting bracket is firmly
fastened to wall studs.
Attaching to Wall using Anchor:
For attaching mounting bracket to hollow walls (wall
areas between studs) or solid walls (concrete or ma-
sonry)
Note: Wall anchors, mounting screws, and spacer
are in hardware package. The hardware package is
provided with heater.
Adjoining Wall
12345678901234567890123456789012
12345678901234567890123456789012
12345678901234567890123456789012
12345678901234567890123456789012
12345678901234567890123456789012
17-1/2” Min.
6-1/2” Min. 10,000 BTU
10-1/4” min 20,000-30,000 BTU
16” (Lg)
12-9/64” (Sm)
Mark mounting hole locations
and drill holes where indicated.
Allow for minimum clearances
Left
Side Right
Side
36” min.
from ceiling
6” Min from
adjoining
walls
2” min. to top surface of carpet,
tile or other combustible material
Floor
Mounting
Bracket

Installation instructions and Owner’s Manual
7
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.
Figure 8.
3. Insert wall anchor (wings first) into hole. Tap
anchor flush to wall.
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.
6. Insert mounting screws through bracket and
into wall anchors.
7. Tighten screws until mounting bracket is firmly
fastened to wall.
Placing Heater on Mounting Bracket
1. Locate two horizontal slots on back pane of
heater (see figure 9).
2. Place heater onto mounting bracket. Slide
horizontal slots onto stand-out tabs on mounting
bracket.
Figure 9.
Installing Bottom Mounting Screws
1. Locate two bottom mounting holes. These
holes are near bottom on back panel of heater
(see figure 10).
Figure 10
2. Mark screws locations on wall.
3. Remove heater from mounting bracket.
4. If installing bottom mounting screw into hollow
or solid wall, install wall anchors. Follow steps 1
through 4 underAttaching to Wall usingAnchor.
If installing bottom mounting screw into wall
stud, drill holes at marked locations using 9/64”
drill bit.
5. Re-place heater onto mounting bracket.
6. Place spacers between bottom mounting holes
and wall anchor or drilled hole.
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.
8. Tighten both screws until heater is firmly
secured 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.
FLOOR MOUNTING AWAY FROM WALL:
Figure 11
Installing Support Feet (see figure 11)
1. Lay heater onto table on its back with bottom
edge overhanging table edge.
2. Securely attach feet to bottom of heater using 2
– self-tapping screws each.
Note: Feet should have long end going out the front
of heater, and the edge coinciding with side of
heater. If feet overhang side of the heater, switch
leg location.
3. Place heater on non-combustible surface (see
Locating Heater above) before proceeding with
gas connection. If this will be a permanent
location, heater may be locked into position
using anchoring holes in mounting feet.
Note: Use of floor mounting feet will require you to
use a 3/8 NPT street elbow to make gas connec-
tion.
CONNECTING TO GAS SUPPLY
WARNING: Aqualified service person must connect
heater to gas supply. Follow all local codes.
Horizontal Slots
Mounting Bracket
mounted to wall

8Installation instructions and Owner’s Manual 70574 REV. C 8/05
WARNING: This appliance requires a 3/8” NPT
(National Pipe Thread) inlet connection to the
pressure regulator. Use of floor mounting feet will
require you to use a 3/8 NPT street elbow to make
gas connection.
CAUTION: Never connect heater to private (non-utility)
gas well. This gas is commonly known as well-head
gas.
IMPORTANT: Check your gas line pressure before
connecting heater to gas line. Gas line pressure must
be no greater than 14 inches of water. If gas line
pressure is higher, heater regulator damage could
occur.
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.
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 upstream
from heater (see figure 12).
Figure 12
*ACSA/AGAcertified equipment shutoff valve with 1/8”
NPT tap is an acceptable alternative to test gauge
connection. Purchase the CSA/AGA certified equip-
ment shutoff valve from your dealer. See Accessories,
page 17.
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.
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.
CAUTION: Use pipe joint sealant that is resistant to
natural gas.
Install sediment trap in supply line as shown in figure
12. Locate sediment trap where it is within reach for
cleaning. Asediment trap traps moisture and contami-
nants. 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.
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.
PRESSURE TESTING GAS SUPPLY PIPING
SYSTEM
Test pressure in Excess of ½ psig (3.5kPa)
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.
2. Cap off open end of gas pipe where equipment
shutoff valve was connected.
3. Pressurize supply piping system by either using
compressed air or opening main gas valve on
or near gas meter.
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.
5. Correct all leaks at once.
6. Depressurize and relieve pressure in supply
piping system.
7. Reconnect heater and equipment shutoff valve
to gas supply.
8. Reconnected fittings must be checked for leaks
in next section.
Test Pressure Equal To or Less Than ½ psig (3.5 kPa)
1. Close equipment shutoff valve (see figure 13).
2. Pressurize supply piping system by either using
compressed air or opening main gas valve on
or near gas meter.
3. Check all joints from the gas meter to equip-
ment shutoff valve (see figure 14).Apply
mixture of liquid soap and water to gas joints.
Bubbles forming show a leak.
4. Correct all leaks at once.
5. Depressurize and relieve pressure from supply
piping system.
Pressure
Regulator
Heater
Cabinet
Ground Joint Union
Equipment
Shutoff Valve
From Gas Meter
(4” W.C. to 10.5”
W.C. Pressure)
Tee Joint
1/8” NPT Plug Tap
Cap
Pipe Nipple
Tee Joint
3/8” NPT Pipe Nipple
Sediment
Trap
Test Gauge
Connection
Reducer Bushing
to 1/8” NPT
3” Minimum

Installation instructions and Owner’s Manual
9
Pressure Testing Heater Gas Connections:
1. Make sure that the heater supply piping system
is connected and has been leak tested as
described above.
2. Make sure control knob of heater is in OFF
position.
3. Open equipment shutoff valve (see figure 13).
4. Open main gas valve on or near gas meter.
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.
6. Correct all leaks at once.
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.
8. Turn off heater (see To Turn OFF Gas to
Appliance, page 12 for thermostat models and
page 11 for non-thermostat models).
9. Replace lower front panel.
Figure 13
Figure 14
ELECTRICAL WIRING DIAGRAM:
Figure 15
If any original wiring as supplied with the heater must be
replaced, it must be replaced with typeAWG 105oC wire
or its equivalent except as indicated.
WARNING: Electrical Grounding Instructions:This
heater is equipped with a three-prong (grounding)
plug for your protection against shock hazard and
should be plugged into a properly grounded three-
prong receptacle.
OPERATING YOUR HEATER
NON-THERMOSTAT MODELS
MHIR10NG / MHBF10NG / TSIR10NG / TSBF10NG
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not follow these instructions
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
A. This appliance has a pilot that must be lighted
by hand. When lighting the pilot, follow these
instructionsexactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air
and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
•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 can not reach your gas supplier, call the
fire department.
Gas Meter
Control Valve
Equipment
Shutoff Valve
Equipment
Shutoff Valve
Open
Closed

10 Installation instructions and Owner’s Manual 70574 REV. C 8/05
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.
D. Do not use this appliance if any part has been
underwater. Immediately call a qualified service
technician to inspect the appliance and to
replace any part of the control system which
has been underwater.
LIGHTING INSTRUCTIONS
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
clockwise 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.
4. Wait five (5) minutes. Then smell for gas,
including 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.
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.
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.
7. Keep control knob depressed in for ten (10)
seconds after lighting pilot. If pilot goes out,
repeat steps 4, 5, 6 and 7.
•If pilot does not stay lit, refer to Troubleshooting,
pages 14 & 15. Also, contact a qualified service
person or gas supplier for repairs.
•If control knob does not pop up when released,
contact a qualified service person or gas
supplier for repairs.
8. FOR IR10NG: When the pilot is lit, turn the
control knob to “LO” position to light heater.
Leave on “LO” position until first burner tile has
turned bright red.
FOR BF10NG: When the pilot is lit, turn the
control knob to “HI” position to light heater.
9. FOR IR10NG: After first burner tile has turned
bright red, adjust heat output by turning control
knob to desired position (“LO” or “HI”). Do not
operate heater between locked positions.
FOR TSBF10NG: After flame is established (see
Burner Flame Pattern, Page 12) on “HI”, adjust
heat output by turning control knob to desired
position (“LO” or “HI”). Do not operate heater
between locked positions.
Figure 16
Figure 17
CAUTION: Do not try to adjust heating level by using
equipment shutoff valve.
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 18.
IMPORTANT: Release downward pressure while
turning control knob. Control knob must be locked at
the desired position.
Control Knob
LOW
HIGH
OFF
Control Knob
LOW
HIGH
OFF

Installation instructions and Owner’s Manual
11
TO TURN OFF GAS TO APPLIANCE
SHUTTING OFF HEATER:
1. Turn control knob clockwise to the OFF posi-
tion.
2. Turn off all electrical power to the appliance if
servicing is to be preformed.
3. Turn off equipment shutoff valve.
SHUTTING OFF BURNER ONLY (PILOT STAYS LIT)
1. Turn control knob clockwise to the PILOT/IGN
position.
OPERATINGYOUR HEATER
THERMOSTAT MODELS
MHIR20NGT, MHIR30NGT, MHBF20NGT,
MHBF30NGT, TSIR20NGT, TSIR-30NGT,
TSBF20NGT, TSBF30NGT
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not follow these instructions
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
A. This appliance has a pilot which must be lighted
by hand. When lighting the pilot, follow these
instructionsexactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air
and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
•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 can not reach your gas supplier, call the
fire department.
C. Use only your hand to push in or turn the gas
control knob. Never use tools. If 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.
D. Do not use this appliance if any part has been
underwater. Immediately call a qualified service
technician to inspect the appliance and to
replace any part of the control system which
has been underwater.
LIGHTING INSTRUCTIONS
1. STOP! Read the all safety information included
with and on the side of heater.
2. Make sure the equipment shutoff valve is fully
open.
3. Push in gas control knob and slightly turn
clockwise to the OFF position (see figure 19).
4. Wait five (5) minutes. Then smell for gas
including 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.
5. Push in and turn control knob counterclockwise
to PILOT/IGN. Press in control knob 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 19.
6. With control knob pressed in, push down and
release the ignition button. This will light pilot. If
needed keep pressing igniter button until pilot
lights.
7. Keep control knob pressed in for (30) seconds
after lighting pilot. After 30 seconds, release
control knob.
Figure 20
•If pilot does not stay lit, refer to Troubleshooting,
pages 14 & 15. Also, contact a qualified service
person of gas supplier for repairs.
•If control knob does not pop up when released,
contact a qualified service person or gas
supplier for repairs.
Control Knob
Ignitor Button

12 Installation instructions and Owner’s Manual 70574 REV. C 8/05
8. When the pilot is lit, turn control know counter-
clockwise to heating level. The main burner
should light.
9. To select the desired heat level, turn the tem-
perature setting knob counterclockwise to
between 1 & 7.
THERMOSTAT CONTROL OPERATION
FOR IR20NGT / IR30NGT: The thermostatic control
used simply turns on and off the burner.
FOR BF20NGT / BF30NGT: The thermostatic control
used modulates the flame size as the temperature gets
closer to set point, then it turns off the burner upon
reaching temperature.
The burner will cycle back on when room temperature
drops below the set temperature. The control knob can
be set to any heat level between 1 and 7. Selecting the
HI setting will cause the burner to remain on.
Note: The thermostat sensing bulb measures the
temperature of air near the heater cabinet. This may
not always agree with room temperature (depending on
housing construction, insulation location, room size,
open air temperature, etc.). Frequent use of your heater
will let you determine your own comfort levels.
TO TURN OFF GAS TO APPLIANCE
SHUTTING OFF HEATER
1. Turn control knob clockwise to the OFF posi-
tion.
2. Turn off all electrical power to the appliance if
servicing is to be preformed.
3. Turn off equipment shutoff valve.
SHUTTING OFF BURNER ONLY (PILOT STAYS LIT)
1. Turn control knob clockwise to the PILOT/IGN
position.
INSPECTING BURNER
Check pilot flame pattern and burner flame pattern
often.
PILOT FLAME PATTERN
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
Appliance, page 11 for non-thermostat models
or page 12 for thermostat models).
•See Troubleshooting, pages 14 and 15.
Figure 21
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
Appliance, page 11 for non-thermostat models
or page 12 for thermostat models).
•See Troubleshooting, pages 14 and 15.
Figure 23a.
Figure 23b.
Figure 24a.

Installation instructions and Owner’s Manual
13
Figure 24b
CLEANINGAND MAINTENANCE
WARNING: Turn off heater and let cool before
servicing.
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.
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.
WARNING: Failure to keep the primary air
opening(s) of the burner(s) clean may result in
sooting and property damage.
CLEANING ODS/PILOTAND BURNER
•Use as vacuum cleaner, pressurized air or
small soft bristled brush to clean.
CLEANING BURNER PILOTAIR HOLE INLET
We recommend that you clean the unit ever 2,500 hours
of operation or every three months. We also recom-
mend that you keep the burner tube and pilot assembly
clean and free of dust and dirt. To clean these parts we
recommend using compressed air no greater than 30
psig.
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 assem-
bly. In addition, the directions that follow should also be
followed.
1. Shut off the unit, including the pilot. Allow the
unit to cool for at least thirty minutes.
2. Inspect burner and pilot for dust and dirt.
3. Blow air through the port/slots and holes in the
burner.
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 figure
25). With the unit off, lightly blow air through the air inlet
hole. You may blow through a drinking straw if com-
pressed air is not available.
Figure 25
CLEANING HEATER CABINET
Airpassageways
•Use a vacuum cleaner or pressurized air to
clean
Exterior
•Use a soft cloth dampened with a mild soap and
water mixture. Wipe the cabinet to remove
dust.

14 Installation instructions and Owner’s Manual 70574 REV. C 8/05
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
1. Ignitor electrode positioned wrong.
2. ignitor electrode is broken.
3. Ignitor electrode not connected to ignitor.
4. Ignitor cable pinched or wet.
5. Broken ignitor cable.
6. Bad Piezo ignitor.
7. Low Battery.
1. Gas supply turned off or equipment
shutoff valve closed.
2. Control knob not fully pressedin while
pressing ignition button.
3. Air in gas line when installed.
4. ODS/pilot is clogged.
5. Gas regulator setting is not correct
6. Control knob not in pilot position
1. Control knob not fully pressed in.
2. Control knob not presed in long enough
3. Equipment shutoff valve ont fully open
4. Thermocouple connection loose at
control valve
5. Pilot flame not touching thermocouple,
which allows thermocouple to cool,
causing pilot flame to go out. This
problem could be caused by one or both
of the following:
a. Low gas presure
b. Dirty or partially clogged ODS/pilot
6. Thermocouple damaged
7. Control vlave damaged
1. Burner orifice is clogged
2. Burner orifice diameter to small
3. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice is clogged
When ignitor button is pressed
in, there is no spark at pilot
ODS/pilot lights but flame goes
out when control knob is
released
When ignitor button is pressed
in, there is a spark at the ODS/
pilot but no ignition
Burner does not light after
ODS/pilot is lit
1. Reposition electrode
2. Replace electrode
3. Reconnect ignitor cable
4. Free ignitor cable if pinched by any metal
or tubing. Keep ignitor cable dry.
5. Replace ignitor cable
6. Replace control valve (Piezo is part of
control valve on 10K units).
7. Replace battery
1. Turn on gas supply turn off or open
equipment shutoff valve closed
2. Fully press in control knob while pressing
ignition button
3. Continue holding down control knob.
Repeat ignition operation until air is
removed.
4. Clean ODS/pilot (see Cleaning and
Maintenance page 13).
5. Replace gas regulator
6. Turn Control knob to pilot position
1. Press in control knob fully
2. After ODS/pilot lights, keep control knob
pressed in for 30 seconds
3. Fully open equipment shutoff valve
4. Hand tighten thermocouple nut until snug,
and then tighten 1/4 turn more.
5. -
a. Contact local gas company
b. Clean ODS/pilot (see Cleaning and
Maintenance, page ?).
6. Replace thermocouple
7. Replace Control valve.
1. Clean burner orifice (see Cleaning and
Maintenance on page 13), or replace
burner orifice
2. Replace burner orifice
3. Contact local gas company
1. Contact local gas company
2. Clean burner orifice (see Cleaning and
Maintenance on page 13), or replace
burner orifice
Delayed ignition of burner

Installation instructions and Owner’s Manual
15
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.
OBSERVED SYMPTOM POSSIBLE CAUSE REMEDY
TROUBLESHOOTING CON’T
1. Heater burning vapors from paint, hair
spray, glues, etc. See IMPORTANT
statement above
2. Gas leak. See WARNING statement at
top of page.
1. Not enough fresh air is available
2. Low line pressure
3. ODS/pilot is partially clogged
1. Gas leak. See WARNING statement at
top of page
2. Control valve is defective
1. Foreign matter between control valve and
burner
2. Gas leak. See WARNING statement at
top of page
1. Metal expanding while heating or contract-
ing while cooling
1. Not enough combustion/venitlation air
1. Ventilate room. Stop using odor-causing
products while heater is running.
2. Locate and correct all leaks (see Checking
Gas Connections, page 8)
1. Open window and/or door for ventilation
2. Contact local gas company
3. Clean ODS/pilot (see Cleaning and
Maintenance, page 13)
1. Locate and correct all leaks (see Checking
Gas Connections, page 8)
2. Replace control valve
1. Take apart gas tubing and remove foreign
matter
2. Locate and correct all leaks (see Check-
ing Gas Connections, page 8)
1. This is common with most heaters. If noise
is excessive, contact qualified service
person
1. Refer to Fresh Air of Combustion and
Ventilation page 3 through 5
Heater produces unwanted
odors.
Heater shuts off in use (ODS
operates)
Gas odor even when control
knob is in OFF position
Gas odor during combustion
Heater produces a cliking/
ticking noise just after butner is
lit or shut off
Moisture/condensation noticed
on windows
Burner plaque(s) does not glow
[Infrared Only]
Slight smoke or odor during
initial operation
Heater produces a whistling
noise when burner is lit
Buner backfiring during
combustion
1. Burner orifice is clogged or damaged
2. Burner damaged
3. Gas regulator defective
1. Plaque damaged
2. Control knob set between locked posi-
tions.
3. Inlet gas pressure is too low
1. Residues from manufacturing process
1. Turning control knob to HI position when
burner is cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orifice.
1. When heated, vapors from furniture polis,
wax, carpe cleaners, etc., turn into white
powder residue
OBSERVED SYMPTOM POSSIBLE CAUSE REMEDY
1. Clean burner orifice (see Cleaning and
Maintenance on page 13), or replace
burner orifice
2. Replace burner
3. Replace gas regulator
1. Replace buner
2. Turn control knob until it locks at desired
setting.
3. Replace gas regulator
1. Problem will stop after a few hours of
operation
1. Turn control knob to LO position and let
warm up for a minute.
2. Operate buner 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.
1. Turn heater off when using furniture
poils,wax, carpet cleaner or similar
products.
White powder residue forming
within burner box or on
adjacent walls or furniture

16 Installation instructions and Owner’s Manual 70574 REV. C 8/05
SPECIFICATIONS
IR10NG IR20NGT IR30NGT
BTU (Available) 10,000 20,000 30,000
Type of Gas Natural Gas Only Natural Gas Only Natural Gas Only
Ignition Piezo Battery ignitor (1-AA) Battery ignitor (1-AA)
Pressure Regulator Setting 4.5 Inches of Water 4.5 Inches of Water 6.0 Inches of Water
Inlet Gas Pressure (Maximum) 14 Inched of Water 14 Inched of Water 14 Inched of Water
Inlet Gas Pressure (Minimum) 9 Inches of Water 9 Inches of Water 9 Inches of Water
Electrical Rating — 120V, 60Hz, 1 120V, 60Hz, 1
Burners / Orifice nozzles 2 3 4
Thermostatic Control No Yes Yes
Clearances: inches (mm)
Top 36 (915) 36 (915) 36 (915)
Sides 6 (152) 10.5 (267) 10.5 (267)
Floor (min. to top of carpet) 2 (51) 2 (51) 2 (51)
Fabric / flammable objects 36 (915) 36 (915) 36 (915)
BF10NG BF20NGT BF30NGT
BTU (Available) 10,000 20,000 30,000
Type of Gas Natural Gas Only Natural Gas Only Natural Gas Only
Ignition Piezo Battery ignitor (1-AA) Battery ignitor (1-AA)
Pressure Regulator Setting 4.5 Inches of Water 4.5 Inches of Water 4.5 Inches of Water
Inlet Gas Pressure (Maximum) 14 Inched of Water 14 Inched of Water 14 Inched of Water
Inlet Gas Pressure (Minimum) 9 Inches of Water 9 Inches of Water 9 Inches of Water
Electrical Rating — 120V, 60Hz, 1 120V, 60Hz, 1
Burners / Orifice nozzles 1 1 1
Thermostatic Control No Yes Yes
Clearances: inches (mm)
Top 36 (915) 36 (915) 36 (915)
Sides 6 (152) 10.5 (267) 10.5 (267)
Floor (min. to top of carpet) 2 (51) 2 (51) 2 (51)
Fabric / flammable objects 36 (915) 36 (915) 36 (915)

Installation instructions and Owner’s Manual
17
REPLACEMENT PARTS
Note: use only original replacement parts. This will protect you warranty coverage for parts replaced under
warranty.
PARTS UNDER WARRANTY
Contact authorized dealer from whom you purchased 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
•Your address
•Model and serial numbers of your heater
•How heater was malfunctioning
•Type of gas used (Natural Gas)
•Purchase date
Usually, we will ask you to return the defective part to the factory.
PARTS NOT UNDER WARRANTY
Contact authorized dealer of this product. If they can’t supply original replacement part(s), call Enerco
Group, Inc.’s 800# on the back of this manual.
TECHNICALSERVICE
You may have further questions about installation, operation, or troubleshooting, if so, contact Enerco
Group, Inc.’s 800# on the back of this manual.
ACCESSORIES
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.
Equipment Shutoff Valve
For all models, Equipment shutoff valve with 1/8” NPT tap.

18 Installation instructions and Owner’s Manual 70574 REV. C 8/05
Thermostat models
MHIR20NGT, MHIR30NGT, MHBF20NGT, MHBF30NGT,
TSIR20NGT, TSIR30NGT, TSBF20NGT, TSBF30NGT
7
2
20-2
36
39
38
35
16 21
20-1
16-1
16-2
33-2
6
8
26
3029
17
34 24
3-5
22-3
31-1
31-1
19 13 23
18
10
32
12
3-3 3-1
3-2
3-4 11
1-2
1-4
31-3
31-2
22-2
33-1
22-1
25
9
5
1-3
1-1
27-1
28-1
IR20NGT
IR30NGT
4
5
6
15
17
13
14 30
12
2
8
9
7
24
26
23
25
22-1
33-2 22-3
22-1
33-1
20-1
20-2
1-2
1-3
29
1-4
3-1
3-5
1-1 34
3-2
3-6
3-3
11
31-1
31-1
31-2
32
16-1
16-2
16
31-3
27-2
28-2
BF20NGT
BF30NGT

Installation instructions and Owner’s Manual
19
PARTS LIST
Thermostat models
MHIR20NGT, MHIR30NGT, MHBF20NGT, MHBF30NGT,
TSIR20NGT, TSIR30NGT, TSBF20NGT, TSBF30NGT
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.
ITEM PART NO. DESCRIPTION QTY.
IR20NGT BF20NGT IR30NGT BF30NGT
1 70600 70600 70605 70605 Cabinet assembly 1
1-1 70601 70601 70606 70606 Cabinet Top Panel 1
1-2 70603 70603 70603 70603 Cabinet Right Panel 1
1-3 70602 70602 70607 70607 Cabinet back Panel 1
1-4 70604 70604 70604 70604 Cabinet Left Panel 1
2 70608 70608 70609 70609 Lower Front panel assembly 1
3 70610 70616 70622 70626 Reflector Assembly 1
3-1 70611 70617 70623 70627 Reflector Top Panel **
3-2 70613 70618 70624 70628 Reflector Air Channel **
3-3 70614 70619 70614 70629 Reflector Left Panel **
3-4 70612 --- 70625 --- Reflector Bottom Panel **
3-5 70615 70620 70615 70630 Reflector Right Panel **
3-6 --- 70621 --- 70631 Reflector Blue Flame Spacer Panel 1
4 70632 70633 70634 70635 Burner Assembly 1
5 70636 70636 70636 70636 Wall Mounting Bracket 1
6 70637 70637 70637 70637 Thermostat Valve Mounting bracket 1
7 70638 70638 70639 70639 Bezel – Reflector Front 1
8 70640 70640 70640 70640 Thermostat Valve assembly 1
9 70641 70641 70641 70641 Ignitor Module Mounting Bracket 1
10 70642 --- 70643 --- Back Plate 1
11 70644 70644 70644 70644 Ignitor Module, Battery powered 1
12 70681 70681 70681 70681 Heat Switch Bracket 1
13 70338 70338 70356 70338 Pressure regulator 1
14 --- 70646 --- 70648 Glass 1
15 --- 70647 --- 70649 Glass Mounting Bracket 1
16 70339 70339 70339 70339 ODS / Pilot Assembly 1
16-1 part of #16 part of #16 part of #16 part of #16 Thermocouple **
16-2 part of #16 part of #16 part of #16 part of #16 Ignition Electrode **
17 70682 70682 70682 70682 Heat Switch 1
18 70650 --- 70652 --- Gas Manifold 1
19 70651 --- 70651 --- Gas Manifold Mounting Bracket 1
20-1 70653 70654 70653 70654 Burner Mounting Bracket - Right 1
20-2 70653 70654 70653 70654 Burner Mounting Bracket - Left 1
21 70655 --- 70655 --- ODS mounting bracket 1
22-1 70656 70656 70659 70659 Heat Shield – Top 1
22-2 70657 70657 70657 70657 Heat Shield – Right 1
22-3 70658 70660 70661 70662 Heat Shield – Back 1
23 70663 70663 70663 70663 Regulator Mounting Bracket 1
24 70664 70664 70664 70664 Control / ignitor cover 1
25 70665 70665 70665 70665 Floor mount feet 2
26 70666 70666 70667 70667 Grill guard 1
27-1 — — 70668 --- Orifice, 30, IR 4
27-2 — — — 70669 Orifice, 30, BF 1

20 Installation instructions and Owner’s Manual 70574 REV. C 8/05
28-1 70670 — — --- Orifice, 20, IR 3
28-2 — 70671 — — Orifice, 20, BF 1
29 70683 70683 70683 70683 Fan 1
30 70684 70684 70684 70684 Fan motor 1
31-1 70685 70685 70685 70685 Fan Mounting Bracket 2
31-2 70686 70686 70686 70686 Fan Venturi 1
31-3 70687 70687 70687 70687 Fan Cover 1
32 70688 70688 70688 70688 Fan switch 1
33-1 70672 70672 70672 70672 Fan air channel - Left 1
33-2 70673 70673 70673 70673 Fan air channel - Bottom 1
34 70674 70674 70674 70674 Digital Thermometer 1
35 70675 --- 70676 --- Bracket, Top, Plenum, Assembly 1
36 70675 --- 70676 --- Bracket, Bottom, Plenum Assembly 1
37
38 70677 --- 70677 --- Burner Plaques, 30 4
39 70677 --- 70677 --- Burner Plaques, 20 3
40 70678 --- 70678 --- Plaque Gasket, 30 4
41 70678 --- 70678 --- Plaque Gasket, 20 3
* 70680 70680 70680 70680 Power cord 1
* 70679 70679 70679 70679 Strain relief Grommet 1
* 70689 --- 70692 --- Right Burner gas tube 1
* 70690 --- 70693 --- Middle burner gas tube 1
* 70691 --- 70694 --- Left burner gas tube 1
* 70695 70695 70696 70696 ODS Gas Tube Assembly 1
* 70697 70697 70697 70697 Regulator to Thermostat Valve tube Ass’y 1
* 70698 --- 70698 --- Thermostat Valve to Manifold tube 1
* 70341 70341 70341 70341 Ignitor Wire 1
* 70699 --- 70699 --- Gas Manifold Nut 1
* 70342 70342 70342 70342 * Hardware kit 1
* 70343 70344 70345 70346 * CSA/AGA label 1
* 70349 70349 70349 70349 * Gas Instruction decal 1
* 70350 70350 70350 70350 * Inside warning label 1
* 70351 70351 70351 70351 * Thermostat sensing bulb clip 2
** Not sold separately – Must purchase Assembly
* Items not shown
ITEM PART NO. DESCRIPTION QTY.
IR20NGT BF20NGT IR30NGT BF30NGT