BLUE FLAME VENT-FREE
PROPANE/LP GAS GARAGE
HEATER
’
OWNER S OPERATION AND INSTALLATION MANUAL
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 any 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.
ML300HGA
ML300TGA
Installation and service must be performed by a
qualified installer, service agency or gas
supplier.
NON-THERMOSTAT AND
THERMOSTAT MODEL
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.
Table of Contents
Important Safety Information..................................... 2
Fresh Air for Combustion and Ventilation ............... 4
Installation..................................................................... 8
Operating Your Heater............................................... 11
Cleaning&Maintenance.............................................13
Trouble Shooting.........................................................14
Specifications..............................................................17
Illustrate Parts Breakdown ML300TGA .................18
Parts List ML300TGA .................................................19
Illustrate Parts Breakdown ML300HGA .................20
Parts List ML300HGA .................................................21
This appliance may be installed in an aftermar-
ket* permanently located, 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 other
gases.
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.
WATER VAPOR:ABY-PRODUCTOF UNVENTED ROOM
HEATERS
Water vaporis a by-product of gas combustion.An
unvented room heater produces approximately one (1)
ounce (30ml) of water for every 1,000 BTU’s (.3KW’s)
of gas input per hour. Refer to page 3.
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 Air For Combustion
and Ventilation section on page 4 of this
manual.
Installer: Please leave these instructions with
the consumer.
Consumer: Please retain these instructions for
future use.
5 Musick
Irvine
4600 Highlands parkway S.E
SUITE # D/E
CA 92618
*Aftermarket: Completion of sale, not for purpose of
resale, from the manufacturer.
Smyrna, GA 30080
PRO-COM PHONE NUMBER: (877)886-5989
1
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PRODUCT FEATURES
Figure1-Vent-Free Propane/LP Gas Heater(Model ML300TGA Shown)
SAFETY DEVICE
LOCAL CODES
A standard requirement for all vent-free room
heaters. This heater has a pilot with an Oxygen
Depletion Sensor(ODS) safety shutoff system.
The ODS/pilot shuts off the heater if there is
not enough fresh air.
Install and use heater with care. Follow all local
codes. In the absence of local codes, use the
latest edition of National Fuel Gas Code ANSZ223.1,
also known as NFPA 54*.
*Available from :
American National Standards Institute, Inc.
1430 Broadway
PIEZO IGNITION SYSTEM
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
This heater is equipped with a piezo ignitor.
This system requires no matches, batteries, or
other sources to light heater.
Quincy, MA 02269
THERMOSTATIC HEAT
CONTROL ON THERMOSTAT
UNPACKING
1. Remove heater from carton.
MODEL ML300TGA
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.
These heaters have a control valve with a
thermostat sensing bulb. This results in the
greatest heater comfort and may result in
lower gas bills.
WATER VAPOR: A BY-PRODUCT OF UNVENTED ROOM HEATERS
Water vaporis a by-product of gas combustion.An unvented The following steps will help insure that water
room heater produces approximately one (1) ounce (30ml) of vapor does not become a problem.
wter for every 1,000 BTU’s (.3KW’s) of gas input per hour.
1. Be sure the heater is sized properly for the
Unvented room heaters are remommended as supplemental application, including ample combusion air and
heat (a room) rather than a primary heat source (an entire circulation air.
house) .In most supplemental heat application, the water 2. If high humidity is experienced, a dehumidifier
vapor does not create a problem. In most applications, the may be used to help lower the water vapor content
water vapor enhances the low humidity atmosphere of the air.
experience during cold weather.
3. Do not use an unvented room heater as the
primary heat source.
3
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Unusually Tight Construction
The air that leaks around doors and
windows may provide enough fresh
air for combustion and ventilation.
However, in buildings of unusually
tight construction, you must provide
additional fresh air.
Unusually tight construction is
defined as construction where:
a. walls and ceilings exposed to the
Confined and
Unconfined Space
FRESH AIR FOR
COMBUSTION AND
The National Fuel Gas Code
ANS 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 furnished with
doors, are considered a part of
the unconfined space.
VENTILATION
WARNING: This heater
shall not be installed in a
confined space or unusually
tight
provisions are provided for
adequate combustion and
construction
unless
outside
atmosphere
have
a
ventilation air. Read the
following instructions to
insure proper fresh air for this
continuous water vapor retarder
with a rating of one perm (6 10-11 kg
×
per pa-sec-m2)
or less with
and
other
fuel-burning
openings gasketed or sealed and
b. weather stripping has been
added on openable windows and
doors and
appliances in your home.
PRODUCING ADEQUATE
VENTILATION
c. caulking or sealants are applied
to areas such as joints around
window and door frames, between
sole plates and floors, between
wall-ceiling joints, between wall
panels, at penetrations for plumbing,
electrical, and gas lines, and at
other openings. If your home meets
all of the three criteria above, you
must provide additional fresh air.
See Ventilation Air from Outdoors,
page 6.
The following are excerpts from
National Fuel Gas Code. NFPA
54/ANS 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 shall not be installed
in a confined space or unusually
tight construction unless
provisions are provided for
adequate
combustion
and
ventilation air.
Adjoining rooms are
*
communicating only if there are
doorless passageways or
ventilation grills between them.
The information on pages 4
through 6 will help you classify
your space and provide adequate
ventilation.
If your home does not meet all of
the three criteria above, see
Determining Fresh-Air Flow for
Heater Location, page 5.
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if you have a Confined or Unconfined Space*
Use this worksheet to determine if you have a confined or unconfined space.
Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways
or ventilation grills between the rooms.
1. Determine the volume of the space (length width height).
×
×
Length Width Height=
cu.ft. (volume of space)
×
×
Example: Space size 20ft. (length) 16ft( width) 8ft. (ceiling height)=2560cu. ft. (volume of space)
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 determine the maximum Btu/Hr the space can support.
(volume of space)÷50 cu. ft.=(Maximum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space)÷50 cu.ft.=51.2 or 51.200(maximum Btu/Hr the space can support)
WARNING: If the area in which the heater may be operated is smaller than that defined as an
unconfined space or if the building is of unusually tight construction, provide adequate combustion and
ventilation air by one of the methods described in the National Fuel Gas Code, ANS Z223.1, Section 5.3
or applicable local codes.
4
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3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free heater
Gas water healer*
Gas furnace
Vented gas heater
Gas Fireplace logs
Other gas appliances* +
Total
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Example:
Gas water heater
Vent free heater
Total
40,000
20,000
60,000
Btu/Hr
Btu/Hr
Btu/Hr
+
=
=
*Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and
vents to the outdoors.
4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.
Btu/Hr (maximum the space can support)
Btu/Hr (actual amount of Btu/Hr used)
Example : 51,200 Btu/Hr(maximum 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, adding the space of an adjoining room. If the extra space provides an unconfined
space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From
Inside Building, page 5.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6 .
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an
unconfined space. You will need no additional fresh air ventilation.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an
adjoining unconfined space. When
ventilating 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 and 2, Figure 2). You can also
remove door into adjoining room (see
option 3, Figure 2). Follow the National
Fuel Gas Code NFPA 54/ANS Z223.1.
Section 5.3, Air for Combustion and
Ventilation for required size of
ventilation grills or ducts
WARNING: Rework worksheet, add-
ing the space of the adjoining
unconfined space. The combined spaces
must have enough fresh air to supply all
appliances in both spaces.
Figure 2 -Ventilation Air from Inside Building
5
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VENTILATION AIR
Ventilation Air From Outdoors
Provide extra fresh air by using
ventilation grills or duels: You must
provide two permanent openings: one
within 12" of the ceiling and one within
12" of the floor.
Connect these items directly to the
outdoors or spaces open to the outdoors.
These spaces include attics and crawl
spaces. Follow the National Fuel Gas
Code NFPA 54/ANS 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 air into attic if attic has
a
thermostat-controlled power vent.
Figure 3 -Ventilation Air from Outdoors
Heated air entering the attic will activate
the power vent.
INSTALLATION
NOTICE: This heater is
intended for use as supplemental
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 through-
out the house. In the event of a
power outage, you can use this
*A CSA/AGA design-certified
equipment shutoff valve with 1/8"
NPT tap is an acceptable alternative
to test gauge connection. Purchase
the optional CSA/AGA design certi-
fied equipment shutoff valve from
your dealer. See Accessories, page
17.
CAUTION: This heater
creates warm air currents.
These currents move heat
to wall
heater. Installing
next to vinyl or cloth wall
c o v e r i n g s o r o p e r a t i n g
surfaces next to
heater
heater where impurities (such as
tobacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist may
discolor walls.
LOCATING HEATER
This heater is designed to be
mounted on a wall. You can locate
heater on floor, away from a wall.
An optional floor mounting stand is
heater
as
your primary
heat source.
needed. Purchase
the
floor
mounting stand from your dealer.
See Accessories, page 17.
For convenience and efficiency, ꢀ in a bedroom or bathroom.
WARNING: Never install
the heater
WARNING: A qualified
service person must install
heater. Follow all local codes.
install heater
ꢀ
in a recreational vehicle.
ꢀ
where there is easy access for ꢀ where curtains, furniture,
CHECK GAS TYPE
operation, inspection, and service
in coldest part of room
clothing, or other flammable
objects are less than 36 inches
from the front, top, or sides
of the heater.
Use only Propane/LP gas. If your gas
supply is not propane/LP, do not
install heater. Call dealer where you
bought heater for proper type heater.
INSTALLATION NEEDS
ꢀ
An optional fan kit is available from
your dealer. See Accessories,
page 17. If planning to use fan, ꢀ as a fireplace insert.
locate heater near an electrical ꢀ in high traffic areas.
Before installing heater, make sure
you have the items listed below.
outlet.
ꢀ
in windy or drafty areas.
CAUTION: If you install the
heater in a home garage
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
piping (check local codes)
sealant (resistant to propane/LP gas)
equipment shutoff valve*
ground joint union
test gauge connection*
sediment trap
ꢀ
heater pilot and burner must
be at least 18 inches above
floor.
ꢀ
locate heater where moving
vehicle will not hit it.
tee joint
pipe wrench
6
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INSTALLATION
Attaching to Wall Anchor: This
method allows you to attach
mounting bracket to hollow walls
(wall areas between studs) or to
solid walls (concrete or masonry).
Decide which method better
suits your needs. Either method
will provide a secure hold for the
mounting bracket.
FASTENING HEATER TO WALL
Mounting Bracket
The mounting bracket is located on
back panel of heater(see figure 6). It has
been taped there for shipping. Remove
mounting bracket from back panel.
WARNING: Maintain the
minimum clearances shown
in Figure 4. If you can,
provide greater clearances from
floor, ceiling, and joining wall.
Marking Screw Locations
1. Tape mounting bracket to wall
where heater will be located.
Make sure mounting bracket is
level.
Figure 6 -Mounting Bracket
Location
WARNING:
Maintain
minimum clearances shown in
Figure 8. If you can, provide
greater clearances from floor
and joining wall.
Removing Lower Front Panel Of
Heater
1. Remove two screws near bottom
corners of lower front panel
2. Pull bottom of lower front panel
forward, then down (see Figure 7).
Figur 4 -Mounting Clearances As
Viewed From Front Of Heater
2. Mark screw locations on
wall (see Figure 8).
Note: Only mark last hole on
each end of mounting bracket.
Insert mounting screws through
these holes only.
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
3. Remove tape and mounting
bracket from wall.
from too much moisture. See
Fresh Air for Combustion and
Ventilation, page s 4 and 5.
INSTALLING THERMOSTAT
SENSING BULB
For ML300TGA
Figure 7 - Removing Lower Front
Panel Of Heater
1. Pull out the sensing bulb from the
two clips located in the shippng
position according to the direction
as shown by the arrow. There is no
need to take out the two bulb clips.
2. Take out the bulb clip from the
hardware package and insert it into
the square hole and then insert the
sensing bulb into the bulb clip (see
Figure 5).
Methods For Attaching Mounting
Bracket To Wall
Only use last hole on each end of
mounting bracket to attach bracket to
wall. These two holes are 16 inches
apart from their centers.Attach mounting
bracket to wall only in one of two ways:
1. Attaching to wall stud
Model ML300TGA, ML300HGA
Figure 8 - Mounting Bracket
Clearances
2. Attaching to wall anchor
Attaching to Wall Stud: This method
provides the strongest
hold. Insert
mounting screws through mounting
bracket and into wall studs.
Figure 5 - Moving Thermostat
Sensing Bulb
7
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INSTALLATION
Attaching Mounting Bracket To
Wall
IMPORTANT: Do not
hammer
key! For thick walls
(over 1/2" thick) or solid walls,
do not pop open wings.
Note: Wall anchors, mounting
screws, and spacers are in
hardware package. The hardware
package is provided with heater.
Attaching To Wall Stud Method
For attaching mounting bracket to
wall studs
Figure 12 - Installing Bottom
Mounting Screws
1. Drill holes at marked locations
using 9/64" drill bit.
2. Place mounting bracket onto
wall. Line up last hole on each
end of bracket with holes 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 Anchor Method
For attaching mounting bracket to
hollow walls (wall areas between
studs) or solid walls (concrete or
masonry)
2. Mark screw locations on wall.
3. Remove heater from mounting
bracket.
Figure 10 - Popping Open Anchor
Wing For Thin Walls
4. If installing bottom mounting
screws into hollow or solid wall,
install wall anchors. Follow steps
1 through 4 under Attaching
To Wall Anchor Method. If
installing bottom mounting screw
into wall stud, drill holes at
marked locations using 9/64"
drill bit.
5. Replace heater onto mounting
bracket.
6. Place spacers between bottom
mounting holes and wall anchor
or drilled hole.
5. Place mounting bracket onto
wall. Line up last hole 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 panel of heater (see
Figure 11).
2. Place heater onto mounting
bracket. Slide horizontal slots
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 9 below.
7. Hold spacer in place with
one
hand. With other hand, insert
mounting screw through bottom
mounting hole and spacer. Place
tip of screw in opening of wall
anchor or drilled hole.
onto stand-out
mounting bracket.
tabs
on
8. Tighten both screws until heater
is firmly secured to wall. Do not
over tighten.
ꢀ Note: Do not replace front panel
at this time. Replace front
panel
after
making
gas
connections and checking for
leaks (see pages 9,10).
Figure 9 - Folding Anchor
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. Push red key to
"pop" open anchor wings
(see Figure 10).
Figure 11 - Mounting Heater Onto
Mounting Bracket
Installing Bottom Mounting
Screws
1. Locate two bottom mounting
holes. These holes are near
bottom on
back panel of
heater(see Figure 12).
8
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INSTALLATION
CONNECTING TO GAS SUPPLY
WARNING: qualified
A
service person must connect
heater to gas supply. Follow all
local codes.
WARNING: This appliance
requires a 3/8" NPT (National Pipe
Thread) inlet connection
to the pressure regulator.
CAUTION: Never connect
heater directly to the propane/LP
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 external
regulator will reduce incoming gas
pressure. You must reduce
incoming gas pressure to between
11 and 14 inches of water. If you
do not reduce incoming gas
pressure, heater regulator damage
could occur. Install external
regulator with the vent pointing
down as shown in Figure 13.
Pointing the vent down protects it
from freezing rain or sleet.
Figure 14 -Gas Connection
*A CSA/AGA design-certified equipment shutoff valve with 1/8" NPT tap is
an acceptable alternative to test gauge connection. Purchase the optional
CSA/AGA design-certified equipment shutoff valve from
your dealer. See Accessories, page 17.
Apply pipe joint sealant lightly to
CAUTION: Use only new,
male threads. This will prevent
black iron or steel pipe.
excess sealant from going into
Internally-tinned copper tubing
pipe. Excess sealant in pipe could
may be used in certain areas.
result in clogged heater valves.
Check your local codes. Use pipe
of large enough diameter to
allow proper gas volume to heater.
CAUTION: Use pipe joint
sealant that is resistant to
liquid petroleum (LP) gas.
If
pipe
is
too
small,
undue loss of pressure will occur.
Typical Inlet Pipe Diameters
ML300HGA / ML300TGA 1/2" or
greater
Install sediment trap in supply line
as shown in Figure 14. Locate
sediment trap where it is within
reach
sediment
for cleaning. Locate
trap where trapped
Installation must include an
equipment shutoff valve, union,
and plugged 1/8" NPT tap. Locate
NPT tap within reach for test gauge
hook up. NPT tap must be
upstream from heater (see Figure
14).
matter is not likely to freeze. A
sediment trap traps moisture and
contaminants. This keeps them
from going into heater controls. If
sediment trap is not installed or is
installed wrong, heater may
not run properly.
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.
Figure 13 - External Regulator with
Vent Pointing Down
IMPORTANT:
Hold pressure
regulator with wrench when
connecting it to gas piping and/or
fittings.
9
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OPERATING YOUR HEATER
INSTALLATION
THERMOSTAT MODEL
ML300TGA
CHECKING GAS
CONNECTIONS
Pressure Testing Heater Gas
Connections
1. Open equipment shutoff valve
(see Figure 15).
2. Open propane/LP supply tank
valve.
ꢀFOR YOUR SAFETYꢀ
READ BEFORE LIGHTING
WARNING: Test all gas piping
and connections for leaks after
installing or servicing. Correct all
leaks at once.
WARNING: If you do not
follow
exactly, a fire or explosion may
result causing property
these
instructions
3. Make sure control knob of
heater is in the OFF position.
4. Check all joints from equipment
shutoff valve to control valve
(see Figure 16 ). Apply mixture of
liquid soap and water to gas
joints. Bubbles forming show
a leak.
5. Correct all leaks at once.
6. Light heater (see Operating
Heater, pages 10 and 11 for
thermostat model or page 12
for non-thermostat model).
Check the rest of the internal
joints for leaks.
WARNING: Never use an open
flame to check for a leak. Apply
a
damage, personal injury or
loss of life.
mixture of liquid soap and water
to all joints. Bubbles forming
show a leak. Correct all leaks at
once.
A. This appliance has a pilot which
must be lighted by hand.
When lighting the pilot, follow
these instructions exactly.
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 .
Pressure Testing Gas Supply
Piping System
Test Pressures In Excess Of
1/2 PSIG (3.5 K Pa)
1. Disconnect appliance with its
appliance
main
gas valve
(control valve) and equipment
shutoff valve from gas supply
piping system. Pressures in
excess of 1/2 psig will damage
heater regulator.
7. Turn off heater (see To Turn Off
Gas To Appliance, page 11 for
thermostat model or page
12 for non-thermostat model).
8. Replace lower front panel.
WHAT TO DO IF YOU SMELL GAS
ꢀ
ꢀ
Do not try to light any appliance.
Do not touch any electric switch;
do not use any phone in your
building.
2. Cap off open end of gas pipe
where equipment shutoff valve
was connected.
3. Pressurize
supply
piping
ꢀ
ꢀ
Immediately
supplier from
call
a
your gas
neighbor’s
system by either using
compressed air or opening
propane/LP supply tank valve.
4. Check all joints of gas supply
piping system. Apply mixture of
liquid soap and water to gas
joints. Bubbles forming show
a leak.
phone. Follow
the
gas
supplier’s instructions.
If you cannot reach your
gas supplier, call the fire
department.
Figure 15 -Equipment Shutoff Valve
C. Use only your hand to push in
or turn the gas control knob.
Never use tools. If the 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.
5. Correct all leaks at once.
6. Reconnect heater and equipment
shutoff valve to gas supply. Check
reconnected fittings for leaks.
Test Pressures Equal To or
Less Than 1/2 PSIG (3.5 K Pa)
1. Close equipment shutoff valve
(see Figure 15).
2. Pressurize supply piping system
by either using compressed air
or opening propane/LP supply
tank valve.
3. Check all joints from gas meter
to equipment shutoff valve
(see Figure 16). Apply mixture
of liquid soap and water
to gas joints. Bubbles forming
show a leak.
D. Do not use this appliance if any
part has been under water.
Immediately call
a
qualified
service technician to inspect
the appliance and to replace
any part of the control system
and any gas control which has
been under water.
Figure 16 -Checking Gas Joints
4. Correct all leaks at once.
1 0
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OPERATING YOUR HEATER
ꢀLIGHTINGꢀ
7. Keep control knob pressed in
for thirty (30) seconds after
This increases or decreases the
burner flame height. At times the room
may exceed the set temperature. If so,
the burner will shut off. The burner
will cycle back on when room tem-
INSTRUCTIONS
lighting
pilot.
After
30
1. STOP! Read
the safety
seconds, release control knob.
If control knob does not pop
up when released, contact a
qualified service person or
gas supplier for repairs.
information on the side of
heater.
2. Check that gas supply to
heater is on.
3. Push in gas control knob
slightly and turn clockwise
to the OFF position.
ꢀ
perature drops
below the set
temperature. The control knob can be
set to any heat level between HI and
LO. Selecting the HI setting will cause
the burner to remain fully on without
modulating down in most cases.
NOTE: If pilot goes out, repeat
steps 3 through 7. Wait one (1)
minute before lighting pilot again
NOTE: Knob cannot be turned from
"PILOT" to "OFF" unless knob is
pushed in slightly. Do not
force.
NOTE: the thermostat sensing
bulb
8. Turn
control
knob
to
measures the temperature of air near
the heater cabinet. This may not al-
ways agree with room temperature
(depending on housing construction.
installation location, room size, open
air temperatures, etc.). frequent use of
your heater will let you determine
counterclockwise
desired heating Level. The
main burner should light. Set
control knob to any heat level
between HI and LO.
4. Wait five (5) minutes to clear
out any air. Then smell for
gas, including near the floor.
If
you
smell gas, STOP!
your
own
comfort
levels.
Follow "B" in the safety
information on the side of the
heater. If you do not smell
gas, go to the next step.
ꢀ
TO TURN OFF ꢀ
GAS TO APPLIANCE
5. Push
slightly
counterclockwise
in gas control knob
and turn
to
Shutting Off Heater
1. Turn control knob clockwise
to the OFF position.
Figure 17 - Control Knob in The
OFF Position
"PILOT/IGN" and depress for
five(5) seconds
2. Turn off all electric power to
the appliance if service is to
be performed.
SHUTTING OFF BURNER ONLY
(PILOT STAYS LIT)
NOTE: The first time that the
heater is operated after connecting
the gas supply , the control knob
should be depressed for about thirty
(30) seconds. This will allow air to
bleed from the gas system.
Turn control knob clockwise
to the PILOT/IGN position.
ꢀMANUAL LIGHTINGꢀ
PROCEDURE
6. With control knob pressed in,
push down and release the
ignitor button. This will light
pilot. If needed, keep pressing
ignitor button until pilot lights.
Figure 18 - Pilot
1. Remove lower front panel (see
Figure 7 page 7).
ꢀTHERMOSTATꢀ
CONTROL
2. Follow steps
1
through 5
under Lighting Instructions.
3. With control knob pressed in,
strike match. Hold match to
pilot until pilot lights.
OPERATION
NOTE: If pilot does not stay lit,refer
to Troubleshooting, pages 14 through
16. Also contact a qualified service
person or gas supplier for repairs.
Until repairs are made, light pilot
with match. To light pilot with match,
see Manual Lighting Procedure.
The thermostatic control used on
these models differs from standard
thermostats. Standard thermostats
simply turn on and off the burner.The
thermostat used on this heater
senses the room temperature. The
thermostat adjusts the amount
4.
Keep control knob pressed in
for 30 seconds after lighting
pilot. After 30 seconds, release
control knob. Follow step 8
under Lighting Instructions.
of gas flow to the
burner.
5. Replace lower front panel.
11
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OPERATING YOUR HEATER
ꢀLIGHTINGꢀ
INSTRUCTIONS
6. With control knob pressed in,
push down and release the
ignitor button. This will light
pilot. If needed, keep pressing
ignitor button until pilot lights.
NON-THERMOSTAT MODEL
ML300HGA
1. STOP!
Read
the
safety
information on the side of heater.
2. Check that gas supply to
heater is on.
ꢀFOR YOUR SAFETYꢀ
READ BEFORE LIGHTING
7.
Keep control knob depressed
for ten (10) seconds after lighting
pilot. If pilot goes out, repeat
steps 5,6 and 7.
WARNING: If you do not
follow these instructions exactly,
a fire or explosion may result
causing property damage,
personal injury or loss of life.
3.
Push in control knob slightly
and turn clockwise to the
OFF position.(see Figure 19)
NOTE: Knob cannot be turned
from "PILOT " to "OFF" unless
knob is pushed in slightly. Do
not force.
8.
To select the desired heating
level, partially press down the
control knob slightly and rotate
A.
This appliance has a pilot
which must be lighted by hand.
When lighting the pilot, follow these
instructions exactly.
counterclockwise
. Release
the downward pressure on the
knob while continuing to turn
until the knob locks at the
desired setting position. Do not
4. Wait five minutes to clear out
any gas. Then smell for gas, in-
cluding near the floor. If you smell
gas.STOP! Follow "B" in the
safety information on the side of
heater. If you don’t smell gas. go
to the next step.
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.
operate
positions.
between locked
5.
Push in and turn control knob
counterclockwise to PILOT
position. Press in control knob
for five(5) seconds.
Note: You may be running
this heater for the first time
after hooking up to gas supply.
If so, you may need to press in
control knob for 30 seconds. This
will allow air to bleed from
the gas system.
WHAT TO DO IF YOU SMELL GAS
ꢀTO TURN OFFꢀ
GAS TO APPLIANCE
Shutting Off Heater
ꢀ
ꢀ
Do not try to light any appliance.
Do not touch any electric
switch, do not use any phone
in your building.
1. Turn control knob clockwise
to the OFF position.
2. Turn off all electric power to the
appliance if service is to
be performed.
Shutting Off Burner Only (pilot
stays lit )
Slightly press in control turn
ꢀ
ꢀ
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
control knob clockwise
PILOT position.
to the
department.
C. Use only your hand to push in
or turn the gas control knob.
Never use tools. If the 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 under water.
Immediately call a qualified service
technician to inspect the
appliance and to replace any part of
the control system and any gas
control which has been under water.
ꢀMANUAL LIGHTINGꢀ
PROCEDURE
1. Remove lower front panel (see
Figure 7 page 7).
Figure 19 - Control Knob In The
OFF Position
2. Follow steps
1
through 5
under Lighting Instructions.
3. With control knob pressed in,
strike match. Hold match to
pilot until pilot lights.
4.
Keep control knob pressed in
for 30 seconds after lighting
pilot. After 30 seconds, release
control knob. Follow step 8
under Lighting Instructions.
Figure 20 - Pilot
5. Replace lower front panel.
1 2
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CLEANING ODS/PILOT AND
BURNER
INSPECTING BURNER
Check pilot flame pattern and
burner flame pattern often.
WARNING: If yellow tipping
occurs, your heater could
produce increased levels of
carbon monoxide. If burner
flame pattern shows yellow
tipping, follow instructions at
bottom of this page.
ꢀ
Use
a
vacuum cleaner,
pressurized air or small, soft
bristled brush to clean.
PILOT FLAME PATTERN
Figure 21 shows a correct pilot
flame pattern. Figure 22 shows an
incorrect pilot flame pattern. The
incorrect pilot flame is not touching
thermocouple. This will cause the
thermocouple to cool. When the
thermocouple cools, the heater will
shut down. If pilot flame pattern is
incorrect, as shown in Figure 22.
CLEANING BURNER
PILOT AIR INLET HOLE
We recommend that you clean the
unit every 2,500 hours of operation
or every three months. We also
recommend 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 PSl.
Your local computer store, hardware
store, or home center may carry
compressed air in a can. You can
use a vacuum cleaner in the blow
position. If 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 pilot assembly.
Notice: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles enter the
heater and burn causing brief
patches of orange flame.
ꢀ
turn heater off (see To Turn
Off Gas To Appliance on page
12 for non-thermostat model or
page 11 for thermostat model)
see Troubleshooting on pages 14
through 16
ꢀ
Figure 23 - Correct Burner Flame
Pattern
1.
Shut off the unit, including the
pilot. Allow the unit to cool for
at least thirty minutes.
2.
3.
Inspect burner, pilot for dust
and dirt.
Blow air through the ports/slots
and holes in the burner.
Figure 21 - Correct Pilot Flame
Pattern
Figure 24 - Incorrect Burner Flame
Pattern
Clean the pilot assembly also. A
yellow tip on the pilot flame
indicates dust and dirt in the pilot
assembly. There is a 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
compressed air is not available.
CLEANING AND
MAINTENANCE
Figure 22 - Incorrect Pilot Flame
Pattern
WARNING: Turn off heater
and let cool before servicing.
BURNER FLAME PATTERN
CAUTION: You must keep control
areas, burner, and circulating air
passageways of heater clean. Inspect
these areas of heater before each
use. Have heater Inspected yearly by
a qualified service person. Heater may
need more frequent cleaning due to
excessive lint from carpeting, bedding
material, pet hair, etc.
Figure 23 shows a correct burner
flame pattern. Figure 24 shows an
incorrect burner flame pattern. If
pilot flame pattern is incorrect, as
shown in Figure 24.
ꢀ
turn heater off (see To Turn Off
Gas To Appliance on page 12 for
non-thermostat model or page
11 for thermostat model)
see Troubleshooting on pages 14
through 16
Figure 25 - Pilot Inlet Air Hole
CLEANING HEATER CABINET
Air Passageways
ꢀ
Use
pressurized air to clean.
Exterior
Use a soft cloth dampened with
a
vacuum cleaner or
ꢀ
ꢀ
a mild soap and water mixture.
Wipe the cabinet to remove dust.
13
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TROUBLESHOOTING
Note :
All
troubleshooting
CAUTION: Never use a wire,
needle, or similar object to clean
ODS/pilot. This can damage
ODS/pilot unit.
WARNING: Only a qualified
service person should service and
repair heater.
items are listed in order of
operation.
OBSERVED PROBLEM
POSSIBLE CAUSE
REMEDY
When ignitor button is pressed in,
there is no spark at ODS/pilot.
1. Ignitor electrode is positioned
wrong.
1. Replace ignitor.
2. Ignitor electrode is broken.
3. Ignitor electrode is not connected
to ignitor cable.
2. Replace ignitor.
3. Reconnect ignitor cable.
4. Ignitor cable pinched or wet.
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 piezo ignitor.
When ignitor button is pressed in,
there is a spark at ODS/pilot but no
ignition.
1. Gas supply turned off or
equipment shutoff valve is closed.
2. Control knob not fully pressed in
while pressing ignitor button.
1. Turn on gas supply of open
equipment shutoff valve.
2. Fully press in control knob
while pressing ignitor button.
3. Continue holding down control
knob. Repeat igniting operation
until air is removed.
3. Air in gas lines when installed.
4. ODS/pilot is clogged.
4. Clean ODS/pilot (see Cleaning
and Maintenance. Page 13) or
replace ODS/pilot assembly.
5. Replace gas regulator.
6. Turn control knob to pilot position.
7. Contact local propane/LP gas
campany.
5. Gas regulator setting is not correct.
6. Control knob not in PILOT position.
7. Depleted gas supply.
ODS/pilot lights but flame goes out
when control knob is released.
1. Control knob is not fully pressed in.
2. Control knob is not pressed in
long enough.
1. Press in control knob fully.
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds.
3. Equipment shutoff valve is not
fully open.
3. Fully open equipment shutoff valve.
4. Thermocouple connection loose
at control valve.
4. Hand tighten until snug, then
tighten 1/4 turn more.
5 Pilot flame is not touching
thermocouple. This allows
thermocouple to cool, causing pilot
flame to go out.
5. A) Contact local propane/LP gas
company.
B) Clean ODS/pilot (see Cleaning
and Maintenance. Page 13) or
replace ODS/pilot assembly.
This problem could be caused
by one or both of the following:
A) Low gas pressure
B) Dirty
or
partially clogged
ODS/pilot
6. Thermocouple damaged.
7. Control valve damaged.
6. Replace thermocouple.
7. Replace control valve.
1 4
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TROUBLESHOOTING
Continued
OBSERVED PROBLEM
POSSIBLE CAUSE
REMEDY
Burner(s)does not light after
ODS/pilot is lit.
1. Burner orifice is clogged.
1. Clean burner orifice (see Cleaning
and Maintenance, page 13) or
replace burner orifice.
2. Burner orifice diameter is too small
3. Inlet gas pressure is too low.
2. Replace burner orifice.
3. Contact local Propane/LP gas company.
Delayed ignition of burner(s).
1. Manifold pressure is too low.
2. Burner orifice is clogged.
1. Contact local Propane/LP gas company.
2. Clean burner (see Cleaning and
Maintenance, page 13) or replace
burner orifice.
Burner backfiring during combustion.
1. Burner orifice is clogged or
damaged.
1. Clean burner orifice (see Cleaning
and Maintenance, page 13) or
replace.
2. Burner damaged.
2. Replace burner.
3. Gas regulator defective.
3. Replace gas regulator.
Yellow flame during burner
combustion.
1. Not enough air.
1. Check burner for dirt and debris. If
found, clean burner (see Cleaning
and Maintenance, Page 13).
2. Gas regulator defective.
2. Replace gas regulator.
3. Inlet gas pressure is too low.
3. Contact local propane/LP gas company.
Slight smoke or odor during
initial operation.
1. Residues from manufacturing
processes.
1. Problem will stop after a few hours
of operation.
Heater produces a whistling noise
when burner is lit.
1. Turning control knob to HI position
when burner is cold.
2. Air in gas line.
1. Turn control knob to LO position
and let warm up for a minute.
2. Operate burner until air is removed
from line. Have gas line checked
by local Propane/LP gas company.
3. Observe minimum installation
clearances (Figure 4, p7).
3. Air passageways on heater
blocked.
4. Dirty or partially clogged burner
orifice.
4. Clean burner (see Cleaning and
maintenance, Page13) or replace
burner orifice.
Heater produces a clicking/ticking
noise just after burner is lit or
shut off.
1. Metal expanding while heating or
contracting while cooling.
1. This is common with most
heaters. If noise is excessive,
contact qualified service person.
White powder residue forming within
burner box or on adjacent
walls or furniture.
1. When
heated, vapors from
1. Turn heater off when using
furniture polish, wax, carpet
cleaner or similar products.
furniture polish, wax, carpet
cleaners, etc. turn into white
powder residue.
15
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TROUBLESHOOTING
Continued
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 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.
IMPORTANT: Operating heater where impurities in air exist may create odors. Clean-
ing 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.
REMEDY
POSSIBLE CAUSE
OBSERVED PROBLEM
1. Ventilate room. Stop using odor
causing products while heater
is running.
2. Locate and correct all leaks(see
Checking Gas Connections,
page 10).
1. Heater burning vapors from
paint, hair spray, glues, etc.
(See IMPORTANT statement
above).
2. Gas leak. See Warning
Statement at top of page.
Heater produces unwanted odors.
3. Refill supply tank.
3. Low fuel supply.
1. Open window and/or door for
ventilation.
2. Contact local Propane/LP gas
company.
1. Not enough fresh air is available.
2. Low line pressure.
Heater shuts off in use (ODS operates).
3. Clean ODS/pilot (see Cleaning
Page 13).
3. ODS/pilot is partially clogged.
1. Locate and correct all leaks(see
Checking Gas Connections,
Page 10).
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.
2. Replace control valve.
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 10).
2. Gas
leak.
See Warning
Statement at top of page.
1. This is common with most
heaters. if noise is excessive,
contact qualified service person.
1. Metal is expanding while heating
or contracting while cooling.
Heater produces a clicking/ticking
noise just after burner is lit or shut off.
1. Refer to Air for Combustion and
1. Not enough combustion/ventilation
air.
Moisture/condensation noticed on
windows.
Ventilation requirements, Page
4.
1 6
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SPECIFICATIONS
ML300HGA
15,000/28,000
Propane/LP Only
Piezo
ML300TGA
14,000/28,000
Propane/LP Only
Piezo
Btu(available)
Gas Type
Ignition
8" W.C.
8"W.C
Pressure Regulator Setting
Inlet Gas Pressure* (inches of water)
14"
11"
14"
11"
Maximum
Minimum
Dimensions, Inches (HxWxD)
Heater
23 1/2 26 5/8 8
23 1/2 26 5/8 8
×
×
×
×
×
×
×
×
26 1/2 28 1/2 91/4
26 1/2 28 1/2 91/4
Carton
Weight (pounds)
Heater
26
31
26
31
Shipping
Note: Dimensions listed are outer most points on the heater (includes control knobs and grill).
* For purposes of input adjustment.
For all models, provides better heat
TECHNICAL SERVICE
REPLACEMENT PARTS
Note: Use only original replacement
parts. This will protect your warranty
coverage for parts replaced under
warranty.
distribution. Makes heater or efficient.
Complete installation and operating
instructions included.
You may have further questions
about installation, operation, or
troubleshooting. If so, contact
PRO-COM. The information on the
back of this manual.
Thermostatically-controlled PF06-
YJLF-B, includes three settings
ON/OFF/AUTO
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 this back of the manual. When
contacting your dealer or PRO-COM,
have ready:
ACCESSORIES
Purchase these heater accessories
from your local dealer. If they can
not supply these accessories,
contact PRO-COM for information.
You can also write to the address
listed on the back page of this
manual.
ꢀ
ꢀ
your name
your address
ꢀ model and serial numbers of
your heater
ꢀ
ꢀ
how heater was malfunctioning
type of gas used (propane/LP or
natural gas)
ꢀ
ꢀ
purchase date
Warranty Card
Usually, we will ask you to return the
defective part to the factory.
FAN PF06-YJLF-B
PARTS NOT UNDER
EQUIPMENT SHUTOFF VALVE
For all models. Equipment shutoff
valve with 1/8" NPT tap. This part
is not currently available from
PRO-COM.
WARRANTY
Contact authorized dealers of this
product. If they can’t supply original
replacement part(s),contact PRO-COM.
17
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ILLUSTRATED
PARTS
B
M
1 8
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This list contains replaceable parts used in your heater. When ordering replacement
parts, follow the instructions listed under Replacement Parts 17 on page of this manual.
PARTS LIST
ML300TGA
ML300TGA
PART NO.
KEY
NO.
QTY
DESCRIPTION
MB10002
MB09001
MB11002
ML089-01
ML084-01
MB29001
ML069-02
SIT545-175
845-4.8x60Z
ML111-01
ML083-03
ML073-01
NRV81FI-8
96-4Z
ML079-01
MB40006
MB40022
MB40023
NBB30-000B1
ML101-01
ML091-07
ML103-01
ML104-01
ND2008x800x9
ND0803-8
ND0807-B2
ML105-01
6170-5Z
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
24_1
24_2
25
26
27
1
1
1
1
1
1
12
1
2
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
2
1
Cabinet Assembly
Lower Front Panel Assembly
Reflector Unit
Steel Wind Shield
Middle Panel
Grill Guard
Self Tapping Screw
Thermostat Valve Assembly
Screws
Thermostat Valve Base/Bracket
Ignitor Assembly
Ignitor Line
Pressure Regulator
Washer
Self Locking Screw
Main Inlet Tube Assembly
ODS Line Assembly
Burner Inlet Tube Assembly
Burner
Burner Connector
Injector
Left Burner Support Bracket
Right Burner Support Bracket
ODS/pilot Assembly
Thermocouple
Ignitor Electrode
ODS Upper Deflector
NUT
ML060-01
Mounting Bracket
PARTS AVAILABLE NOT SHOWN
Assembly Hardware
CSA Label
Gas Instruction Decal
Inside Warning Label
Thermostat Sensing Bulb Clip
MB28001
ML070-28
ML071-02
ML072-01
ML065-01
1
1
1
1
2
19
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ILLUSTRATED
PARTS
BREAKDOWN
2 0
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PARTS LIST
ML300HGA
This list contains replaceable parts used in your heater. When ordering replacement
parts, follow the instructions listed under Replacement Parts on page 17 of this manual.
KEY
ML300HGA
QTY
DESCRIPTION
NO.
PART NO.
1
2
3
4
5
6
7
8
9
MB10003
MB09001
MB11002
ML089-01
MB29001
ML084-01
ML083-03
ML069-02
NV2020-14
ML073-01
MB16002
ML029-01
NRV81FI-8
96-4Z
ML079-01
MB40016
MB40018
MB40019
MB40020
MB40021
ML096-01
MB40017
NBB30-000B1
ML101-01
ML091-01
ML103-01
ML104-01
ND2008x800x9
ND0803-8
ND0807-B2
ML105-01
6170-5Z
1
1
1
1
1
1
1
12
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
Cabinet Assembly
Lower Front Panel Assembly
Reflector Unit
Steel Wind Shield
Grill Guard
Middle Panel
lgnitor Assembly
Self Tapping Screw
Control Valve
Ignitor Line
Control Knob Assembly
Control Valve Fixed Nut
Pressure Regulator
Washer
Self Locking Screw
Main Inlet Tube Assembly
ODS Line Assembly
Lower Gas Outline Tube Assembly
Medium Gas Outline Tube Assembly
High Gas Outline Tube Assembly
4-Way Connector
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
28-1
28-2
29
30
31
Burner Inlet Tube Assembly
Burner
Burner Connector
Injector
Left Burner Support Bracket
Right Burner Support Bracket
ODS/Pilot Assembly
Thermocouple
Ignitor Electrode
ODS Upper Deflector
NUT
ML060-01
Mounting Bracket
PARTS AVAILABLE.NOT SHOWN
Assembly Hardware
CSA Label
Gas Instruction Decal
Inside Warning Label
Thermostat Sensing Bulb Clip
MB28001
ML070-26
ML071-02
ML072-01
ML065-01
1
1
1
1
2
21
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