Procom MN180TPH Installation instructions

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Vent-Free Gas
Infrared space Heater
Printed in China
PC-MEL110-01D-0708
Questions about installation, operation, or troubleshooting? Before returning to your retailer, call
customer service department toll-free at [phone].
CAUTION - FOR YOUR SAFETY
ML150TPH
ML150HPH
ML250TPH
ML250HPH
MN180TPH
MN180HPH
MN300TPH
MN300HPH
WARNING: IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED
EXACTLY, A FIRE MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL
INJURY, OR LOSS OF LIFE.
-- Do not store or use gasoline or other ammable vapors and liquids in 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 re department.
-- Installation and service must be performed by a qualied installer, service agency
or the gas supplier.
This is an unvented gas-red 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 5 of this manual.
INSTALLER: DO NO DISCARD THIS MANUAL – LEAVE FOR HOMEOWNER’S
FUTURE REFERENCE
This appliance may be installed in an aftermarket, 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.

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TABLE OF CONTENTS
Important Safety Information ..........................................................................................................................3
Air for Combustion & Ventilation ....................................................................................................................5
Product Features .............................................................................................................................................7
Preparing for Installation.................................................................................................................................8
Installation.......................................................................................................................................................11
Operation........................................................................................................................................................14
WARNING: READ THE INSTALLATION & OPERATION INSTRUCTIONS
BEFORE USING THIS APPLIANCE
IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble,
operate, or service this heater. Improper use of this heater can cause serious injury or death from
burns, re, explosion, and carbon monoxide poisoning.
WARNING: Due to high temperatures, the appliance should be located out of trafc and away from
furniture and draperies.
WARNING: 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 shutoff. Allow surfaces to cool
before touching.
WARNING: Do not place clothing or other ammable material on or near the appliance. Never place
any objects in the heater.
Product Specifications ...........................................................................................................................17
Troubleshooting ............................................................................................................................................18
Replacement Parts.........................................................................................................................................21
Part lists.........................................................................................................................................................22

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IMPORTANT SAFETY INFORMATION
WARNING: Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or
any other appliance.
Installation and service must be performed by a qualied installer, service agency, or local gas supplier.
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: When used without fresh air, heater may give off CARBON MONOXIDE, an odorless, poisonous gas.
DO NOT INSTALL HEATER UNTIL ALL NECESSARY PROVISIONS ARE MADE FOR COMBUSTION
AND VENTILATION. CONSULT THE WRITTEN INSTRUCTIONS PROVIDED WITH THE HEATER FOR
INFORMATION CONCERNING COMBUSTION AND VENTILATION. IN THE ABSENCE OF INSTRUC-
TIONS. REFER TO THE NATIONAL FUEL GAS CODE. ANSI Z223. 1. SECTION 5.3 OR APPLICABLE
LOCAL CODES.
This heater is equipped with a PILOT LIGHT SAFETY SYSTEM designed to turn off the heater if not
enough fresh air is available.
DO NOT TAMPER WITH PILOT LIGHT SAFETY SYSTEM! If heater shuts off, do not relight until you pro-
vide fresh air. If heater keeps shutting off have it serviced. Keep burner and control compartment clean.
CARBON MONOXIDE POISONING MAY LEAD TO DEATH! Early signs of carbon monoxide poison-
ing resemble the u with headache, dizziness and/or nausea. If you have these signs, heater may not be
working properly. Get fresh air at once! Have heater serviced. Some people - pregnant women, persons
with heart or lung disease, anemia, those under the inuence of alcohol, those at high altitude - are more
affected by carbon monoxide than others.
NATURAL AND PROPANE/LP GAS
Natural and Propane/LP gas are odorless. An odor-producing agent is added to the gas. The odor helps you
detect a gas leak. However, the odor added to the gas can fade. Gas may be present even though no odor
exists.
WARNING: Any change to this heater or its controls can be dangerous.
WARNING: Models MN180TPH, MN180HPH, MN300TPH, MN300HPH are equipped for natural gas. Field
conversion is not permitted. Models ML150TPH, ML150HPH, ML250TPH, ML250HPH are equipped for
propane gas. Field conversion is not permitted.
WARNING: Do not use any accessories not approved for use with this heater.

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WARNING: Carefully supervise young children when they are in the room with the heater.
WARNING: Make sure grill guard is in place before running heater.
WARNING: Keep the appliance area clear and free from combustible materials, gasoline, and other am-
mable vapors and liquids.
1. This appliance is for use with only the type of gas indicated on the rating plate. This appliance is not
convertible for use with other gases.
2. Do not place Propane/LP supply tank(s) inside any structure. Place Propane/LP supply tank(s) outdoors.
3. 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 re department.
4. Models MN/L 100HPH and MN/L100TPH shall not be installed in a bathroom.
5. This heater needs fresh air ventilation to run properly. This heater has an Oxygen Depletion Sensing (ODS)
safety shutoff system. The ODS shuts down the heater if not enough fresh air is available. See Air for
Combustion and Ventilation, pages 5 through 6. If heater keeps shutting off, see Troubleshooting, pages 18
through 20.
6. Keep all air openings in front and bottom of heater clear and free of debris. This will ensure enough air for
proper combustion.
7. If heater shuts off. Do not relight until you provide fresh, outside air. If heater keeps shutting off, have it ser-
viced.
8. Do not run heater:
Where ammable liquids or vapors are used or stored.
Under dusty conditions.
9. 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.
10. Always run heater with control knob at PILOT/IGN, LOW or HIGH locked positions. Never set control knob
between locked positions. Poor combustion and higher levels of carbon monoxide may result.
11. Do not use heater if any part has been under water. Immediately call a qualied service technician to
inspect the room heater and to replace any part of the control system and any gas control which has been
under water.
12. Turn off and unplug heater and let cool before servicing. Only a qualied service person should service and
repair heater.
13. Operating heater above elevations of 4,500 feet could cause pilot outage.
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AIR FOR COMBUSTION AND VENTILATION
WARNING: This heater shall not be installed in a conned space or unusually tight construction unless pro-
visions are provided for adequate combustion and ventilation air. Read the following instructions to insure
proper fresh air for this and other fuel-burning appliances in your home.
Providing Adequate Ventilation
The following are excerpts from National Fuel Gas Code, NFPA 54/ANSI Z223.1, Section 5.3, Air for Combustion
and Ventilation. All spaces in homes fall into one of the three following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
The information on pages 5 through 6 will help you classify your space and provide adequate ventilation.
Conned and Unconned Space
The National Fuel Gas Code, ANSI Z223.1 denes a conned 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 unconned 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 connecting directly
with the space in which the appliances are installed*, through openings not furnished with doors, are considered
a part of the unconned space.
This heater shall not be installed in a conned space or unusually tight construction unless provisions are pro-
vided for adequate combustion and ventilation air.
* Adjoining rooms are connecting only if there are doorless passageways or ventilation grills between them.
Unusually Tight Construction
The air that leaks around doors and windows may provide enough fresh air for combustion and ventilation. How-
ever, in buildings of unusually tight construction, you must provide additional fresh air.
Unusually tight construction is dened as construction where:
Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating
of one perm (6×10-11kg per pa-sec-m2) or less with openings gasketed or sealed and
Weather stripping has been added on openable windows and doors and
Caulking or sealants are applied to areas such as joints around window and door frames, between sole
plates and oors, 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”. If your home does not meet all of the three criteria above, proceed to “Determining Fresh-Air Flow
For Heater Location”.
a)
b)
c)

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DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Conned or Unconned Space
Use this worksheet to determine if you have a conned or unconned 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= 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)
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free heater
Gas water heater*
Gas furnace
Vented gas heater
Gas heater logs
Other gas appliances* +
Total =
*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)
56,000 Btu/Hr(actual amount of Btu/Hr used)
The space in the above example is a conned 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:
Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconned
space, remove door to adjoining room or add ventilation grills between rooms. See “Ventilation Air From
Inside Building”.
Vent room directly to the outdoors. See “Ventilation Air From Outdoors”.
Install a lower Btu/Hr heater if lower Btu/Hr size makes room unconned.
WARNING: If the area in which the heater may be operated is smaller than that dened as an unconned 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, ANSI Z223.1/NFPA 54, Air for Combustion and Ventilation, or
applicable local codes.
a)
b)
c)
Example:
Gas water heater 30,000 Btu/Hr
Vent-free heater + 26,000 Btu/Hr
Total = 56,000 Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Ventilation Air From lnside Building
This fresh air would come from an adjoining unconned space. When
ventilating to an adjoining unconned space, you must provide two perma-
nent openings: one within 12 inches of the ceiling and one within 12 inches
of the oor on the wall connecting the two spaces (see options 1 and 2,
Figure 2). You can also remove the door into adjoining room (see option
3, Figure 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 1 - Ventilation Air from Outdoors

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Figure 2 - Ventilation Air from
Inside Building
NOTE: Base Not included. Not for
use in bedrooms or bathrooms.
PRODUCT FEATURES
Safety Pilot
This heater has a pilot with an Oxygen Depletion Sensing (ODS) safety shutoff system. The ODS/pilot shuts off
the heater if there is not enough fresh air.
Piezo Ignition System
This heater is equipped with an automatic control system. This system requires AAA batteries (provided).
Thermostatic Heat Control (MN180TPH, MN300TPH, ML150TPH, ML250TPH models)
This heater has a control with a thermostat sensing bulb. This results in the greatest heater comfort and will
result in lower gas bills.
LOCAL CODES
This heater is designed for vent free operation. Some state and local codes prohibit the use of vent-free gas heaters.
Install and use heater with care. Follow all local codes. In the absence of local codes, use the latest edition of
The National Fuel Gas Code, ANSI Z223.1, also known as NFPA 54*.
*Available from:
American National Standards Institute, lnc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, lnc.
1 Batterymarch Park
Quincy, MA 02269-9101
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or ducts. You must provide
two permanent openings: one within 12 inches of the ceiling and one within
12 inches of the oor. Connect these items directly to the outdoors or spaces
open to the outdoors. These spaces include attics and crawl spaces. Fol-
low the National Fuel Gas Code, NFPA 54/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 air into attic if
attic has a thermostat-controlled power vent. Heated air entering the attic will
activate the power vent. Rework worksheet, adding the space of the adjoin-
ing unconned space. The combined spaces must have enough fresh air to
supply all appliances in both spaces.
State of Massachusetts: The installation must be made by a licensed plumber or gas fitter in the
Commonwealth of Massachusetts. Sellers of unvented propane or natural gas-red supplemental room heaters
shall provide to each purchaser a copy of 527 CMR 30 upon sale of the unit.
In the State of Massachusetts, unvented propane or natural gas-fired space heaters shall be prohibited in
bedrooms and bathrooms.
In the State of Massachusetts the gas cock must be a T-handle type. The State of Massachusetts requires that
a exible appliance connector cannot exceed three feet in length.

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PREPARING FOR INSTALLATION
Before beginning assembly or operation of the product, make sure all parts are present. Compare parts with
package contents list and diagram above. If any part is missing or damaged, do not attempt to assemble, install
or operate the product. Contact customer service for replacement parts.
Before installing heater, make sure you have the items listed below
piping (check local codes)
sealant (resistant to natural gas and propane/LP gas)
equipment shutoff valve*
test gauge connection*
sediment trap
tee joint
pipe wrench
exible gas hose (check local codes)
*A CSA design-certied equipment shutoff valve with 1/8-inch NPT tap is an acceptable alternative to test gauge connection. Purchase the
optional CSA design-certied equipment shutoff valve from your dealer.
UNPACKING
1. Remove heater from carton.
2. Remove all protective packaging applied to heater for shipping
3. Check heater for any shipping damage. If heater is damaged, promptly inform dealer where you bought
heater.
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•Figure 3- Vent - Free Gas Heater
WATER VAPOR: A BY-PRODUCT OF UNVENTED ROOM HEATERS
Water vapor is a by-product of gas combustion. An un-
vented room heater produces approximately one (1)
ounce (30ml) of water for every 1,000 BTUs (.3 KWs)
of gas input per hour.
Unvented room heaters are recommended as supple-
mental heat (a room) rather than a primary heat source
(an entire house). In most supplemental heat applica-
tions, the water vapor does not create a problem. In
most applications, the water vapor enhances the low
humidity atmosphere experience during cold weather.
The following steps will help insure that water vapor
does not become a problem.
1. Be sure the heater is sized properly for the ap-
plication, including ample combustion air and
circulation air.
2. If high humidity is experienced, a dehumidier
may be used to help lower the water vapor con-
tent of the air.
3. Do not use an unvented room heater as the
primary heat source.
NOTICE: This heater is intended for use as supplemental heat. Use this heater along with your primary heat-
ing 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.
CAUTION: If you install the heater in a home garage:
Heater pilot and burner must be at least 18 inches above the oor.
Place heater where moving vehicle will not hit it.
WARNING: A qualied service person must install heater. Follow all local codes.
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Figure 4 - Mouting clearances as
viewed from front of heater (inches)
WARNING: Never install the heater
in a bedroom or bathroom
in a recreational vehicle
where curtains, furniture, clothing, or other ammable objects
are less than 36 inches from the front, top, or sides of the heater
in high trafc areas
in windy or drafty areas
WARNING: Maintain the minimum clearances shown in Figure
4. If you can, provide greater clearances from oor, ceiling, and
joining wall.
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 coverings or operating heater where impurities
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(such as tobacco smoke, aromatic candles, cleaning uids,
Check Gas Type
Be sure your gas supply is right for your heater. Otherwise, call dealer where you bought the heater for proper
type heater.
Clearances To Combustibles
Carefully follow the instructions below. This heater is a freestanding unit designed to be mounted on a wall or set
directly on the oor.
WARNING: Maintain the minimum clearances shown in Figure 4. If you can, provide greater clearances from
oor, ceiling, and joining wall.
LOCATING HEATER
This heater is designed to be mounted on a wall. For convenience and efciency, install heater:
where there is easy access for operation, inspection, and service.
in the coldest part of room.
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INSTALLING THERMOSTAT SENSING BULB
( ONLY FOR MN180TPH, MN300TPH, ML150TPH, ML250TPH )
1. Pull out the sensing bulb from the two clips located in the shipping
position. 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. Then insert the sensing bulb into the bulb clip
(see Figure 5).
Figure 5 - Moving Thermo-
stat Sensing Bulb
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.
Removing Front Panel of Heater
1. Remove 4 screws - 2 screws on each side of the front panel.
2. Pull front panel forward.
3. Replace front panel when completed, using the screws removed.
Figure 6 - Mounting Bracket Location
oil or kerosene lamps, etc.) in the air exist may discolor walls.

1010
Figure 7 - Mounting Bracket
Clearances (inches)
Methods For Attaching Mounting Bracket To Wall
Use only the last hole on each end of mounting bracket to attach bracket to wall. Attach mounting bracket to a
wall only in one of two ways:
1. Attaching to wall stud: This method provides the strongest hold. Insert mounting screws through mounting
bracket and into wall studs.
2. 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).
3. Decide which method better suits your needs. Either method will provide a secure hold for the mounting bracket.
Marking Screw Locations
1. Tape mounting bracket to wall where heater will be located. Make sure
mounting bracket is level.
WARNING: Maintain minimum clearances shown in Figure 4. If you
can, provide greater clearances from oor and joining wall.
2. Mark screw locations on wall (see Figure 7).
Note: Mark only last hole on each end of mounting bracket. Insert
mounting screws through these holes only.
3. Remove tape and mounting bracket from wall.
Attaching Mounting Bracket To Wall
Note: Wall anchors, mounting screws, and spacers are in hardware pack-
age. The hardware package is provided with heater.
Attaching to Wall Stud Method
For attaching mounting bracket to wall studs:
1. Drill holes at marked locations using 9/64-inch 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 rmly 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):
1. Drill holes at marked locations using 5/16-inch drill bit. For solid walls
(concrete or masonry), drill at least 1 inch deep.
2. Fold wall anchor as shown in Figure 8.
3. Insert wall anchor (wings rst) into hole. Tap anchor ush to wall.
4. For thin walls (1/2 inch or less), insert red key into wall anchor. Push
red key to “pop” open anchor wings (see Figure 9).
IMPORTANT: Do not hammer anchor key! For thick walls (over 1/2 inch
thick) or solid walls, do not pop open wings.
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 rmly fastened to wall.
Figure 8 - Folding Anchor
Figure 9 - Popping Open Anchor
Wing For Thin Walls
MN180TPH, ML150TPH,
MN180HPH, ML150HPH
MN300TPH, ML250TPH,
MN300HPH, ML250HPH

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Placing Heater On Mounting Bracket
1. Locate two horizontal slots on back panel of heater (see Figure 10).
2. Place heater onto mounting bracket. Slide horizontal slots onto stand-out
tabs on mounting bracket.
Installing Bottom Mounting Bracket
1. Install bottom bracket to heater bottom with two screws. It may be more
convenient to remove heater from wall bracket to attach.
2. Place heater on wall mounting bracket.
3. Mark screw locations on wall.
4. Remove heater from mounting bracket.
5. If installing bottom mounting screws into hollow or solid wall, install wall an-
chors. 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-inch drill bit.
6. Replace heater onto mounting bracket.
7. Tighten both screws until heater is rmly secured to wall. Do not over tighten.
Figure 10 - Mounting Heater
Onto Mounting Bracket
Figure 11 - Installing Bottom
Mounting Bracket
WARNING: A qualied service technician must connect heater to gas supply. Follow all local codes.
WARNING: This appliance requires a 3/8-inch NPT (National Pipe Thread) inlet connection to the pressure
regulator.
WARNING: Never connect heater to private (non-utility) gas wells. This gas is commonly known as wellhead gas.
WARNING: Do not over tighten gas connections.
CAUTION: Use only new, black iron or steel pipe. Internally tinned copper tubing may be used in certain ar-
eas. Check your local codes. Use pipe of 1/2-in. diameter or greater to allow proper gas volume to heater.
If pipe is too small, undue loss of pressure will occur.
NATURAL GAS MODELS:
CAUTION: Check your gas line pressure before connecting heater to gas line. Gas line pressure must be
no greater than 10.5 inches of water. If gas line pressure is higher, heater regulator damage could occur.
PROPANE MODELS:
CAUTION: Never connect heater directly to the gas supply. This heater requires an external regulator (not
supplied). Install the external regulator between the heater and gas supply.
CAUTION: Avoid damage to regulator. Hold gas regulator with wrench when connecting into gas piping
and/or ttings.
CAUTION: Use pipe joint sealant that is resistant to gas (Propane or Natural Gas).
CONNECTING TO GAS SUPPLY
INSTALLATION

1212
*A CSA/AGA design-certied equipment shutoff valve with 1/8-inch NPT tap
is an acceptable alternative to test gauge connection. Purchase the optional
CSA/AGA design-certied equipment shutoff valve from your dealer.
Typical Inlet Pipe Diameters
Use 3/8-inch black iron pipe or greater.
Installation must include an equipment
shutoff valve, union, and plugged 1/8-inch
NPT tap. Locate NPT tap within reach for
test gauge hook up. NPT tap must be up-
stream from heater (see Figure 12).
IMPORTANT: Install an equipment
shutoff valve in an accessible loca-
tion. 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 valves.
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.
Install sediment trap in supply line as shown in Figure 12.
Place sediment trap where it is within reach for cleaning. Place
sediment trap where trapped 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.
Installation of Base Stand
Before installing heater to the base , please make sure you
have the following items:
( 2 ) - Base ( 4 ) - Sheet Metal Screws
Installation Procedure:
1. Set back of heater on table with the bottom of heater
extending outside the table edge
2. Fasten Base Stand to heater using sheet metal screws.
Figure 12- Gas Connection (inches)
Figure 13 - External Regulator with Vent
Pointing Down
Fuel Supply
Tank
Figure 14 -

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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 ame to check for a 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 Pressures In Excess Of 1/2 PSIG(3.5kPa)
1. Disconnect heater 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.
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 gas supply valve.
4. Check all joints of gas supply piping system. Apply mixture of liquid soap
and water to gas joints. Bubbles forming indicates a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff valve to gas supply. Check reconnected ttings for leaks.
Test Pressures Equal To or Less Than 1/2 PSIG(3.5 kPa)
1. Close equipment shutoff valve (see Figure 15).
2. Pressurize supply piping system by either using
compressed air or opening natural supply tank valve.
3. Check all joints from gas meter to equipment shutoff
valve (see Figure 15). Apply mixture of liquid soap and
water to gas joints. Bubbles forming show a leak. Figure 15 - Equipment Shutoff Valve
Figure 16 - Fuel Supply
4. Correct all leaks at once.
Pressure Testing Heater Gas Connections
1. Open equipment shutoff valve (see Figure 16).
2. Open gas supply tank valve.
3. Make sure control knob of heater is in the OFF position.
4. Remove front panel
5. Check all joints from equipment shutoff valve to con-
trol valve (see Figure 16). 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 Operation Heater). Check all other internal joints
for leaks.
8. Turn off heater (see “To Turn Off Gas Appliance”).
9. Replace lower front panel.

1414
OPERATION
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not follow these instructions exactly, a re or explosion may result causing property
damage, personal injury or loss of life.
When lighting the pilot, follow these instructions exactly.
BEFORE LIGHTING, smell all around the appliance area for gas. Be sure to smell next to the oor be-
cause some gas is heavier than air and will settle on the oor.
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 qualied service technician or gas supplier. Forced or attempted
repair may result in a re or explosion.
Do not use this appliance if any part has been under water. Immediately call a qualied service technician
to inspect the appliance and to replace any part of the control system and any gas control which has been
under water.
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.
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 re department.
LIGHTING INSTRUCTIONS
1. STOP! Read the safety information on the side of the heater.
2. Make sure equipment shutoff valve is fully open.
3. Turn control knob clockwise to the OFF position.
4. Wait ve (5) minutes to clear out any gas. Then smell for gas, including near the oor. If you smell gas,
STOP! Do not try to light any appliance. Do not touch electrical switch or use any phone in the building. Im-
mediately contact gas supplier from a neighbor’s phone. Follow gas supplier’s instructions. If you can’t reach
the gas supplier, call the re dept. If you don’t smell gas, go to the next step.
5. Turn control knob counterclockwise to the PILOT position. Press in control knob for ve (5) seconds (see
Figure 17).
Note: The rst time that the heater is operate after connecting the gas supply,the control knob should be
depressed for about thirty(30) seconds.This will allow air to bleed from the gassy system. If pilot does not
stay lit, refer to Troubleshooting, pages 17 through 19. Also contact a qualied service technician or gas sup-
plier for repairs. Until repairs are made, light pilot with match. To light pilot with match, see Manual Lighting
Procedure.
• If control knob does not pop up when released, contact a qualied service technician or gas supplier for
repairs.
6. With control knob pressed in, push down and release ignitor button. This will light pilot. The pilot is attached
to the front of burner. The pilot can be seen through the glass panel. If needed, keep pressing ignitor button
until pilot lights.
Note: If pilot does not stay lit, refer to Troubleshooting, pages 18 through 20. Also contact a qualied service
technician or gas supplier for repairs. Until repairs are made, light pilot with match. To light pilot with match,
see “Manual Lighting Procedure”.
7. Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds, release control knob.
If control knob does not pop up when released, contact a qualied service technician or gas supplier for
repairs.
Note: If pilot goes out, repeat steps 3 through 7. This heater has a safety interlock system. Wait one (1)
minute before lighting pilot again.
A.
B.
C.
D.
•
•
•
•

1515
8. To select the desired heating level, partially press down the control knob slightly and rotate conterclockwise
. Release the downward pressure on the knob while continuing to turn until the knob locks at the desired
heat setting position. Do not operate between locked positions.
CAUTION: Do not try to adjust heating levels by using the equipment shutoff valve.
THERMOSTAT CONTROL OPERATION (ONLY FOR MN180TPH, MN300TPH, ML150TPH, ML300TPH)
The thermostatic control used on this model differs from standard thermostats. Standard thermostats simply turn
on and off the burner. The thermostat used on this heater senses the room temperature. At times the room may
exceed the set temperature. If so, the burner will shut off. The burner will cycle back on when room temperature
drops below the set temperature. The control knob can be set to any comfort level between 1 and 5.
Note: The thermostat sensing bulb 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
temperature, etc). Frequent use of your heater will let you determine your own comfort levels.
TO TURN OFF GAS TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise to the OFF position.
Shutting Off Burner Only (pilot stays lit )
Turn control knob clockwise to the PILOT position.
Figure 17 - Control Knob in the
OFF Position
Figure 18 - Pilot

1616
MANUAL LIGHTING PROCEDURE
1. Remove front panel.
2. Follow steps 1 through 5 under “Lighting Instructions” on page 14.
TO SELECT HEATING LEVEL
WARNING: When running heater, set control knob at PILOT IGN, LOW or HIGH locked positions (see
Figure 19). Never set control knob between locked positions. Poor combustion and higher levels of carbon
monoxide may result.
CAUTION: Do not try to adjust heating levels by using the equipment shutoff valve.
Slightly press in control knob and turn conterclockwise to the ON, LOW or HIGH positions (see Figure
19)
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” on page 14.
5. Replace front panel.
Figure 19

1717
INSPECTING BURNER
Check pilot ame pattern and burner ame pattern often.
PILOT FLAME PATTERN
Figure 20 shows a correct pilot ame pattern. Figure 21 shows an in-
correct pilot flame pattern. The incorrect pilot flame is not touching
the thermocouple. This will cause the thermocouple to cool. When the
thermocouple cools, the heater will shut down. If pilot ame pattern is
incorrect, as shown in Figure 21,
turn heater off (see “To Turn Off Gas to Appliance” on page 15)
see Troubleshooting pages 19 through 21.
WARNING: If yellow tipping occurs, your heater could produce
increased levels of carbon monoxide. If burner ame pattern shows yellow
tipping, follow instructions at bottom of this page.
Notice: Do not mistake orange ames with yellow tipping. Dirt or other ne
particles enter the heater and burn causing brief patches of orange ame.
BURNER FLAME PATTERN
Figure 22 shows a correct burner ame pattern. Figure 23 shows an
incorrect burner ame pattern. If burner ame pattern is incorrect, as
shown in Figure 23,
Turn heater off (see “To Turn Off Gas to Appliance”).
See Troubleshooting, pages 19 through 21.
CARE AND MAINTENANCE
WARNING: Turn off heater and let cool before servicing
CAUTION: You must keep control areas, burner, and circulating air
passageways of heater clean. Inspect these areas of heater before
•
•
•
•
Figure 20 - Correct Pilot Flame Pattern
Figure 21 - Incorrect Pilot Flame Pattern
Figure 22 - Correct Burner
Flame Pattern
Figure 23 - Incorrect Burner
Flame Pattern
each use. Have heater inspected yearly by a qualied service technician.
Heater may need more frequent cleaning due to excessive lint from carpet-
ing, bedding material, pet hair, etc.
ODS/PILOT AND BURNER
Use a vacuum cleaner, pressurized air, or a small, soft bristled brush to
clean.
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 as-
sembly 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.
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 ports/slots and holes in the burner. Also clean the pilot
assembly. A yellow tip on the pilot ame indicates dust and dirt in the pilot
assembly. There is a small pilot air inlet hole about two inches from where
the pilot ame comes out of the pilot assembly (see Figure 24). With the unit
off, lightly blow air through the air inlet hole. You may blow through a drink-
ing straw if compressed air is not available.
•
CABINET
Air Passageways
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.
•
•
•
Figure 24 - Pilot Inlet Air Hole

1818
ITEM NO ML150TPH ML150HPH ML250TPH ML250HPH
BTU (available) 15,000 15,000 25,000 25,000
Gas Type Propane/LP Only Propane/LP Only Propane/LP Only Propane/LP Only
Ignition Electric Piezo Electric Piezo Electric Piezo Electric Piezo
Pressure Regulator Setting 10” W.C. 10” W.C. 10” W.C. 10” W.C.
Inlet Gas Pressure* (inches of water)
Maximum 14” 14” 14” 14”
Minimum 11” 11” 11” 11”
Dimensions, Inches (HxWxD)
Heater 26.8X21x9.2 26.8X21x9.2 26.8X28.5X9.3 26.8X28.5X9.3
Carton 28.6X24x11.5 28.6X24x11.5 28X31.5X11.5 28X31.5X11.5
Weight (Pounds)
Heater 25.5 25.5 29.5 29.5
Shipping 31.5 31.5 37.5 37.5
ITEM NO MN180TPH MN180HPH MN300TPH MN300HPH
BTU (available) 18,000 18,000 30,000 30,000
Gas Type Natural Only Natural Only Natural Only Natural Only
Ignition Electric Piezo Electric Piezo Electric Piezo Electric Piezo
Pressure Regulator Setting 6” W.C. 6” W.C. 6” W.C. 6” W.C.
Inlet Gas Pressure* (inches of water)
Maximum 10.5” 10” 10.5” 10.5”
Minimum 7” 7” 7” 7”
Dimensions, Inches (HxWxD)
Heater 26.8X21X9.2 26.8X21X9.2 26.8X28.5X9.3 26.8X28.5X9.3
Carton 28.6×24×11.5 28.6×24×11.5 28X31.5x11.5 28X31.5x11.5
Weight (Pounds)
Heater 25.5 25.5 29.5 29.5
Shipping 31.5 31.5 37.5 37.5
PRODUCT SPECIFICATIONS
NOTE: Dimensions listed are outer most points on the heater (includes control knobs and grill).
* For purposes of input adjustment.

1919
PROBLEM
When ignitor button is pressed
in, there is no spark at ODS/
pilot.
When ignitor button is pressed
in, there is a spark at ODS/pilot
but no ignition.
ODS/pilot lights but ame
goes out when control knob is
released.
POSSIBLE CAUSE
1. Ignitor electrode is positioned wrong.
2. Ignitor electrode is broken.
3. Ignitor electrode is not connected to
ignitor cable.
4. Ignitor cable is pinched or wet.
5. Broken ignitor cable.
6. Bad piezo ignitor.
1. Gas supply is turned off or equipment
shutoff valve is closed.
2. Control knob not fully pressed in while
pressing ignitor button.
3. Air in gas lines when installed.
4. ODS/pilot is clogged.
5. Gas regulator setting is not correct.
6. Control knob not in PILOT position.
7. Depleted gas supply (propane).
1. Control knob is not fully pressed in.
2. Control knob is not pressed in long
enough.
3. Equipment shutoff valve is not fully
open.
4. Thermocouple connection is loose at
control valve.
5. Thermocouple damaged.
6. Control valve damaged.
REMEDY
1. Replace ignitor.
2. Replace ignitor.
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 piezo ignitor.
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.
4. Clean ODS/pilot (see Care and Main-
tenance, page 16) or replace ODS/pi-
lot assembly.
5. Replace gas regulator.
6. Turn control knob to PILOT position.
7. Contact local propane/LP gas company.
1. Press in control knob fully.
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds.
3. Fully open equipment shutoff valve
4. Hand tighten until snug, and then
tighten 1/4 turn more.
5. Replace thermocouple.
6. Contact customer service.
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 your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
If you cannot reach your gas supplier, call the re 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.
WARNING: Only a qualied service technician should service and repair heater.
CAUTION: Never use a wire, needle, or similar object to clean ODS/pilot. This can damage ODS/ pilot unit.
Note: All troubleshooting items are listed in order of operation.
•
•
•
•
•

2020
PROBLEM
Burner(s) does not light after
ODS/pilot is lit.
Delayed ignition of burner(s).
Burner backring during com-
bustion.
Yellow ame during burner
combustion.
Slight smoke or odor during
initial operation.
Heater produces a whistling
noise when burner is lit.
Heater produces a clicking/tick-
ing noise just after burner is lit
or shut off.
White powder residue forming
within burner box or on adja-
cent walls or furniture.
POSSIBLE CAUSE
1. Burner orice is clogged.
2. Burner orice diameter is too small.
3. Inlet gas pressure is too low.
1. Manifold pressure is too low.
2. Burner orice is clogged.
1. Burner orice is clogged or damaged.
2. Burner is damaged.
3. Gas regulator is defective.
1. Not enough air.
2. Gas regulator is defective.
3. Inlet gas pressure is too low.
1. Residues from manufacturing pro-
cesses.
1. Turning control knob to HI position
when burner is cold.
2. Air in gas line.
3. Air passageways on heater are
blocked.
4. Dirty or partially clogged burner ori-
ce.
1. Metal is expanding while heating or
contracting while cooling.
1. When heated, the vapors from furni-
ture polish, wax, carpet cleaners, etc.,
turn into white powder residue.
REMEDY
1. Clean burner orice (see Care and
Maintenance, page 17) or replace
burner orice.
2. Replace burner orice.
3. Contact local gas supplier.
1. Contact local gas supplier.
2. Clean burner (see Care and Main-
tenance, page 17) or replace burner
orice.
1. Clean burner orice (see Care and
Maintenance, page 17) or replace.
2. Contact customer service.
3. Replace gas supplier.
1. Check burner for dirt and debris. If
found, clean burner (see Care and
Maintenance, page 17).
2. Replace gas regulator.
3. Contact local gas supplier.
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 burner until air is removed
from line. Have gas line checked by
local gas supplier.
3. Observe minimum installation clear-
ances (Figure 4, page 9).
4. Clean burner (see Care and Main-
tenance, page 17) or replace burner
orice.
1. This is common with most heaters. if
noise is excessive, contact qualied
service technician.
1. Turn heater off when using furniture
polish, wax, carpet cleaner, or similar
products.