Procom ML100HBAHR Quick start guide

BLUE FLAME VENT-FREE
PROPANE/LP GAS HEATER
OWNER’S OPERATION AND
INSTALLATION MANUAL
MODELS
ML100HBAHR
ML100TBAHR
Questions, problems, missing parts? Before returning to your retailer, call
our customer service department at 1-866-573-0674, 7:30 am - 4:15 pm CST,
Monday through Friday or email [e-mail]
WARNING: If the information in this manual is not
followed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other ammable va-
pors 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 re
department.
— Installation and service must be performed by a quali-
ed installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
10,000 BTU/Hr
Thermostatically-Controlled Heater

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This is an unvented gas-red heater. It uses air (oxygen)
from the room in which it is installed. Provisions for ad-
equate combustion and ventilation air must be provided.
Refer to Air For Combustion and Ventilation section on
page 7 of this manual.
WARNING: Improper installation, adjustment, al-
teration, service or maintenance can cause injury or
property damage. Refer to this manual for correct in-
stallation and operational procedures. For assistance
or additional information consult a qualied installer,
service agency or the gas supplier.
This appliance may be installed in an aftermarket,* per-
manently located, manufactured (mobile) home, where
not prohibited by local codes.
This appliance is only for use with the type of gas indi-
cated on the rating plate. This appliance is not convert-
ible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer.
SAVE THIS BOOK
TABLE OF CONTENTS
Safety ........................................................ 3
Product Features....................................... 5
Specications ............................................ 5
Qualied Installing Agency ........................ 6
Product Features....................................... 6
Local Codes............................................... 6
Unpacking.................................................. 6
Propane/LP Supply.................................... 7
Air For Combustion and Ventilation ........... 7
Installation ................................................. 9
Operation................................................. 16
Inspecting Heater .................................... 19
Care And Maintenance ............................ 20
Troubleshooting....................................... 21
Replacement Parts.................................. 28
Accessories ............................................. 28
Service Hints ........................................... 29
Technical Service..................................... 29
Warranty .................................................. 32
This heater can only be used in a recreational or com-
mercial enclosure with a window or roof vent. This
heater is not for outdoor use.

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SAFETY
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, op-
erate, or service this heater.
Improper use of this heater can
cause serious injury or death
from burns, fire, explosion,
electrical shock and carbon
monoxide poisoning.
Only a qualied installer, service
agent, or local gas supplier may
install and service this product.
WARNING: Keep the appli-
ance area clear and free from
combustible materials, gasoline,
and other ammable vapors and
liquids.
This heater is equipped for pro-
pane/LP gas. Field conversion
is not permitted.
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.
DANGER: Carbon monoxide
poisoning may lead to death!
CARBON MONOXIDE POISONING: Early
signs of carbon monoxide poisoning resemble
the u, with headaches, dizziness or nausea.
If you have these signs, the heater may not be
working properly. Get fresh air at once! Have
heater serviced. Some people are more af-
fected by carbon monoxide than others. These
include pregnant women, people with heart or
lung disease or anemia, those under the inu-
ence of alcohol and those at high altitudes.
PROPANE/LP GAS: Propane/LP gas is
odorless. An odor-making 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: Do not use any
accessories not approved for
use with this heater.
WARNING: Carefully super-
vise young children when they
are in the room with the heater.
WARNING: Make sure grill
guard is in place before running
heater.
WARNING: Due to high tem-
peratures, the appliance should
be located out of trafc and away
from furniture and draperies.
WARNING: Heater becomes
very hot when operating. Keep
children and adults away from
hot surfaces to avoid burns or
clothing ignition. Heater will re-
main hot for a time after shutoff.
Allow surfaces to cool before
touching.
WARNING: Do not place
clothing or other flammable
material on or near the appli-
ance. Never place any objects
in the heater.

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1. Do not place Propane/LP supply tank(s)
inside any structure. Propane/LP supply
tank(s) must be placed outdoors.
2. Heaters with a maximum input over
6,000 Btu/Hr shall not be installed in a
bathroom. Heaters with a maximum input
over 10,000 Btu/Hr shall not be installed
in a bedroom.
3. 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
7 and 8. If heater keeps shutting off, see
Troubleshooting, page 21.
4. Keep all air openings in front and bottom
of heater clear and free of debris. This will
ensure enough air for proper combustion.
5. If heater shuts off, do not relight until you
have provided fresh, outside air. If heater
keeps shutting off, have it serviced.
6. Do not run heater:
• Where ammable liquids or vapors are
used or stored.
• Under dusty conditions.
7. Always run heater with control knob at
PILOT/IGN, LOW or HIGH locked posi-
tions. Never set control knob between
locked positions. Poor combustion and
higher levels of carbon monoxide may
result.
8. Before using furniture polish, wax, carpet
cleaner, or similar products, turn heater off.
If heated, the vapors from these products
may create a white powder residue within
burner box or on adjacent walls or furniture.
9. Do not use heater if any part has been
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.
SAFETY
10. Turn off heater and let cool before servic-
ing. Only a qualied service person should
service and repair heater.
11. Operating heater above elevations of
4,500 feet could cause pilot outage.
12. Install and use heater with care. Follow
all local ordinances and codes. In the ab-
sence of local ordinances and codes, refer
to the Standard for Storage and Handling
of Liqueed Petroleum Gas, ANSI/NFPA
58 Installation Code, CAN/CGAB149.2.
This instructs on the safe storage and
handling of propane/LP gases.
13. This heater may be used in an approved
structure or temporary construction work
enclosure with a remote rellable pro-
pane/LP cylinder ONLY when the cylinder
is located outdoors and the heater is used
with the hose (included with this heater).
NEVER bring a refillable propane/PL
cylinder indoors. A re or explosion can
occur causing property damage, serious
injury or death.
14. Use only the hose and factory preset
regulator provided with the heater, when
connecting to portable supply gas tank.
Use only replacement pressure regula-
tors and hose assemblies specied in this
manual.
15. Inspect the hose before each use of the
heater. If it is evident there is excessive
abrasion or wear or the hose is cut, it must
be replaced prior to the heater being put
into operation.
16. Use only propane gas set up for vapor
withdrawal.

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MODEL ML100HBAHR ML100TBAHR
Ignition Piezo Piezo
Gas Type Propane/LP Gas Propane/LP Gas
BTU (available) 5,500/10,000 10,000
Pressure Regulator Setting 8" W.C. 8" W.C.
Inlet Gas Pressure*
(inches of water)
Maximum 14" Maximum 14"
Minimum 11" Minimum 11"
Heater Weight 13 lbs 14 lbs
Shipping Weight 16 lbs 17 lbs
Heater Dimensions (HxWxD) 19 1/8" × 14 1/8" × 6 3/8"
Carton Dimensions (HxWxD) 22" × 16 3/4" × 8 1/8"
SPECIFICATIONS
Note: Dimensions listed are outer most points on the heater (includes
control knobs and grill).
* For purposes of input adjustment.
PRODUCT FEATURES
Figure 1 - Vent-Free Gas Heater

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LOCAL CODES
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/NFPA 54*.
*Available from:
American National Standards Institute, Inc.
25 West 43rd Street
New York, NY 10036
National Fire Protection Association, Inc.
1 Batterymarch Park
Quincy, MA 02269-9101
State of Massachusetts: The installation
must be made by a licensed plumber or
gas tter in the Commonwealth of Mas-
sachusetts.
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 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.
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.
QUALIFIED INSTALLING AGENCY
Only a qualied agency should install and
replace gas piping, gas utilization equipment
or accessories, and repair and equipment ser-
vicing. The term “qualied agency” means any
individual, rm, corporation, or company that
either in person or through a representative
is engaged in and is responsible for:
a) Installing, testing, or replacing gas piping
or
b) Connecting, installing, testing, repairing,
or servicing equipment; that is experienced
in such work; that is familiar with all precau-
tions required; and that has complied with
all the requirement of the authority having
jurisdiction.
PRODUCT FEATURES
SAFETY PILOT
This heater has a pilot with an Oxygen Deple-
tion 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 a piezo ignitor.
this system requires no matches, batteries, or
other sources to light heater.
THERMOSTATIC CONTROL
(Thermostat Models Only)
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.

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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 provisions are provided
for adequate combustion and
ventilation air. Read the following
instructionstoinsure properfresh
air for this and other fuel-burning
appliances in your home.
Today’s homes are built more energy efcient
than ever. New materials, increased insulation
and new construction methods help reduce
heat loss in homes. Home owners weather
strip and caulk around windows and doors
to keep the cold air out and the warm air in.
During heating months, home owners want
their homes as airtight as possible.
While it is good to make your home energy
efcient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning ap-
pliances need fresh air for proper combustion
and ventilation.
Exhaust fans, replaces, clothes dryers and
fuel burning appliances draw air from the house
to operate. You must provide adequate fresh
air for these appliances. This will insure proper
venting of vented fuel-burning appliances.
WARNING: This heater shall
not be installed in a room or
space unless the required vol-
ume of indoor combustion air
is provided by the method de-
scribed in the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, the
International Fuel Gas Code, or
applicable local codes.
WARNING: If the area in which
the heater may be operated does
not meet the required volume for
indoor combustion air, combus-
tion and ventilation air shall be
provided by one of the methods
described in the National Fuel
Gas Code,ANSI Z223.1/NFPA54,
the International Fuel Gas Code,
or applicable local codes.
PROPANE/LP SUPPLY
Propane/LP gas and propane/LP tank(s) are
to be furnished by the user. The propane/LP
cylinder to be used must be constructed and
marked in accordance with the specications
for the propane/LP gas cylinders of the U.S.
Department of Transportation (DOT).
Use this heater only with a propane/LP vapor
withdrawal supply system. See Chapter 5
of the Standard for Storage and Handling
of Liqueed Petroleum Gas, ANSI/NFPA 58
and/or CAN/CGAB 149.2. Your local library
or re department will have this booklet. The
amount of propane/LP gas ready for use from
propane/LP tanks varies. Two factors decide
this amount:
1. The amount of propane/LP gas in tank(s)
2. The temperature of tank(s)
This heater is designed for use with a 20 or
40 pound rellable propane/LP cylinder when
used as a self contained heating system (with
hose and regulator). Larger tanks may be used
if installed in a permanent gas supply system.
The propane/LP cylinder used must include a
collar to protect the cylinder valve and a listed
over-lling prevention device (OPD).

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VENTILATION AIR
AIR FOR COMBUSTION AND VENTILATION
Outlet
Air
Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
Figure 2 - Ventilation Air from Inside
Building
Figure 3 - Ventilation Air from Outdoors
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills into
Adjoining
Room,
Option 1
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two perma-
nent openings: one within 12" of the ceiling
and one within 12" of the oor. 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, ANSI Z223.1/NFPA 54, 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
adjoining unconned space. The combined
spaces must have enough fresh air to supply
all appliances in both spaces.
Ventilation Air From Inside Building
This fresh air would come from an adjoining
unconned space. When ventilating to an
adjoining unconned space, you must provide
two permanent openings: one within 12" of the
ceiling and one within 12" of the oor 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, ANSI
Z223.1/NFPA 54, Air for Combustion and
Ventilation for required size of ventilation
grills or ducts.

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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 pri-
mary 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: When installing
heater in a home garage
• heater pilot and burner must
be at least 18" above oor
• locate heater where moving
vehicle will not hit it
WARNING: A qualied ser-
vice person must install heater.
Follow all local codes.
WARNING: Never install the
heater
• in a bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other ammable
objects are less than 36" from
the front, top, or sides of the
heater
• in high trafc areas
• in windy or drafty areas
When installed in a bathroom,
do not use ammable products
such as aerosol hair spray or
any product that contains am-
mable vapors. Keep towels and
other ammable materials away
from heater.
CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as to-
bacco smoke, aromatic candles,
cleaning uids, oil or kerosene
lamps, etc.) in the air exist, may
cause walls to discolor.
CHECK GAS TYPE
Be sure your gas supply is right for your heat-
er. Otherwise, call dealer where you bought
the heater for proper type heater.
CLEARANCES TO
COMBUSTIBLES
WARNING: Maintain the
minimum clearances shown
in Figure 4. If you can, provide
greater clearances from oor,
ceiling, and joining wall.
Figure 4 - Mounting Clearances as
Viewed From Front of Heater
CEILING
36"
Minimum
6"
Minimum
From
Sides of
Heater
Left
Side
Right
Side
2" Minimum to Top Surface of Carpeting,
Tile or Other Combustible Material
FLOOR

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INSTALLATION
Figure 6 - Mounting Bracket Location
Removing 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).
Figure 7 - Removing Front Panel Of
Heater
Figure 5 - Moving Thermostat Sensing
Bulb
Mounting Bracket
Hole for Installing Clip
Pull Out
LOCATING HEATER
This heater is designed to be mounted on
a wall.
For convenience and efciency, install heater:
1. Where there is easy access for operation,
inspection, and service.
2. In the coldest part of room.
INSTALLING THERMOSTAT
SENSING BULB
For Thermostat Model Only
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
Use only the last hole on each end of mount-
ing 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 pro-
vides 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).
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.

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Figure 8 - Mounting Bracket Clearances
Figure 9 - Folding Anchor
Figure 10 - Popping Open Anchor Wings
For Thin Walls
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 onto stand-out tabs on
mounting bracket.
INSTALLATION
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.
3. Insert wall anchor (wings rst) into hole.
Tap anchor ush 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).
IMPORTANT: Do not hammer anchor key! For
thick walls (over 1/2" 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 11 - Mounting Heater Onto
Mounting Bracket
Mounting
Bracket
(attached
to wall)
Horizontal Slots
Stand-Out Tab
12 1/8"
14 1/2"
Min.
63/4"
Min.
Adjoining Wall
Only Insert Mounting
Screws Through Last
Hole On Each End
Floor
Marking Screw Locations
1. Tape mounting bracket to wall where
heater will be located. Make sure mount-
ing bracket is level.
WARNING: Maintainminimum
clearances shown in Figure 4,
page 9. If you can, provide greater
clearances from oor and join-
ing wall.
2. Mark screw locations on wall (see Figure
8). 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 package. The hard-
ware 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"
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):

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INSTALLATION
Installing Bottom Mounting Bracket
1. Install bottom bracket to heater bottom
with two screws. It may be more conve-
nient 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 anchors.
Follow steps 1 through 4 under Attaching
To Wall Anchor Method, page 11. If install-
ing bottom mounting screw into wall stud,
drill holes at marked locations using 9/64"
drill bit.
6. Replace heater onto mounting bracket.
7. Place spacers between bottom mounting
holes and wall anchor or drilled hole.
8. Hold spacer in place with one hand. With
other hand, insert mounting screw though
bottom mounting hole and spacer. Place
tip of screw in opening of wall anchor or
drilled hole.
Figure 12 - Installing Bottom Mounting
Screws
Side View
Front View
9. Tighten both screws until heater is rmly
secured to wall. Do not over tighten.
Note: Do not replace front panel at this time.
Replace front panel after making gas connec-
tions and checking for leaks.
CONNECTING TO PORTABLE CYLINDER GAS SUPPLY
Wall
Spacer
Heater
WARNING: Review and un-
derstand the warnings in the
Safety section, page 3. They are
needed to safely operate this
heater. Follow all local codes
when using this heater.
WARNING: Test all gas piping
and connections for leaks after
installation or servicing. Never
use an open ame to check for
a leak. Apply a noncorrosive
leak detection uid to all joints.
Bubbles forming show a leak.
Correct all leaks at once.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
Never bring a rellable propane/
LP cylinder indoors. A re or
explosion can occur causing
property damage, serious injury
or death.
WARNING: This appliance
requires a 3/8" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualied ser-
vice technician must connect
heater to gas supply. Follow all
local codes.
IMPORTANT: You must use a propane/LP
gas supply cylinder that is compatible with
the connection device provided with the hose
and regulator.

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INSTALLATION
WARNING: A qualied ser-
vice technician 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.
WARNING: Do not over-
tighten gas connections.
1. Remove gas tting from hardware bag.
2. Apply pipe joint sealant lightly to male
NPT threads (see Figure 13). This will
prevent excess sealant from going into
pipe. Excess sealant in pipe could result
in clogged heater valves.
3. Hold gas pressure regulator with wrench
when connecting the gas tting. Do not
over tighten connection to regulator. The
regulator body could be damaged.
4. Provide propane/LP supply system (see
Propane/LP Supply, page 7).
5. Connect fuel gas tting on hose/regulator
assembly to propane/LP tank(s). Turn fuel
gas tting counterclockwise into threads
on tank. Tighten rmly using a wrench.
IMPORTANT: Position regulator so that
hose leaving the regulator is in a horizon-
tal position (see Figure 14). This places
the regulator vent in the proper position
to protect it from the weather.
6. Connect hose to heater inlet. Tighten
rmly using a wrench. You must use the
regulator supplied with heater.
7. Open propane/LP supply valve on pro-
pane/LP tank(s) slowly.
Note: If not opened slowly, excess-flow
check valve on propane/LP tank may stop
gas flow. If this happens, close propane/
LP supply valve and open again slowly.
Propane/LP
Tank
Propane/LP
Supply Valve
Regulator
Hose To
Heater
Fuel Gas
Fitting
Figure 14 - Regulator Position
Figure 13 - Gas Connection
Heater
Cabinet
Pressure
Regulator
Elbow
Hose To Regulator
Hose Fitting
Apply Sealant To
This End Only
8. Check all connections for leaks. Apply a
noncorrosive leak detection uid to gas
joints. Bubbles forming show a leak that
must be corrected.
9. Close propane/LP supply valve.
CONNECTING TO PERMANENTLY LOCATED GAS SUPPLY
(100 pound or Larger Tank)
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
1/2" diameter or greater to allow
proper gas volume to heater. If
pipe is too small, undue loss of
pressure will occur.

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INSTALLATION
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. Gas
supplierprovidesexternal regula-
tor for natural gas. The installer
provides the external regulator
for propane/LP gas.
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.
Before installing heater, make sure you have
the items listed below:
• external regulator for propane/LP unit only
(supplied by installer)
• piping (check local codes)
• sealant (resistant to natural gas and pro-
pane/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” NPT tap is an acceptable al-
ternative to test gauge connection. Purchase
the optional CSA design certied equipment
shutoff valve from your dealer.
Typical Inlet Pipe Diameters
Heaters up to 20,000 BTU/hr use 3/8" black
iron pipe or greater. 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 15).
IMPORTANT: Install an equipment shutoff
valve in an accessible location. The equipment
shutoff valve is for turning on or shutting off the
gas to the appliance.
Apply pipe joint sealant lightly to male threads.
This will prevent excess sealant from going
into pipe. Excess sealant in pipe could result
in clogged heater valves.
The installer must supply an external regulator. The
external regulator will reduce incoming gas pres-
sure. You must reduce incoming gas pressure to
between 11" and 14" 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 16. Pointing the
vent down protects it from freezing rain or sleet.
Figure 15 - Gas Connection
* Purchase the optional CSA design-certied equipment
shutoff valve from your dealer.
Equipment
Shutoff Valve
Ground
Joint
Union
Pressure
Regulator
3/8" NPT
Pipe Nipple
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test Gauge Connection*
Sediment
Trap
Tee
Joint
Pipe
Nipple
Cap
3" Min.
External Regulator with
Vent Pointing Down
Propane/LP
Supply Tank
From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure)
Figure 16 - External Regulator
with Vent Pointing Down

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INSTALLATION
Figure 17 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff Valve
LP REGULATOR INSTALL 2
Figure 18 - Checking Gas Joints
Gas Valve
Equipment
Shutoff Valve
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections for leaks after
installing or servicing. Correct
all leaks at once.
WARNING: Neveruse an open
ame to check for a leak. Apply
a noncorrosive leak detection
uid to all joints. If bubbles form,
there is a leak. Correct all leaks
at once.
PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect heater with its appliance main
gas valve (control valve) and equipment
shutoff valve from gas supply piping sys-
tem. Pressures in excess of 1/2 PSIG will
damage heater regulator.
2. Cap off open end of gas pipe where equip-
ment shutoff valve was connected.
3. Pressurize supply piping system by either
opening propane/LP supply tank valve
for propane/LP gas or opening main gas
valve located on or near gas meter for
natural gas or using compressed air.
4. Check all joints of gas supply piping sys-
tem. Apply a noncorrosive leak detection
uid to all joints. If bubbles form, there may
be 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 Fig-
ure 17).
2. Pressurize supply piping system by either
opening main gas valve located on or near
gas meter or using compressed air.
3. Check all joints from gas supply to equip-
ment shutoff valve (see Figure 18). Apply
a noncorrosive leak detection uid to all
joints. If bubbles form, there is a leak.
4. Correct all leaks at once.
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Fig-
ure 17).
2. Open gas supply tank valve.
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 18).
Apply a noncorrosive leak detection uid
to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operation, page 16).
Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas Ap-
pliance, page 18).
8. Replace lower front panel.
Propane/LP
Supply Tank
Install sediment trap in supply line as shown in
Figure 15, page 14. 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 contami-
nants. This keeps them from going into heater
controls. If sediment trap is not installed or is
installed wrong, heater may not run properly.

www.usaprocom.com 200052-01B16
OFF
HIGH
LOW
PILOT/IGN
OPERATION
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly, a
re or explosion may result caus-
ing property damage, personal
injury or loss of life.
A. This appliance has a pilot which must
be lighted by hand. When lighting the
pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell
next to the oor because some gas is
heavier than air and will settle on the oor.
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.
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 qualied
service technician. Force or attempted
repair may result in a re or explosion.
D. 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.
MANUAL CONTROL MODEL ML100HBAHR
LIGHTING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Check that gas supply to heater is on.
3. Push in gas control knob slightly and turn
clockwise to the OFF position.
Note: Knob cannot be turned from PILOT to
OFF unless knob is pushed in slightly. Do
not force.
4. Wait ve (5) minutes to clear out any gas.
Then smell for gas, including near the
oor. If you smell gas, STOP! Follow "B"
in the safety information above. If you do
not smell gas, go to the next step.
5. Push in gas control knob slightly and turn
counterclockwise to PILOT/IGN
and press for ve (5) seconds
Note: The rst time that the heater is oper-
ated after connecting the gas supply, the
control knob should be pressed for about
thirty (30) seconds. This will allow air to
bleed from the gas system.
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.
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 inter-
lock system. Wait one (1) minute before
lighting pilot again.
8. To select the desired heating level, partially
press down the control knob slightly and
turn counterclockwise . Release
downward pressure on the knob while
continuing to turn until the knob locks
at the desired setting. The main burner
should light. Set control knob to the de-
sired heating position.
Note: Both HIGH and LOW are locked
positions. You must press in the control
knob before turning it from these positions.
Figure 19 - Control Knob in the OFF
Position
Ignitor Button Control Knob

www.usaprocom.com 17200052-01B
Figure 20 - Pilot
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
OPERATION
Pilot Burner
Ignitor Electrode
Thermocouple
Figure 21 - Control Knob in the OFF
Position
1. STOP! Read the safety information on
page 16.
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 air.
Then smell for gas, including near the
oor. If you smell gas, STOP! Follow "B"
in the safety information, page 16. If you
do not smell gas, go to the next step.
5. Turn control knob counterclockwise
to the PILOT position. Press in control
knob for ve (5) seconds.
Note: The rst time that the heater is oper-
ated after connecting the gas supply,the
control knob should be pressed for about
thirty (30) seconds. This will allow air to
bleed from the gas system. If pilot does
not stay lit, refer to Troubleshooting, pages
21 though 23. Also contact a qualied
service technician or gas supplier for
repairs. Until repairs are made, light pilot
with match.
• If control knob does not pop up when
released, contact a qualified 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 grill. If needed, keep
pressing ignitor button until pilot lights.
Note: If pilot does not stay lit, refer to
Troubleshooting, pages 21 though 23.
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, page 18.
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 inter-
lock system. Wait one (1) minute before
lighting pilot again.
8. Turn control knob counterclockwise
to desired heating level. The main burner
should light. Set control knob to any heat
level between HI and LO.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
PILOT
LO
OFF
HI
Ignitor Button Control Knob
THERMOSTAT MODEL ML100TBAHR
LIGHTING INSTRUCTIONS

www.usaprocom.com 200052-01B18
THERMOSTAT CONTROL OPERATION
ALL MODELS
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.
OPERATION
MANUAL LIGHTING PROCEDURE
1. Remove lower front panel.
2. Follow steps 1 through 5 under Lighting
Instructions, page 16 or 17.
3. With control knob pressed in, strike match.
Hold match to pilot until pilot lights.
The thermostatic control used on these mod-
els differ from standard thermostats. Standard
thermostats simply turn the burner on and off.
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 HI and LO.
Note: The thermostat sensing bulb measures
the temperature of air near the heater cabinet.
This may not always agree with room tem-
perature (depending on housing construction,
installation location, room size, open air tem-
peratures, etc.) Frequent use of your heater
will let you determine your own comfort levels.
4. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Follow step 8 under
Lighting Instructions, page 16 or 17.
5. Replace lower front panel.

www.usaprocom.com 19200052-01B
1/2 Glass
Height
1/2 Glass
Height
Yellow
Tipping
Figure 22 shows a correct pilot ame pattern.
Figure 23 shows an incorrect pilot ame pat-
tern. The incorrect pilot ame is not touching
the thermocouple. This will cause the ther-
mocouple to cool, which shuts the heater off.
If pilot ame pattern is incorrect, as shown
in Figure 23
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 18)
• see Troubleshooting pages 21 through 23.
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide. If the burner ame
pattern shows yellow tipping,
follow instructions below.
Figure 19 - Correct Pilot Flame Pattern
Figure 23 - Incorrect Pilot Flame Pattern
IMPORTANT: Owner’s should check pilot ame pattern and burner ame pattern often.
Incorrect ame patterns indicate the need for cleaning (see Care and Maintenance,
page 20) or service.
WARNING: Only a qualied service person should service and
repair heater. This includes maintenance requiring replacement or
alteration of components.
PILOT FLAME PATTERN
Notice: Do not mistake orange flames with
yellow tipping. Dirt or other ne particles enter
the heater and burn causing brief patches of
orange flame.
BURNER FLAME PATTERN
Figure 24 shows a correct burner ame pat-
tern. Figure 25 shows an incorrect burner
ame pattern. The incorrect burner ame
pattern shows yellow tipping of the ame. It
also shows the ame higher than 1/2 the heat
shield height.
If burner ame pattern is incorrect, as shown
in Figure 25
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 18)
• see Troubleshooting pages 21 through 23.
INSPECTING HEATER
Figure 24 - Correct Burner Flame Pattern
Figure 25 - Incorrect Burner Flame
Pattern

www.usaprocom.com 200052-01B20
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
each use. Have heater inspected yearly by a qualied service techni-
cian. Heater may need more frequent cleaning due to excessive lint
from carpeting, bedding material, pet hair, etc.
WARNING: Failure to keep the primary air opening(s) of the
burner(s) clean may result in sooting and property damage.
The primary air inlet hole allows the proper
amount of air to mix with the gas. This pro-
vides a clean burning ame. Keep this hole
clear of dust, dirt and lint. Clean this air inlet
hole prior to each heating season. A blocked
air hole will create soot. We recommend that
you clean the unit every three months during
operation and have heater inspected yearly
by a qualied service person.
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.
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.
CABINET
Air Passageways
Use pressurized air to clean.
Exterior
Use a soft cloth dampened with a mild soap and water mixture. Wipe the cabinet to remove dust.
Figure 26 - Pilot Inlet Air Hole
Pilot Assembly
Pilot Air Inlet Hole
ODS/PILOT AND BURNER
CAUTION: Never use a wire, needle, or similar object to clean
ODS/pilot. This can damage ODS/ pilot unit.
Use a vacuum cleaner, pressurized air, or a small, soft bristled brush to clean.
BURNER PILOT AIR INLET
3. Blow air across the ports/slots and holes
in the burner.
4. Never insert objects into the pilot tube.
Clean the pilot assembly also. A yellow tip on
the pilot ame indicates dust and dirt in the
pilot assembly. There is a small pilot air inlet
about 2" from where the pilot ame comes out
of the pilot assembly (see Figure 26). With
the unit off, lightly blow air through the air
inlet. You may blow through a drinking straw
if compressed air is not available.
Ignitor ElectrodeThermocouple