Solaronics Residential Garage Heater User manual

Form RH-IOM-11
210080
Residential Garage Heater
Installation, Operation, & Maintenance
Instruction Manual
(Mount a copy of these instructions adjacent to the heater)
MODEL IDENTIFICATION
Record the information from the product identification label here for future reference.
Heater Model No.: _________________________ Heater Serial No.: ________________________
Rating: __________ BTUH Type of Gas: Nat ___ LP/Propane ___ Date Installed ____________
FOR YOUR SAFETY
IF YOU SMELL GAS:
1. Extinguish any open FLAME.
2. Do NOT try to light any appliance.
3. OPEN windows.
4. Do NOT touch electrical switches; do
NOT use any telephone in the house.
5. CALL your gas supplier immediately
from a NEIGHTBOR’S home. Follow the
gas supplier’s instructions.
6. IF you can’t reach your gas supplier,
CALL the FIRE DEPARTMENT.
FOR YOUR SAFETY
Do not store or use GASOLINE or other FLAMMABLE VAPORS or LIQUIDS in the vicinity of
this or any other appliance.
This unit is not to be installed in indoor living/sleeping areas.
!! WARNING !!
THESE INSTRUCTIONS must be carefully read and completely understood BEFORE
attempting to install , operate, or perform maintenance service on this GAS-FIRED
APPLIANCE. Installation and Service MUST be performed by a QUALIFIED service agency,
installer, contractor, or gas supplier. Failure to comply with the manufacturer’s instructions can
result in unsafe operation, property damage, personal injury, and/or death. A gas-fired
appliance can expose you to substances in fuel or from fuel combustion which have been
determined by the State of California to cause cancer, birth defects, or other reproductive
harm. Contact factory for further information. Keep these instructions for future reference.
EXPLANATION OF HAZARD INTENSITY LEVELS
DANGER: Failure to comply WILL result in severe personal injury, death, and/or property damage.
WARNING: Failure to comply could result in severe personal injury, death, and/or property damage.
CAUTION: Failure to comply could result in minor personal injury, and/or property damage.
This manual is to be left with the owner after installation of this unit.
OWNER: Store this manual in a safe place to furnish your serviceman with the necessary
information for servicing.
QUESTIONS? Call the factory: Monday – Friday 8 a.m. to 5 p.m. Eastern Time

2WARNINGS
•Protect yourself and others by observing all safety information.
WARNING CAUTION
FIRE OR EXPLOSION HAZARD
Can cause property damage, severe injury or
death.
•Read manual carefully before installing, or
servicing this equipment, or serious injury or
death may result.
•Check minimum clearance to combustibles to
make certain that heater is in a safe location.
Combustible items located too close to the
heater could cause a serious fire hazard. In
storage areas, signs for maximum permissible
stacking height to maintain clearance from the
heater to combustible materials must be
posted adjacent to the heater thermostats or in
the absence of such thermostats in a
conspicuous location.
•Operating the heater in an atmosphere
containing combustible dust or flammable
vapors is dangerous and may potentially result
in injury or death.
•Heaters must be oriented in such a way as to
maintain minimum clearances to vehicles
parked underneath them.
•This heater expands and contracts with each
cycle. The installation of the gas connection
and mounting hardware must accommodate
this movement; otherwise, a fire or explosion
hazard may occur.
•This heater is equipped with an automatic
ignition and does not contain a pilot. DO NOT
attempt to light the burner manually, this could
result in serious personal injury or fire hazard.
MECHANICAL HAZARD
•DO NOT use high pressure to test the gas
pipes with the burner still attached. This will
cause damage to the controls within the
burner requiring them to be replaced.
•If heater is being operated in an atmosphere
with a negative pressure or an atmosphere
containing contaminants, an outside
combustion air supply is required. Failure to
provide outside combustion air may allow
excessive heat to back up to the blower wheel
and bearings severely shortening service life.
•Correct inlet pressure is important to efficiency
and long lasting operation of the burner.
•The burner, tubing, and accessories expand
and contract with each cycle. The system
must be installed so that the mounting
hardware and gas line will accommodate
these changes.
•All models of these tube heaters include a
turbulator, which must be located inside the
last 10-foot (3.0 m) tube [Note: 15-foot (4.6 m)
models have the 10-foot (3.0 m) tube with
turbulator before the 5-foot (1.5 m) tube.]
•Before servicing the burner or removing the
cover panel, all electrical and gas supplies
must be disconnected.
•Give consideration to construction such as
partitions, storage racks, hoists, etc., and their
relation to the installation of the heater.
•The heater must be installed and serviced
ONLY by trained and qualified gas installation
and service personnel.
IMPORTANT
Failure to follow these instructions may result in property damage, injury or death.
These Residential Garage Heaters shall not be used in the following environments:
•Indoor living/sleeping quarters
•Enclosed swimming pools
•Outdoors
•Explosion-proof environments
•Process heating
•Contaminated atmosphere applications.
NOTE: Contact factory if in any doubt.

3
TABLE OF CONTENTS
•This instruction manual may not cover all details or variations in this equipment, or cover every possible
situation to be met in connection with installation, operation, or maintenance. Should problems arise that
are not covered sufficiently in these instructions, the purchaser is advised to contact the factory’s
engineering department for further information.
SECTION TITLES – summary of information included PAGE(S)
WARNINGS – precautions and important safety information 2
TABLE OF CONTENTS 3
INSTALLATION CODES – applicable codes and warnings 4-5
CLEARANCE TO COMBUSTIBLES – minimum distances from heater to combustible materials 6
MOUNTING CONSIDERATIONS – minimum heater mounting heights, high altitude considerations 7
OVERVIEW DRAWINGS – overview of combustion air supply, exhaust venting and installation 8-9
COMBUSTION AIR SUPPLY – outdoor air supply, maximum length of air supply pipe, air supply cap
specifications and indoor air supply 10
EXHAUST VENTING – outdoor exhaust venting, maximum length of exhaust vent pipe, vent cap
specifications 11
ELECTRICAL SUPPLY AND THERMOSTATIC CONTROL – electrical ratings, schematics, 24 and 120 VAC
thermostat arrangements, illustrations 12
OPERATION AND SHUTDOWN – sequence of operation, shutdown, burner wiring diagrams 13
GAS SUPPLY AND GAS PRESSURE – gas piping, inlet pressure and manifold pressure 14
STARTUP – procedures, burner diagram and ignitor diagram 15
MAINTENANCE – procedures with safety precautions 16
TROUBLESHOOTING – symptoms, possible causes and corrective actions 17
REPLACEMENT PARTS – exploded view of burner and part descriptions 19
U-TUBE INSTALLATION – horizontal or angled mounting of U-tube heaters 20
U-BEND REFLECTOR INSTALLATION – exploded view and instructions 21
BASIC SYSTEM CONFIGURATIONS – straight and U-tube configurations with component identification 22
COMBUSTION CHAMBERS/HEAT EXCHANGERS – components and specifications 23
INSTALLATION – preparation and installation 24-25
PRESS-FIT TUBE ASSEMBLY TIPS – helpful tips to assemble press-fit tubes 26-27

4INSTALLATION CODES (1 OF 2)
!! WARNING: READ THIS FIRST !!
Initial adjustment and light-off MUST be performed by qualified,
trained, and experienced personnel familiar with combustion systems,
electrical and gas control/safety circuitry, and overall installation.
Instructions provided by the company or individual responsible for the
complete installation of the entire system take precedence over those
provided by this instruction manual. If these instructions conflict with
local codes or regulations, contact the factory at the on the cover
BEFORE start-up. The installer MUST be familiar with all of the
various requirements and is responsible for compliance with
applicable codes.
AGENCY DESIGN CERTIFICATION:
CSA International (formerly A.G.A. and CGA).
•United States: A.G.A. Requirement No. 7-89
•Canada: CSA 2.32a-M99
GENERAL INSTALLATION & GAS CODES:
Heater must be installed ONLY for use with type of gas appearing on
its rating plate.
•United States: In the absence of local codes, installation must
comply with the National Fuel Gas Code ANSI Z223.1 (NFPA-54) -
latest edition.
•Canada: In the absence of local codes, installation must comply
with CAN/CGA B149.1 and B149.2 Installation Codes in Canada-
latest edition.
GAS SUPPLY LINES:
A 1/8 inch NPT plugged tap must be installed in the gas line
connection immediately upstream of the burner farthest from the gas
supply meter to check and confirm the system’s gas pressure.
•United States: Installation must comply with the National Fuel Gas
Code ANSI Z223.1 (NFPA-54)-latest edition.
•Canada: Installation must comply with CAN/CGA B149.1 AND
B149.2 Installation Codes in Canada-latest edition.

5
INSTALLATION CODES (2 OF 2)
!! WARNING: READ THIS FIRST !!
MANUAL GAS SHUT-OFF (CANADA ONLY):
A manual shut-off valve shall be of the plug, ball, or eccentric type
and it shall not be subjected to either a temperature or pressure
greater than its certified rating. A readily accessible manual shut-off
valve shall be installed to control the supply of gas to each heater and
the valve shall be located, in either the drop or riser, as close as
possible to the valve train of a commercial or industrial type
appliance.
ELECTRICAL:
All electric work, particularly grounding, must conform with all local
requirements and:
•United States: National Electric Code ANSI/NFPA 70-latest edition
•Canada: Canadian Electric Code CSA C22.1 – latest edition.
VENTING:
Refer to the following standards for proper location, sizing, and
installation of vents as well as information on clearance requirements
when passing through walls for venting purposes:
•United States: National Fuel Gas Code ANSI Z223.1 (NFPA-54)-
latest edition.
•Canada: CAN/CGA B149.1 and B149.2 Installation Codes in
Canada – latest edition.

6CLEARANCE TO COMBUSTIBLES
!! WARNING !! !! WARNING !! !! WARNING !!
The minimum clearances as
shown in the diagram below
MUST be maintained from
vehicles parked below this
heater. The radiant heat can
damage painted surfaces.
Failure to comply with these
clearances could result in
fire, property damage,
personal injury, and/or
death. Supervise young
children when in the same
room as the heater.
The area in all directions
surrounding the heater
MUST be kept clear from
combustible materials, and
other flammable vapors and
liquids.
1Minimum clearance specified below MUST BE maintained to combustible materials and any
other material that may be damaged by temperatures of 90°F above (50°C above) ambient
room temperature. The specified distance MUST BE maintained from the top surface of
carpeting, tile, etc.
2Minimum clearance to combustibles are also specified on each heater’s serial plate located
next to the blower on the burner.
3According to the National Fuel Gas Code, section 10.18.2(3), “In locations used for storage
of combustible materials, signs shall be posted to specify the maximum permissible stacking
height to maintain required clearances from the heater to combustibles.”
4
Carefully examine materials surrounding the heater. The stated clearance to combustibles
represents a surface temperature of 90°F above (50°C above) room temperature. Building
materials with a low heat tolerance (such as plastic, vinyl siding, canvas, tri-ply, etc.) may be
subject to degradation at lower temperatures and can be discolored or damaged. It is the
installer’s responsibility to assure that adjacent materials are protected from degradation.
5CHILDREN AND ADULTS SHOULD BE ALERTED TO THE HAZARDS OF HIGH
SURFACE TEMPERATURES ON THE HEATER, AND SHOULD STAY AWAY TO AVOID
BURNS OR CLOTHING IGNITION.
6CLOTHING OR OTHER FLAMMABLE MATERIALS SHOULD NEVER BE HUNG FROM
THE HEATER, OR PLACED ON OR NEAR THE HEATER. CERTAIN MATERIALS OR
ITEMS, WHEN STORED UNDER THE HEATER, WILL BE SUBJECTED TO RADIANT
HEAT AND COULD BE SERIOUSLY DAMAGED.
0°MOUNTING 1°– 30°MOUNTING 31°– 45°MOUNTING
•Reflector width = 15.75” (40 cm)
•Top, Front, and Rear clearances are measured from reflector.
•Below clearance is measured from bottom of tube.
•Clearance to combustibles measurements are given in inches and (centimeters).
CLEARANCES
APPLICABLE FOR
ALL HEATERS
Inches (Centimeters)
TOP OF REFLECTOR
12 (31)
END OF BURNER
12 (31)
END OF U-BEND
50 (127) 0° to 30° Reflector Angle 31° to 45° Reflector Angle
MBTUH (kW) FRONT REAR BELOW FRONT REAR BELOW
40
45
50
(11.7)
(13.2)
(14.6) 40 (102) 40 (102) 40 (102) 40 (102) 12 (31) 40 (102)
55
60 (16.1) (17.6) 50 (127) 50 (127) 50 (127) 50 (127) 12 (31) 50 (127)
MINIMUM MOUNTING HEIGHT: Bottom of tube to floor: 8 ft. (2.4 m) U.S.A., 7 ft. (2.1 m) Canada
TOP
TOP
FRONT
BELOW REAR BELOW
FRONT
REAR
TOP
BELOW
FRONT
REAR

7
MOUNTING CONSIDERATIONS
•Clearance to combustibles must be observed at all times.
•In all cases, minimum installation height: 8 ft. (240 cm) U.S.A., 7 ft. (214
cm) Canada, from floor ground level.
•The heater must be controlled by a thermostat, timer, or other
automatically operated device. On/off switches or direct wiring to a
circuit breaker are not allowed.
•Verify the buildings overhead structure has sufficient strength and
proper suspension means to support the weight of the heater
•Observe and verify all chains are plumb and vertical. A chain that is not
plumb and vertical may cause damage to the heater.
•To maximize the heater’s effectiveness to cover the space to be heated,
it is recommended the heater be hung as high as possible and along an
uncluttered wall to give the heater’s reflector the widest possible “view”.
•Leave enough space around the burner box to permit future servicing.
•Choose a location allowing easy installation of the vent piping system.
•Each suspension point must be capable of supporting a minimum of 150
lbs. (65 kg).
•Allow for heater’s movement during expansion and contraction through
the operation cycle.
•Heaters shall not be installed in living/sleeping areas.
•U-tube heaters must have a reflector installed over the U-bend tube.
CAUTION: HIGH ELEVATION
•If a heater is to be installed at a high elevation, in excess of 2000 feet
(610 m) above sea level, the installer is advised to verify it has been
properly factory modified for this application in accordance with the
National Fuel Gas Code.

8OVERVIEW DRAWINGS (1 OF 2)
4 FT. (1.2m)
MIN.
8FT.
(2.4m)
MAX.
TYP.
HANGER BRACKETS MUST BE
SPACED AT LEAST 4 FT. (1.2m) APART
WITH (2) BRACKETS FOR EVERY
SECTION OF RADIANT TUBING
FIRST TUBE SUSPENSION POINT SHOULD BE
(18) IN. (46cm) FROM THE BURNER BOX
VENT CAP MUST BE
6" (15cm) HIGHER
THAN SNOW DEPTH
12"(30cm) MIN.
CLEARANCE
ALL HANGING CHAINS MUST BE PLUMB
AND VERTICAL IN ALL DIRECTIONS WHEN
INITIALLY INSTALLED
VENT CAP
MUST BE 6 IN. (15cm)
HIGHER THAN SNOW
DEPTH
ROOF FLASHING
(NOT SUPPLIED)
BURNER
HEAT EXCHANGER 4 IN.
(10cm) O.D. X 5 OR 10 FT.
(1.5m OR 3.0m) LONG
REFLECTOR
INDEPENDENTLY ADJUSTABLE
COMBUSTION CHAMBER
4 IN. (10cm) O.D. X 10 FT. (3m) LONG
ADDITIONAL COMBUSTION AIR SUPPLY
4 IN. DIA. SINGLE WALL GALVANIZED SHEET METAL PIPE
(SEAM TO BE AT TOP) OR SCHEDULE 40 PVC
(NOT SUPPLIED)
INLET AIR SLEEVE
(SEAM TO BE ON TOP)
4 IN. (10cm) I.D. FLEX DUCT
18 IN. (46cm) LONG WITH
(2) HOSE CLAMPS
SUPPLY PIPING MUST NOT EXCEED AN EQUIVALENT
OF 35 LINEAR FT. (10.7m) FOR 40-60 MBTUH (11.7-17.6kW).
NO MORE THAN TWO 90° ELBOWS MAY BE USED.
A 90° ELBOW IS EQUIVALENT TO 10 LINEAR FT. (3m).
29 IN.
(74cm)
4" B-VENT ADAPTOR (BY OTHERS)
INLET AIR CAP
ACCESSORY
"B" VENT
PIPE ADAPTOR

9
OPTIONAL COMMON VENTING THROUGH ROOF OR WALL
BOTH HEATERS MUST BE CONTROLLED
BY A SINGLE THERMOSTAT
4" x 4" x 5" Y-COUPLER
(10 x 10 x 13cm) (OPTIONAL ACCESSORY)
FOR ALL JOINTS RTV
SILICONE ADHESIVE
SEALANT SHOULD BE
USED TO PREVENT
LEAKAGE OF HOT
FLUE GASSES.
2 FT. (61cm) MIN.
3.0" (7.6cm) MIN.
4.0" (10cm) MAX.
4"(10cm)
VENT CAP
ASSEMBLY
FOR ALL INDOOR VENT JOINTS: USE RTV SEALANT TO PREVENT HOT FLUE GAS LEAKAGE INTO THE
BUILDING (USE A SHEET METAL PIPE AND CRIMPER FOR JOINING IDENTICAL SIZE SHEET METAL PIPES),
USE THREE (3) #6 SHEET METAL SCREWS (SMS) PER VENT PIPE JOINT. THE VENT PIPE SEAM SHOULD
BE ON TOP WITH ONE SMS ON TOP AND ONE SMS 120 DEGREES FROM THE TOP ON EACH SIDE.
FOR COMBUSTIBLE WALLS ONLY
USE A 2" (5cm) CLEARANCE
NON-COMBUSTIBLE VENTILATING
METAL THIMBLE (NOT SUPPLIED).
FOR NON-COMBUSTIBLE WALLS
ONLY 4.25" (11cm) DIA. HOLE
FOR 4" (10cm) O.D. PIPE ADD
NON-COMBUSTIBLE PROTECTION
AROUND THE HOLE IF NECESSARY.
USE APPROPRIATE FASTENER (NOT SUPPLIED)
FOR ATTACHING TO BUILDING MATERIAL
FLOW OF HOT GASES
BURNER
#12 TEK SCREW
4 PLACES WELD SEAM TO BE AT TOP
COMBUSTION CHAMBER
BURNER COUPLER
BURNER COUPLER MOUNTING ARRANGEMENT
TUBE WELD SEAM
ON TOP
#12 TEK SCREW
TUBE WELD SEAM
ON TOP
HEAT EXCHANGER MOUNTING ARRANGEMENT
4" (10cm) WALL VENT CAP
ALTERNATE ACCESSORY
ADDITIONAL EXHAUST VENT PIPING 4" (10cm) I.D.
SINGLE WALL GALVANIZED SHEET METAL (OR OTHER
FACTORY-APPROVED MATERIALS) (SEAM TO BE ON TOP)
(NOT SUPPLIED) MUST NOT EXCEED AN EQUIVALENT
OF 35 LINEAR FT. (10.7m) FOR 40-60 MBTUH (11.7-17.6kW).
NO MORE THAN 2 ELBOWS MAY BE USED. A 90° ELBOW IS
EQUIVALENT TO 10 LINEAR FT. (3m). A 45° ELBOW IS
EQUIVALENT TO 5 LINEAR FT. (1.5m).
MAINTAIN 18 IN. (46cm) MINIMUM
CLEARANCE TO COMBUSTIBLES
FOR ENTIRE LENGTH OF PIPING
WALL
VENTING
KIT
(3) 90 DEGREE BRACES EQUALLY SPACED
2 FT. (61cm) MINIMUM
CLEARANCE ABOVE OR
BEYOND THE HIGHEST
STRUCTURE OF SURFACE
WITHIN 10 FT. (3m)
OF THE VENT
WALL BRACE
OVERVIEW DRAWINGS (2 OF 2)
NOTE
This drawing is for general reference only! It shows only general design
guidelines and it does not provide construction details.
CAUTION
•A U-Tube heater may have a180 degree U-bend interposed AFTER the
first ten (10) feet (3.0 m).
•Electrical wiring diagrams can be found in the ELECTRICAL SUPPLY
AND THERMOSTATIC CONTROL section.
•The heater must be controlled by a thermostat, timer or other
automatically operated device.

10
INLET AIR SLEEVE ACCESSORY
(SEAM TO BE AT TOP)
TWO HOSE CLAMPS
INLET AIR
COLLAR
ACCESSORY
COMBUSTION AIR SUPPLY
PIPING 4 IN. (10 CM) I.D.
(BY OTHERS)
SUPPORT AS NEEDED.
FLEX DUCT ACCESSORY
4 IN. (10 CM) I.D.
18 IN. (46 CM) LONG
INLET AIR WALL CAP
ACCESSORY
REQUIRES 4IN. (10 CM) B-VENT ADAPTOR
(BY OTHERS)
ROOF VENTING CAP USED FOR INLET AIR MUST BE
6 IN. (15 CM) HIGHER THAN SNOW DEPTH.
COMBUSTION AIR SUPPLY PIPING
4 IN. (10 CM) I.D. (BY OTHERS)
SUPPORT AS NEEDED.
ROOF VENTING CAP
4 IN. (10 CM) I.D.
INLET AIR
SLEEVE
ACCESSORY
(SEAM TO
BE AT TOP)
INLET AIR COLLAR
ACCESSORY
FLEXIBLE DUCT
ACCESSORY
4 IN (10 CM) I.D.
COMBUSTION AIR SUPPLY
WARNING This heater is NOT an explosion-proof heater. Where the possibility of exposure to
volatile or low flash point material exists, it could result in severe personal injury, death,
and/or property damage. Consult your local fire marshal or insurance agency to
determine the classification of the building to be heated.
•Atmospheric air for combustion may come from either outdoors or indoors (within the building).
•Installation of combustion air supply must comply with the instructions, drawings, and installation notes provided in this
section. OUTDOORS INDOORS
•When combustion air is to be taken from inside a
tightly sealed or closed building, an opening must be
installed to supply the burner with sufficient air for
combustion.
•The opening must be made so that for every 1,000
BTUH (293W) of the total input of all gas-fired
equipment, one square inch (6.5cm2) or more of free
area opening is provided.
•If combustion air is supplied from the space to be
heated, it must be free of contaminants that may
interfere with the proper and safe operation of the
heater. Some contaminants like halogenated
hydrocarbons or other corrosive elements may shorten
the life of the heater.
IMPORTANT
•MAXIMUM LENGTH OF AIR SUPPLY PIPE: For all
systems, total linear (straight) pipe run must not
exceed (35) thirty-five feet (11m) within the building.
A 90-degree elbow is equivalent to (10) ten linear feet
(3m). No more than (2) two 90-degree elbows are
permitted.
•In buildings contaminated with excessive dust or dirt,
containing substances which when combined with flame
and exhaust products result in corrosive gases, or those
under a negative pressure, combustion air must be taken
from outdoors.
•Outdoor air supply may be accomplished by bringing air
inside through piping from either the roof or wall as
shown below.
•The inlet air roof venting cap (roof) or inlet air box (wall)
must be located at least (3) three feet (1m) away from
any vent termination and in a manner preventing
blockage by snow.
•Components used to bring in outdoor air, when supplied
by others, must be identical to those specified in this
manual and be Metalbestos brand or equal. NO
SUBSTITUTIONS.
•Single wall 4” (10cm) diameter galvanized pipe or
schedule 40 PVC pipe is recommended for combustion
air supply piping.
•It may be necessary to insulate the inlet air supply piping
to eliminate condensation from warm inside air on the
piping.
•In very extreme cases, for protection against any exterior
contaminants, a blower enclosure may be installed. The
outdoor air supply piping is then attached to the
enclosure.
•DO NOT use collapsible material such as dryer duct
as a substitute for single wall galvanized or PVC pipe.
It will restrict air flow to the burner causing improper
operation.
•Inlet air piping must be well supported since additional
stress may be encountered due to be expansion
during heater operation.
•Outdoor air must be free of contaminants.
•A minimum of (3) three feet (1m) is required between
the inlet air roof venting cap and the nearest vertical
vent terminal on a roof.
•If the inlet air roof venting cap is within (10) ten feet
(3m) of a vertical vent terminal on a roof, the vertical
vent terminal must be at least (12) twelve inches
(31cm) higher than the inlet air roof venting cap.
THRU-THE-WALL THRU-THE-ROOF

11
ROOF
VENTING
CAP
4 IN. (10 CM)
VENT PIPE
ADAPTOR WALL BRACE
4 IN.
(10 CM)
VENT PIPE
A'SSY
ROOF VENTING CAP MUST BE 6 IN. (15 CM) HIGHER THAN SNOW DEPTH.
ADDITIONAL 4 IN. (10 CM)
EXHAUST VENT PIPING
(BY OTHERS)
MAINTAIN 18 IN. (46 CM) MINIMUM
CLEARANCE TO COMBUSTIBLES
FOR ENTIRE LENGTH OF PIPING
ROOF FLASHING
(BY OTHERS)
4 IN. (10 CM)
VENT PIPE
ADAPTOR
ROOF VENTING CAP
B VENT PIPE
ADAPTOR
(3) 90°
BRACES
EQUALLY
SPACED
EXHAUST VENTING
WARNING This heater is NOT an explosion-proof heater. Where the possibility of exposure to
volatile or low flash point material exists, it could result in severe personal injury, death,
and/or property damage. Consult your local fire marshal or insurance agency to
determine the classification of the building to be heated.
•ALL heaters must be directly vented outdoors; NO EXCEPTIONS!Never vent exhaust products indoors.
•Installation of exhaust venting must comply with the instructions, drawings, and installation notes provided
in this section.
DIRECT OUTDOOR VENTING IMPORTANT
•MAXIMUM LENGTH OF EXHAUST VENT PIPE: For all
systems, total linear (straight) pipe run must not exceed
(35) thirty-five feet (11m) within the building. A 90-degree
elbow is equivalent to (10) ten linear feet (3m). No more
than (2) two 90-degree elbows are permitted.
•Exhaust venting may be accomplished by passing flue
products through piping in the roof or wall as shown below.
•Components used to exhaust vent outdoors, when supplied by
others, must be identical to those specified in this manual and
be Metalbestos brand or equal. NO SUBSTITUTIONS.
•Use single wall 4” (10cm) diameter galvanized metal pipe for
exhaust vent piping.
•Use RTV silicone adhesive sealant liberally at all vent pipe
joints.
•Use (3) three #6 sheet metal screws per vent pipe joint.
•Allow 18” (46cm) clearance from single wall metal pipe to
combustible materials throughout the entire length of exhaust
vent piping.
•Where a single wall metal pipe passes through a wall/roof of
combustible material, a minimum 2” (5cm) clearance non-
combustible ventilated metal thimble (not supplied) MUST be
installed in wall/roof at the point of passage. If thimble is not
used, all combustible material MUST be removed a minimum
of 18” (46cm) in all directions from the metal pipe.
•Heater must not be vented in between buildings less than (10)
ten feet (3m) apart or above public walkways, doors or
windows.
•DO NOT use collapsible material
such as dryer duct as a substitute for
single wall galvanized pipe. It will melt
and/or restrict airflow from the burner
causing improper operation.
•Exhaust vent piping must be well
supported since additional stress may
result due to expansion during heater
operation.
•NEVER vent into a chimney or use a
draft hood, flue collar, or any other
device in the exhaust venting of this
heater!
•A minimum of (3) three feet (1m) is
required between the inlet air cap and
the nearest vertical vent terminal on a
roof.
•The use of double wall ‘B’ vent pipe
inside the building is limited to
equipment with neutral or negative
internal pipe pressure. It is not
recommended for use with this
heater.
•Each vent pipe connecting joint
MUST be sealed to prevent hot flue
gas leakage into the building.
•See OVERVIEW DRAWINGS section
for more venting information.
THRU-THE-WALL OR ROOF EXHAUST VENT DISTANCE FROM:
BELOW
Inches
(cm)
BESIDE
Inches
(cm)
ABOVE
Inches
(cm)
Door n/a 48 (122) n/a
Window 48 (122) 12 (30) n/a
Gravity Air Inlet n/a n/a 12 (30)
Forced Air Inlet
Within 10 ft. (3m) n/a n/a 36 (91)
Grade n/a n/a 12 (30)
•Do not install exhaust vent cap under eaves.
Gas Meters &
Electric Meters,
Regulators &
Relief Valves n/a 48 (122) n/a

12
PROPER GROUNDING AND POLARITY ARE ESSENTIAL
TO THE SAFE OPERATION OF THE HEATER.
NOTE: ALL COMPONENTS SUPPLIED BY OTHERS.
(GROUND)
GREEN
(NEUTRAL)
WHITE
(HOT)
BLACK
FACTORY SUPPLIED
POWER CORD
FROM BURNER
120 VOLT
THERMOSTAT
WIRING BY INSTALLER
120 VAC - 1 PHASE - 60 HERTZ
(3 WIRE SERVICE)
RECEPTACLE
(BY OTHERS)
PROPER GROUNDING AND POLARITY ARE ESSENTIAL
TO THE SAFE OPERATION OF THE HEATER.
(NEUTRAL)
(HOT)
BLACK
WHITE
(GROUND)
GREEN
24 VOLT THERMOSTAT
120 VAC - 1 PHASE - 60 HERTZ
(3 WIRE SERVICE)
BLACK
BLACK
WHITE BROWN
RED (HOT)
TRANSFORMER/RELAY
(MOUNTED TO 4X4
JUNCTION BOX
PROVIDED BY OTHERS)
RECEPTACLE
(BY OTHERS)
(NEUTRAL)
(GROUND)
GREEN GROUND
SCREW IN 4X4
JUNCTION BOX
WIRE NUT SYMBOL
WIRING BY INSTALLER
NOTE: ALL COMPONENTS SUPPLIED BY OTHERS.
FACTORY SUPPLIED
POWER CORD
FROM BURNER
W
Y
R
G
C
ELECTRICAL SUPPLY AND THERMOSTATIC CONTROL
ELECTRICAL SUPPLY 120 VAC SUPPLY & 120 VAC THERMOSTATIC CONTROL
•Voltage: 120VAC - 1 phase - 60 Hz.
•Maximum Amps: 3.0 (1.47 actual full
load)
•Flame safety: Electronic.
•Ignition: Direct Spark.
•Wiring must conform to the latest
edition of the National Electric Code
(ANSI/NFPA 70) or local code legally
authorized.
•Electrical power takeoff must be
connected to a separately fused circuit
with a disconnect or a circuit breaker,
and must be properly polarized and
grounded to the heaters power cord.
The heater control is polarity sensitive
and will not operate properly if the
electrical supply is not wired correctly.
•Do not run wiring over the heaters or in
direct view of radiant heat.
•If any of the wiring supplied must be
replaced use type 16 AWG (1.0mm2),
or equivalent with 2/64” (.08cm)
insulation and a minimum insulation
temperature of 302°F (150°C).
WARNING 120 VAC SUPPLY & 24 VAC THERMOSTATIC CONTROL
•ELECTRICAL GROUNDING
INSTRUCTIONS. This heater is
equipped with a three-prong
(grounding) plug for your protection
against shock hazard and should be
plugged directly into a properly
grounded three-prong receptacle. DO
NOT cut or remove the grounding
prong from this plug.
IMPORTANT
•The Residential Garage Heater MUST
be controlled by a thermostat, timer, or
other automatically operated device.
GENERAL INSTALLATION NOTES
•Locate the thermostat as specified in
the heating plan.
•If it is not in the heating plan, follow the
instructions provided with the
thermostat.
•If instructions are not provided with the
thermostat, locate it 4 to 5 feet (120 to
150cm) above the floor where it will
not be directly affected by the heat
from the heater, outside drafts, or the
sun.

13
- WIRE NUT SYMBOL
PL-1
BLACK
AIR FLOW SWITCH
HIGH VOLTAGE LEAD WIRE
WHITE YELLOW
GREEN
GROUND
SCREW
(35-725)
IDC
BLACK
RED
WHITE
GREEN
RED RED
N
BLACK
BLACK N
BLACK
BLACK
BLACK
GREEN
WHITE
YELLOW
SPARK
GROUND
SENSOR
PL-3
PL-2
BLACK
GAS VALVE
BLACK WHITE
BLACK
N
BLACK
GREEN
WHITE
115V.-1PH.-60HZ.
FAN MOTOR WHITE
(HOT)
(NEUTRAL)
(GROUND)
(+) (-)
HI-VOLTAGE WIRE
CHASSIS GROUND
120V.-1PH.-60HZ.
IDC
35-725
YELLOW
WHITE
BLACK
WHITE
RED
GREEN
BLACK
BLACK
BLACK
RED
AIR FLOW SWITCH
AF-1 RED
PL-3
BLACK
SPARK
GROUND
SENSOR
GAS VALVE
BURNER
OPERATION
NORMAL
BLACK
WHITE
WHITE
GREEN
PL-2
PL-1
FAN
MOTOR
AIR
PRESSURE
NORMAL
POWER ON
FAN MOTOR
BLACK
BLACK
GAS VALVE
(+) (-)
(HOT) (NEUTRAL)
(GROUND)
BLACK
BLACK WHITE
OPERATION AND SHUTDOWN
SEQUENCE OF OPERATION WIRING CONNECTION DIAGRAM
If any of the original wire as supplied with the appliance must be replaced, it must be replaced with
wiring material having a temperature rating of at least 302°F (150°C) and shall have a minimum
size of 16 AWG (1.0mm2).
WIRING SCHEMATIC LADDER DIAGRAM
•Thermostat calls for heat.
•120 VAC is applied to the blower and
validation light PL-1 indicates power is
ON.
•Air flow switch closes contacts after it
senses an increase in air pressure due to
fan reaching operational speed.
•Validation light PL-2 indicates
combustion air supply and exhaust
venting backpressure is normal.
•Ignition Detection Control (IDC) is turned
on and begins a pre-purge time period.
•A spark is developed at the igniter and
the gas valve is opened to the first step
of its two step operation.
•Burner ignites and 5 seconds later the
gas valve steps up to its operating
position. DC electrical current flows from
sensing electrode through flame to
ground.
•IDC senses flame presence, turns OFF
spark, gas continues flowing through
valve.
•Validation light PL-3 indicates normal
burner operation.
•During first trial-for-ignition period or
upon any flame outage at sensing
electrode, the IDC responds and begins
sparking within 0.8 seconds. A 15-
second trial-for-ignition period begins to
re-light the burner. If flame is re-
established, normal operation resumes.
If the burner does not light after first try,
the inter-purge sequence is completed
between trials to re-light the burner. If
the burner fails to light (10DX-117) or
after third trial (35-725), IDC will de-
energize the valve and go into lockout
mode.
•For lockout recovery, reset thermostat
below ambient temperature or
disconnect electrical power supply for
five (5) seconds.
•If the flame does fail during ignition or
normal operation, it is detected by the
flame sensor rod, and the IDC then
closes the gas valve locking out the
system until the thermostat is cycled to
the OFF position.
•When the thermostat is satisfied, the
whole system is de-energized until
another call for heat.
•When installing or servicing this heater,
wait at least 5 minutes between attempts
for ignition. SHUTDOWN
•To shutdown the heater for a week or
less, switch off the electrical supply to
the heater.
•To shutdown the heater for more than
one week, switch off the electrical supply
to the heater and turn off the gas supply
at the gas isolation valve.
If any of the original wire as supplied with the appliance must be replaced, it must be replaced with
wiring material having a temperature rating of at least 302°F (150°C) and shall have a minimum
size of 16 AWG (1.0mm2).

14
A
A
A
A
MP
RA
WA
LB
J
K
IP
A
FH
E
D
G
C
GAS SUPPLY AND GAS PRESSURE
GAS SUPPLY PIPING INLET GAS PRESSURE
•Inlet gas pressure must be measured on the inlet side of the
valve at the inlet test point (IP). Remove plug from the inlet
test point, connect to manometer.
•Inlet gas pressure must conform to the following:
MINIMUM
GAS TYPE INLET PRESSURE
Natural 6” WC (15 cm WC)
LP/Propane 11” WC (28 cm WC)
MAXIMUM
GAS TYPE INLET PRESSURE
Natural 14” WC (35 cm WC)
LP/Propane 14” WC (35 cm WC)
IMPORTANT
•Gas piping must be installed in accordance with
local codes and/or the National Fuel Gas Code,
ANSI Z223.1 / NFPA 54-latest edition.
•All pipe connections must have pipe joint compound,
resistant to LP/propane gas action.
•Piping must have drip leg and a ground joint union.
•Local codes may require shut-off cock ahead of the
drip leg.
•Use only agency approved flexible gas connector
furnished with heater. See WARNING.
•Use swing or swivel joint in addition to rigid piping if
local codes prohibit use of a flexible gas connector.
•Installer provide 1/8” NPT plugged tapping for inlet
test point connection immediately upstream of gas
connection to heater.
•Isolate regulators, flexible gas connectors, and
heaters during high-pressure leak testing.
•All gas lines must be purged of air before startup.
•Inlet gas pressure at inlet test point (IP) cannot be more than
14 inches of Water Column (WC) (35 cm WC) (1/2 PSI),
confirmed by actual field test. (Heater on or off).
WARNING HIGH GAS PRESSURE
•When inlet gas pressure is greater than 14 in. WC (35 cm
WC) a positive lockout type high-pressure regulator must be
installed in the gas line ahead of the heater.
•High-pressure regulators will NOT turn off the flow of gas.
•Always check local codes for gas venting requirements for
high-pressure regulators.
•An over-pressure protection device (OPD) may be required in
certain jurisdictions.
MANIFOLD GAS PRESSURE
•Connector must be installed in a “ ” configuration.
Use only the 24” (61 cm) or 36” (91 cm) long
connector of 1/2” (13 mm) nominal ID that was
furnished with the heater.
•Stress from expansion and contraction of heater
may cause excessive wear on the gas connection.
•For a heater 20 feet (6.1 m) long, heater tubes can
expand up to 1.1” (28 mm).
•It is important to maintain dimensions on drawing
below.
GAS PRESSURE MEASUREMENTS
•Use only a water or red oil manometer to make
measurements --- NOT A DIAL GAUGE.
•Make measurements and adjustments when this
heater and ALL other gas burning equipment
connected to the same gas meter are operating at
maximum capacity.
•Set inlet pressure first. Fluctuations in inlet pressure can
alter manifold pressure coming out of the gas valve.
•See drawing below for manifold pressure adjustment location.
•Loosen set screw, or remove plug form manifold test point
(MP); connect to manometer.
•Remove the slotted cap screw covering the manifold
adjustment.
•Turn adjustment screw clockwise to increase pressure or
counterclockwise to decrease pressure.
•Manifold Pressure setting is 3.5” WC (8.9 cm WC).
GAS CONNECTOR – CORRECT POSITIONS Item Description
AHeater movement
BGas supply nipple must be parallel to
heater movement
CHard piping
DFlexible gas connector
E3” (7.62 cm) maximum displacement
F12” (30 cm)
GVertical (as shown at left) – end view
HAlternate positions okay – end view
JGas cock shut-off (by others)
KDrip leg
GAS CONNECTOR – INCORRECT POSITIONS LRegulator required when pressure
exceeds 14” (35 cm) WC (by others)
IP Installer provide inlet test point
MP Manifold test point
RA Robert Shaw or Sit valve manifold
pressure adjustment
WRONG WRONG WRONG WRONG WA White Rodgers valve manifold pressure adjustment
CAUTION
Excessive torque on the burner gas inlet pipe or manifold may cause damage to burner. Always use two (2) wrenches when
making pipe connections. Check for leaks with non-corrosive gas leak detection fluid. DO NOT USE FLAMES! Thoroughly
rinse with clean water to remove leak detection fluid.
U

15
136
9
1011
12
13
7
17 16
18
20
19
8
45
2
15 14
STARTUP
STARTUP PROCEDURES SPARK IGNITOR
Item Description
ASpark gap
5/32” (.156”) (4.0 mm)
+/- 1/32” (.031”) (.8 mm)
BSensor gap .208” (5.3
mm) reference
CSpark electrode
DGround prong
•CAUTION: Verify electrical supply is shut off before removing burner cover.
Verify gas supply is shut off before removing gas pipe plugs and connecting
manometers to measure gas pressures.
•IMPORTANT: Check serial plate for requirements and factory settings. Check and,
if necessary, adjust the inlet gas pressure BEFORE checking the manifold gas
pressure. Then adjust the manifold gas pressure, if necessary.
•Remove the burner cover by removing the 4 sheet metal screws from the topside of
the burner cover.
•Remove the 1/8 NPT pipe plug from the inlet test point (IP) and connect manometer.
See the GAS SUPPLY AND GAS PRESSURE section.
•Loosen, Do Not Remove, the set-screw, or remove the 1/8 NPT pipe plug from the
manifold test point (MP) on the gas valve (break the tamper seal) and connect
manometer. See the GAS SUPPLY AND GAS PRESSURE section.
•Some models have a shutoff dial on the gas valve. Depress the dial on the gas
valve, and make sure the gas valve is in the ON position.
•Turn on the electrical and gas supply and set the thermostat above the ambient room
temperature, to call for heat.
•Measure the inlet gas pressure and the manifold gas pressure.
•For proper sequence of operation see the OPERATION AND SHUTDOWN section.
•If heater does not operate normally, see the TROUBLESHOOTING section.
•Once startup testing is complete, turn off electrical and gas supply, remove the
manometer connections and replace the 1/8 NPT pipe plugs or tighten the set-screws
into the inlet and manifold test points. Turn on electrical and gas supply and check
again for gas leaks. See the GAS SUPPLY AND GAS PRESSURE section.
•Cycle the heater several times by means of the thermostat, allowing at least five
minutes between cycles. If the heater operates normally, replace the burner cover
and screws.
•If the heater is vented directly outdoors, observe and verify the flue gases exiting
from the exhaust vent are not impinging on building materials or equipment. See the
EXHAUST VENTING section. EFlame sensor
BURNER DIAGRAM
Item Description Item Description Item Description
1Safety chain bracket 8Inlet test point (IP) 15 Air flow switch
2Tubing adapters 9Gas inlet ½“ NPT 16 Air orifice plate
3Main orifice 10 Gas valve 17 Inlet air collar accessory
4Vinyl tubing 11 Manifold test point (MP) 18 Blower
5Burner core assembly 12 Ignition lead wire
6Ignitor bracket 13 Ignition detection control (IDC) 19 Blower motor enclosure
accessory
7Observation port 14 Validation lights 20 Inlet air collar accessory
AIR FLOW SWITCH TUBING CONNECTIONS
•The switch “P1” or “+” or “HIGH” side tube goes toward the blower side.
•The switch “P2” or “–” or “LOW” side tube goes toward the ignitor side.
A
B
CDE

16 MAINTENANCE
•FOR SAFETY REASONS, BEFORE PERFORMING ANY MAINTENANCE, DISCONNECT AND
LOCKOUT THE ELECTRICAL SUPPLY, INCLUDING THE THERMOSTAT, BY POSITIVE MEANS.
•All maintenance and/or repair MUST be performed by someone trained and qualified to work on gas and electrical
equipment.
•Annual maintenance done prior to the beginning of each heating season is all that is usually necessary.
•In dirty, dusty, or wet atmospheres, it may be necessary to examine and perform needed maintenance at additional
times during the heating season. Experience will dictate the frequency.
•Radiant tubes, combustion air ducting, and exhaust venting should be inspected to make sure that: suspension points
are secure, tube clamp nuts are tight, heater is level, chains are plumb and taut (except for burner safety chain), vent
pipe joints are properly sealed, “S” hooks are crimped closed, there is no excessive exterior buildup of dust or dirt, and
make sure there are no restrictions such as bird or insect nests in the combustion air or vent piping or their
terminations.
•Reflectors should be inspected to make sure they are clean and secure, as detailed in the INSTALLATION section. If
dirty, reflectors should be removed and washed with isopropyl alcohol, Simple Green, or buffed with mild rubbing
compound.
•On U-tube systems, the U-bend reflector support nuts should be inspected to make sure they are tight.
•Inspect the inside of the blower housing for excessive dust or dirt buildup on the impeller wheel and make sure the air
orifice and the inlet air collar are properly attached. Check that the blower can come up to full speed.
•Remove the cover by removing the 4 sheet metal screws on top of the cover.
•Remove the ignitor by removing ONLY the end where the vinyl tubing is attached to the ignitor bracket; the fitting to
which the vinyl tubing was connected; the ignition lead wire from the ignition detection control; and the sheet metal
screw holding the ignitor bracket to the burner housing wall.
•Remove the ignitor carefully; its’ electrodes make a ninety degree turn to the right.
•Clean the ignitor’s porcelain insulation and check for cracks and proper gaps (see STARTUP section).
•Within the interior of the burner tube, examine the burner nozzle, primary air holes, main orifice and surrounding area
for build up of dust or dirt. Clean if necessary.
•Reinstall the ignitor by following the previous instructions in reverse order.
•Examine the ignition detection control for overheating (warped plastic housing, discoloration, etc.)
•A visual inspection of gas valve, airflow switch, and wiring is adequate.
•Inside each clear vinyl tube used for air flow sensing is a small snubber (aluminum cylinder piece). Visually inspect for
cleanliness.
•Clean any surfaces needed and correct any situations found in disrepair.
•Replace the cover and sheet metal screws.
•The blower motor is of the permanently lubricated type and requires no additional lubrication.
•Double check that the area under the heater is kept clear and free from combustible materials, gasoline, and other
flammable vapors and liquids.
•Reconnect electrical supply and cycle the heater several times using the thermostat allowing five (5) minutes between
cycles for proper operation.
•WARNING: Do not operate heater with any part bypassed, with any part failed or in any possible
situation that may compromise safety. Personal injury, death, and/or property damage could result.

17
TROUBLESHOOTING
•Check for symptoms and possible causes in the order presented from the top of this chart to the bottom.
•The symptoms and possible causes are in a logical progressive order as in a flow chart.
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
1. Heaters not isolated during high pressure leak
testing. 1. Replace combination gas valves on each heater.
2. All gas lines not completely bled of air. 2. Disconnect flex hose at each heater until gas is
present. Connect flex hose and leak test.
3. Gas supply regulator reversed. 3. Remove and install properly.
New installation.
4. Electrical supply line voltage & neutral polarity
reversed. 4. Correct electrical supply polarity.
Gas odor. 1. Gas pipe joints loose. 1. Check joints with soap solution, tighten as
needed.
1. Power supply fuse defective. 1. Replace fuse.
2. 115 VAC not reaching heater. 2. Check thermostat and wiring and fix.
Blower / PL-1 light does
not come on when
system energized. 3. Blower defective. 3. Replace blower.
1. Inlet or exhaust piping not the proper size and
length. (Refer to manual.) 1. Replace piping as required.
2. Inlet or exhaust termination fittings not to factory
specifications. 2. Replace fittings as required.
3. Inlet or exhaust blocked. 3. Clear blockage.
4. Airflow tubing or snubber orifice blocked in one
or both tubes. 4. Clear blockage.
5. Blower wheel dirty or damaged. 5. Clean or repair wheel.
Pressure switch does
not close / PL-2 light
does not come on.
6. Airflow pressure switch defective. 6. Replace airflow pressure switch.
1. 115 VAC not reaching the Ignition Detection
Control (IDC) due to loose wire or connector. 1. Repair loose wire or connector.
2. High-voltage wire loose or damaged. 2. Secure high-voltage wire or replace ignitor.
Ignitor does not spark /
PL-3 light does not
come on. 3. Ignition Detection Control (IDC) defective. 3. Replace IDC box.
1. Gas supply not turned on. 1. Open all manual gas supply valves.
2. Ignitor not sparking at the tips. 2. Measure spark gap and adjust gap as
necessary to 5/32" [0.156" (3.96mm)].
3. Ignitor not sparking at correct gap. 3. Replace ignitor.
4. Gas inlet pressure not correct. (See serial
plate). Gas inlet piping not sized correctly. 4. Replace inlet gas piping with correct size pipe.
5. Gas inlet pressure not correct. (See serial
plate). Gas supply regulator not set correctly. 5. Adjust gas supply regulator to set inlet pressure to proper level. (See serial plate).
6. Gas supply regulator sticking. 6. Replace gas supply regulator.
7. Combination gas valve not in the ON position. 7. Turn combination gas valve to the ON position.
8. Ignition Detection Control (IDC) not sending
115VAC to combination gas valve. 8. Replace IDC box.
9. Combination gas valve defective. 9. Replace combination gas valve.
10. Combination gas valve outlet (manifold)
pressure not correct. (See serial plate). 10. Adjust combination gas valve regulator to set inlet (manifold) pressure to proper level.
11. Main or sub gas orifice blocked by spider web,
etc. 11. Clear blockage.
Burner does not ignite.
(There are three trials-
for-ignition before the
IDC goes into lockout).
12. Gas orifice(s) or air orifice size not correct. 12. Install correct size gas orifice(s) or air orifice.
1. Power supply not grounded to a true earth
ground. 1. Install a true earth ground to the power supply.
2. Flame sensor wire loose or damaged. 2. Secure flame sensor wire or replace wire
harness to IDC box.
3. Flame signal not at least -17 VDC. 3. Check gas inlet and manifold pressures
compared to the possible causes in the previous
symptom where the burner does not ignite.
Spark does not stop
when the burner ignites.
4. Ignition Detection Control (IDC) is defective. 4. Replace IDC box.
1. Flame sensor wire is loose or damaged. 1. Replace wire harness to IDC box.
2. Ground connection to IDC loose. 2. Tighten ground connection to IDC.
3. Electrical supply line voltage & neutral polarity
reversed. 3. Correct electrical supply polarity.
4. Inlet or exhaust partially blocked. 4. Clear blockage.
5. Airflow pressure switch erratic or defective. 5. Consult factory or replace airflow pressure
switch.
6. Flame signal not at least -17 VDC. 6. Check gas inlet and manifold pressures
compared to the possible causes in the previous
symptom where the burner does not ignite.
Burner does not stay lit
until the thermostat is
satisfied.
7. Ignition Detection Control (IDC) defective. 7. Replace IDC box.
Heater will not turn off. 1. Thermostat defective. 1. Replace thermostat.

18
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19
REPLACEMENT PARTS
! WARNING !
Any substitutions of factory-installed parts without prior written permission may
result in unsafe operation, property damage, personal injury, death, voids CSA
design certification, and manufacturer’s warranty.
1. Gas valve 12. Safety chain bracket with nuts
2. Gas manifold assembly with fittings 13. Blower motor
3. Air flow switch (combustion) tubing assembly with
snubber and fittings 14. 36” (91cm) long power cord with 3-prong grounded plug
4. Burner core 15. Power cord strain relief bushing
5. Ignitor gasket 16. System validation light
6. Ignitor 17. Ignition detection control
7. Air flow switch (exhaust) tubing assembly with snubber
and fittings 18. Burner tube holding bracket with screws
8. Air flow switch 19. Wire harness assembly
9. Burner cover 20. Gas manifold fitting (at valve)
10. Inlet combustion air collar 21. Gas sub orifice
11. Air orifice plate 22. Gas main orifice (located inside of burner tube)
Due to continuous product improvement, please provide model number and serial number prior
to ordering replacement parts to assure safe repairs and maintenance.
10
13
11 12
16
14
15
17
4
1
18
20
2
5
6
7
3
19
22
21
9
8

20 U-TUBE INSTALLATION
•A heater may be installed in a U-Tube with its radiant tubes horizontal or with the heat
exchanger angled above the combustion chamber as illustrated by the drawings below.
•When radiant tubes are horizontal, reflectors (except at the U-bend) may be individually
rotated from 0 to 45 degrees. (NOTE: the U-bend reflector cannot be rotated.)
HORIZONTAL ANGLED
BASIC SUSPENSION ARRANGEMENT
U-BEND
REFLECTOR
(REQUIRED)
0
DEGREES 1 - 45
DEGREES
DO NOT
EXCEED
7.5 IN. (19cm)