Solaronics SSTG Guide

Form SST-IOM-14
900040
STAINLESS
SSTG/U
STAINLESS STEEL
GAS-FIRED LOW-INTENSITY INFRA-RED
RADIANT TUBE HEATERS
FOR EITHER INDOOR OR OUTDOOR INSTALLATION
INSTALLATION, OPERATION, &
MAINTENANCE INSTRUCTIONS
SSTG (Straight Tube) SSTU (U-Tube)
! WARNING !
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death.
Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this
equipment.
FOR YOUR SAFETY
•If you smell gas: open windows; don’t touch electrical switches, extinguish any open flames; evacuate the
structure; call your gas supplier immediately.
WARNING – NOT FOR RESIDENTIAL USE
•Failure to comply with instructions could result in unsafe operation, property damage, personal injury, and/or
death. A gas-fired appliance could 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. For
industrial or commercial use only.
•Retain these instructions for future reference. Contact factory for further information.
IMPORTANT
•Have a qualified electrician check the electrical supply circuit and wall receptacle are properly grounded and
the electrical supply polarity is correct. The heater control is polarity sensitive and will not operate properly if
the electrical supply is not wired correctly.
HAZARD INTENSITY LEVELS
•DANGER: Failure to comply will result in severe personal injury or death and property damage.
•WARNING: Failure to comply could result in severe personal injury or death and/or property damage.
•CAUTION: Failure to comply could result in minor personal injury and/or property damage.

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 these heaters 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.
•These heaters expand and contract with each
cycle. The installation of the gas connection
and mounting hardware must accommodate
this movement; otherwise, a fire or explosion
hazard may occur.
•These heaters are 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.
•These heaters 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 heaters cannot be used in the following environments: explosion-proof or residential
living/sleeping quarters.
•These heaters may or may not be used in the following environments: enclosed swimming pool,
process heating, or contaminated atmosphere applications.
•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 – safety precautions and important safety information 2
TABLE OF CONTENTS 3
GENERAL INFORMATION AND INSTALLATION CODES – certifications, local approvals,
installation codes and warnings, and gas/rating conversion 4
CANADIAN CODES – codes applicable to installations in Canada and variances from this
manual 5
CLEARANCE TO COMBUSTIBLES – minimum distances from heater to combustible materials 6
MOUNTING CONSIDERATIONS – minimum heater mounting heights, distances, angles and
spacing; and 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 and unvented (indoor venting) use and clearances 11
ELECTRICAL SUPPLY AND THERMOSTATIC CONTROL – electrical ratings, 120 and 24 VAC
thermostat arrangements and wiring diagrams 12
OPERATION AND SHUTDOWN – sequence of operation, shutdown, burner wiring diagrams 13
GAS SUPPLY AND GAS PRESSURE – gas supply 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 18
WINDY CONDITION NOTES – methods for suspending heater where windy conditions are
expected 19
U-TUBE INSTALLATION – horizontal or angled mounting of U-tube heaters 20
HEATER CONFIGURATIONS – possible arrangements of heat exchangers; reflector options 21
BASIC SYSTEM CONFIGURATIONS – straight and U-tube configurations with component
identification 23
COMBUSTION CHAMBERS – specifications of combustion chambers 24
HEAT EXCHANGERS – specifications of middle and exhaust end heat exchangers 25
INSTALLATION – preparation and instructions 26-27

4GENERAL INFORMATION AND INSTALLATION CODES
ATTENTION
Mount a copy of these instructions adjacent to heater
and retain a copy for future reference.
These heaters MUST be installed and serviced ONLY
by trained and qualified gas installation and service
personnel. The installing contractor must be familiar
with all the various requirements and is responsible for
installing each heater in compliance with these
instructions and all applicable codes of all authorities
having jurisdiction, local, state, provincial and national.
GENERAL INFORMATION
These heaters are CSA International Design Certified
and manufactured for either indoor or outdoor installation in
compliance with American National Standard for Gas-Fired
Low-Intensity Infrared Heaters ANSI Z83.20/CSA 2.34-latest
edition. An Outdoor Kit is required for outdoor use. If you
have any questions call factory before attempting
installation. These heaters are approved for commercial
and industrial installation only.
A limited number of excerpts from various standards
and codes are outlined in the following instructions.
UL LISTING
These heaters are design certified by CSA International
for compliance with ANSI Standard Z83.20-latest edition.
CSA International is the appropriate agency as they
specialize in gas appliances while Underwriters Laboratories
(UL) specialize in electric appliances. If UL were to design
certify the heaters, it would be to the same ANSI Standard.
Certification by UL is not required, as it would be redundant.
LOCAL APPROVALS
These heaters have local approvals by such governing
bodies as: New York City (A Series: MEA 232-95-E Vol. 2;
B and C Series MEA 417-86-E Vol. 5; MB Series MEA 233-
95-E Vol. 2; MC Series 233-95-E Vol. 2); City of
Minneapolis, Minnesota (#05444); the Commonwealth of
Massachusetts; and the State of Nebraska.
INSTALLATION CODES
All installations must be in accordance with local codes
and the National Fuel Gas Code, ANSI Z223.1 / NFPA 54-
latest edition. In locations used for the storage of
combustible materials, signs shall be posted to specify the
maximum permissible stacking height to maintain required
clearances from the heater to the combustibles. Where
unvented infrared heaters are used, natural or mechanical
means shall be provided to supply and exhaust [combustion
and ventilation air at a rate of] at least [4 CFM per 1000
BTUH] 4 ft
3
/min/1000 Btu/hr (0.38m
3
/min/kW) input of
installed heaters. Exhaust openings for removing flue
products shall be above the level of the heaters.
The heater, when installed, must be electrically grounded
in accordance with the National Electric Code, ANSI/NFPA
70-latest edition. All electrical work must conform to the
National Electrical Code ANSI / NFPA 70-latest edition. The
installation must meet the requirements of the Occupational
Safety and Health Act (OSHA) which requires OSHA
approved service and safety access to the systems after
they are installed.
AIRCRAFT HANGARS
These overhead heaters are suitable for use in aircraft
hangars when installed in accordance with the Standard on
Aircraft Hangars, ANSI / NFPA 409-latest edition, and are
so marked. In aircraft storage and service areas, heaters
shall be installed at least 3 m (10 ft) above the upper
surface of wings or of the engine enclosures of the highest
aircraft that might be housed in the hangar. The
measurement shall be made from the wing or engine
enclosure, whichever is higher from the floor, to the bottom
of the heater. In shops, offices, and other sections of
aircraft hangars communicating with aircraft storage or
servicing areas, the bottom of the heaters shall be installed
not less than 2.4 m (8 ft) above the floor. In all hangars,
suspended or elevated heaters shall be located in spaces
where they shall not be subject to injury by aircraft, cranes,
movable scaffolding, or other objects. Provisions shall be
made to ensure accessibility to suspended heaters for
recurrent maintenance purposes.
REPAIR GARAGES
These overhead heaters are suitable for use in repair
garages when installed in accordance with the Code for
Motor Fuel Dispensing Facilities and Repair Garages, NFPA
30A-latest edition (formerly the Standard for Repair
Garages NFPA 88B) and are so marked. Heat-producing
appliances using gas fuel listed for use in garages shall be
permitted to be installed in lubrication rooms, service rooms,
or fuel dispensing areas where Class I liquids are dispensed
or transferred, provided the equipment is installed at least
2.4 m (8 ft) above the floor.
! WARNING !
An overhead heater should be installed so that the
minimum clearances marked on the heater will be
maintained from vehicles parked below the heater.
(ANSI Z83.20, section 1.26.3.d.)
PARKING STRUCTURES
These overhead heaters are suitable for use in parking
structures when installed in accordance with the Standard
for Parking Structures, NFPA 88A-latest edition, and are so
marked. Unless otherwise permitted … all flames
associated with heating equipment shall be located a
minimum of 500 mm (18 in.) below the floor-ceiling
assembly or 500 mm (18 in.) above the floor.
MATERIAL SAFETY DATA SHEETS (MSDS)
These heaters comply with the US Superfund
Amendments and Reauthorization ACT (SARA) Title III. No
Material Safety Data Sheets are required.
GAS/RATING CONVERSION OF INSTALLED HEATER
Conversions of gas type and BTUH ratings are possible.
Identify model and serial numbers from the serial plate
located on the exterior of the burner. Identify the length of
radiant tubing. Review the BASIC SYSTEM
CONFIGURATIONS section to determine if system
components in addition to burner parts are needed to
convert the heater. Contact the factory for approved parts
and instructions.

5
CANADIAN CODES
•The information on this page applies specifically to installations in Canada.
INSTALLATION CODES
•These infrared heaters are CSA International Design Certified and manufactured for either indoor or outdoor installation
in compliance with the Standard for Gas-Fired Low-Intensity Infrared Heaters CSA 2.34-latest edition. If you have any
questions call factory before attempting installation. These heaters are certified for unvented or vented use.
•The installation must conform with local building codes or, in the absence of local codes, with the current Canadian
Natural Gas and Propane Installation Code, CAN/CSA B149.1. Canadian authorities having jurisdiction should be
consulted, before installations are made, to verify applicable local codes and installation procedures.
•An infrared heater shall be protected against physical damage.
•An unvented infrared heater shall not be installed in any location where a flammable vapour, combustible dust or fibres,
or an explosive mixture is present.
•An unvented infrared heater shall not be installed in a residential or care or detention occupancy building.
•An unvented infrared heater shall be provided with mechanical ventilation for combustion and ventilation air
(1) that is so located that products of combustion from each heater are effectively removed outdoors;
(2) that has a ventilation volume of at least [3 CFM per 1000 BTUH] 300 cfm (142 dm
3
/s) for each 100 000 Btuh
(30 kW) input or fraction there of; and
(3) is sufficient to maintain the level of carbon dioxide at less than 5000 ppm measured 6 ft (2m) above the work
area.
•An unvented heater shall have the ventilation system so interlocked that any reduction of the volume of airflow required
in the above note for a heater or group of heaters will cause the shutdown of that heater or group of heaters.
•An unvented infrared heater shall not be installed in an exit passageway or stairway within 8 ft (2.5 m) measured
horizontally from an exit door.
•An infrared heater shall be provided with clearance from combustible materials as certified and indicated on the heater.
•A vented infrared heater shall be installed in accordance with the certified markings and the manufacturer’s certified
installation instructions.
•A tube-type infrared heater shall only be connected with a Type I hose connector that is (1) certified as being in
compliance with CSA Standard CAN/CGA-8.1; and (2) of a length of 36 +/- 6 in (90 +/- 15 cm).
•If an external electrical source is utilized, the heater, when installed, must be electrically grounded in accordance with
the current Canadian Electric Code, CAN/CSA C22.1.
•The electrical connection shall comply with the local codes or, in the absence of local codes, with the current Canadian
Electrical Code, CAN/CSA C22.1, Part I and Part II, and Electrical Features of Fuel Burning Equipment, CAN/CSA
C22.2 No. 3.
•Vent terminal clearances shall be in accordance with the current Canadian Natural Gas and Propane Installation Code,
CAN/CSA B149.1. A horizontal vent shall not terminate less than 6 feet (1.8 m) from a combustion air inlet or another
appliance, 3 feet (900 mm) from any other building opening or any gas service regulator, or 7 feet (2.1 m) above grade
and shall not terminate directly above a gas utility meter or gas service regulator.
•Manual shut-off valves shall be used as specified in the current Canadian Natural Gas and Propane Installation Code,
CAN/CSA B149.1. 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 a pressure greater than its certified rating. A readily accessible manual shut-off valve shall be
installed to control the supply of gas to each appliance and the valve shall be located, in either the drop or riser, as
close as possible to the valve train of a commercial and industrial type appliance.
AIRCRAFT HANGARS
•These overhead heaters are suitable for use in aircraft hangars when installed in accordance with the current Canadian
Natural Gas and Propane Installation Code, CAN/CSA B149.1.
•A heater located in an aircraft storage or servicing area shall be installed so that no portion of an aircraft that can
occupy the area that is within the clearance to combustible material, as marked on the heater rating plate.
•When an infrared heater is installed in either a repair or shop area that communicates with an aircraft hangar, the
minimum clearance from the floor to the infrared heater shall be 8 ft (2.4m).
•An infrared heater shall not be located in an area of an aircraft hangar where it can be subjected to physical damage by
aircraft, cranes, movable scaffolding, or other objects.
GARAGES
•These overhead heaters are suitable for use in garages when installed in accordance with the current Canadian
Natural Gas and Propane Installation Code, CAN/CSA B149.1.
•The minimum clearance from the radiant face of the infrared heater to the upper surface of the highest vehicle shall not
be less than the certified clearance from combustible material as indicated on the heater [installed in a garage or a car
wash]. Provision shall be made to maintain these minimum specified clearances by an interlock that shuts off the gas
supply until the required clearances have been re-established, a protective bar, or a device that provides a warning
when the clearances are not being maintained.
•Where an infrared heater is installed in a garage and the clearance from combustible material cannot be maintained
when the vehicle is raised on a hoist, an electrical interlock shall be provided to shut off the burner and prevent its
operation until the required clearance has been re-established.
WARNING
•An overhead heater should be installed so that the minimum clearances marked on the heater will be
maintained from vehicles parked below the heater. (CSA 2.34, section 1.26.3.d.)

6
TOP
TOP
FRONT
BELOW REAR BELOW
FRONT
REAR
TOP
BELOW
FRONT
REAR
0° MOUNTING 1°-30° MOUNTING 31°-45° MOUNTING
CLEARANCE TO COMBUSTIBLES*
CLEARANCES FOR
ALL HEATERS*
inches (cm)
TOP OF REFLECTOR
12 (31)
END OF BURNER
12 (31)
END OF U-BEND
68 (173)
•Reflector width = 15.75” (40cm)
•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 (cm).
0° TO 30° REFLECTOR ANGLE 31° TO 45° REFLECTOR ANGLE
SERIES MBTUH (kW) FRONT REAR BELOW FRONT REAR BELOW
40 (12)
45 (13)
50 (15) 40 (102) 40 (102) 40 (102) 40 (102) 12 (31) 40 (102)
A55 (16)
60 (18) 50 (127) 50 (127) 50 (127) 50 (127) 12 (31) 50 (127)
MB
B
65 (19)
70 (21)
75 (22)
80 (23)
85 (25)
24 (61) 24 (61) 60 (152) na na na
B90 (26)
95 (28)
100 (29) 24 (61) 24 (61) 60 (152) na na na
B
MC
105 (31)
110 (32)
115 (34)
120 (35)
B / MC / C 125 (37)
32 (82) 32 (82) 72 (183) na na na
MC / C 130 (38)
135 (40)
140 (41)
145 (42)
150 (44)
48 (122) 48 (122) 82 (209) 70 (189) 12 (31) 82 (209)
155 (45)
160 (47)
165 (48)
170 (50)
175 (51)
58 (148) 58 (148) 92 (234) 80 (203) 12 (31) 92 (234)
C
180 (53)
185 (54)
190 (56)
195 (57)
200 (59)
68 (173) 68 (173) 102 (259) 90 (229) 12 (31) 102 (259)
•*MINIMUM CLEARANCES specified in these tables must be maintained to combustible and other materials which may
be damaged by temperatures 90°F above (50°C above) ambient room temperature. These clearances to combustibles
are specified on each heater’s serial plate. In locations used for the storage of combustible materials, signs must be
posted to specify the maximum permissible stacking height to maintain required clearances from the heater to the
combustibles. (ANSI Z223.1/NFPA 54) Gas and electrical supply lines shall not be located within the minimum
clearances to combustibles. na = not applicable.
•Carefully examine materials surrounding the heater. Materials, such as plastic, having low service temperature ratings
can be discolored or damaged. It is the installer’s responsibility to ensure that building materials with a low heat
tolerance, which may degrade at lower temperatures, are protected to prevent degradation.
•Fire sprinkler heads must be located at an appropriate distance from the heater. This distance may exceed the
published clearance to combustibles. Certain applications will require the use of high temperature sprinkler heads or
relocation of the heaters. Sprinkler systems containing propylene glycol or other flammable substances are not to be
used in conjunction with this heater without careful consideration for and avoidance of potential fire or explosion
hazards. For further information consult NFPA 13. Always observe applicable state and local codes.

7
MOUNTING CONSIDERATIONS
•Clearance to combustible materials must be maintained.
•Mounting heights lower than the recommended Minimum Height may be used if personnel are not
kept directly under heater.
•The Distance From Wall measurement provides the most effective heat dispersion balance
between the floors and walls.
•There is practically no limitation on a maximum mounting height, however, the higher the heater is
mounted the less radiant heat is felt at the floor directly below the heater.
•By design, a straight infrared radiant tube heater will produce more heat at the burner end than at
the exhaust end. Locate the burner end where more heat is desired.
Reflector: Standard Parabolic Standard &
Parabolic
Mounting
Angle: Horizontal 30º - 45º Horizontal 30º - 45º Horizontal 30º - 45º Horizontal 30º - 45º Horizontal & 30º - 45º
Input
MBTUH
(kW)
Minimum Height
feet
(m)
Distance From Wall
feet
(m)
Minimum Height
feet
(m)
Distance From Wall
feet
(m)
Max. Distance
Between Rows
feet
(m)
40
(12) 9.5
(2.9) 7.5 (2.3) 6 (1.8) 1 (0.3) 11.5 (3.5) 9.5 (2.9) 4 (1.2) 1 (0.3) 80 (24.4)
45-50
(13-15) 10.0
(3.0) 8.0 (2.4) 6 (1.8) 1 (0.3) 12.0 (3.7) 10.0 (3.0) 4 (1.2) 1 (0.3) 80 (24.4)
55-60
(16-18) 10.5
(3.2) 8.5 (2.6) 6 (1.8) 1 (0.3) 12.5 (3.8) 10.5 (3.2) 4 (1.2) 1 (0.3) 80 (24.4)
65-75
(19-22) 11.0
(3.4) 9.0 (2.7) 8 (2.4) 1 (0.3) 13.0 (4.0) 11.0 (3.4) 6 (1.8) 1 (0.3) 80 (24.4)
80-85
(23-25) 11.5
(3.5) 9.5 (2.9) 8 (2.4) 1 (0.3) 13.5 (4.1) 11.5 (3.5) 6 (1.8) 1 (0.3) 90 (27.4)
90-95
(26-28) 12.0
(3.7) 10.0 (3.0) 8 (2.4) 1 (0.3) 14.0 (4.3) 12.0 (3.7) 6 (1.8) 1 (0.3) 95 (29.0)
100-105
(29-31) 12.5
(3.8) 10.5 (3.2) 8 (2.4) 1 (0.3) 14.5 (4.4) 12.5 (3.8) 6 (1.8) 1 (0.3) 95 (29.0)
110-115
(32-34) 13.0
(4.1) 11.0 (3.4) 12 (3.7) 1 (0.3) 15.0 (4.6) 13.0 (4.1) 9 (2.7) 1 (0.3) 100 (30.5)
120
(35) 13.5
(4.1) 11.5 (3.5) 12 (3.7) 1 (0.3) 15.5 (4.7) 13.5 (4.1) 9 (2.7) 1 (0.3) 100 (30.5)
125
(37) 14.0
(4.3) 12.0 (3.7) 12 (3.7) 1 (0.3) 16.0 (4.9) 14.0 (4.3) 9 (2.7) 1 (0.3) 105 (32.0)
130
(38) 14.5
(4.4) 12.5 (3.8) 12 (3.7) 1 (0.3) 16.5 (5.0) 14.5 (4.4) 9 (2.7) 1 (0.3) 105 (32.0)
135-140
(40-41) 15.0
(4.6) 13.0 (4.0) 12 (3.7) 1 (0.3) 17.0 (5.2) 15.0 (4.6) 9 (2.7) 1 (0.3) 105 (32.0)
145
(42) 15.5
(4.7) 13.5 (4.1) 12 (3.7) 1 (0.3) 17.5 (5.3) 15.5 (4.7) 9 (2.7) 1 (0.3) 105 (32.0)
150
(44) 16.0
(4.9) 14.0 (4.3) 12 (3.7) 1 (0.3) 18.0 (5.5) 16.0 (4.9) 9 (2.7) 1 (0.3) 105 (32.0)
155-160
(45-47) 16.5
(5.0) 14.5 (4.4) 13 (4.0) 1 (0.3) 18.5 (5.6) 16.5 (5.0) 10 (3.0) 1 (0.3) 105 (32.0)
165-170
(48-50) 17.0
(5.2) 15.0 (4.6) 13 (4.0) 1 (0.3) 19.0 (5.8) 17.0 (5.2) 10 (3.0) 1 (0.3) 110 (33.5)
175-180
(51-53) 17.5
(5.3) 15.5 (4.7) 14 (4.3) 1 (0.3) 19.5 (5.9) 17.5 (5.3) 11 (3.4) 1 (0.3) 110 (33.5)
185-190
(54-56) 18.0
(5.5) 16.0 (4.9) 14 (4.3) 1 (0.3) 20.0 (6.1) 18.0 (5.5) 11 (3.4) 1 (0.3) 115 (35.1)
195-200
(57-59) 18.5
(5.6) 16.5 (5.0) 15 (4.6) 1 (0.3) 20.5 (6.2) 18.5 (5.6) 12 (3.7) 1 (0.3) 115 (35.1)
HIGH ALTITUDE
•High altitude is any altitude greater than 2000 feet (610 m) above sea level.
•These heaters are manufactured for use at the specific altitude range stated on the heater serial
plate. Do not install heater if it is not rated for the correct altitude. Contact factory if in doubt.

8OVERVIEW DRAWINGS (1 OF 2)
ROOF FLASHING
(NOT SUPPLIED)
"B" VENT
PIPE ADAPTOR
ROOF VENTING
CAP MUST BE
6" (15CM)
HIGHER THAN
SNOW DEPTH.
17"
(43CM)
4" B-VENT ADAPTOR
(PROVIDED BY OTHERS)
INLET AIR CAP
(OPTIONAL ACCESSORY)
4" (10.2 CM) VENT
PIPE ADAPTOR
ADDITIONAL COMBUSTION AIR SUPPLY
(NOT SUPPLIED)
SINGLE WALL 26 GAUGE (.044 CM) MINIMUM
GALVANIZED SHEET METAL PIPE OR SCHEDULE
40 PVC (SEAM MUST BE AT TOP)
REFLECTOR
INDEPENDENTLY ADJUSTABLE
HEAT EXCHANGER
4"(10.2CM) O.D. X 5'-0"(1.52M)
OR 10'-0"(3.05M) LONG
COMBUSTION CHAMBER
4"(10.2CM) O.D. X
10'-0"(3.05M) LONG
12" (30CM)
MIN.
10'-0"
(305M)
TYPICAL
BURNER
TUBE CLAMP
SUPPLY PIPING MUST NOT EXCEED AN EQUIVALENT OF
35 LINEAR FT. (10.7 M) FOR 40 TO 125 MBTUH (12-37 KW)
OR 40 LINEAR FT. (12.2 M) FOR 130 TO 200 MBTUH (38-
59KW). NO MORE THAN TWO 90° ELBOWS MAY BE USED.
A 90° ELBOW IS EQUIVALENT TO 10 LINEAR FT. (3.0 M).
INLET AIR SLEEVE
(SEAM TO BE AT TOP)
4" (10.2 CM) I.D. FLEX DUCT -
18" (46 CM) LONG WITH
(2) TWO HOSE CLAMPS
BLOWER
MOTOR
ENCLOSURE
ROOF FLASHING
(NOT SUPPLIED)
ROOF VENTING CAP
MUST BE 6" (15CM)
HIGHER THAN
SNOW DEPTH
USE A SAFETY CHAIN WITH ENOUGH SLACK AS INDICATED.
SAFETY CHAIN [MUST BE 1/0 TENSO AND HAVE A MINIMUM
WORKING LOAD RATING OF 200 LBS. (90.7 KG)] AND S-HOOK
[1/4" (.64 CM) STEEL WIRE DIA., 3/4" (1.91 CM) INSIDE HOOK
DIA., 350 LB. (158.8 KG) PULL TEST] TO BE PROVIDED BY
OTHERS.
DISTANCE FROM
SUSPENSION POINT
TO TOP OF COVER
PLUS 6"(15CM) =
LENGTH OF
SAFETY CHAIN
12"
(30CM)
MIN.
CLEARANCE
ALL HANGING CHAINS MUST BE PLUMB
AND VERTICAL IN ALL DIRECTIONS WHEN
INITIALLY INSTALLED

9
2'-0" (.610 M) MINIMUM CLEARANCE
ABOVE OR BEYOND THE HIGHEST
STRUCTURE OR SURFACE WITHIN
10'-0" (3.046 M) OF THE VENT
ADDITIONAL EXHAUST VENT PIPING (NOT SUPPLIED) 4" (10.2CM) I.D.
SINGLE WALL 26 GAUGE (.044 CM) MINIMUM GALVANIZED SHEET METAL PIPE
(SEAM TO BE AT TOP) (OR OTHER FACTORY-APPROVED MATERIALS)
VENT PIPING MUST NOT EXCEED AN EQUIVALENT OF 35 LINEAR FT.
(10.7 M) FOR 40 TO 125 MBTUH (12-37 KW) OR 40 LINEAR FT.
(12.2 M) FOR 130 TO 200 MBTUH (38-59 KW). NO MORE THAN
2 ELBOWS MAY BE USED. A 90° ELBOW IS EQUIVALENT TO 10 LINEAR
FT. (3.0 M). A 45° ELBOW IS EQUIVALENT TO 5 LINEAR FT. (1.5 M).
WALL BRACE
USE APPROPRIATE FASTENER (NOT SUPPLIED)
FOR ATTACHING TO BUILDING MATERIAL
(3) 90° BRACES
EQUALLY SPACED
4" (10.2 CM)
WALL VENTING KIT
ACCESSORY
ADD NON-COMBUSTIBLE SUPPORT (NOT SUPPLIED)
EVERY 5 OR 6 FEET (1.5 OR 1.8 M) APART AND
ADEQUATE FOR THE PIPING WEIGHT.
FOR COMBUSTIBLE WALLS ONLY
USE A 2" (5.1 CM) CLEARANCE NON-COMBUSTIBLE
VENTILATING METAL THIMBLE (NOT SUPPLIED)
FOR NON-COMBUSTIBLE WALLS ONLY
4.250" (10.8 CM) DIA. HOLE FOR 4" (10.2 CM)
O.D. PIPE ADD NON-COMBUSTIBLE PROTECTION
AROUND THE HOLE IF NECESSARY
MAINTAIN 18 INCH (46 CM) MINIMUM CLEARANCE TO
COMBUSTIBLES FOR ENTIRE LENGTH OF PIPING
FOR ALL INDOOR 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.
INTERNAL TUBE
CLAMP STOP
(NOT SHOWN)
4" (10.2 CM) VENT PIPE
ADAPTOR
(FACTORY ACCESSORY)
TIGHTEN NUTS A HALF TURN AT A TIME, IN A
2,3,4,1 SEQUENCE UNTIL THE FLANGES OF THE
CLAMP TOUCH AND 65 FT-LBS. (88 NM) IS
ACHIEVED AT EACH NUT TO ASSURE PROPER
SEATING OF THE CLAMPS INNER SLEEVE.
TUBE CLAMP
ALWAYS NEAREST
THE BURNER
HANGER
TUBE CLAMP
DO NOT PINCH THE HANGER
BETWEEN THE FLANGES!
HOOK OF HANGER
MUST BE CLOSED
1234
OPTIONAL COMMON VENTING
THROUGH ROOF OR WALL
BOTH HEATERS MUST BE CONTROLLED BY
A SINGLE THERMOSTAT
NEVER USE A STRAIGHT
THROUGH TEE
4" X 4" X 5" Y-COUPLER
[10.2 X 10.2 X 12.7 CM]
(OPTIONAL ACCESSORY)
4" (10.2 CM)
WALL VENT CAP
ALTERNATE
ACCESSORY
OVERVIEW DRAWINGS (2 OF 2)
CAUTION
•The first twenty (20) feet (6.1 m) of radiant tube extending from the burner
MUST be installed straight.
•There is one exception. A U-Tube heater may have a 180-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.

10
ROOF VENTING CAP USED FOR INLET AIR MUST BE
6 IN. (15 CM) HIGHER THAN SHOW 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)
COMBUSTION AIR SUPPLY
PIPING 4 IN. (10 CM) I.D.
(BY OTHERS) SUPPORT
AS NECESSARY
FLEX DUCT ACCESSORY
4 IN. (10 CM) I.D.
18 IN. (46 CM) LONG
INLET AIR WALL CAP
ACCESSORY REQUIRES
4" B-VENT ADAPTOR
(BY OTHERS)
INLET AIR SLEEVE ACCESSORY
(SEAM TO BE AT TOP)
INLET AIR
COLLAR
TWO HOSE CLAMPS
COMBUSTION AIR SUPPLY
GENERAL NOTES MAXIMUM LENGTH OF AIR SUPPLY PIPE
•Uncontaminated atmospheric air for
combustion may come from either outdoors or
indoors (from within the building).
•Installation of combustion air supply must
comply with the instructions, drawings, and
installation notes provided in this section.
OUTDOOR AIR SUPPLY
40 to 125 MBTUH (12 – 37 kW) 35 linear ft. (10.7 m)*
130 to 200 MBTUH (38 – 59 kW) 40 linear ft. (12.2 m)*
*Each 90 degree elbow inserted in the venting system
is equivalent to 10 linear ft. (3.0 m).
*Each 45 degree elbow inserted in the venting system
is equivalent to 5 linear ft. (1.5 m).
A maximum of two 90 degree elbows or their equivalent are allowed (e.g. one 90
degree elbow plus two 45 degree elbows; or four 45 degree elbows, etc.)
OUTDOOR AIR SUPPLY THRU-THE-ROOF
OUTDOOR AIR SUPPLY THRU-THE-WALL
•Uncontaminated atmospheric air for
combustion may come from either outdoors or
indoors (from within the building).
•Installation of combustion air supply must
comply with the instructions, drawings, and
installation notes provided in this section.
•In buildings contaminated with excessive dust
or dirt, or containing substances which when
combined with flame and exhaust products
result in corrosive gasses or those under a
negative pressure, or high humidity areas,
combustion air must come from outdoors.
•Outdoor air supply may be accomplished by
bringing in air through piping from either the
roof or wall as the drawings illustrate.
•When combustion air is supplied from outdoors,
the heater must also be vented to the outdoors
(EXCEPT high humidity environments consult
factory).
•The roof venting cap used for inlet air cap
(roof), inlet air wall cap or inlet air box (wall)
must be located at least three (3) feet (.91 m)
away from any vent termination and in a
manner to prevent blockage by snow.
•Components supplied by others must be
identical to those specified in this manual and
be Metalbestos brand, or equal, for the roof
vent cap; and Simpson Dura-Vent, or equal, for
the wall vent cap. NO SUBSTITUTIONS.
•Single wall 4” (10.2 cm) I.D., 26-gauge (.044
cm) minimum stainless or galvanized sheet
metal pipe or schedule 40 PVC is
recommended for combustion air supply piping.
•It may be desirable to insulate piping with 1
inch (2.54 cm) of pipe insulation to eliminate
condensation from warm inside air.
•DO NOT use collapsible material for
combustion air supply, as it will restrict the
proper amount of combustion air from being
supplied to the burner.
•An optional blower enclosure extends the
burner housing to enclose the blower. The
outdoor air piping is then attached to the
enclosure, isolating the outside of the blower
and motor from contaminants.
INDOOR AIR SUPPLY
•When combustion air is to be taken from inside
a tightly closed building, an opening to the
outdoors must be installed to supply the burner
with sufficient air for combustion.
•For every 4,000 BTUH (1.17 kW) input of the
total input of ALL gas-fired equipment, one (1)
square inch (6.45 cm2) or more of free area
opening must be provided.
•The openings should be located above the
heaters to reduce the effect of drafts.
•Do not draw combustion air into the heater from
attic space or another tightly closed room.
There is no guarantee adequate air will be
supplied

11
COMBUSTIBLE
OBJECTS MUST
NOT BE WITHIN
RADIUS OF CTC
INDOOR
VENTING KIT
CTC
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
(NOT SUPPLIED)
MAINTAIN 18 IN. (46 CM) MINIMUM
CLEARANCE TO COMBUSTIBLES
FOR ENTIRE LENGTH OF PIPING
ROOF FLASHING
(NOT SUPPLIED)
4 IN. (10 CM)
VENT PIPE
ADAPTOR
ROOF VENTING CAP
B VENT PIPE
ADAPTOR
(3) 90°
BRACES
EQUALLY
SPACED
EXHAUST VENTING
OUTDOOR EXHAUST VENTING MAXIMUM LENGTH OF EXHAUST VENT PIPE
40 to 125 MBTUH (12 – 37 kW) 35 linear ft. (10.7 m)*
130 to 200 MBTUH (38 – 59 kW) 40 linear ft. (12.2 m)*
*Each 90 degree elbow inserted in the venting system
is equivalent to 10 linear ft. (3.0 m).
*Each 45 degree elbow inserted in the venting system
is equivalent to 5 linear ft. (1.5 m).
A maximum of two 90 degree elbows or their equivalent are allowed (e.g. one 90
degree elbow plus two 45 degree elbows; or four 45 degree elbows, etc.)
DISTANCES OF OUTDOOR EXHAUST VENT FROM:
BELOW
Inches (cm) HORIZONTAL Inches (cm) ABOVE Inches (cm)
Door na 48 (122) na
Window 48 (122) 12 (30) na
Gravity Air Inlet na na 12 (30)
Forced Air Inlet
Within 10 ft. (3.0 m) na na 36 (91)
Grade na na 12 (30)
Gas & Electric Meters,
Regulators & Relief Valves na 48 (122) na
VENTING THROUGH THE ROOF OR WALL
•A heater operating with positive vent static
pressure and a vent gas temperature that avoids
excessive condensate production in the vent is
classified as a Category III Vented Appliance.
•This heater may be vented through the roof or wall
singularly or in conjunction with no more than one
other heater with a single thermostat. To vent
more than two heaters together consult the factory.
•Use 4-in. (10.2 cm) I.D. single wall stainless or
galvanized sheet metal pipe of not less than 26 ga.
(.044 cm) thickness (or other factory approved
materials). Place pipe seam at the top.
•Use RTV silicone adhesive sealant liberally at all
vent pipe joints.
•Use three (3) #6 sheet metal screws per vent pipe
joint – 120° apart starting at the top.
•Recommend 1-inch (2.5 cm) thick pipe insulation
wrapped around single wall sheet metal vent pipe.
•By code, the use of dual wall pipe for outdoor
venting is limited to appliances with neutral or
negative pressures. Local authorities may waive
this provision since the heaters are approved for
indoor venting with proper exhaust and leakage
due to condensation being greatly reduced.
•Be certain to get approval for either type of vent
piping from local authorities.
•Vent pipes must be well supported due to the extra
stress that occurs during expansion of the unit
when operating.
•Vent caps must be identical to, or equal to, the
Metalbestos brand for roof venting or Simpson
Dura-Vent brand for wall venting. This is critical to
the heater’s operation and to maintain CSA
certification. NO SUBSTITUTIONS.
•Do not vent heater between buildings less than 10
feet (3.0 m) apart or above public walkways, doors
or windows.
IMPORTANT
•Systems with clamped tubes suspended by clamps
may use an optional steel Vent Pipe Connector to
avoid crushing sheet metal venting material. •Do not install exhaust vent cap under eaves.
UNVENTED (INDOOR VENTING) UNVENTED (INDOOR VENTING) CLEARANCES
•Where unvented infrared heaters are used, natural
or mechanical means shall be provided to supply
and exhaust at least [4 CFM per 1,000 BTUH]
4 ft3/min/1000 Btu/hr (.38 m
3 /min/kW) input of
installed heaters. (ANSI 2223.1/NFPA 54.)
•In Canada see CANADIAN CODES section.
•Exhaust openings for removing flue products shall
be above the level of the heaters.
•Where all combustion air is provided by a
mechanical air supply system, the combustion air
shall be supplied from outdoors at the minimum
rate of 0.35 ft3/min per 100 Btu/hr (0.034 m3/min
per kW) for all appliances located within the space.
•Where exhaust fans are installed, additional air
shall be provided to replace the exhausted air.
•Each appliance served shall be interlocked to the
mechanical air supply system to prevent main
burner operation where the mechanical air supply
system is not in operation.
•Combustion air must not be provided directly from
outdoors to the burner. For exceptions see
COMBUSTION AIR SUPPLY section.
•CLEARANCE TO COMBUSTIBLES (CTC) must be
maintained from exhaust end of heater.
RATING
MBTUH (kW) CTC*
40 to 60 (12 - 18) 10” (25 cm)
65 to 100 (19 - 29) 30” (76 cm)
105 to 125 (31 - 37) 38” (97 cm)
130 to 150 (38 - 44) 48” (122 cm)
155 to 175 (45 - 51) 58” (147 cm)
180 to 200 (53 - 59) 68” (173 cm)
*CTC is measured from
the end of the Indoor Venting Kit.
•Minimum clearance from ceiling: 15” (38 cm) is measured
from top of reflector.

12
WIRING BY
PURCHASER
GREEN (GROUND)
WHITE (NEUTRAL)
FUSED
DISCONNECT
THERMOSTAT
DUAL SYSTEM ONLY
BLACK
(LINE)
TO
BURNER
TO
BURNER
120-1-60
120-1-60 (3 WIRE SERVICE)
(NEUTRAL)
WHITE
TO BURNER
TRANSFORMER/RELAY
(MOUNTED TO 4x4
JUNCTION BOX
PROVIDED BY OTHERS)
FUSED DISCONNECT
(BY OTHERS)
WIRE NUT SYMBOL
WIRING BY OTHERS GREEN GROUND
SCREW IN 4X4
JUNCTION BOX
WIRE NUT
(BY OTHERS)
NEUTRAL
(HOT)
BLACK
(GROUND)
GREEN
BLACK
BLACK
WHITE
RED
BROWN
HOT
GROUND
R
C
W
Y
G
24 VOLT
THERMOSTAT
BURNER 1 BURNER 2 BURNER 6 BURNER 7
T'STAT
FUSED
120V.
1PH.
HOT
NEUTRAL
GROUND
NOTE: SEE TABLE FOR MAXIMUM NUMBER OF
HEATERS ON A THERMOSTAT
W
Y
R
G
C
TRANSFORMER/RELAY
CAUTION: NO MORE THAN THREE
HEATERS IN A SERIES
NOTE: BROWN WIRE IS NOT USED BUT MAY BE ELECTRICALLY HOT.
PROTECT PERSONNEL AND THE CIRCUIT BY SCREWING ON A WIRE NUT
BROWN
WIRE NUT
BY OTHERS
WIRING BY
OTHERS
GREEN
BLACK
WHITE
GROUND
NEUTRAL
WHITE
BLACK
BLACK RED
FUSED
DISCONNECT
(BY OTHERS)
GREEN GROUND SCREW
IN 4X4 JUNCTION BOX
BLACK
BLACK
HOT
BURNER 1 BURNER 3
LO-VOLT
T-STAT
ELECTRICAL SUPPLY AND THERMOSTATIC CONTROL
ELECTRICAL SUPPLY 120 VAC THERMOSTATIC CONTROL
HEATERS IN SERIES WITH A 120 VAC THERMOSTAT
•Voltage: 120 VAC – 1 phase – 60 Hz.
•Maximum Amps: 3.0 (1.33 actual full load
amps).
•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.
•Have a qualified electrician check that the
electrical supply circuit and wall receptacle are
properly grounded and that the electrical
supply polarity is correct. The heater control is
polarity sensitive and will not operate properly
if the electrical supply is not wired correctly.
•Electrical power takeoff must be connected to
a separately fused circuit with a disconnect,
and must be properly polarized and grounded
to the heaters power cord.
•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).
GENERAL INSTALLATION NOTES
24 VAC THERMOSTAT AND TRANSFORMER (MAX. 3 HEATERS)
•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 four to five feet above the
floor where it will not be directly affected by the
heat from the heater, outside drafts, or the
sun.
•A location that best represents the average
temperature of the room is the most desirable.
•If two heaters are installed on a common
exhaust vent they must be controlled by the
same thermostat.
CAUTION – 24VAC THERMOSTAT
DO NOT try to connect more than three burners to
a 24 VAC thermostat. The transformer relay is
rated to operate only three heaters safely. Failure
to do so may cause serious bodily harm or property
damage.
ACCESSORY THERMOSTATS HEATERS IN SERIES WITH A 24 VAC THERMOSTAT
Thermostat Volts
AC Amps Maximum
Number of
Heaters
132026-4 120 22.0 7
132486 120 16.0 5
132700 24 .15-1.0 3*
* When installing these heaters to any thermostat,
the installer should allow for 3 amps per heater as
the blower tends to use more electricity than its
rating during its start-up period. This is why all of
the 24 VAC thermostats must be connected to a
120 VAC transformer relay, which will safely
support only three heaters. Note: The brown wire is not used, but may be electrically hot. Protect
personnel and the circuit by screwing on a wire nut.

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:
Gas Type Input MBTUH
(kW)
MINIMUM
Inlet Pressure
inches WC
(cm WC)
MAXIMUM
Inlet Pressure
inches WC
(cm WC)
40 to 125
(12 to 37) 6(15) 14(35)
Natural 130 to 200
(38 to 59) 7(18) 14(35)
•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. LP/Propane All 11(28) 14(35)
WARNING IMPORTANT
•Connector must be installed in a “ ” configuration. Use only
the 24” (61cm) or 36” (91cm) 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.
•It is important to maintain dimensions on drawing below.
•Inlet gas pressure at inlet test point (IP) cannot be more than
14 inches of Water Column (WC) (35 cm WC) confirmed by
actual field test. (Heater on or off.)
•14 in. WC ≅½ PSI ≅35 cm WC ≅35 mbar ≅3.5 kPa.
HEATER EXPANSION AND GAS CONNECTOR LENGTH HIGH INLET PRESSURE
Heaters below require flexible
gas connectors of length:
24” (61cm) or 36” (91cm).
Heaters below require flexible
gas connectors of length:
36” (91cm).
Heater Length Expansion Heater Length Expansion
10-20 ft
(3.1-6.1 m) 1.1 in (28 mm) 45-50 ft (13.7-15.2 m) 2.1 in (53 mm)
25-30 ft
(7.6-9.1 m) 1.5 in (38 mm) 55-60 ft (16.8-18.3 m) 2.4 in (61 mm)
35-40 ft
(10.7-12.2 m) 1.8 in (46 mm) 65-70 ft (19.9-21.3) 2.7 in (67 mm)
•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.
GAS PRESSURE MEASUREMENTS MANIFOLD GAS PRESSURE
•Set inlet pressure first. Fluctuations in inlet pressure can alter manifold pressure.
•See drawing below for manifold pressure adjustment locations.
•Loosen set screw, or remove plug from 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. Screw may require a flat head screwdriver or a 3/32” (2.38mm) hex key.
Input: MBTUH (kW) Manifold Pressure
40 to 100 (12 to 29) 3.5 in. WC (8.9 cm WC) Nat./LP
•Use only water or red oil manometer
to make measurements – NOT A
DIAL GAUGE.
•Make ALL measurements and
adjustments when this heater and
ALL other gas burning equipment
connected to the same gas meter are
operating at maximum capacity. 105 to 200 (31 to 59) 5.0 in. WC (12.7 cm WC) Nat./LP
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
3
45
6
7
8
9
17
18
19
20
1
16
14
15
11 12
13
2
21
10
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 flare nuts 13. Blower motor
3. Air flow switch (combustion) tubing assembly with
snubber and fittings 14. Strain relief bushing
4. Burner core 15. System validation light
5. Ignitor gasket 16. Ignition detection control (IDC)
6. Ignitor 17. Burner tube holding bracket with screws
7. Air flow switch (exhaust) tubing assembly with snubber
and fittings 18. Wire harness assembly
8. Air flow switch 19. Gas manifold fitting (at valve)
9. Burner cover 20. Gas sub orifice
10. Blower motor enclosure 21. Gas main orifice (located inside of burner tube)
11. Air orifice plate
Due to continuous product improvement, please provide serial and model number prior to
ordering replacement parts to assure safe repairs and maintenance.

19
WINDY CONDITION NOTES
24'' (61 CM)
MIN.
'U'-TUBE
SECOND CHAIN
CONFIGURATION
X
2X
24'' (61 CM)
MIN.
X
2X
2X
STRAIGHT OR 'L' TYPE
SECOND CHAIN
CONFIGURATION
24'' (61 CM)
MIN.
X
BRACKET END VIEW
NEAR LOADING DOCK, AIRPLANE HANGAR DOORS,
OR OTHER WINDY AREAS FASTEN THE REFLECTORS
TO THE REFLECTOR SUPPORT BRACKETS WITH
TEK SCREWS OR OTHER POSITIVE MEANS.
BRACKET TEK
SCREW
REFLECTOR
BRACKET
REFLECTOR
BURNER
SECOND CHAIN
CONFIGURATION
12''
(30 CM)
MIN.
X
12''
(30 CM)
MIN.
2X
NO LESS THAN 20 FT. (6.1 M)
EXCEPT 10 FT. (3.0 M) AND
15 FT. (4.6 M) MODELS
STRAIGHT OR 'L'
TYPE CONFIGURATION
ELBOW
'U' TUBE
CONFIGURATION

20
DO NOT EXCEED
7.5 IN. (19 CM)
U-BEND REFLECTOR
(OPTIONAL)
U-BEND REFLECTOR
(OPTIONAL)
BURNER
U-TUBE INSTALLATION
•A heater may be installed as a U-Tube with its radiant tubes horizontal or with the heat exchanger
angled above the combustion chamber as illustrated by the drawing below.
•When radiant tubes are horizontal, reflectors may be individually rotated from 0 to 30 degrees or
from 0 to 45 degrees depending on the model installed. (Refer to CLEARANCE TO
COMBUSTIBLES section).
HORIZONTAL
ANGLED