SunSpan SRHS-40-10AN Owner's manual

Form SRH-IOM-1
500011
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 theSunSpan factory at 1-866-664-3824.
Monday –Friday 8 a.m. to 5 p.m. Eastern Time
Copyright © 2005, SunSpan

SRH pg. 2 WARNINGS
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 low-intensity heaters include a
turbulator, which must be located in the last
ten (10) feet (3.0 m) of the burner tube
[exception: 15-foot (4.6 m) units have the
turbulator in the first10 feet (3.0 m).]
•
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 gas installation and service
personnel.
IMPORTANT
Failure to follow these instructions may result in injury or property damage.
RH Residential 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.

SRH pg. 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 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 objects 6
MOUNTING CONSIDERATIONS – minimum heater mounting heights, high altitude considerations 7
OVERVIEW DRAWINGS – overview of venting, suspension, location, and typical installation 8-9
BASIC SYSTEM CONFIGURATIONS – straight and U-tube configurations with component identification 10
COMBUSTION CHAMBERS/HEAT EXCHANGERS – components and specifications 11
COMBUSTION AIR SUPPLY– application, construction, dimensions, and illustrations 12
EXHAUST VENTING– application, construction, dimensions, and illustrations 13
U-TUBE INSTALLATION– suspension and orientation of U-tube heaters 14
U-BEND REFLECTOR INSTALLATION– exploded view and instructions 15
TUBE ASSEMBLY TIPS – helpful tips to assemble tubes 16-17
INSTALLATION– preparation and installation 18-19
ELECTRICAL SUPPLY AND THERMOSTATIC CONTROL – electrical ratings, schematics, 24 and 120 VAC
thermostat arrangements, illustrations 20-21
GAS SUPPLY AND GAS PRESSURE – gas piping, inlet and manifold pressures 22
STARTUP – procedures 23
BURNER TROUBLESHOOTING– flowchart 24-25
MAINTENANCE– basic procedures 26
REPLACEMENT PARTS – exploded view and part descriptions 27
All rights reserved. No part of this work covered by the copyrights herein may be reproduced or copied by any means:
graphic, electronic or mechanical, including photocopying, recording, taping, information storage and retrieval systems
without written permission.

SRH pg. 4 INSTALLATION 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.

SRH pg. 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.

SRH pg. 6
REAR
FRONT
BELOW
TOP
REFLECTOR WIDTH =
15.75" (40 cm)
TOP
BELOW
REARFRONT
REAR
FRONT
BELOW
TOP
CLEARANCE 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 section 9.18.2(3) of the National Fuel Gas Code, “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.”
4CHILDREN 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.
5CLOTHING 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.
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).
DIAGRAMS NOT DRAWN TO SCALE
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
SERIES MBTUH (kW) FRONT REAR BELOW
40 (11.7)
45 (13.2)
50 (14.6) 24 (61) 24 (61) 40 (102)
SRH 55 (16.1)
60 (17.6) 24 (61) 24 (61) 50 (127)
MINIMUM MOUNTING HEIGHT: Bottom of tube to floor: 8 ft. (2.4 m) U.S.A., 7 ft. (2.1 m) Canada

SRH pg. 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 notbe 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.

SRH pg. 8 OVERVIEW DRAWINGS (1 OF 2)
"B" VENT PIPE ADAPTOR
OPTIONAL INLET
AIR SLEEVE (SEAM
TO BE ON TOP)
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.
(10.2cm) O.D. X 5 OR 10 FT.
(1.5m OR 3.0m) LONG
REFLECTOR
INDEPENDENTLY ADJUSTABLE
COMBUSTION CHAMBER
4 IN. (10.2cm) O.D. X 10 FT. (3m) LONG
ADDITIONAL COMBUSTION AIR SUPPLY
SINGLE WALL 26 GA. (.044cm) MINIMUM
GALVANIZED SHEET METAL PIPE OR
SCHEDULE 40 PVC (SEAM TO BE AT TOP)
(NOT SUPPLIED)
INLET AIR BOX
(NOT SUPPLIED)
INLET AIR SLEEVE
(SEAM TO BE ON TOP)
4 IN. (10.2cm) 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).
GAS CONNECTION DIAGRAM
LOCAL CODES MAY REQUIRE AN ADDITIONAL
SHUT-OFF COCK BE INSTALLED IN THE
GAS LINE AHEAD OF THE DRIP LEG
NOTE:
WHEN GAS PRESSURE EXCEEDS
14" (35cm) W.C., A FIRST STAGE
REGULATOR MUST BE INSTALLED.
1/2" (1.27cm) O.D. FLEXIBLE GAS CONNECTOR
24" (61cm) LONG STAINLESS STEEL
GAS COCK
(SUPPLIED BY OTHERS)
DRIP LEG
12"(30cm) MIN.
CLEARANCE
5"
(13cm)
15"
(38cm)
6.5"
(17cm) 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
29 IN.
(74cm)
FIRST TUBE SUSPENSION POINT SHOULD BE
(18) IN. (46cm) FROM THE BURNER BOX
VENT CAP MUST BE
6" (15cm) HIGHER
THAN SNOW DEPTH

SRH pg. 9
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
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" (10.2cm) MAX.
4"(10.2cm)
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" (5.1cm) CLEARANCE
NON-COMBUSTIBLE VENTILATING
METAL THIMBLE (NOT SUPPLIED) .
FOR NON-COMBUSTIBLE WALLS
ONLY 4.25" (10.8cm) DIA. HOLE
FOR 4" (10.2cm) 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
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)
ADDITIONAL EXHAUST VENT PIPING 4" (10.2cm) I.D.
SINGLE WALL 26 GA. (.044cm) MINIMUM 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 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.
•The heater must be controlled by a thermostat, timer or other
automatically operated device.

SRH pg. 10
BURNER GQC9
GQH6EXHAUST END
U-BEND
U-BEND
REFLECTOR
BASIC SYSTEM CONFIGURATIONS
MODEL NO. STRAIGHT TUBE HEATERS
SRHS-40-10AN
SRHS-40-10AL
SRHS-40-15AN
SRHS-40-15AL
SRHS-40-20AN
SRHS-40-20AL
SRHS-45-20AN
SRHS-45-20AL
SRHS-50-20AN
SRHS-50-20AL
SRHS-55-20AN
SRHS-55-20AL
SRHS-60-20AN
SRHS-60-20AL
MODEL NO. U-TUBE HEATERS
SRHU-40-15AN
SRHU-40-15AL
SRHU-40-20AN
SRHU-40-20AL
SRHU-45-20AN
SRHU-45-20AL
SRHU-50-20AN
SRHU-50-20AL
SRHU-55-20AN
SRHU-55-20AL
SRHU-60-20AN
SRHU-60-20AL
BURNER
EXHAUST END
GQC9
GQH6
BURNER GQC9
EXHAUST END
BURNER GQC1 GQH1
EXHAUST END
BURNER GQC1
GQH1EXHAUST END
U-BEND
U-BEND
REFLECTOR

SRH pg. 11
BURNER END
(STENCILED ON TUBE)
BURNER END
(STENCILED ON TUBE)
EXHAUST END
(STENCILED ON TUBE)
TURBULATOR
(FACTORY
INSTALLED)
WHITE TAPE
EXHAUST END
(STENCILED ON TUBE)
TURBULATOR
(FACTORY
INSTALLED)
COMBUSTION CHAMBERS/HEAT EXCHANGERS
COMBUSTION CHAMBER COMPONENTS
GQC1 40,000 thru 60,000 BTUH
(20 foot unit only)
[11.7-17.6kW (6.1m only)] GQC9 40,000 BTUH
(10 and 15 foot units only)
[11.7 kW (3 and 4.6m only)]
•14 ga. (.21cm) aluminized
titanium alloy steel tube
•10 ft. (3m) aluminum
reflector
•(2) hanger brackets
•14 ga. (.21cm) aluminized
titanium alloy steel tube
with turbulator
•10 ft. (3m) aluminum
reflector
•(2) hanger brackets
HEAT EXCHANGER COMPONENTS
GQH1 40,000 thru 60,000 BTUH
(20 foot unit only)
[11.7-17.6kW (6.1m only)] GQH6 40,000 BTUH
(15 foot unit only)
[11.7 kW (3 and 4.6m only)]
•16ga. (.17cm) aluminized
steel tube with turbulator
•10 ft. (3m) aluminum
reflector
•(2) hanger brackets
•5 ft. (1.5m) 16 ga. (.17cm)
aluminized steel tube
•5 ft. (1.5m) aluminum
reflector
•(2) hanger brackets
10 foot (3m) reflector Hanger bracket
[length approximately 119” (302cm)] (Front view)

SRH pg. 12
INLET AIR BOX
FRONT PANEL
OF INLET
AIR BOX
STUB
ADDITIONAL 4 IN. (10.2 CM) I.D.
COMBUSTION AIR SUPPLY
PIPING (NOT INCLUDED)
4 IN. (10.2 CM) I.D. FLEX DUCT
18 IN. (46 CM) LONG
SUPPORT
PIPING AS
NECESSARY
INLET AIR SLEEVE
(SEAM TO BE AT TOP)
OPTIONAL INLET
AIR SLEEVE
(SEAM TO BE AT TOP)
TWO HOSE CLAMPS
INLET AIR
COLLAR (COMES
WITH BURNER)
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
•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” (10.2cm) I.D. galvanized pipe of 20 gauge
(.035” or 0.9mm) or schedule 40 PVC is recommended
for combustion air supply piping.
•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.
•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 NOTuse 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
(30.5cm) higher than the inlet air roof venting cap.
THRU-THE-WALL THRU-THE-ROOF

SRH pg. 13
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
•Exhaust venting may be accomplished by passing flue products
through piping in the roof or wall as shown below.
•An 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 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” (10.2cm) I.D. galvanized metal pipe of 26
gauge (.018” or 0.46mm) 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.
•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.
•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” (5.1cm) 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)
Gas Meters &
Electric Meters,
Regulators &
Relief Valves
N/A 48 (122) N/A

SRH pg. 14 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)

SRH pg. 15
U-BEND REFLECTOR INSTALLATION
WARNING NEVER operate the U-tube heater WITHOUT the U-bend reflector
assembly installed. Unsafe operation, property damage, personal
injury, and/or death could result!
INSTRUCTIONS
1. Slide pipe hangers (Item no. 6) over U-bend (Item no. 2).
2. Install Items no. 4, 5, and 6 onto the pipe hanger’s stud.
3. Place U-bend reflector assembly (Item no. 1) over studs.
4. Install Items no. 4, 5, and 6 over the stud on top.
5. Position U-bend with reflector assembly into combustion chamber and heat exchanger up
to the colored indicators.
6. Use (4) four #12 multi-metal self-drilling screws (supplied with U-bend) to fasten U-bend
to combustion chamber and heat exchanger.

SRH pg. 16 TUBE ASSEMBLY TIPS (1 OF 2)
Experienced installers have made recommendations to
simplify the installation of these tubes by reducing the
number of connections to be made up in the air
Most important:
•Do not drag the tubes and dent the connecting ends!
•ALIGN THE WELD SEAMS OF ALL THE TUBES and make
sure they are on top when joining tubes!
#1 Place two (2) ten (10) foot (3m) sections on the floor and align
the weld seams on top. (Properly orient the “BURNER
END”/”EXHAUST END” markings on the combustion and exhaust
end tubes).
#2 Position a 2X4 in. (5x10 cm) block of wood on each of the far
ends of both tubes.
•One block of wood prevents damage to the connecting end that
will be used to tap that tube into the other.
•The other block of wood prevents damage to the other
connecting end that is butted up to a nearby sturdy wall.
ALL WELD SEAMS
MUST BE LINED UP
TOGETHER
COLOR INSERTION INDICATOR
SWAGED END PILOT HOLE
FLARED END
AIR FLOW
COLOR INSERTION INDICATOR
SWAGED END
FLARED END
PILOT HOLE
WOOD BLOCK
2X4 IN. (5X10 CM) WOOD BLOCK
2X4 IN. (5X10 CM)
ALIGN ALL THE WELD SEAMS IN A LINE TOGETHER!
STURDY WALL
WELD
SEAM WELD
SEAM

SRH pg. 17
TUBE ASSEMBLY TIPS (2 OF 2)
#3 Manually slide the male end of one tube into the female end of
the other tube. ALIGN THE WELD SEAMS ON BOTH TUBES
TOGETHER. STRAIGHTEN the two (2) tubes and proceed to tap
one tube into the other by hitting the wooden 2X4 in. (5x10 cm)
block, NOT the tube! Continue to tap one tube into the other until
the flared end comes up to, but does not cover the color insertion
indicator.
#4 STRAIGHTEN the tubes again BEFORE driving the
screws. Ensure all tubes are straight and level with the weld
seam on top before installing the screws. Drive with a power tool
the two (2) #12 MULTI-METAL Tek screws into the joint and
position the four (4) hangers on the twenty (20) foot (6.1m)
section.
#5 Attach a temporary rope or chain to the two (2) outer brackets
and hoist the twenty (20) foot (6.1m) section into the air. Align the
weld seam on top, level the section, and install the chain on the
hangers.
Complete the total installation according to this manual. Use these
tips along with the instructions in the INSTALLATION section. Use
the U-TUBE INSTALLATION and the U-BEND REFLECTOR
INSTALLATION sections as necessary.
RIGHT - STRAIGHT
WRONG - NOT STRAIGHT
STRAIGHTEN BEFORE DRIVING SCREWS

SRH pg. 18
BURNER END
(STENCILED ON TUBE)
INSTALLATION (1 OF 2)
CAUTION
•DO NOTuse gas piping or electrical conduit to provide any type of support for the heater’s suspension.
•Means of suspension MUST BE able to support twice the weight of the heater, securely fastened to the building’s
structure, and allow for expansion during its operation.
•Chain for suspensionMUST BE 12 in. (31cm) minimum in length and be 1/0 TENSO with a minimum working load rating
of 200 lbs. (90.7 kg).
•The “S” hook MUST BEChicago Hardware no. 5 or equal and carry a 70 pound (32kg) maximum load.
STEP
1•Use a taut string in the planning of suspension points to maintain straightness over the length of the system.
Make true right angles if elbows are used.
•Check the BASIC SYSTEM CONFIGURATIONS section for the general orientation of components matching
the model number of your system.
•Identify all components in the COMBUSTION CHAMBERS and HEAT EXCHANGERS sections.
•U-type systems use a 180-degree U-bend. See U-TUBE INSTALLATION section.
STEP
2•Install chain for suspension of tubes and reflectors.
•The suspension points for each 10-foot (3.0m) tube should be a
minimum of 4 feet (1.2m) and a maximum of 6 feet (1.8m) apart.
•Use a minimum of 12 in. (31cm) of chain for each suspension point.
•Install a chain to be positioned at the joint between the combustion
chamber and the burner.
•Install an additional suspension point, for a required safety chain at
the back of the burner box 17.5 in. (44cm) from the joint between the
combustion chamber and the burner.
•Install tube/reflector hangers. Slip one end of the S-hook through
the last chain link and the other end through the tube/reflector
hanger.
•IMPORTANT: Crimp both ends of the S-hook closed!
STEP
3•Identify all components in COMBUSTION CHAMBERS
and HEAT EXCHANGERS sections of this manual.
•Check the BASIC SYSTEM CONFIGURATIONS section
of this manual for the general orientation of components
matching the model number of your system.
•Systems fifteen (15) feet (4.6m) or longer require joining
together of combustion chamber and heat exchanger
tube(s). See TUBE ASSEMBLY TIPS section.
•For U-type systems, a 180-degree u-bend is also used.
See U-TUBE INSTALLATION section.
•Slip the burner coupling over the end of the combustion
chamber marked “BURNER END”.
•Rotate the burner coupling until the two holes on one end
of the coupling are each 90 degrees apart from the weld
seam on the combustion chamber and seat it against the
center stop.
•Use (2) #12 MULTI-METAL Tek screws (supplied with the
coupling) to fasten the coupling to the combustion
chamber.
•Tubes MUST NOT be dragged along the ground or other
surfaces which may damage the ends.
STEP
4•Take this assembly, with the weld seam still facing up, and place the end marked “BURNER END” into the
first two suspended hanger bracket assemblies at the point where the burner will eventually be located.
•Place a reflector (gloves are suggested; handle the reflectors with care as not to soil the shiny underside) over
the combustion chamber and into the suspended hanger bracket assemblies.
WARNING
•Heaters shall NOT be installed in living/sleeping areas.
BURNER
COUPLER
COMBUSTIONCHAMBER
MARKED "BURNER END"
#12 TEK SCREWS
(2 PLACES)
WELD
SEAM
WELD
SEAM

SRH pg. 19
COLOR INSERTION INDICATOR
SWAGED END PILOT HOLE
FLAREDEND
AIR FLOW
#12 MULTI-METAL SELF
DRILLING SCREWS (4 EA.)
BURNER
COUPLER
BURNER
BURNER
SUPPORT
CHAIN
INSTALLATION (2 OF 2)
STEP
5•The next heat exchanger tube, with it’s weld seam up, [for 15 ft. and 20 ft. (4.6 and 6.1 m) systems only] can
be put into the respective suspended hanger bracket assemblies.
•Manually push the flared end of the heat exchanger tube [it has two (2) holes in it] over the swaged end of the
combustion chamber as far as you can.
•[NOTE: The swaged end of the combustion chamber has a colored line 3 in. (7.6 cm) from the end].
STEP
6•Go to the swaged end of the heat exchanger tube, and with a 2 pound (0.9kg) hammer and a two (2) in. by
four (4) in. (5 cm x 10 cm) block of wood, hit the end of the tube until you have 3 in. (7.6cm) of insertion (the
colored line will still be visible).
•Ensure all tubes are straight and level with the weld seam at the top before installing the screws. See
the TUBE ASSEMBLY TIPS Section for more information.
•Tek screw the tube joint connection through the two holes provided in the flared end with (2) two #12 MULTI-
METAL Tek screws (supplied with the tube).
•Place a reflector over the heat exchanger and into the suspended hanger bracket assemblies.
STEP
7•Slip the burner’s tube into the burner coupler previously installed in Step 4.
•Once the burner is level, straight and inserted against the center stop, use (2) two #12 MULTI-METAL Tek
screws (supplied with the coupling) to fasten the burner to the coupling.
•Insert the “S” hook of the burner support chain into the center hole of the burner suspension bracket and then
crimp the hook closed.
STEP
8•Reflectors must not be angle mounted more than 45°
from horizontal.
WARNING IMPORTANT
•The # 12 MULTI-METAL Tek screws supplied with the coupling
MUST NOT be substituted with any other type of Tek screw. If
you loose them, contact the factory for new ones.
CAUTION
•Make sure all chains are plumb and vertical to prevent damage
to tubes.
•Connect the gas supply as instructed in the GAS
SUPPLY AND GAS PRESSURE section.
•Connect the electrical supply as instructed in the
ELECTRICAL SUPPLY AND THERMOSTATIC
CONTROL section.
WELD SEAM MUST BE ON TOP
FLARED END COMES UP TO, BUT DOES NOT
COVER COLOR INSERTION INDICATOR #12 MULTI-METAL SELF
DRILLING SCREWS (2 EA.)

SRH pg. 20
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
POWERCORD
FROMBURNER
120 VOLT
THERMOSTAT
WIRINGBYINSTALLER
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 (1 OF 2)
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.
•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 Heater (RH) 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.