Schwank STR Series Operating instructions

SP-MSTR-AC-11A
STR Manual
RD: NOV, 2003
RL: 11
KH
INSTALLATION /
OWNER’S
MANUAL
SCHWANK GAS FIRED
STR
SERIES
LOW INTENSITY, TUBE-TYPE
INFRA RED HEATERS
FOR YOUR SAFETY:
Do not store or use gasoline or other flammable
vapours and liquids in the vicinity of this or any
other appliance.
If you smell Gas:
>Extinguish any open flames
>Don’t touch electrical switches
>Call your Gas supplier immediately
FIELD CONVERTIBILITY:
“The conversion shall be carried out in
accordance with the requirements of the
authorities having jurisdiction and in
accordance with the requirements of the B149.1
(latest edition) INSTALLATION CODE” in
Canada, and the ANSI Z223.1 (latest edition) in
the U.S.A
FOR YOUR SAFETY
If you smell gas:
(1) Open windows
(2) Don’t touch electrical switches
(3) (Extinguish any open flame
Immediately call your gas supplier

SP-MSTR-AC-11A
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NOTICE:
Schwank Inc., reserves the right to make
changes to equipment and specifications
without obligation or notification.
All codes are current at the time of printing.
This publication, or parts thereof, may not be
reproduced in any form, without prior written
consent from Schwank Inc. Unauthorized
use or distribution of this publication
is strictly prohibited.
Schwank Inc.
5285 Bradco Boulevard
Mississauga, Ontario,
L4W 2A6
phone: [phone]
fax: [phone]
Schwank Inc.
PO Box 988
Waynesboro,
Georgia,USA 30830
Phone: [phone]
Technical Support: 1-877-446-3727
Fax: [phone]
e-mail: [e-mail]
http://www.schwankheaters.com

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STR GARAGE & WORK SHOP
INFRA-RED GAS TUBE HEATERS
TABLE OF CONTENTS
TOPIC PAGE NUMBER
1. GENERAL.............................................. 1
2. INSTALLATION IN GARAGES ... ...... 2
3. PRE-INSTALLATION SURVEY... ...... 2
TUBE KIT MATRIX....................... ...... 2
4. MOUNTING CLEARANCES................ 2
5. SYSTEMS INCORPORATING 90
DEGREE BENDS AND 180-DEGREE
ELBOWS ......................................... ...... 4
6. SUSPENSION SYSTEM................. ...... 5
7. BURNER AND TUBE
INSTALLTION ............................... ...... 7
8. REFLECTOR INSTALLATION..... ...... 9
9. FLUE VENTING.................................. 11
10. COMBUSTION AIR DUCT.....….… 14
TOPIC PAGE NUMBER
11. GAS SUPPLY INSTALLATION .......15
12. ELECTRICAL AND
THERMOSTAT WIRING ..................16
13. OPERATING SEQUENCE.................17
14. LIGHTING INSTRUCTION……….. 18
15. RECOMMENDED
MAINTENANCE................................18
16,18. WIRING DIGRAMS................19,23
17,19. TROUBLESHOOTING
GUIDES....................................20,24
20. SPARK IGNITION CIRCUIT ............22
21. START UP SHEET.............................23
22. OPTIONAL COMPONENTS .............25
23. LIMITED WARRANTY.....................28

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SP-MSTR-AC-11A
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Page 1
SCHWANK GAS INFRA-RED TUBE HEATER
STR SERIES
INSTALLATION INSTRUCTIONS
Installation of the Schwank STR Series
gas-fired tube heaters must be performed by a
qualified, licensed gas fitter and conform to
all Schwank heating installation design
procedures, including ventilation. All local,
provincial and national code requirements
must be met, ANSI/NFPA No. 88B 1985
(latest edition), which states clearances to
combustible construction or material in stor-
age, from heater and vent, must conform to
standard NFPA No. 54 (ANSI Z223.1 latest
edition), in the U.S.A. In Canada.the current
CSA-B149.1-00 installation codes for gas-
burning appliances and equipment, as well as
the Canadian electrical code CSA C22.1 .
Schwank STR Series heaters may be
installed for heating of residential indoor
spaces. It is beyond the scope of these in-
structions to embrace all conditions that will
be encountered. All system piping must be
supported in accordance with acceptable
industry practices, local codes, and applicable
standards.
1. GENERAL
The following tube lengths and corresponding BTU input ratings are available:
TABLE 1
*Zero to 2000 ft for the USA (For installations above 2000 ft see orifice Chart on Page 16)
** Manufactured and shipped in 10-ft. lengths
MODEL
TOTAL TUBE
LENGTH (FT)**
APPROX NET
WEIGHT IN
LBS
STR 60-30 29’ 4” 120
STR 60-20 19’ 8” 90
STR 45-20 19’ 8” 90
STR 45-10 10’ 0” 60
BTU/HR INPUT
ZERO TO 4,500’ *
ABOVE SEA LEVEL
60,000
60,000
45,000
45,000

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Page 2
3. PRE-INSTALLATION SURVEY
The Schwank STR heating system must
have gas piping of correct diameter,
length, and arrangement to function properly.
For this reason, a layout drawing is
necessary.
Carefully survey area to be heated. For best
results, whenever possible, place burner and
combustion chamber in coldest area.
4. MOUNTING CLEARANCES
Schwank STR Series tube heaters must be
mounted with minimum clearances between
the reflector surface and combustibles as
shown in FIGURE 1, TABLE 2 (page 3).
For recommended heater placement refer to
TABLE 3 (page 3).
Heaters should also be located in relation to
building construction and equipment, to
allowing a minimum clearance of 24 inches
from end of burner housing to enable
servicing and cleaning of burner, blower and
controls.
2. INSTALLATION IN GARAGES
Schwank STR Series tube heaters are
approved for use in garages. The installation
must conform to local building codes or, in
the absence of local codes, to the standard
NFPA No. 54 (ANSI Z223.1 latest edition),
in the U.S.A. and the CSA B149.1-00, and
CAN1.2.16-M81 in Canada.
In a garage installation, the minimum
clearance from the bottom of an infra-red
heater to the upper surface of a vehicle shall
not be less than the certified clearance to
combustible material as indicated on the
heater.
TS- TS- TS- TS-
4510- 4520- 1420- 1430-
CX CX CX CX
1
1
1
1
Stand-Alone Tube Kits require no additional tube kits.
Primary Tube Kits require at least one additional Secondary Tube Kit.
Secondary Tube Kits require a Primary Tube Kit.
Secondary Tube Kit TS-1010-AX can also be used as a 10 ft extension kit. The installer
may need to remove the turbulator (refer to Turbulator Chart in the I&O Manual).
STR 60 20 JS-R060-A N/L
STR 60 30 JS-R060-A N/L
STR 45 10 JS-R045-A N/L
STR 45 20 JS-R045-A N/L
STR TUBE KIT PART # & QUANTITY
REQUIRED
ASSEMBLY CHART
Stand-Alone Kits Only
HEATER MODEL BURNER KIT
STR HEATER KIT

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Page 3
FIGURE 1 MINIMUM CLEARANCES TO COMBUSTIBLES
TABLE 2 MINIMUM CLEARANCES TO COMBUSTIBLES
MODEL
SUSPENDED AT AN ANGLE
UP TO 45 DEGREES
SUSPENDED
HORIZONTALLY
TOP BEHIND FRONT BELOW TOP SIDE BELOW
STR 60 2.0” 1” 17” 34” 1.5” 5.5” 34”
STR 45 4.5” 1” 29” 32” 4.5” 8.5” 32”
IMPORTANT: Continuous operation of single or multi-heater placement
must not cause any combustible material in storage to
reach a temperature in excess of 160OF.
TABLE 3 RECOMMENDED HEATER PLACEMENT
MODEL
MOUNTING
HEIGHTS
(FEET)
MAXIMUM
DISTANCE
BETWEEN
HEATERS (FEET)
DISTANCE – OUTSIDE WALL
TO HEATER LONG AXIS
PARALLEL TO WALL (FEET)
HORIZONTAL ANGLE
STR 60 8 - 14 25 11 – 15 COMBUSTIBLE
CLEARANCE
STR 45 6 - 10 20 8 – 12

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5. SYSTEMS INCORPORATING 90OBENDS AND 180OELBOWS
Page 4
The STR Series radiant tube heater can be
installed in configurations as illustrated in
FIG: 2 (below) with a maximum of two 90o
or one 180oelbow per heater. The use of
radiant elbows reduces the total maximum
vent allowable. See SECTION 9 (page 11):
Flue Venting.
Both the 90oand 180oelbows are shipped as
a kit with two end-plate hangers to close off
the reflector ends each side of the elbow (s).
The reflector must be secured with four
screws to each of the end-plate-hangers.
SEE FIG: 3 (PAGE 5) and FIG: 6 (PAGE 6).
FIGURE 2 SYSTEM CONFIGURATIONS
System Configuration
1 Straight line
2 “U” tube with 180-degree elbow kit
3 “L” tube with 90-degree elbow kit
4 Twinned tubes into common TEE flue
vent
Venting Options
A Flue vent through wall 4”
B Flue vent through wall or roof 6”
C Flue vent through roof
D Flue vent into building, exhaust fan
interlocked with heater
E Combustion air intake from outside
through wall
F Combustion air intake from outside
through roof
G Combustion air intake from inside
building
IMPORTANT: On STR 60 and 45 models, a minimum of 10’ of straight
radiant tube must be connected to the burner before any
elbow.
A
F
C
G
D
E
B
1
2
3
4
G
G

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Page 5
6. SUSPENSION SYSTEM
End plate hangers are provided to support
reflectors and tubes at both ends of heater,
that is at burner and at flue, See FIG:3
(below), FIGURES:4, 5 and 6 (page 6). Wire
hangers are provided to support the reflectors
and tubes along the full length between the
two end-plate hangers. SEE FIGURES 4, 5,
(PAGE 6) and SECTION 7 (page 7).
The STR 45-10 DOES NOT require wire
hangers, as the reflector is supported at
both ends by the end-plate-hangers.
The system configuration and available
support locations must be considered in order
to locate the radiant tubes correctly.
Labour and material can be reduced by
locating (system configuration permitting)
directly under structural members such as
joists, steel or wood beams, etc.
Chain is recommended for hanging the tube
system, connecting the hangers to beam sup-
port as illustrated in FIGURE: 8 (PAGE 7).
To support burner and keep it level, a sepa-
rate suspension chain must be attached to the
eye hook at the flange-end of the burner and
angled slightly back over burner. SEE FIG: 4
(PAGE 6). This will permit normal expansion
and contraction of the tube system (If rigid
devices such as rods are used in place of
chain, then swing joints or other means of
sufficient length must be provided to com-
pensate for expansion).
FIGURE 3 MOUNTING REFLECTOR TO END-PLATE HANGER
1 End-Plate-Hanger Flange
over the Reflector
2 End-Plate-Hanger Flange
under the Reflector
3 Screws securing Reflector
to End-Plate-Hanger
4 Chain Hole for horizontal
suspension
5 Chain Hole for up to 45º
suspension
6 Opening for tube
7 Focus-Shield Reflector
6
5
4
7
3
1
2
1
7

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Page 6
FIGURE 4:/ TYPICAL HANGER AND SUPPORT SPACING RECOMMENDATIONS
5 Sight Glass
6 Aluminized Tube with Flange
7 Tube Couplers
8 Painted Steel Tube (s)
1 End-Plate-Hangers
2 Wire Hangers
3 Burner Assembly
4 Combustion Air Intake
9 Focus-Shield Reflector
10 Flue-Vent terminal
11 Burner Support Chain
12 Hanger Support Chains
13 Reflector Stabilizer
FIGURE 5 HANGER ARRANGEMENTS
FIGURE 6 END-PLATE-HANGER/ELBOW INSTALLATION
1 End Plate Hanger
2 Focus Shield Reflectors
3 End Plate Hanger Flange OVER Reflector
4 End Plate Hanger Flange UNDER Reflector
590
0(shown) or 1800Elbow
6 Tube/Elbow Coupler
7 Point at which Swaged Tube fits into
elbow and Swaged Elbow fits into Tube.
1 Two Wire Hangers per Each
Middle Section
2 Use End-Plate-Hangers at
Burner & Flue Ends (& each
side of any elbow)
3 End-Plate-Hanger Flange
UNDER Reflector
4 End-Plate-Hanger Flange
OVER Reflector
5 Butt Sight Glass Ring to End
Plate Hanger
10
13
2
11
4
3
5
6
8
7
91
1
12
3" 4"
"ALL TUBES MUST BE SUSPENDED BY TWO (2) HANGERS PER 10' LENGTH,
MOUNTED APPROXIMATELY 6" TO 12" IN FROM EACH TUBE END.
Note Exception: First and last hanger (end plate hangers) must be mounted 4” away from end of tube
1
2
2
33
44
5
6
7
1
5
2
4
3
ADDITIONAL
TUBE(S)
FIRST
TUBE

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Page 7
FIGURE 7 REFLECTOR ARRANGEMENTS
FIGURE 8 SUGGESTED MOUNTING HARDWARE
7. BURNER AND TUBE INSTALLATION
With all hangers suspended at the same
height, insert first aluminized tube section
through 4" hole in first end-plate hanger and
onto wire hanger. Or for a 10ft heater ,
through the hole in the second end plate
hanger. End-plate hanger should butt against
the sight glass on the bottom of the tube. SEE
FIG: 4 (page 6). Bolt burner to flange on first
tube section. SEE FIGURE 9 (page 8). Sub-
sequent lengths of tube can then be installed,
joining them together one inside the other and
locking the joints using the aluminized steel
coupler c/w 2 bolts. SEE FIG:10 (page 8).
Slacken the bolts and slip the clamp over the
end of the tube to be joined, making sure the
Swaged end of the tube is fully inserted into
the plain end of the tube before re-positioning
the clamp. The clamp should then be centred
across the joint before tightening up.
If a turbulator is necessary it will be factory
installed into the tube (s). The tube (s) will be
marked stating where it must be installed in
the system, SEE TABLE 4 (page 8) for the
models which require turbulators.
Turbulators are ALWAYS installed at the
vent end of the heater.
EYE BOLT THROUGH
HOLE IN BEAM
BEAM CLAMP
WITH EYE SCREW
EYE SCREW PIPE RING
OR CLEVIS
BAR-JOIST
CLAMP
EYE BOLT THRU
HOLE IN BEAM
BEAM CLAMP
W/EYE SCREW
EYE SCREW PIPE RING OR
CLEVIS
BAR JOIST
CLAMP

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Page 8
FIGURE 9 BOLTING BURNER TO FLANGED TUBE
1Tube
2 Tube Coupler
3 Swaged section of tube.
4 Point at which the Swaged
tube slides into another section
of tube.
5 Once the two tubes are joined,
place centre of the coupling
over the line of the joint and
tighten.
TABLE 4
MODEL TURBULATOR
LENGTH
STR 60-30 14’ 0”
STR 60-20 14’ 0”
STR 45-20 5’ 0”
STR 45-10 5’ 0”
NOTE: Where required, the STR Series
Heaters will be supplied with turbulators,
factory installed into the end tube (s) of the
system configuration.
FIGURE 10 COUPLER KIT
1 Eye Hook
2 Fifth Nut (Holding Inner Burner to
Housing) Do not loosen or Remove.
3 Lock Washers x 4
4 Burner Flange Adapter
5 Nuts x 4 {Nuts could be shipped c/w
lock washers as one piece}.
6 Flanged Section of Heating Tube
•Align the four burner bolts through
the tube flange, secure tightly with
lock washers and nuts
•Note: A Flange Gasket is not re-
quired for this application.
•Secure suspension chain to eye hook
in order to stabilize burner.
3
21
4
5
1
2
34
STR-45 models
STR-60 Models

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Page 9
FIGURE 12 PLATE HANGER/ELBOW INSTALLATION
1 End-Plate-Hangers
2 Focus Shield Reflectors
3 End-Plate-Hanger Flange OVER
Reflector
4 End Plate Hanger Flange UNDER
590
0(shown) or 1800Elbow
6 Tube Couplers
7 “Point at which Swaged Tube is fully
inserted into elbow and Swaged end of
elbow is fully inserted into tube.
FIGURE 11 MOUNTING REFLECTOR TO END PLATE HANGER
8. REFLECTOR INSTALLATION
After burner and tubes have been installed,
slide the focus shield reflectors one at a time,
into the wire hangers. (the end of the first and
last focus shield reflectors must be secured to
the first and last end plate hangers with four
screws each. SEE FIG: 11 and 12 (ABOVE).
As each successive focus shield reflector is
installed on an in-line installation, the ends of
the focus shield reflectors will meet at the
centre of the reflector slide and will provide
continuous coverage over the entire tube
system.
1 End-Plate-Hanger Flange
over the Reflector
2 End-Plate-Hanger Flange
under the Reflector
3 Screws securing Reflector
to End-Plate-Hanger
4 Chain Hole for horizontal
suspension
5 Chain Hole for up to 45º
suspension
6 Opening for tube
7 Focus-Shield Reflector
1
2
2
33
44
5
6
7
6
5
4
7
3
1
2
1
7

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Page 10
FIGURE 13 REFLECTOR SLIDE
For 20ft and 30ft lengths reflector slides are pro-
vided to support and attach one focus shield re-
flector to another. Slide focus shield reflector (1)
over reflector slide (2), fit focus shield reflector
standing edge (3) into reflector slide lip (4). Fo-
cus shield reflectors should touch at centre of
reflector slide. ( SEE FIG: 13 BELOW)
Reflectors must BE FREE To slide due to ex-
pansion. Do not hard fasten. DO NOT SCREW
REFLECTORS AND SLIDES TOGETHER
Each focus shield reflector section can be
individually adjusted to either side, up to 45O
from horizontal, by orienting the hangers
appropriately. SEE FIG: 14 & 15 (page 11).
Note: Each heater comes with one 9’5”
reflector, the balance of reflectors for each
heater are 9’ 8” long. The 9’ 5” reflector can
be mounted in any location.
Note that for both horizontal and angle
mounting, the tube must be level. Improper
mounting can result in overheating of
controls and combustible materials. Use only
non-combustible mounting hardware.
Side reflectors can be added to the heaters as
an option. They should be secured directly to
the focus-shield reflector using "S" hooks or
chains. Drill three holes into reflector flange
along side that matches up with three holes
already in side reflector. Mount side
reflector as close as possible to the focus-
shield reflector.
Reflector Slide
Reflector
1
2
1
3
4

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Page 11
FIGURE 15 HANGER ARRANGEMENTS
1 Two Wire Hangers per
Each Middle Section
2 Use End Plate Hangers at
Burner & Flue Ends (&
each side of any elbow)
3 End Plate Hanger Flange
UNDER Focus Shield
Reflector
4 End Plate Hanger Flange
OVER Focus Shield
Reflector
5 Butt Sight Glass Ring to
End Plate Hanger
FIGURE 14 REFLECTOR ARRANGEMENTS
9. FLUE VENTING
The STR series are approved for direct vent applications.
1
5
2
4
3
ADDITIONAL
TUBE(S)
FIRST
TUBE
The system must not be operated in a negative air condition, unless combustion
air is brought in from outside directly to the burner. If a severe negative pressure is ex-
perienced or anticipated, order heater requesting custom Air Switch c/w Air Hose from
Schwank.
* Ensure you specify the correct heater model number when ordering.
NOTE:

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Page 12
All venting must be single wall "C" vent
except the portion of vent passing through a
combustible wall or roof. Type "B" vent may
then be used as per CSA requirement.
When venting horizontally the flue vent
system should slope downwards approxi-
mately 1/4" per foot toward the vent terminal,
starting at the termination of the radiant tube.
For horizontal through the wall venting, the
approved Schwank 4” or 6” vent terminal
should be used. Install the flue vent terminal
18" from the outside wall to the inside end of
terminal opening. The flue vent terminal used
must be of the approved types supplied by
Schwank or supplied by an approved "B"
vent manufacturer.
The total maximum allowable combined
length of vent and combustion air duct is 50'
for STR 60 and 45. Total maximum allow-
able vent and duct is reduced by ten feet for
every 90oelbow installed in the vent or duct.
Should the system be installed with a 90oor
with a 180oelbow in the radiant tube, 10' or
20' respectively must be deducted from the
length of vent and duct.
Neither the flue vent nor the combustion air
duct is to exceed 50ft in length. Lengths
greater than those allowed may create con-
densation problems and will void CSA design
Certification. The horizontal flue vent shall
not terminate less than the following
distances:
•Three feet above grade level
•Twelve inches from combustion air inlet
of any heater with input up to 100,000
Btu/hr.
•Three feet from combustion air inlet of
any heater with input over 100,000 Btu’s
•Directly above a gas utility meter or
service regulator
•Directly below a soffit or overhang
•Twelve inches from sides and bottom and
eighteen inches from top when installed
close to the corner of a building.
VENTED APPLICATION

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Page 13
As an option two heaters may be vented
through an approved common 4" X 4" X 6"
flue Tee, (supplied by Schwank Ltd.) with a
maximum of two per heaters per Tee. Both of
the heaters must then be controlled by one
single common thermostat or "ON/OFF" op-
erating switch.
All vent pipe used with a slip-fit connection
must be mechanically secured.
Where the vent pipe passes through areas
where the ambient temperature is likely to
produce condensation of the flue gases, the
vent pipe shall be insulated with a suitable
material as approved and specified by the
insulation manufacturer. Insulation may be
subject to temperatures over 5000F.
The vent system must always be adequately
supported to prevent sagging. (Fig: 4 page 6)
FIGURE 16 FLUE VENT CONNECTION
The end of the Tube is Swaged and will directly accommodate regular “C” Vent and
fittings for venting to outside. The “C” Vent connection to the radiant tube end must
be secured with sheet metal screws.

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For ease of installation, this heater has been
provided with a fresh air intake duct hood. It
can be used as an outdoor intake hood to
bring combustion air to the heater from
outside, or when using air from the room, it
should be installed over the intake flange on
top of burner as a dust cap.
Do not use plastic or cloth flexible duct for
fresh air intake.
In installations where chlorinated hydrocarbons are in
use, such as Trichloroethylene, Chloroethylene Nu or
Refrigerants, it is essential that combustion air be brought
in from non-contaminated areas. Burning the fumes from
these gases will create Hydrochloric Acid fumes, which are
detrimental to humans, equipment and buildings.
10. COMBUSTION AIR DUCT
Where heater is operated in a negative air
condition or in contaminated air atmosphere
such as woodworking shops, air for
combustion must be ducted from outside to
intake flange on burner blower. Combined
maximum length of combustion air duct and
flue vent is 50' for STR 60 and 45. The
total maximum vent allowable is reduced by
10' for every 90ovent elbow installed.
INSTALLER'S CONVENIENCE KIT: (optional)
•1 - 10' x 4" Flexible Aluminium Fresh Air
Intake Duct.
•1 - Length of Hanging Chain
•1 - 4” Horizontal Vent Terminal
The air intake inlet shall not be located less than the following distances:
Page 14
•Three feet above grade
•Twelve inches from flue vent terminal of
any heaters with input up to 100,000 BTU
•Three feet from flue vent terminal of any
heaters with input over 100,000 BTU
CAUTION:

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11. GAS SUPPLY INSTALLATION
It is recommended that the approved flexible connector supplied by Schwank be installed be-
tween the heater and gas piping.
If rigid connection is made, compensation for normal gas-
supply piping expansion and radiant tube expansion must be
provided. All piping must conform to local codes.
During any pressure testing of the gas- supply
piping system. The heater must be isolated
from the gas-supply piping system by closing
its individual manual shutoff valve, supplied
by installer.
DO NOT use pressures greater than 1/2 psig.
to pressure-check the heater.
TEST FOR LEAKS: All gas piping and
connections must be tested for leaks after the
installation is completed, by applying soap
suds solution to all connections and joints. If
bubbles appear, leaks have been detected and
must be fixed.
DO NOT USE A MATCH OR OPEN FLAME
OF ANY KIND TO TEST FOR LEAKS.
NEVER OPERATE THE HEATER WITH
ANY LEAKING CONNECTIONS.
The supply system should be checked first
with heater turned "OFF" followed by an-
other check with heater turned "ON".
IMPORTANT:
The minimum supply-line pressure at the
inlet to the heater regulator must not, in
any instance, be lower than 5.0 inches of
water column pressure, for natural gas ,
and 11.0 inches of water column pressure
for propane gas. The supply-line pres-
sure must be checked with all heaters
and appliances operating in the building.
A sealed regulator is supplied with the
heater to maintain the proper manifold
pressure when the main burner is
operating.
Page 15
CAUTION:
TOP VIEW
FLUE VENT
FLANGED TUBE
Air Intake Vent

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IMPORTANT:
Page 16
For ease of connection, each heater is
supplied with a three prong electrical cord,
which is to be connected to a standard 120V
receptacle. Receptacle must be grounded.
Each tube heater requires 145VA to operate.
This heater is supplied with a low voltage
thermostat. Set Heat Anticipator to the high-
est setting.
TABLE 5
12. ELECTRICAL AND THERMOSTAT WIRING
NOTE: Access to the manifold pressure-test
port is on the top of the valve. A 3/16" Allen
wrench is necessary to check this. When
checking or setting the manifold pressure, a
U-tube manometer should be used.
Gauges which measure in ounces per square
inch or pounds per square inch are not
accurate enough to properly measure or set
the pressure. Readings should be made in
inches of water column.
GAS TYPE LINE PRESSURE
INCH WATER COLUMN
MINIMUM MAXIMUM
MANIFOLD PRESSURE
INCH WATER COLUMN
AT-TAP IN GAS VALVE
Natural Gas
Propane
5.0 14.0
11.0 14.0
3.5
10.0
Do not install the thermostat in the direct radiant stream.
MODEL
NO
STD
ORIFICE
(DMS)
FOR USE AT ALTITUDES ABOVE (FEET)
2000 3000 4000 5000 6000 7000 8000
STSp-45N JS-0729-DM JS-0729-
DM
JS-0730-
DM
JS-0730-
DM
JS-0730-
DM
JS-0730-
DM
JS-0731-
DM
JS-0731-
DM
STSp-45L JS-0746-DM JS-0746-
DM
JS-0746-
DM
JS-0748-
DM
JS-0748-
DM
JS-0748-
DM
JS-0749-
DM
JS-0749-
DM
STSp-60N JS-0725-DM JS-0726-
DM
JS-0727-
DM
JS-0727-
DM
JS-0728-
DM
JS-0728-
DM
JS-0729-
DM
JS-0729-
DM
STSp-60L JS-0742-DM JS-0742-
DM
JS-0743-
DM
JS-0743-
DM
JS-0743-
DM
JS-0744-
DM
JS-0744-
DM
JS-0745-
DM
ORIFICE - ALTITUDE CONVERSION CHART
12a- HIGH ALTITUDE INSTALLATIONS
In Canada all of the STR radiant tube heaters are
approved for altitudes zero to 4500 feet above sea
level and do not require de-rating.
In the USA if a heater is to be installed at altitudes
above 2000 ft, the input must be reduced by 4% per
1000 ft and the orifice must be changed according to
the chart below.