Space-Ray LTS Series Owner's manual

INFRARED GAS HEATERS
emtipii*
■ gffrFv^
INSTALLATION AND OPERATION INSTRUCTIONS
OWNER / INSTALLER : For your safety this manual must be carefully and thoroughly read
and understood before installing, operating or servicing this heater.
INFRARED RADIANT TUBE HEATER
Models:
LTS SERIES LTU SERIES
LTS 40
LTU 80
LTS 50
LTU
90
LTS 60
LTU 100
LTS 75 LTU 110
LTS 80
LTU
120
LTS 90
LTU 125
LTS 100
LTU 130
LTS
110
LTU 140
LTS
120
LTU 150
LTS 125
LTU
160
LTS 130
LTU
175
LTS 140
LTS 150
LTS 160
LTS
175
IINSTALLER : This manual is the property of the owner. Please present this manual to
the owner when you leave the job site.
AWARNING : Improper installation, adjustment, alteration, service, or maintenance can
cause property damage, injury or death. Read the installation, operation and maintenance
instructions thoroughly before installing or servicing this equipment.
IIMPORTANT: SAVE THIS MANUAL FOR FUTURE REFERENCE.
SPACE-RAY*
A Division ofGas-FIrod Products, Inc.
Post Office Box 36485 ( 28236 ) • 305 Doggett Street (28203J • Charlotte, North Carolina
Phone [phone] • Fax [phone] • vvww.spaceray.com • email: [email protected]
Form #43155010

TABLE OF CONTENTS
secT/ow p E s cmpriQ N base
1) General Information. 1
2) LTU 80-175 Series - Specifications. 2
3) LTU 80-175 Series - Packing List. 2
4) LTU 80-175 Series - Dimensions. 3
5) LTU 80-175 Series - Heater Assembly. 4
6) LTU 80-175 Series - Joining of Body Sections. 4
7) LTS 40-175 Series —Specifications. 5
8) LTS 40-175 Series - Packing List. 5
9) LTS 40-175 Series - Dimensions. 6
10) LTS 40-175 Series - Typical Layouts. 7
11) LTS 40-175 Series - Assembly/Joining of Body Sections. 7
12) Adding Optional 90* Elbow (LTS Only). 8
13) Adding Optional Corner Reflector (LTS Only). 8
14) Attaching Control Box Assembly. 8
15) Attaching Draft Inducer Assembly. 9
16) Multiple Hanging & Draft Inducer Positions.10
17) Typical Suspension Methods.10
SECTION DESCRIPTION PAGE
18) Inclined Mounting Instructions (LTS Only).11
19) Minimum Clearances To Combustibles.11
20) Gas Connections And Regulations.12
21) Instructions For Pressure Test Gauge Connection.12
22) Electrical Connections.13
23) Venting.13
24) Air For Combustion.16
25) Direct Outside Air For Combustion.16
26) Lighting And Shutdown Instructions.16
27) Ignition System Checks.16
28) Sequence Of Operation.17
29) Troubleshooting Direct Spark Ignition System.18
30) Motor And Blower Wheel Check.19
31) Cleaning And Annual Maintenance.19
32) Replacing Parts.19
33) Installation Data.19
34) Replacement Parts Guide.19
! WHAT TO DO IF YOU SMELL GAS :
! Do not try to light any appliance. Extinguish any open flame. Open windows.
! Do not touch any electrical switch; do not use any telephone In your building.
! Immediately call your gas supplier from a neighbor’s telephone. Follow the gas supplier's Instructions.
! If you cannot reach your gas supplier, call the fire department.
This heater compiies with ANSI Z83.6 (current standard) and CAN 1-2.16. Copies of the National Fuel Gas Code (ANSI Z223.1-latest edition)
are avaiiable from the CSA at 8501 East Pieasant Vaiiey Road. Cleveiand, Ohio 44131 or 55 Scarsdale Road, Don Milis, Ontario M3B 2R3. Ali
NFPA codes are avaiiable from the National Fire Protection Association, Batterymarch Park, Quincy, Massachusetts 02269.
1) GENERAL INFORMATION _
This heater is a seif-contained infrared radiant tube heater for use in iocations where fiammabie gases or vapors are not
generaliy present (as defined by OSHA acceptable limits) and is intended for the heating of nonresidential spaces.
INSTALLATION REQUIREMENTS
Installation of this heater must be in accordance with all applicable codes shown in the instructions and/or the local codes
and authorities having jurisdiction. In Canada, the installation must conform to current CAN/CGA-B149.1/2 Installation Code
in the absence of local codes. Heaters shall be installed by a licensed contractor or licensed installer. Clearances to
combustibles as outlined in this manual should always be observed. In areas used for storage of combustible materials where
they may be stacked below the heater, NFPA54 requires that the installer must post signs that will “specify the maximum
permissible stacking height to maintain the required clearances from the heater to combustibles.”
Every heater shall be located with respect to building construction and other equipment so as to permit access to the heater.
Each installer shall use quality installation practices when locating the heater and must give consideration to clearances to
combustible materials, vehicles parked below, lights, overhead doors, storage areas with stacked materials, sprinkler heads,
gas and electrical lines, and any other possible obstructions or hazards. Consideration also must be given to service accessibility.
The heater, when installed in aircraft hangars and public garages, must be installed in accordance with ANSI/NFPA 409-latest
edition (Standard for Aircraft Hangars), ANSI/NFPA 88a-latest edition (Standard for Parking Structures), and ANSI/NFPA 88b-
latest edition (Standard for Repair Garages) with the following clearances:
a. At least 10 feet above the upper surfaces of wings or engine enclosures of the highest aircraft that may be housed in the
hangar and at least 8 feet above the floor in shops, offices, and other sections of hangars communicating with aircraft
storage or service areas.
b. At least 8 feet above the floor in public garages. AWARNING : Minimum clearances marked on the heater must be
maintained from vehicles parked below the heater.
- (FOR CANADA ONLY) -
a. Installation of this appliance is to be in accordance with latest edition of CAN 1-B149.1 (Installation Code for Natural Gas
Burning Appliances and Equipment), and/or CAN B149.2 (Installation Code for Propane Gas Burning Appliances and
Equipment).
b. For installation in public garages or aircraft hangars, the minimum clearances from the bottom of the infrared heater to
the upper surface of the highest aircraft or vehicle shall be 50 percent greater than the certified minimum clearance, but
the clearance shall not be less than 8 feet. _
Although these heaters may be used in many applications other than space heating (e.g., process heating), Gas-Fired
Products, Inc. will not recognize the warranty for any use other than space heating.
Form #43155010
Feb-04
- 1 -

This heater is for indoor instaiiation and Covered Patio Instaliation only and can be used in either Vented or Unvented mode.
The term Unvented actually means Indirect Vented. While the products of combustion are expelled into the building, national
codes require ventilation in the building to dilute these products of combustion. This ventilation may be provided by gravity or
mechanical means.
This heater Is not an explosion proof heater. Where the possibility of exposure to volatile and low flash point materials exists,
it could result in property damage or death. This heater must not be installed in a spray booth where the heater can operate
during the spraying process. Consult your local fire marshal or insurance company.
LTS Series Only : Since straight tube heaters are always hotter at the control end than at the draft inducer end, always
observe the minimum recommended mounting heights shown on the specification sheets and In Section 7 of this manual.
Use U-tube configuration instead of straight tubes for spot or area heating (e.g., where a single heater is utilized for space
heating).
AWARNIMG : Certain materials or objects, when stored under the heater, will be subjected to radiant heat and could be
seriously damaged. Observe the Minimum Clearances to Combustibles listed In the manual and on the heater at all times.
! ATTENTION : SAVE THIS MANUAL FOR FUTURE REFERENCE.
2) LTU 80-175 SERIES - SPECIFICATIONS
Model No.
Btu/hr
Input
Heat
Exchanger
Length
Total
Heater
Length
Flue Restrictor
Plate I.D. & Part #
Orifice Size
Minimum
Mounting Height
Natural Gas Propane Gas
@
Horizontal
@
45° Angle
LTU80
80,000
30’ 1T-6V2"
1-1/2”
#42741050 #19
(0.166)
#38
(0.102)
12’
12’
LTU90 90,000
1-1/2”
#42741050 #16
(0.177)
#36
(0.106)
12’
12'
LTUlOO 100,000
1-5/8” #42741060 #14
(0.182)
#33
(0.113)
12’
12’
LTUllO 110,000
1-3/4” #42741070 #10
(0.194)
#31
(0.120)
14’
13’
LTU120 120,000
1-3/4”
#42741070
13/64
(0.203) 1/8
(0.125)
14’ 13'
LTU125
125,000
1-7/8” #42741080
#5
(0.206)
#30
(0.129)
14’
13’
LTU 130 130,000
1-7/8” #42741080
#4
(0.209)
3.3mm
(0.130)
14’
13’
: z _
LTU125* 125,000
40’
22’-GW
1-7/8”
#42741080
#5
(0.206)
#30 (0.129)
14’
13’
LTU130* 130,000
1-7/8” #42741080
#4
(0.209)
3.3mm
(0.130)
14’
13’
LTU140* 140,000
2-1/32” #42741090 5.5mm
(0.216)
#29
(0.136)
15’
14’
LTU150* 150,000
2-1/32” #42741090 5.7 mm
(0.224)
#28
(0.140)
15’
14’
LTU 160* 160,000
2-1/4” #42741100 5.8mm
(0.228)
#27 (0.144)
15’
14’
LTU175* 175,000
2-1/4”
#42741100
“C”
(0.242)
3.8mm
(0.150)
16’
15’
^ These models require the use of an additional 5’ body section.
Type
Gas-Pipe Tube
Flue Fresh Air Electrical
Current
Gas;
Connection:
Diameter:
Connection: Connection: Supply:
Rating:
Natural
or Propane
NPT
(Female)
4” 6” Round 6’ Round
120 Volt,
60Hz, 1 Phase 2.6 Amp
Fuse Rating:
Ignition System:
In-line: 2 Amp 250V
(for 24V Circuit)
Spark Module: 3 Amp 250V
(for 24V Circuit)
Direct Spark
(with 30-second prepurge period)
3) LTU 80-175 SERIES - PACKING LIST
A) Control/Draft Inducer Package OTY
Control Box Assembly 1 |
Draft Inducer & Junction Box Assembly 1 I ^
Flue Restrictor Plate (attached to blower housing with 3 locknuts) . 1
Plastic Vacuum Air Tube (#03988120).1
4” X 6” Starting Collar (#42892000).1
Control Fastener Kit (#42907010).1
containing ; #8-32 Screws (#02166010) & Nuts (#02127030).2 ea.
Va - 20 Locknuts (#02167010).6
Tube Flange Gasket (#42921000).2
Installation & Operation Instructions (#43155010).1
- 2 -
CONTROl/DRAFT INDUCER
PACKAGE NUMBERS:
MODEL NO.
PART NO,
—
NATURAL GAS-
LTU80-N5 .
__#42883010
LTU90-N5.-
_.#42883030
LTU100-N5 #42883050
LTU110-N5
.#42883070
LTU120-N5
#42883090
LTU125-N5
#42883110
LTU130-N5
#42883130
LTU140-N5 .....#42883190
LTU150-N5-
_ . ..#42883210
LTU160-N5 ____#42883230
LTU175-N5
____#42883250
PROPANE GAS-
LTU80-L5^ .#42883020
LTU90-L5 #42883040
LTU100-L5
.#42883060
LTU110-L5 _#42883080
LTU120-L5_ ...#42883100
LTU125-L5 .. ... . #42883120
LTU130-L5 .....#42883140
LTU140-L5 __ _#42883200
LTU150.L5^
_ ._. ,#42883220
LTU160-L5 _#42883240
LTU175-L5. ..^^#42883260
Form #43155010
Fel>04

B) LTU 80-175 Body Package Descriptions (Package Number Is Indicated on the outside of each corresponding carton.)
■ LTU 80-130 (30’ TUBE^
Each 30’ LTU tube heater contains one 15’ Body Package as listed below.
(1)
#42881000.15 Ft. Bodv Package fOTV-ii containing:
a) #42914000, Pre-assembled 15’ ALC steel U-tube (two 24-hole flanges) with Reflector (QTY-i)
b) #42895000, Control End Reflector (QTY-l)
c) #42896000, Foot End Reflector (QTY-l)
d) #02266010, Speed Clips (QTY-20)
■ LTU 125-175 (40’ TUBE)
Each 40’ LTU tube heater contains one 15’ Body Package and one 5’ Body Package as listed below.
(1)
#42881000,15 Ft. Body Package (QTY- 1 ) (same as listed above)
(2)
#42882000. 5 Ft. Bodv Package (OTY-ii containing:
a) #42915000, Pre-assembled 5’ ALC steel tube (two 24-hole flanges) with Reflector (QTY-l)
b) #42907020. Bodv Fastener Kit rOTY-lt containing: #02167010. V4-20 Locknuts (OTY-12i
#02259000, V4-20 Machine Screws (QTY-12)
#02266010, Speed Clips (QTY-2)
c) #42921000, Tube Flange Gasket (QTY-2)
Junction Box
Exhaust Hood
-Required for UNVENTED use-
4”x6” Starting Collar
Form #43155010
FeiM}4
- 3 -

5) LTU 80-175 SERIES - HEATER ASSEMBLY
1. Place the flanges of the control end reflector (packaged with the 15’ body section) flush with the end of the body reflector.
Secure by sliding the speed clips onto the reflector edges. Evenly space the speed clips on the sides and top of the
reflector to provide a snug fit. Place the foot end reflector (not shown) on the opposite end of the body reflector and
secure as described above. DO NOT relocate the tube supporVhanger brackets, especially at the control end of the heater.
Slide the reflector toward the U-bend and leave a 3” space between the control end reflector and the control box.
2. Attach the control box and gasket to the right hand tube flange and secure with the ’4-20 locknuts. The control box must
be mounted with the perforated fresh air plate on top, facing the ceiling.
3. Attach the draft inducer assembly and gasket to the left hand tube flange and secure with the V4-20 locknuts. A flue
restrictor plate Is attached to the draft Inducer weld stud. Make sure this remains In place while the draft Inducer Is
being attached to the heater body. NOTE : The draft inducer can be mounted in either a verticai, a 45° or a horizontai
position. Refer to the diagram on multiple hanging and draft inducer positions (Section 16).
4. Take the end of the SJO cable from the junction box and insert it through the 3/8” connector of the control box. Connect
the wire leads of the SJO cable to “1” and “2” of the terminal block. Refer to the Connection Wiring Diagram (Section 22).
Tighten the screws of the connector.
5. Place the starting collar on the draft inducer and secure with the #8-32 screws and nuts.
6. If the heater is for UNVENTED use, place the exhaust hood (supplied as an accessory) on top of the starting collar. Secure
with the #8 sheet metal screws. The exhaust hood must be mounted only In an upright position and directed towards
the reflector body.
7. If heater is to be vented to the outside of the building, place the flue pipe directly onto the starting collar and terminate
with an approved vent cap.
1/2” MPT Gas Pipe Connection
6) LTU 125-175 SERIES - JOINING OF BODY SECTIONS
Models LTU125-175 - ► These models require the use of an additional
5’ body section, as shown on the heater dimension sheet. Follow the
instruction below for joining these sections.
1. Join the tube flanges of the body sections together with the gaskets in
between. Secure the flanges with the ’4-20 screws and locknuts
provided in the 5’ body package.
2. Pull the reflector onto the 15’ body section over the reflector on the 5’
body section to maintain approximately an one-inch overlap. Secure
the reflectors by sliding the speed clips on the reflector edges as show
in the diagram. One speed clip is required for each side of the reflector.
- 4 -
Form #43155010
Fel>04

Tighten the reflector clamps once the
reflectors are secured with the speed clips.
3. Assemble the control box, draft Inducer, and
other components as previously described in
the heater assembly instructions.
7)
LTS 40-175 SERIES - SPECIFICATIONS
Model No.
Btu/hr
Input
Flue Restrictor
Plate I.D. & Part #
Orifice Size
Minimum
Mounting Height
Natural Gas
Propane Gas
@Horlzontal
@45° Angle
LTS40
40,000 1”
#42741040 #31
(0.120)
#49
(0.073)
10 feet
9 feet
LTS50
50,000
1-1/8”
#42741030 3.3mm
(0.130)
#46
(0.081)
11 feet 10 feet
LTS60 60,000 1-7/32”
#42741020 #27
(0.144)
#43
(0.089)
12 feet
11 feet
LTS75
75,000 1-7/16”
#42741010 #20
(0.161)
#39
(0.099)
13 feet
12 feet
LTS80
80,000 1-1/2”
#42741050 #19
(0.166)
#38
(0.102) 13 feet 12 feet
LTS90
90,000
1-1/2”
#42741050 #16
(0.177)
#36
(0.106)
13 feet
12 feet
LTSlOO
100,000 1-5/8”
#42741060
#14
(0.182)
#33
(0.113)
13 feet
12 feet
LTSllO
110,000 1-3/4”
#42741070 #10
(0.194) #31
(0.120)
14 feet 13 feet
LTS120
120,000 1-3/4”
#42741070 13/64
(0.203)
VS
(0.125) 14 feet 13 feet
LTS125
125,000 1-7/8”
#42741080
#5
(0.206)
#30
(0.129)
14 feet 13 feet
LTS130
130,000 1-7/8” #42741080 #4
(0.209)
3.3mm
(0.130)
14 feet 13 feet
LTS140
140,000 2-1/32”
#42741090 5.5mm
(0.216)
#29
(0.136)
15 feet
14 feet
LTS150 150,000 2-1/32”
#42741090
5.7mm
(0.224)
#28
(0.140)
15 feet 14 feet
LTS160
160,000 2-1/4”
#42741100
5.8mm
(0.228)
#2127
(0.144)
15 feet 14 feet
LTS175
175,000
2-1/4”
#42741100
“C”
(0.242)
3.8mm
(0.150)
15 feet
14 feet
Type
Gas-Pipe Tube
Flue Fresh Air Electrical
Current
Gas: Connection: Diameter:
Connection: Connection: Supply: Rating:
Natural
or Propane
Mi’NPT
(Female) 4”
6" Round * 6’ Round *
120 Volt,
60Hz, 1 Phase
2.6 Amp
* 4’ Round for Models LTS40-75
8 )
LTS 40-175 SERIES - PACKING LIST
A)
Control/Draft Inducer Package OTY
Control Box Assembly 1 ~
Draft Inducer & Junction Box Assembly .1_
Flue Restrictor Plate (attached to blower housing with 3 locknuts) . 1
Plastic Vacuum Air Tube (#03988120).1
4" x 6” Starting Collar (#42892000).1
Control Fastener Kit (#42907050).1
containing : #8-32 x 3/8’ Screws (#02166010) & Nuts (#02127030).2 ea
y4-20 Locknuts (#02167010).6
Speed Clips (#02266010).8
Tube Flange Gasket (#42921000).2
Installation & Operation Instructions (#43155010).1
1 Fuse Rating: j
Ignition System:
In-line: 2 Amp 250V
(for 24V Circuit)
Spark Module: 3 Amp 250V
(for 24V Circuit)
Direct Spark
(with 30-second prepurge period)
Form #43155010
Feb4)4
-5-
CONTROl/DRAFT INDUCER
PACKAGE NUMBERS:
Mooetw.
PART NO.
- NATURAL GAS-
LTS40-N5„
...#43187010
LTS50-N5._
....-.#43187030
LTS60-N5.
....#43187050
LTS17-N5„
.... #43187070
LTS80-N5„
„ _#43216010
LTS90-N5
#43216030
LTS100-N5
#43216050
LTS110-N5
#43216070
LTS120-N5
#43216090
LTS125-N5
#43216110
LTS130-N5_
__^„ #43216130
LTS140-N5.
....„#43216150
LTS150-N5^
..#43216170
LTS160-N5
#43216190
LTS175-N5
#43216210
-
PROPANE GAS -
LTS40-L5
.#43187020
LTS50-L5
#43187040
LTS60-L5 . .
.#43187060
LTS75-L5.._
___#43187080
LTS80-L5._
_ __ #43216020
LTS90-L5_
_#43216040
LTS100-L5^
.... #43216060
LTS110-L5
. ... #43216080
LTS120-L5.
..-.-.#43216100
LTS125-L5_
__#43216120
LTS130-L5..
_#43216140
LTS140-L5
.#43216160
LTS150-L5
#43216180
LTS160-L5
#43216200
LTS175-L5
#43216220

B) LTS 40-175 Body Package Descriptions (Package Number Is Indicated on the outside of each corresponding carton.)
SYSTEM LENGTH- ►
15’
20’ 25’ 30’ 35’ 40’ 45’
50’
1(1)
#43337040, Starl/End 10 Ft. Body Package - includes: Quantity-
1 2 1
2 1 2 1 2
a) #43182060, Pre-assembled 10’ ALC Steel Tube (one 24-bole
flange) with reflector (QTY-l)
b) #30462980, Tube Coupling (QTY-l)
c) #42907140, Reflector/Coupling Fastener Kit (QTY-l)
containing : #02189020, Self-drilling screws (QTY-2)
_#02266010, Speed Clips (QTY-2)_
(2)
#43337010,10 Ft. Body Package - includes: Quantfty-
- -
1 1
2
2 3 3
a) #43182040, Pre-assembled 10’ ALC Steel Tube (no flanges)
with reflector (QTY-l)
b) #30462980, Tube Coupling (QTY-l)
c) #42907140, Reflector/Coupling Fastener Kit (QTY-l)
containing: #02189020. Self-drilline Screws fOTY-21
#02266010, Speed Clips (QTY-2)
(3)
#43336030, Ending 5 Ft. Body Package - Includes: Quantity-
1 1
-
1
-
1
-
a) #43181050, Pre-assembled 5’ ALC Steel Tube (one 24-hole
flange) with reflector (QTY-l)
b) #30462980, Tube Coupling (QTY-l)
c) #42907140, Reflector/Ctoupling Fastener Kit (QTY-l)
containing: #02189020. Self-drilllne Screws fOTY-2)
#02266010, Speed Clips (QTY-2)
C) #43208010, Elbow Accessory Package
OTY
#43175001, Elbow.1
#02189020, #20-16 x % Self-drilling Screws.2
#30462980, Tube Coupling.1
D) #43342000, Corner Reflector Accessory Package
OTY
#43345000, Corner Reflector Assembly.1
#02266010, Speed Clips.4
CORNER REFLECTOR
90° ELBOW
END REFLECTOR
9)
LTS 40-175 SERIES - DIMENSIONS
5 FT.
BODY
SECTION
60”
(Sft)
1-
Reflector
t
lb
T -4 SWe View (
d
1
)Tube Support/Hanger Bracket (QTr-2)
13”
Emitter Tube
10 FT.
BODY
SECTION
Tube Support/Hanger Bracket (QTY-2)
Emitter Tube
DRAFT INDUCER
120” _^
t
(10 ft)
-1 1^8" r
Reflector
_
1 M Side View r
6”
Opening for
Eiectricai
Connection
Fiue
Restrictor Piate
3/8” Connector
EXHAUST HOOD
■ Required for UNVENTED use -
r—-
1 1
CO
Bottom View
HZl L
11 ”
I
4’x6’ Starting Coilar*
* 4’ Starting Coilar for LTS40-75
¥
trTi-
u
- 6 -
Form #43155010
Feb-OA

10) LTS 40-175 - TYPICAL LAYOUTS
8i
1 ww
888 ,8
40ET III ||
SYSTEM III II
in-'n
= I s ! )
.. Bb 8 li
SYSTEM 1 1
1*— 1
888 i8
Ill II
1 1
I'- 1
m i8
S«^M ip—%
888 i8
Hi II
SYSTEM I I
r- 1
M .8
35ET ill f|
SYSTEM ■ ■ ■ ■ ■
1
1 '
0 straight
EMITTER LENGTH
0 LShape
MODEL
Min. Max.
0 UShape
LTS 40
15 Ft.
20 Ft.
0 ZShaoe
LTS 50
15 Ft. 30 Ft.
LTS 60 20 Ft. 30 Ft.
LTS 75
20 Ft.
30 Ft.
LTS 80
30 Ft. 40 Ft.
LTS 90 30 Ft. 40 Ft.
LTSlOO
30 Ft. 40 Ft.
LEGEND
LTSllO
30 Ft. 40 Ft.
n Control Unit
LTS120
30 Ft.
40 Ft.
• Draft Inducar Unit
LTS125
30 Ft.
50 Ft.
■■ ■ 10 Ft. Body Section
LTS130
30 Ft.
50 Ft.
■ 5 R. Body Section
LTS140 40 Ft.
50 Ft.
^ 90* Elbow
LTS150 40 Ft.
50 Ft.
LTS160 40 Ft. 50 Ft.
LTS175 40 Ft. 50 Ft.
NOTES :
1) The control unit must be connected directly to a 10 ft.
aluminized steel body section in all configurations.
2) Joining of two 90° elbows directly together to form a
"Z" shape is NOT permitted.
3) Any configuration of components not shown in the
iliustrations may be used except as noted in 1 and 2
above.
11) LTS 40-175 - HEATER ASSEMBLY/JOINING OF BODY SECTIONS _
During field assembly of the LTS series heater body sections, the recommended procedure is as follows:
1. Before hanging heater sections, first determine the actual layout of the system (see Section 10 for details).
Consideration must also be taken for flue pipe, fresh air ducting, gas piping, etc., before hanging the heater. Typical
suspension methods are shown in Section 17. DO NOT relocate the tube suppoii/hanger brackets, especially at the
control end of the heater.
2. Hang each heater body section individually. DO NOT attach the heater body sections together on the ground and attempt
to hang the entire system at onetime. The weight of the Individual heater body sections can cause misalignment and
damage to the heater.
3. Join the body sections together and secure with tube couplings as follows:
AWARNING : The following coupling tightening Instructions must be followed properly to avoid future problems.
a. Place the compression coupling over the end of the tube from one body section, with the tightening bolts located on
the bottom and facing the installer. NOTE : There is a small hole at the centerline of the coupling that can be used
to sight the end of the tube.
b. Partially tighten the bolt nearest the end of the tube (approximately half closed).
c. Slide the ends of the tube from the opposite body section into the coupling. Make sure both tube ends are butted
together.
d. Finish tightening both bolts to 40-60 ft.lbs. torque to ensure a complete seal.
e. Check to ensure that the hardware is completely closed and that the band is seated on the reaction block and
interference pins as illustrated below.
f. Check to see if the reaction block is firmly seated on the tube.
g. Self-drilling screws are provided to prevent any possible movement of the tubes from the coupling. Install the
screws as shown using an electric or air screwdriver with approximately 2500 rpm speed. Pre-punched holes in the
coupling make it easier to install these self-drilling screws.
h. Once all the heater body sections are attached, make sure that the heater system is level . If it is not, slight
adjustments can be made using the turnbuckles. (See Section 17.)
tIMPORTANT : NEVER REUSE A COUPLING .
Always Install a new coupling only and torque as per Instructions above and the diagrams that follow.
Form #43155010
Fob4>4
- 7 -

INCORRECT
INSTALLATION
CORRECT
INSTALLATION
4. The tube at the coupling joints must be covered. Slide the reflectors together and provide a one-inch overlap. (This will
allow for the natural expansion and contraction of the heater when in operation.) Secure reflectors together by sliding
speed clips on the reflector joint edges. One speed clip is required for each side of the reflector. Tighten the reflector
clamps. !D0 NOT OVER-TIGHTEN! Make sure that the reflector can slide under the clamp during heater operation.
12) ADDING OPTIONAL 90° ELBOW (LTS ONLY)
1. The optional 90° elbow must be located a minimum
of 10 ft. after the control box.
2. Hang the body sections in a 90° ("L") shaped pattern.
Allow spacing for the elbow. The distance from one
end of the elbow to the centerline of the opposite leg
is 13" as shown.
3. Join the tube ends of the body sections and the
elbow together and secure with tube couplings as
described in Section 11.
(Optional)
13)
ADDING OPTIONAL CORNER REFLECTOR
(LTS ONLY)
1.
2.
3.
Place the corner reflector over the reflectors of both
body sections.
Secure by sliding speed clips on the reflector edges.
One speed clip is required for each side of reflector.
The corner reflector can be used only when the long
axis of the heater Is level and mounted in a
horizontal position.
0
/Y^
Speed Clip ^ ^
CORNER REFLECTOR
(Optional)
s*
14)
ATTACHING CONTROL BOX ASSEMBLY
1. Attach the control box and gasket to end of tube flange and secure with 1/4-20 locknuts. NOTE : The control box must
be mounted to a 10 ft. aluminized steel body section regardless of configuration used.
2. A 3/8" connector is located on the left side of the control cabinet to provide strain relief for field wiring to the draft
inducer junction box (refer to Section 22 on Electrical Connections and Connection Wiring Diagram for wiring between the
control box and the draft Inducer.)
Form #43155010
Fob-04

Assemble the end reflector (packaged
in the control/draft inducer package)
flush with the end of the main body
reflector. Secure by sliding speed clips
onto the reflector edges. Evenly space
the speed clips on the sides (one each
side) and top (two required) of the
reflectors to provide a snug fit. Leave
a 3" space between the end reflector
and the control box assembly.
The control box must be mounted with
the perforated fresh air plate on top,
facing the ceiling.
NOTE :The wiring connection diagram
is iocated on the inside access panel
and on the inside junction box panel
Speed Clip
(Qty. 4)
End Reflector
Perforated Fresh Air Plate
■ \\ 1/4-20 Locknut M
^ ^ H
Tube Flange (24^ole)
Tube Flange Gasket
Clearances to Combustibles Label
Heater Body
-Access Panel
-Lighting & Shutdown Instructions
Bu
Sight Glass
• 1/2’ MPT Gas Pipe Connection
15) ATTACHING DRAFT INDUCER ASSEMBLY
1. Attach the draft inducer assembly and gasket to end of tube flange and secure with 1/4-20 locknuts. A flue restrictor
plate is loosely attached to the draft inducer weld studs. Make sure this remains in place while the draft inducer is being
attached to the heater body. NOTE : The draft inducer can be mounted in a vertical, a 45°, or a horizontal position. Refer
to the diagram on Multiple Hanging and Draft Inducer Positions (Section 16).
2. Disconnect the piece of SJO cable (if equipped) from the junction box and discard. This is used only on LTU series
heaters.
3. The 3/8" connector used to hold the SJO cable will remain to provide strain relief for field wiring of the control box and
the draft Inducer (refer to the Electrical Connections and Connection Wiring Diagram for wiring between the control box
and the draft Inducer in Section 22).
4. Place the starting collar on the draft inducer and secure with #8-32 screws and nuts.
5. If heater Is to be VENTED to the outside of the building, place the flue pipe directly onto the starting collar and secure with
#8 sheet metal screws. Terminate with an approved vent cap.
6. If the heater Is for (INVENTED use, place the exhaust hood (supplied as an accessory) on top of the starting collar. Secure
with #8 sheet metal screws. The exhaust hood must be mounted only in an upright position and directed toward the
reflector body.
7. Assemble the end reflector (packaged in the control draft inducer package) flush with the end of the main body reflector.
Secure by sliding speed clips onto the reflector edges. Evenly space the speed clips on the sides (one each side) and top
(two required) of the reflectors to provide a snug fit. Leave a 3” space between the end reflector and the draft inducer
Form #43155010
Feb.04
- 9 -

17) TYPICAL SUSPENSION METHODS
Various means of suspending the heater can be used. See the following drawings for typical examples.
1. Use only noncombustible materials for hangers and brackets.
2. A minimum No. 2 chain with a working load limit of 115 lbs. is required.
3. Turnbuckles should be used with chains to allow leveling of the heater. All “S” hooks and eye bolts must be manually
crimped closed by the installer.
3. When using rigid means for heater suspension (rod, flat bar, etc.) provide sufficient lengths orswingjoints to compensate
for expansion. See Figures b and c.
4. Heaters subject to vibration must be provided with vibration isolating hangers.
5. Heaters must not be supported by gas or electric supply lines and must be suspended from a permanent structure with
adequate load capacity.
Space-Ray recommends that the
„ m Minimum body sectlons be hung by chains
No. 2 Chain H wKh tumbuckles. This will allow
n slight adjustments after assembly
No.'"2cSn y 3/16-xrwide Thraade^d TU and heater expanslon/contractlon
— R RatBar during operation.
Minimum
No. 2 Chain
3/16" xr wide
Fiat Bar
1/2" diameter hole
Tube Support/Hanger Bracket
(End View)
5/16" Screw
Nut & Washer
TYPICAL SUSPENSION METHODS
- 10 -
Form #43155010
Feb<l4

18) INCLINED MOUNTING INSTRUCTIONS (LTS ONLY) _
These inclined mounting instruction relate to LTS series heaters (straight tubes) that do not utilize the elbow accessory. These
heaters have been tested and design certified by the CSA for 2yi2” pitch (10°) inclined mounting of the heater from the
control box to the draft inducer assembly as shown in the following diagram.
Draft Inducer
Detail A-^
The purpose of this type mounting is to allow the heater to be mounted in the
plane of the roof (particularly in modern “Butler" type buildings frequently used
today). This will typically put the heater out of the way while still providing the
warmth and comfort. The heater can be inclined upwards from the control box
to the draft inducer at a distance of 2 inches up for every linear foot of the
heater length. The total rise for each draft inducer is tabulated in the table
below:
TOTAL DRAFT iNDUCER HEiGHT ABOVE HORiZONTAL FOR 2”/12” PITCH INSTALLATIONS
Tube Length
Models 15 Ft. 20 Ft. 25 Ft.
30 Ft.
35 Ft.
40 Ft.
45 Ft.
50 Ft
LTS 40-LTS 75
30”
o 1; o 10
60”
LTS 80-LTS120
60”
70”
LTS125-LTS130
60” 70” 80”
90” 100”
LTS140-LTS175
R
o 00
90” 100”
The heater is subject to all other requirements presented in these Installations Instructions, particularly the Clearances to
Combustibles. If you plan to use this type of installation, order the Space Ray Inclined Mounting Kit, Part #43238000.
19) MINIMUM CLEARANCES TO COMBUSTIBLES
Minimum clearances to combustibles shall be measured
from the outer surfaces as shown in the following diagram;
End
Celling
t
Below
Horizontal
Celling
MINIMUM CLEARANCES TO COMBUSTIBLES
Mounted Horizontally
Angle Mounted at 45” |
Model No. Sides Celling*
Below Ends 45' Front 45' Rear
LTS/LTU 40, 50
27”
6”
40” 30” 48”
12”
LTS/LTU 60, 75
27”
6” 60”
30” 48”
12”
LTS/LTU 80, 90
52”
6”
84” 30’
52” 12”
LTS/LTU 100
66” 6”
88”
40” 66” 20”
LTS/LTU 110,120,125,130
66” 6”
101”
41”
66”
20”
LTS/LTU 140,150,160,175
84” 6”
106” 48” 84”
24”
* When used indirect vented,
the clearance must be:
12” for LTS40-75 and
18" for LTS/LTU80-175.
If optional corner reflectors
are not used, the clearance
must be 18”
NOTE : The clearances specified above must be maintained to combustibles and other materials that may be damaged by
temperatures 90°F above ambient temperature. Clearances to combustibles are posted on the control box. In areas used
for storage of combustible materials where they may be stacked below the heater, NFPA54 requires that the Installer must
post signs that will “specify the maximum permissible stacking height to maintain the required clearances from the heater
to combustibles.” Space-Ray recommends posting these signs adjacent to the heater thermostat or other suitable location
that will provide enhanced visibility.
Form #43155010
Feb4>4
- 11 -

20) GAS CONNECTIONS AND REGULATIONS
1. Connect to the supply tank or manifold in accordance with the iatest edition of National Fuel Gas Code (ANSI Z223.1),
and local building codes. Authorities having jurisdiction should be consulted before the installation is made. (In Canada,
refer to the latest edition of CAN Standard B.149-1 & -2, Installation Codes for Gas Burning Appliances and Equipment.)
2. All gas supply lines must be located in accordance with the required clearances to combustibles below the heater as
listed on the nameplate of the heater.
3. Pipe joint compounds must be resistant to the action of liquefied petroleum gases.
4. Straight tube heaters (LTS series) can expand/contract during operation. If rigid pipe connections are planned, provisions
for expansion/contraction must be provided. Where local codes do not prohibit, a CSA or U.L approved flexible connector
(minimum 5/8” I.D.) is recommended between the rigid piping and the heater. A union and an approved shut off valve
should be installed before the control valve inlet. The shut off valve should be installed within 6 feet of the union.
5. This appliance is equipped with a step-opening, combination gas valve. The maximum supply pressure to the appliance
Is 14” W.C. or 1/2 P.S.I. If the line pressure is more than the maximum supply pressure, then a second stage regulator
which corresponds to the supply pressure must be used.
6. If a 2''<‘ stage regulator is used and gas seeps through it, the redundant combination gas valve is designed to lock out.
Pressure build-up in the supply lines prior to the heater must be released before proper heater operation.
7. After all gas connections have been made, make sure the heater and all gas outlets are turned off before the main gas
supply is turned on. Turn the gas pressure on and check for leaks. To check for leaks, apply a soap suds solution to all
connections and joints or check by one of the methods listed in Appendix D of the National Fuel Gas Code.
¥ Ava//abfe as Accessories
SIDE VIEW
21) INSTRUCTIONS FOR PRESSURE TEST GAUGE CONNECTION
♦ Supply Pressure
1. T he installer will provide a 1/8’ N.P.T. plugged tapping, accessible for test gauge connection immediately upstream of
the gas supply connection to the heater.
♦ Manifold Pressure
1. Turn the gas valve to the “OFF” position. Remove the 1/8’ plug from the combination gas valve at the outlet pressure tap
and connect a 1/8’ nipple to the tapped hole. Connect the gauge to the nipple. Turn on the gas supply.
2. With the main burner operating, check the burner manifold pressure using a water manometer. Gauges that measure
pressure in pounds per square inch are not accurate enough to measure or set the manifold pressure. All measurements
MUST BE made when this heater and ail other gas burning equipment that is connected to the gas supply system are
operating at maximum capacity.
3. The combination gas valve is factory set and should acaution
not be adjusted. If full rate adjustment is required,
remove the cover screw. Using a small screwdriver,
turn the adjustment screw clockwise O to increase
or counterclockwise O to decrease the gas pressure
to the burner. Replace the cover screw. NOTE : The
step opening pressure of this gas valve Is not
adjustable.
4. C heck the burner at step pressure, observing burner
ignition and flame characteristics. The burner should
ignite properly and without flashback to the orifice,
and should remain lit. Cycle the burner several
times. Wait 30 seconds between cycles to allow the
Never jumper these terminals. This
Pressure Reeulator AcUustment shorts out valve coil and may burn
/ (Under Cap Screw) Out heat anticipator in thermostat.
Form #43155010

step opening combination gas vaive or servo
regulator to resume the first step action. Also,
observe the burner operation at full pressure. Repeat
after allowing to cool. (Gas pressures are shown In
the following table.)
1 GAS PRESSURE TABLE |
MANIFOLD
SUPPLY PRESSURE |
GASTyPE
PRESSURE
Minimum^
Maximum
Naturai Gas
3.5” W.C.
5” W.C. 14” W.C.
Propane Gas 10.0” W.C. 11” W.C. 14” W.C.
^ Minimum permissible gas supply pressure for purpose of input adjustment.
22) ELECTRICAL CONNECTIONS _
1. All electric wiring shall conform to the latest edition of the National Electrical Code (ANSI/NFPA No. 70), or the code
legally authorized in the locality where the installation is made.
2. The unit must be electrically grounded in accordance with the National Electrical Code (ANSI/NFPA No. 70-latest edition).
In Canada, refer to current standard C22.1 Canadian Electrical Code Part 1.
3. The wiring providing power to the heater shall be connected to a permanently live electrical circuit, one that is not
controlled by a light switch.
4. The electrical power to the heater shall be through an approved fused disconnect switch. The switch shall be located in
the vicinity of the heater (check local codes for allowable distances) and should be identified as the heater control switch.
All electrical wiring must be located in accordance with the required clearances to combustibles below the heater as
listed on the nameplate of the heater.
5. When connecting the supply circuit to the heater, wiring material having a minimum size of 14 AWG and a temperature
rating of at least 105°C shall be used.
6. The installer will provide strain relief for the power supply wires at the junction box.
7. LTS SERIES ONLY : The installer will provide type SJO wire cable having minimum size of 18 AWG and connect the ends
to the draft inducer junction box and the control box. Secure with 3/8” connectors as previously described in the
attachment of the control box and draft inducer. Connect wire leads as shown in the Connection Wiring Diagram. The
SJO cable should be located and secured to protect it from mechanical damage.
SUPPLY CIRCUIT
CONNECTION WIRING DIAGRAM
3. A isplaceable 3-ainp fuse {l-l/V long) Is fitted to the Ignition Control Module.
Single Heater Per Thermostat
Multiple Heaters Per Thermostat
4 -
Ground
Neutral
Fused
Disconnect
Switch
Serviee
Thermostat Switch
S-B
Ground
Neutral
Additional Heath's
rm Hot I — 1
Additional Heaters
1 “ ( L=J
Fused Thennostat
Disconnect
Switch
[71 Service
m
[71 Service
[U Switch
D
Heater Heater
TYPICAL WIRING AND THERMOSTAT CONNECTIONS
23) VENTING _
A. BASIC FLUE VENTING — Venting must comply with the latest edition of the National Fuel Gas Code (ANSI Z223.1-latest
edition) or the authority havingjurisdiction. Other venting references are in the equipment voiume of the ASHRAE Handbook.
Form #43155010
FeM>4
-13-

SINGLE HEATER VENTING (VERTICAL THROUGH THE ROOF)
1. When venting the heater to outside of building through a roof, use single-wall metal pipe. This is to be constructed of
galvanized sheet metal or other approved noncombustible corrosion-resistant material as allowed by state or local codes.
2. A vent passing through a combustible roof shall extend through a 2-inch clearance roof thimble. Double-wall, Type Event
must be used for the portion of the vent system which passes through the roof. An approved vent cap (Leslie “VersaCap”-
Type B) must be attached to end of the flue.
3. The maximum equivalent length of vent pipe should be carefully observed. A safety switch in the heater is designed to
shut the heater off before excessive flue restriction causes bad combustion. Refer to the Vent Sizing Table at the end of
this section for required vent pipe diameter.
■ Minimum Equivalent Length - 5 ft. of Pipe
■ Maximum Equivalent Length - 100 ft. of Pipe
Use the following correction factors to obtain the equivalent length:
a. Subtract 15 ft. if the run is horizontal.
b. Subtract 10 ft. for an approved vent cap.
c. Subtract 10 ft. for each elbow beyond 15 ft. from the heater.
d. Subtract 15 ft. for each elbow within 15 ft. of the heater.
4. Avoid locating elbows in the first 5 ft. of vent pipe whenever possible. Limit to (2) 90° elbows. When vent pipe is in a
horizontal run, it must have 1/4 inch per foot rise.
5. Joints between sections of piping shall be fastened by sheet metal screws or other approved means and should be sealed
to prevent leakage of flue gas into building. Aluminum or Teflon tape suitable for 550°F (3M Company tapes 433 or 363)
or silicone sealant is recommended.
6. All portions of the vent pipe shall be supported to prevent from sagging.
7. When the vent pipe passes through areas where the ambient temperature is likely to induce condensation of the flue
gases, the vent pipe should be insulated and a condensation drain should be provided.
8. Minimum clearance for single-wall flue pipe to combustible material shall be 6 inches. This may be reduced when the
combustible material is protected as specified in the National Fuel Gas Code or the authority having jurisdiction.
9. Single-wall metal pipe shall not originate in any unoccupied attic or concealed space and shall not passthrough any attic,
inside wall or concealed space, or through any floor. For the installation of a single-wall metal pipe through an exterior
combustible wall, refer to latest edition of the National Fuel Gas Code or the authority having jurisdiction.
10. A venting system shall terminate at least 3 ft. above any forced air inlet located within 10 ft.
SINGLE HEATER VENTING (HORIZONTAL THROUGH SIDEWALLI
When venting the heater horizontally through a combustible outside sidewall, the same requirements listed previously for
venting Vertical Through The Roof apply except as follows:
1. A vent passing through a combustible wall must pass through a 2-inch clearance thimble (Air-Jet #4VT or #6Vr or Ameri-
Vent #4EWT or #6EWT) or other thimbles that are listed by a nationally recognized testing agency.
2. An approved vent cap (Breidert-Type L or equal) must be attached to the end of the vent pipe.
■ Minimum Equivalent Length - 5 ft. of Pipe
■ Maximum Equivalent Length = 75 ft. of Pipe
NOTE : To minimize problems associated with condensation in long horizontal runs, vent pipe can be insulated.
3. When venting through a sidewall, the horizontal vent pipe shall rise not less than 1/4 inch per foot from the start of the
vent system to the vent terminal. All portions of the vent pipe shall be supported to prevent sagging.
4. A minimum clearance of 6 inches must be maintained between the outside wall and vent cap.
5. The horizontal venting system shall not terminate:
a. Less than 4 ft. (1.2m) below, 4 ft. (1.2m) horizontally from or 1 ft. (30cm) above any door, window or gravity air inlet
into any building. The bottom of the vent terminal shall be located at least 7 ft. (2.1m) above grade or above snow
accumulation level as determined by local codes.
b. Less than 3 ft. (0.9m) from a combustion air inlet.
c. Less than 3 ft. (0.9m) from any other building opening or any gas service regulator.
d. Directly over areas where condensate or vapor could create a nuisance or hazard or be harmful to the operation of
gas utility meters, regulators, relief valves, or other equipment. Building materials should be protected from flue
gases and condensate.
6. In regions of the country where prevailing winds are consistently higher than 40 mph, it may be necessary to terminate
the vent system above the roof level.
MULTIPLE HEATER VENTING fCONNECTIONS INTO A COMMON VENT OR MANIFOLD)
Requirements for venting of multiple heaters are the same as described for SINGLE HEATER VENTING except as follows:
1. The common vent size and total vent height is normally determined by the number of heaters per common vent, length
of horizontal connector runs, and connector rise. Connector lengths should be as short as possible and have a minimum
V 4 ” per ft. rise. Without regard to connector rise and total vent height due to many possible venting configurations, the
following should be observed:
a. Common vent pipe & vent connector diameter should be no less than that shown in the following Vent SizingTable.
b. The connector length should be no more than 75% of the vertical portion of vent above the connector.
c. Where possible, use a Y-connector to the common vent.
-14-
Form #43155010
Fol>04

2. Material for connectors should be constructed of galvanized sheet metal or other approved noncombustible corrosion
resistant material as allowed by state or local codes. All common vent pipe should be double wall, Type B vent.
3. Avoid unnecessary bends. Limit to two (2) 90° elbows.
4. The entire length of vent connector shall be readily accessible for inspection, cleaning and replacement.
5. Groups of heaters with a common vent must be controlled by a common thermostat.
AWARNING : COMMON VENTING OF MULTIPLE HEATERS IN CONFINED SPACES IS PROHIBITED. If any heater connected
to a common vent system for multiple heaters Is found Inoperative, the heater should be disconnected from the vent system
and Its entrance Into the vent system capped.
B. INDIRECT VENTING (UNVENTED HEATERS) — This heater requires ventilation in the building to dilute the products of
combustion and provide fresh air for efficient combustion. Where unvented heaters are used, gravity or mechanical means
shall be provided to supply and exhaust at least 4 CFM per 1,000 Btu/hr input of installed heaters. Exhaust vents must be
located at the highest point above and in the vicinity of the heaters, and the inlet vents must be located below the level of the
heaters. An exhaust hood (Part #42924040 for LTS40-75 or Part #42924000 for LTS/LTU80-175) must be placed directly on
the flue pipe starting collar (4” starting collar for LTS40-75 or 4"x6” starting collar for LTS/LTU80-175) when used unvented
and must be mounted only In an upright position and directed towards the reflector body.
NOTE : If a size is not available use the next larger size.
THE FOLLOWING ILLUSTRATIONS AND TABLE OF VENT SIZES FOR COMMON
VENTING OF MULTIPLE HEATERS ARE IN ACCORDANCE WITH THE NATIONAL
FUEL GAS CODE ANSI Z223.1-LATEST EDITION. NFPA #54-UTEST EDITION,
EQUIPMENT VOLUME OF 1988 ASHRAE HANDBOOK, CURRENT CAN/CGA-
B14g.V2-M8G INSTALLATION CODE, AND AGA PUBUCATION NO. 10M5.85
2.5-2 ON FUNDAMENTALS OF GAS APPLIANCE VENTING AND VENTIUTION-
REVISED BUT ARE NOT A PART OF THE CSA CERTIFICATION.
Form #43155010
Feb-04
-15-

24) A IR FOR COMBUSTION _
If indoor combustion air is to be supplied for a tightly enclosed area, one square inch of free area opening shall be provided
below the heater for each 1,000 Btu/hr of heater input. Adequate clearances round the perforated fresh air plate must be
maintained at all times. In larger open areas of buildings, infiltration normally is adequate to provide air for combustion.
25) D IRECT OUTSIDE AIR FOR COMBUSTION _
Outside combustion air should be supplied directly to the heater when the building is subject to negative pressure,
contaminants or high humidity are present in the building air. These contaminants include paints, solvents, corrosive vapors
or any other foreign particles that may cause damage to the heater or result in poor combustion.
Outside combustion air can be brought directly to the heater by a 6”diameter* duct less than 50 ft. long or equivalent. This is
attached to a 6” diameter* starting collar. The starting collar is fitted to the top of the control cabinet after first removing and
discarding the perforated cover. An approved vent cap must be placed directly on the end of the outside combustion air inlet
pipe. The combustion air inlet should be a minimum of 3 ft. (0.9m), either vertically or horizontally, from the flue vent
termination. The air intake terminal must be located not less than 1 ft. (30cm) above grade, it is good installation practice to
supply combustion air from the same pressure zone as the vent outlet. Avoid bringing combustion air to the heater from an
attic space. There is no guarantee that adequate combustion air will be supplied.
If the heater is installed less than 2 ft. from the ceiling, a flexible
transition section (e.g., flexible aluminum duct) must be provided
to allow for expansion/contraction of straight tube heaters (LTS
series).
In colder climates, where necessary, insulate the outside
combustion air duct. Avoid locating the outside combustion air
duct directly above the control box. Provide a capped cleanout T
as necessary. In high humidity applications, the control box
should be sealed with silicone sealer.
In multiple heater applications, the combustion air intake may be
ducted individually or common ducted in the same configuration
as shown for venting in Section 23. For combustion air intake
duct sizing, please refer to the Vent Sizing Table and use the
diameter indicated, based on the number of heaters per duct.
VERTICAL
THROUGH THE ROOF
6” Starting Collar*
(Field Supplied)
Vent Cap (Leslie VersaCap Type B}
6” diameter^ Single-Wall Pipe
50 ft. long (maximum)
I
HORIZONTAL
THROUGH SIDEWALL
1/A” per ft. slope downwards
towards vent terminal
Perforated Cover
fRemove)
*4’’forLTS40-75
26) L IGHTING AND SHUTDOWN INSTRUCTIONS
1) Turn on the gas supply.
2) Set the thermostat to call for heat.
3) Ignition should occur after the 30-second air purge.
4) If ignition fails, the unit will spark for approximately
21 seconds and go into safety lockout. Turn the
thermostat (power) off for 60 seconds to take the
system out of lockout.
5) If the heater does not light, shut off gas completely
for 5 minutes before attempting to relight.
6) ACAIITION : The heater must be grounded. Poor
grounding will give nuisance lockouts, particularly
during momentary power interruptions.
7) To shut down the heater, turn off the gas and the
electrical supply.
NOTE : The Lighting and Shutdown Instructions are also
shown on the permanent nameplate attached to the
heater control box.
27) I GNITION SYSTEM CHECKS _
> STEP 1 : CHECK IGNITION CABLE.
a) Make sure that the ignition cable does not touch any metal surface.
b) Make sure that connections to the stud terminal and the igniter/sensor are clean and tight.
c) Make sure that the ignition cable provides good electrical continuity.
> STEP 2 : CHECK IGNITION SYSTEM GROUNDING.
(Nuisance shutdowns are often caused by a poor or erratic ground.) A common ground is required for the module, igniter,
flame sensor and main burner.
a) Check for good metal-to-metal contact between the igniter bracket and the main burner.
b) Check the ground lead from the GND (BURNER) terminal on the module to the igniter bracket. Make sure connections
are clean and tight. If the wire is damaged or deteriorated, replace It.
c) Replace igniter/sensor with factory replacement part if insulator is cracked.
Form #43155010
F«b-04

> STEP 3 : CHECK SPARK IGNITION CIRCUIT.
AWARNING : THE IGNITION CIRCUIT GENERATES A 20,000 VOLT OPEN CIRCUIT AND ELECTRICAL SHOCK CAN RESULT.
a) Check ignition cable.
b) Check external fuse on the module.
c) Verify power (24V) at module input terminals and output terminal to gas valve.
d) Replace spark module if fuse and power are OK.
> STEP 4 : CHECK FLAME SENSOR CIRCUIT.
a) Turn off heater at thermostat.
b) Connect a meter (dc microammeter scale) in series with the ground lead as shown in the diagram. Use a Honeywell
W136 Test Meter or equivalent. Connect the meter as follows;
• Disconnect the ground lead at the electronic control.
• Connect the black (negative) meter lead to the electronic control GND terminal.
• Connect the red (positive) meter lead to the free end of the ground lead.
c) Restart the system and read the meter. The flame sensor current must be steady and measure at least 1.5 micro amps.
d) If the meter reads less than the minimum or if reading is unsteady:
• Make sure burner flame is capable of providing a good rectification signal.
• Make sure fasteners securing Igniter/sensor are tightened to assure
correct positions. DO NOT relocate Igniter/sensor.
• Check for excessive (over 1000°F) temperature at ceramic insulator on
flame sensor. Excessive temperature can cause short to ground. DO NOT
relocate igniter/sensor.
• Check for cracked ceramic insulator, which can cause short to ground, and
replace sensor if necessary.
• Make sure that electrical connections are clean and tight. Replace
damaged wire
e) Remove microammeter and reconnect ground wire. Return system to normal
operation.
tarn
Multipurpose
Meter
f -a
VALW
VALVE
GND
0 _
/Or
o
'CJ
>
Modulo Black (-)
FLAME SENSOR CURRENT CHECK
- USE uA SCALE -
28) SEQUENCE OF OPERATION
INSUFFICIENT AIRFLOW -
SYSTEM SHUTS OFF
(RED light OFF)®
IF NO SPARK,
SYSTEM GOES INTO LOCKOU
(AMBER light OFF)®
J THERMOSTAT (or Controller) CALLS FOR HEAT
1 (GREEN light ON)
r
DRAR INDUCER STARTS
(Purge Period)
DIAPHRAGM AIR SWITCH ON
(RED light ON)
T
SPARK ON
(AMBER light ON)
I
-4
i
FAILURE TO IGNITE-
SYSTEM GOES INTO LOCKOUT
(AMBER light OFF) ®
VALVE OPENS
(AMBER light ON)
IF POWER INTERRUPTED,
SYSTEM SHUTS OFF UNTIL
POWER IS RESTORED
(ALL lights OFF)
BURNER IGNITES-
SPARK CUTS OFF
I
IF FLAME-OUT OCCURS, SPARK
RETURNS FOR RE-IGNITION®
THERMOSTAT (or Controller)
SATISFIED, BURNER OFF
(ALL lights OFF)
draft
- Octagons represent actions resulting from possible malfunction.
NOTES :
® - Insufficient airflow Indicates defective
inducer or restricted flue.
® - Corrective action and system reset are necessary.
® - If burner does not re-ignite, system goes into
lockout. Corrective action and system reset are
necessary.
Form #43155010
Fob434
-17-

29) TROUBLESHOOTING GUIDE OF DIRECT SPARK IGNITION SYSTEM
TURN GAS SUPPLY ON. SET
THERMOSTAT TO CALL FOR HEAT.
Power To Control Module?
(25 vac nominal)
✓ Check line voltage.
✓ Low voltage transformer.
✓ Thermostat and wiring.
✓ Diaphragm air switch.
Ignition Module 30-Second
Delay For Prepurge?
Check fuse and replace if necessary.
Replace module if fuse checks okay.
Spark Across Igniter or
Igniter/Sensor Gap?
Main Burner Lights?
✓ Turn off gas supply.
✓ Pull ignition leads and check spark at ignition stud.
Spark Okay?
✓ Check ignition cabie, ground wiring, ceramic insulator and gap
(3/16”) and correct.
✓ Check boot of the ignition cable for signs of melting or buckling.
✓ Check for 25 vac across valve and valve terminals on ignition
module. If no voltage, replace module.
✓ Check electrical connections between ignition module and gas
control. If okay, replace gas control.
Spark Stops when Burner
Is Lit?
System Runs Until Call
for Heat Ends?
! NOTE : If module goes Into lockout, reset system.
✓ Check continuity of sensor cable and ground wire.
✓ Check that burner flame covers electrode.
✓ If checks are okay, replace ignition module.
! NOTE : If module goes Into lockout, reset system.
Check continuity of sensor cable and ground wire.
NOTE : If ground is poor or erratic, shutdowns may occur occasionally
even though operation is normal at time of checkout.
Check that burner flame covers electrode.
NOTE : Temperature above lOOO'F (SSS^C) causes short to ground.
If checks are okay, replace ignition module.
Call for Heat Ends and
System Shuts Off?
✓ Check for proper temperature controller operation.
✓ Remove valve lead at module. If valve closes, recheck
temperature controller and wiring. If not, replace gas control.
-END TROUBLESHOOTING-
REPEAT PROCEDURE UNTIL TROUBLE-FREE OPERATION IS OBTAINED.
Form #43155010
Feb-04

30) MOTOR AND BLOWER WHEEL CHECK
If draft inducer motor fails to run: A)Checkpowersupplytojunction box. B)Checkfor loose or broken motor lead wire. C)
Check to see that blower wheel turns freely and is not rubbing housing. Blower wheel may have worked loose from shaft and
jammed against housing. D) Check for blower wheel damage; replace if necessary. If no damage, readjust blower wheel on
shaft & retighten set screw. E) If all above does not correct, replace motor.
31) CLEANING AND ANNUAL MAINTENANCE _
This heater must be cleaned and serviced annually before the start of each heating season and at any time excessive
accumulation of dust and dirt is observed. Maximum heating efficiency and clean combustion will be maintained by keeping
the heater clean. To clean the heater, follow these instructions: 1) Turn off all electrical and gas supply to the heater. 2)
Open the control box access panel. 3) Clean the access panel, the Inside of the control box, the emitter tube and the reflector
panels. (Dirty reflectors will reduce output.) 4) Visually inspect the spark electrode. Remove any foreign objects from
electrode tip. Set the spark gap to the proper value of 3/16”. ICAUTION : The ceramic portion of the electrode is very fragile
so any cleaning or adjustments must be done with care. 5) Disconnect the vent stack and remove any foreign material that
may have collected on the blower wheel. Make sure the blower wheel Is clean. A dirty wheel can reduce the volume of air
pulled and can result In premature tube failure.
REPLACING PARTS
INSTALLATION DATA
Ensure that at all times when parts are being replaced,
both gas and electrical supplies are disconnected.
Various parts are available from the factory for
replacement by a licensed person. Refer to the
Replacement Parts Guide in Section 34 for all
replacement parts.
Date of
Installation:_
Serial No._
Model: LTS or LTD
# of Heaters
in System:
N • Natural Gas
L - Propane Gas
34) REPLACEMENT PARTS GUIDE
DRAFT INDUCER COMPONENTS
DESCRIPTION
42917010 Draft Inducer Assembly
03723020 Blower Wheel
03977120 Plastic Vacuum Air Tube, 12” long
42739010 Blower Housing Sub-Assembly
42740000 Motor Plate
42742000 Sensing Tube Bracket
42744000 Sensing Tube, Draft Inducer
30347000 Motor Spacer (4 per motor)
03868010 3/8” Connector
30186072 Air Switch Kit, set @ 0.37” W.C., #824
30267000 y 2 ” Knockout Plug
30279000 Transformer, AT120B1051
30281000 Terminal Block, EK-204
30330000 Terminal Block, TFB-323
42709000 Terminal Block Shield r~
/TEA
30220010 Monitoring Light, Green ~
02175040 Strain Relief
42886000 Sensing Tube, Air Switch g.
42909000 Junction Box g.
42910000 Junction Box Cover g.
42911000 Junction Box Support Bracket 3 ,
42923000 SJO Cable Assembly 31
03721000 Motor, JB1R061N 3 ^
03979000 Braided Fiber Glass Sleeving, 4” Lg 3 ;
43221000 Draft Inducer Gasket 3 j
42874000 Connection Wire Diagram (not shown)
Restrictor Plates, see Inset -
42892000 Starting Collar, 4”x 6 ” (80M-175M Btu/hr)
40504020 Starting Collar, 4” (40M-75M Btu/hr)
) 0.37” W.C., #824
03721000
03979000
43221000
MODELS: LTS40-175 and LTU80-175
NOTES :
1) Screws, Nuts and Washers are standard hardware items
and can be purchased at any local hardware store.
2) Please order by PART NUMBER - not by item Number.
3) Replacement Part Prices are available when ordering.
4) Please refer to complete Model Number when ordering.
N - Natural Gas
L - Propane Gas
5 - Direct Spark Ignition of Main Burner
ALL ILLUSTRATION ARE INTENDED TO GIVE THE GENERAL
IMPRESSION OF UNITS ONLY. WE RESERVE THE RIGHTTO
ALTER ANY SPECIFICATION WITHOUT NOTICE.
42741040 Restrictor Plate, 1” I.D. (40M Btu/hr)
42741030 Restrictor Plate, 1-1/8’ l-D. (SOM Btu/hr)
42741020 Restrictor Plate, 1-7/32” I.D. (60M Btu/hr)
42741010 Restrictor Plate, 1-7/16” I.D. (75M Btu/hr)
42741050 Restrictor Plate, 1-1/2’ I.D. (SOM & 90M Btu/hr)
42741060 Restrictor Plate, 1-5/8” I.D. (lOOM Btu/hr)
42741070 Restrictor Plate, 1-3/4’ I.D. (IIOM & 120M Btu/hr)
42741080 Restrictor Plate, 1-7/8’ I.D. (125M & 130M Btu/hr)
42741090 Restrictor Plate, 2-1/32” I.D. (MOM & 150M Btu/hr)
42741100 Restrictor Plate, 2-1/4” I.D. (160M & 175M Btu/hr)
Form #43155010
Feb-04
-19-