Space-Ray LRDL15 Owner's manual

Form #44201117
Dec 2021
INSTALLATION AND OPERATION INSTRUCTIONS
Double Linear
OVERHEAD RADIANT TUBE HEATERS
Models:
LRDL15, LRDL25, LRDL30, LRDL35, LRDL40, LRDL45
Single Stage Pull Through System (Negative Pressure)
FOR YOUR SAFETY: If the heater is installed without a flue, exhaust fans MUST be operating on an appropriate
cycle when heaters are operating to avoid a high concentration of carbon monoxide. When used without fresh
air, this heater may give off carbon monoxide, an odorless and poisonous gas. CARBON MONOXIDE POISONING
MAY LEAD TO DEATH. Early signs of carbon monoxide poisoning resemble the flue with headaches, dizziness and
nausea. If you experience these signs, GET FRESH AIR IMMEDIATELY! Have the heaters serviced as soon as
possible and check the ventilation into the building.
!INSTALLER: This manual is the property of the owner. Please present this manual to the owner when you leave
the job site.
IF YOU SMELL GAS:
FOR YOUR SAFETY
!DO NOT try to light any appliance.
!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.
DO NOT store or use gasoline or other
flammable vapors and liquids in the vicinity of
this or any other appliance.
!IMPORTANT: SAVE THIS MANUAL FOR FUTURE REFERENCE.
Gas Fired Products (UK) Ltd.
Chapel Lane, Claydon, Ipswich, Suffolk IP6 0JL, England
Phone [phone] Fax: [phone] E-mail: [e-mail] www.spaceray.com.uk
OWNER /INSTALLER: For your safety this manual must be carefully and thoroughly read and understood before
installing, operating or servicing this heater. This heater is intended for use with either Natural Gas or Propane
Gas. It must be installed by a qualified service person or a licensed contractor in accordance with state and local
codes.
▲WARNING: 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. For assistance or additional information, consult a qualified installer, service agency or
the gas supplier.
INSPECT all combustion air openings into the building and, if necessary, clear if they become blocked.

Form #44201117
Dec 2021 -1-
TABLE OF CONTENTS
SECTION DESCRIPTION PAGE
1.0) SAFETY................................................................................................................................................. 2
2.0) INSTALLER RESPONSIBILITY............................................................................................................ 2
3.0) GENERAL INFORMATION................................................................................................................... 2
4.0) MINIMUM CLEARANCES TO COMBUSTIBLES................................................................................. 4
5.0) SPECIFICATIONS................................................................................................................................. 5
6.0) PACKING LIST ..................................................................................................................................... 7
7.0) DIMENSIONS –LINEAR TUBE CONFIGURATIONS.......................................................................... 9
7.1) HEATER ASSEMBLY OVERVIEW - LINEAR TUBE CONFIGURATIONS .........................................11
8.0) TYPICAL SUSPENSION METHODS ..................................................................................................17
8.1) BURNER BOX SUPPORT DETAILS ..................................................................................................18
8.2) FAN SUPPORT DETAILS...................................................................................................................19
8.3) USER INSTRUCTION LABEL.............................................................................................................19
9.0) TYPICAL HEATER ASSEMBLY .........................................................................................................19
9.1) TUBE COUPLING DETAILS ...............................................................................................................21
9.2) INSERTING TURBULATORS ............................................................................................................22
9.3) ATTACHING BURNER BOX ASSEMBLY ..........................................................................................24
9.4) ATTACHING FAN ASSEMBLY...........................................................................................................25
10.0) GAS CONNECTIONS AND REGULATIONS ......................................................................................26
11.0) INSTRUCTIONS FOR PRESSURE TEST GAUGE CONNECTION.....................................................28
12.0) ELECTRICAL CONNECTIONS............................................................................................................30
13.0) VENTING AND FRESH AIR FOR COMBUSTION .............................................................................32
14.0) HEATER OPERATION ........................................................................................................................35
14.1) SEQUENCE OF OPERATION .............................................................................................................35
14.2) LIGHTING AND SHUTDOWN INSTRUCTIONS ................................................................................35
15.0) CLEANING AND ANNUAL MAINTENANCE .....................................................................................36
16.0) TROUBLESHOOTING GUIDE.............................................................................................................38
17.0) REPLACING PARTS ..........................................................................................................................40
17.1) REMOVAL OF ELECTRODES ............................................................................................................40
17.2) REMOVING MAIN BURNER..............................................................................................................41
17.3) REMOVING INJECTOR ......................................................................................................................41
17.4) REMOVING IGNITION CONTROL .....................................................................................................42
17.5) REMOVING AIR SWITCH ..................................................................................................................42
17.6) REMOVING GAS VALVE AND MANIFOLD ASSEMBLY..................................................................43
17.7) REMOVING NEON INDICATOR ........................................................................................................43
17.8) REMOVING AIR INLET PLATE..........................................................................................................44
17.9) REMOVING THE FAN ........................................................................................................................44
18.0) CONVERSION INSTRUCTIONS.........................................................................................................45
19.0) INSTALLATION DATA........................................................................................................................45
20.0) REPLACEMENT PARTS GUIDE ........................................................................................................46
21.0) END OF LIFE DISPOSAL OF THIS APPLIANCE ..............................................................................50

Form #44201117
-2- Dec 2021
1.0) SAFETY
This heater is a self-contained infrared radiant tube heater. Safety information required during installation and
operation of this heater is provided in this manual and the labels on the product. The installation, service and
maintenance of this heater must be performed by a contractor qualified in the installation and service of gas
fired heating equipment.
All personnel in contact with the heater must read and understand all safety information, instructions and labels
before operation. The following symbols will be used in this manual to indicate important safety information.
Warning instructions must be followed to prevent or avoid hazards which
may cause serious injury, property damage or death.
Caution instructions must be followed to prevent incorrect operation or
installation of the heater which may cause minor injury or property
damage.
This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge unless they have been given supervision or instruction
concerning use of the appliance by a person responsible for their safety. Children should be supervised to ensure
that they do not play with the appliance.
2.0) INSTALLER RESPONSIBILITY
The installer is responsible for the following:
•The heater and venting, as well as electrical and gas supplies must be installed in accordance with these
installation instructions and any applicable codes and regulations.
•Every heater shall be located with respect to building construction and other equipment so as to permit
access to the heater.
•Each installer must follow the clearances to combustible materials for the heaters.
•Install the heater so that the supports and hangers are correctly spaced in accordance with these
instructions. The heater must be supported by materials having a working load limit of at least 52kg.
•Supply the owner with a copy of these Installation and Operation Instructions.
•Never use the heater as a support for a ladder or other access equipment. Do not hang anything from the
heater.
•Supply all installation materials necessary that are not included with the heater.
•Check the nameplate to make sure that the burner is correct for the gas type in the building.
•Install the heater in accordance with best building practices.
3.0) GENERAL INFORMATION
This heater is a self-contained infrared radiant tube heater designed for use where flammable gases or vapors
are not generally present.
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 the UK all equipment must be installed and maintained in
accordance with the relevant provisions of the Gas Safety (Installations and Use) Regulations 1998 for gas fired
products. Installation practices must take into account the Health and Safety at Works Act 1974 or relevant
codes of practice. In addition the installation must be carried out in accordance with the current IEE wiring
regulations (BS 7671-latest revision), BS 6896-latest revision (Industrial & Commercial) and any other relevant
British Standards and Codes of Practice by a qualified installer. All external wiring MUST comply with the current
IEE wiring regulations.
Clearances to combustibles as outlined in the manual should always be observed. In areas used for storage of
combustible materials where they may be stacked below the heater, 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 control housing. Each installer shall use skillful and reliable installation practices when locating the
heaters and must give consideration to service accessibility.

Form #44201117
Dec 2021 -3-
This heater is for NON-RESIDENTIAL INDOOR INSTALLATION ONLY and is used in 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
must be provided by gravity or mechanical means. Ventilation requirements are addressed further in these
instructions.
Before installation, check that the local distribution conditions, nature of gas and pressure, and adjustment of
the appliance are compatible.
Although these heaters may be used in many applications other than space heating (e.g., process heating),
Space-Ray will not recognize the warranty for any use other than space heating.
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.
Add text with regards to halogenated hydrocarbons.
Linear Configuration Series Only: Since linear configuration tube heaters are always hotter at the control end
than at the flue terminal end, always observe the minimum recommended mounting heights.
Fig. 1

Form #44201117
-4- Dec 2021
4.0) MINIMUM CLEARANCES TO COMBUSTIBLES
Minimum clearances to combustibles shall be measured from the outer surfaces as shown in the following
diagram:
Fig. 2
Table 1
MINIMUM CLEARANCES TO COMBUSTIBLES
Side
Above
Below
End
Front
Rear
LRDL15/25
510mm
450mm
1220mm
510mm
610mm
305mm
LRDL30/35/40/45
760mm
610mm
2285mm
610mm
760mm
380mm
▲WARNING: 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.
NOTE:
1. The clearances specified above must be maintained to combustibles and other materials that may be
damaged by temperatures 50ºC 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.
2. The stated clearance to combustibles represents a surface temperature of 50 ºC above room temperature.
Building materials with a low heat tolerance (such as plastics, vinyl siding, canvas, tri-ply, etc.) may be subject to
degradation at lower temperatures. It is the installer’s responsibility to assure that adjacent materials are
protected from degradation.
END END
ABOVE (CEILING) ABOVE (CEILING)
BELOW BELOW
SIDE SIDE FRONT
REAR

Form #44201117
Dec 2021 -5-
5.0) SPECIFICATIONS
Table 2
MODEL
LRDL15-N
LRDL15-L
Heat Input
2 x 15.0 kW Hs 13.5 kW Hi
Appliance Type (II2H3P)
A2, B22, C12, C32, C52
Appliance Category
II2H3P
Adjusted for
2H G20 20mbar
3P G31 37mbar
Setting Pressure
12.5mbar
25mbar
Injector
No. 31
Ø2.0mm
Burner Baffle Plate
PN 4260360Z
PN 4260360Z
Fan Air Restrictor Plate
PN 4260361C
PN 4260361C
Electrical Supply
230V~50Hz 125W
Fuse Externally
3A
Dimensions
LRDL15: 10.763m x 0.34m
Weight
LRDL15: 31kg
Gas Connection
R - ½
Flue Size
Ø150mm Note: Ø125 mm (5”) allowable
Table 3
MODEL
LRDL25-N
LRDL25-L
Heat Input
2 x 23.0 kW Hs 20.7 kW Hi
Appliance Type (II2H3P)
A2, B22, C12, C32, C52
Appliance Category
II2H3P
Adjusted for
2H G20 20mbar
3P G31 37mbar
Setting Pressure
12.5mbar
25mbar
Injector
Ø3.8mm
No. 39
Burner Baffle Plate
PN 4260360C
PN 4260360C
Fan Air Restrictor Plate
PN 42603618D
PN 42603618D
Electrical Supply
230V~50Hz 125W
Fuse Externally
3A
Dimensions
LRDL25: 19.802m x 0.34m
Weight
LRDL25: 92kg
Gas Connection
R - ½
Flue Size
Ø150mm
Table 4
MODEL
LRDL30-N
LRDL30-L
Heat Input
2 x 29.2 kW Hs 26.3 kW Hi
Appliance Type (II2H3P)
A2, B22, C12, C32, C52
Appliance Category
II2H3P
Adjusted for
2H G20 20mbar
3P G31 37mbar
Setting Pressure
12.5mbar
25mbar
Injector
No. 19
No. 34
Burner Baffle Plate
PN 4260360D
PN 4260360D
Fan Air Restrictor Plate
PN 42603618D
PN 42603618D
Electrical Supply
230V~50Hz 125W
Fuse Externally
3A
Dimensions
LRDL30: 19.802m x 0.34m
LRDL30: 25.948m x 0.34m (with 3m extension)
Weight
LRDL30: 124kg
LRDL30: 158kg (with 3m extension)
Gas Connection
R - ½
Flue Size
Ø150mm

Form #44201117
-6- Dec 2021
Table 5
MODEL
LRDL35-N
LRDL35-L
Heat Input
2 x 34.5 kW Hs 31.1 kW Hi
Appliance Type (II2H3P)
A2, B22, C12, C32, C52
Appliance Category
II2H3P
Adjusted for
2H G20 20mbar
3P G31 37mbar
Setting Pressure
12.5mbar
25mbar
Injector
No. 15
Ø3.1mm
Burner Baffle Plate
PN 42760360E
PN 42760360E
Fan Air Restrictor Plate
PN 42603618G
PN 42603618G
Electrical Supply
230V~50Hz 125W
Fuse Externally
3A
Dimensions
LRDL35: 19.802m x 0.34m
LRDL30: 25.948m x 0.34m (with 3m extension)
Weight
LRDL35: 124kg
LRDL30: 158kg (with 3m extension)
Gas Connection
R - ½
Flue Size
Ø150mm
Table 6
MODEL
LRDL40-N
LRDL40-L
Heat Input
2 x 42.2kW Hs 38.0kW Hi
Appliance Type (II2H3P)
A2, B22, C12, C32, C52
Appliance Category
II2H3P
Adjusted for
2H G20 20mbar
3P G31 37mbar
Setting Pressure
12.5mbar
25mbar
Injector
Ø 5.0mm
Ø 3.3mm
Burner Baffle Plate
PN 4260360S
PN 4260360S
Fan Air Restrictor Plate
PN 42603618G
PN 42603618G
Electrical Supply
230V~50Hz 230W
Fuse Externally
3A
Dimensions
LRDL40: 25.948m x 0.34m
LRDL40: 32m x 0.34m (with 3m extension)
Weight
LRDL40: 158kg
LRDL40: 192kg (with 3m extension)
Gas Connection
R - ½
Flue Size
Ø150mm
Table 7
MODEL
LRDL45-N
LRDL45-L
Heat Input
2 x 47.0 kW Hs 42.3 kW Hi
Appliance Type (II2H3P)
A2, B22, C12, C32, C52
Appliance Category
II2H3P
Adjusted for
2H G20 20mbar
3P G31 37mbar
Setting Pressure
12.5mbar
25mbar
Injector
Ø 5.4mm
No. 28
Burner Baffle Plate
PN 4260360H
PN 4260360H
Fan Air Restrictor Plate
None
None
Electrical Supply
230V~50Hz 230W
Fuse Externally
3A
Dimensions
LRDL45: 25.948m x 0.34m
LRDL45: 32m x 0.34m (with 3m extension)
Weight
LRDL45: 158kg
LRDL45: 192kg (with 3m extension)
Gas Connection
R - ½
Flue Size
Ø150mm

Form #44201117
Dec 2021 -7-
Table 8 Flue Data
Model
Flue Gas
Mass Flow
Rate (kg/s)
Flue
Pressure (Pa)
Flue Gas
Temperature
(°C)
LRDL 15
LRDL 15
N
L
0.0171
0.0171
10-12
10-12
135-185
135-185
LRDL
25
N
0.0256
12-15
135-185
LRDL
25
L
0.0251
12-15
135-185
LRDL
30
N
0.0305
15-20
120-170
LRDL
30
L
0.0294
15-20
120-170
LRDL
35
N
0.0380
17-22
190-240
LRDL
35
L
0.0374
17-22
190-240
LRDL
40
N
0.0439
22-28
160-210
LRDL
40
L
0.0478
22-28
160-210
LRDL
45
N
0.0547
25-35
225-275
LRDL
45
L
0.0577
25-35
225-275
6.0) PACKING LIST
6.1 LRDL15/25
The appliances are supplied as follows:-
Table 9
REF
PART NO.
MODEL
LRDL15
LRDL25
Carton (containing the following)
1
1
Fastenings Pack
1
1
1
Burner Box Assembly
2
2
2
44438050
Fan –#DSF133-042 –(Ø 76.2)
1
-
2a
44438520
Fan –#DSA524-202 –(Ø 76.2)
-
1
3
43318000
Hanger Brackets
6
8
3a
42770000
U-Bolt (included in fastenings pack)
6
8
4
30462990
Torctite Coupling
5
7
5
42766000
Radiant Tube (Ø 76.2 x 4572)
2
4
6
43319100
Reflector Panel (3035 long)
2
6
6a
43319050
Reflector Panel (1511 long)
2
-
7
43320000
Reflector End Panel
4
4
8
44152248
Turbulator (65mm x 572mm)
0
8
9
44534030
Tee Section - (Ø 76.2)
1
1
10
42679279
Hanger Clamp - (Ø 76.2)
1
1
11
02326010
M10 Eyebolt
1
1
LRDL15, 25 Fig. 3

Form #44201117
-8- Dec 2021
6.2 LRDL30/35
LRDL40/45
The appliances are supplied as follows:-
Table 10
REF
PART NO.
MODEL
LRDL30
LRDL35
LRDL40
LRDL45
Carton (containing the following)
1
1
1
1
Fastenings Pack
1
1
1
1
1
Burner Box Assembly
2
2
2
2
2
44438530
Fan –#DSA-524-202 –(Ø 101.6)
1
-
-
-
2a
44438540
Fan –#DSA-524-202 –(Ø 101.6)
-
1
-
-
2b
44438270
Fan - #DSA-524-202 -(Ø 101.6)
-
-
1
-
2c
44438260
Fan - #DSA-524-202 -(Ø 101.6)
-
-
-
1
3
43318000
Hanger Brackets
8
8
10
10
3a
42873000
U-Bolt (included in fastenings
pack)
8
8
10
10
4
30462980
Torctite Coupling
9
9
11
11
5
41932100
Radiant Tube (Ø 101.6 x 3048)
6
6
8
8
6
44152240
Turbulator (90mm x 610mm)
18
10
6
-
7
43319100
Reflector Panel (3035 long)
6
6
8
8
8
43320000
Reflector End Panel
4
4
4
4
9
44534040
Tee Section - (Ø 101.6)
1
1
1
1
10
42679289
Hanger Clamp - (Ø 101.6)
1
1
1
1
11
02326010
M10 Eyebolt
1
1
1
1
WITH OPTIONAL 3m tube extension length
REF
PART NO.
MODEL
LRDL30
LRDL35
LRDL40
LRDL45
Carton (containing the following)
1
1
1
1
Fastenings Pack
1
1
1
1
1
Burner Box Assembly
2
2
2
2
2
44438530
Fan –#DSA-524-202 –(Ø 101.6)
1
-
-
-
2a
44438540
Fan –#DSA-524-202 –(Ø 101.6)
-
1
-
-
2b
44438270
Fan - #DSA-524-202 -(Ø 101.6)
-
-
1
-
2c
44438260
Fan - #DSA-524-202 -(Ø 101.6)
-
-
-
1
3
43318000
Hanger Brackets
10
10
12
12
3a
42873000
U-Bolt (included in fastenings
pack)
10
10
12
12
4
30462980
Torctite Coupling
11
11
13
13
5
41932100
Radiant Tube (Ø 101.6 x 3048)
8
8
10
10
6
44152240
Turbulator (90mm x 610mm)
18
10
6
-
7
43319100
Reflector Panel (3035 long)
8
8
10
10
8
43320000
Reflector End Panel
4
4
4
4
9
44534040
Tee Section - (Ø 101.6)
1
1
1
1
10
42679289
Hanger Clamp - (Ø 101.6)
1
1
1
1
11
02326010
M10 Eyebolt
1
1
1
1
LRDL30, 35, 40, 45 Fig. 4

Form #44201117
Dec 2021 -9-
7.0) DIMENSIONS –LINEAR TUBE CONFIGURATIONS
Fig. 5

Form #44201117
-10- Dec 2021
Fig. 5a
LRDL30/35/40/45 with OPTIONAL 3m EXTENSION

Form #44201117
Dec 2021 -11-
7.1) HEATER ASSEMBLY OVERVIEW - LINEAR TUBE CONFIGURATIONS
Fig. 6

Form #44201117
-12- Dec 2021
Fig. 6a

Form #44201117
Dec 2021 -13-
Fig. 7

Form #44201117
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Fig. 7a

Form #44201117
Dec 2021 -15-
Fig. 8

Form #44201117
-16- Dec 2021
Fig. 8a

Form #44201117
Dec 2021 -17-
8.0) TYPICAL SUSPENSION METHODS
Not with standing their limited scope, the appliance should be installed in accordance with the relevant
provisions of any National Gas Safety (Installation and Use) Regulations. Due account should also be taken of
any obligations arising from any National Health and Safety at Work Regulations, National and Local Building
Regulations and National Electrical Wiring Regulations. The appliance must be installed, and where necessary,
converted for use on other gases, by a qualified installer.
Various means of suspending the heater can be used. See the following drawings for typical examples.
a. Use only noncombustible materials for suspending hangers and brackets.
b. Linear Tube Heaters should be suspended to provide a slope of 0.25 degree up to the fan (25 to 50mm). The
appliance should be located with respect to building construction and other equipment to permit access to
the appliance for servicing etc.
c. Turnbuckles can be used with chains to allow leveling of the heater. All “S” hooks and eye bolts must be
manually crimped closed by the installer.
d. For suspending the appliance it is recommended that suitable protected welded chain (Ø 3mm x 65 links
per m) or Ø 8mm min mild steel drop rods and suitable brackets are used. Attach the chains or drop rods to
the hanger brackets where shown providing at least Ø 5mm closed link hooks are used chains may be
attached directly to the hanger brackets.
e. Heaters subject to vibration must be provided with vibration isolating hangers.
f. Heaters must not be supported by gas or electric supply lines and must be suspended from a permanent
structure with adequate load capacity.
g. Hanging points are fixed along the length of heater to accommodate trim pieces. Secondary steel work may
be required to span between supporting beams.
h. The appliance should be located with respect to building construction and other equipment to permit access
to the appliance for servicing etc.
Space-Ray recommends that the body sections be suspended using chains with turnbuckles. This will allow slight
adjustments after assembly and heater expansion/ contraction during operation.
If a “trapeze” method is used for tube support/hanger brackets (shown below), the minimum chain length for the
two connecting chains is 914 mm to minimize any vibration that might be generated by the draft inducer
assembly. If these chains must be less than 914 mm, then do not use the trapeze method and, instead, use
individual chains on each tube support/hanger bracket.

Form #44201117
-18- Dec 2021
Fig. 9
8.1) BURNER BOX SUPPORT DETAILS
1. The burner box must be supported with welded chain (Ø 3mm x 65 links per m) or Ø 8mm min mild steel
drop rods and suitable brackets after overall heater suspension is complete. This is to prevent burner from
sagging which may cause the tube to burn out. Assemble bracket and turnbuckle to inlet end of burner as
shown.
Fig. 10
2. Adjust the turnbuckle until control box is level. Use a leveling device to verify.

Form #44201117
Dec 2021 -19-
8.2) FAN SUPPORT DETAILS
1. The fan assembly must be supported with suitable welded chain chain (Ø 3mm x 65 links per m) or
Ø 8mm min mild steel drop rods and suitable brackets after overall heater suspension is complete.
2. Attach the tube hanger clamp (split ring) to the branch outlet of the tee section as shown. Attach the
chains or drop rods to the M10 eyebolt of the tube hanger clamp.
Fig. 11
8.3) USER INSTRUCTION LABEL
The User Instruction label shown below is supplied with each heater. Affix this label adjacent to low level user
controls, such as thermostats, time clocks or control panels.
Fig. 12
9.0) TYPICAL HEATER ASSEMBLY