Roberts Gorden Combat 150 Service manual

FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. DO NOT try to light any appliance.
3. DO NOT use electrical switches.
4. DO NOT use any telephone in
your building.
5. Leave the building.
6. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
7. If you cannot reach your gas
supplier, call the Fire Department.
WARNING
Combat
®
Tubular Unit Heaters
Installation, Commissioning,
Operation & Service Manual
Model CTU
22 to 115
Fire Hazard
Do not store or use petrol or other
flammable vapours and liquids in the
vicinity of this or any other appliance.
Some objects will catch fire or explode
when placed close to heater.
Failure to follow these instructions can
result in death, injury or property
damage.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can result in death, injury or property
damage. Read the installation, operation and service
manual thoroughly before installing or servicing
this equipment.
Installation must be done by a registered installer/
contractor qualified in the installation and service
of gas-fired heating equipment or your gas supplier.
Quality in Any Language™
© 2008 Roberts-Gordon LLC
Installer
Please take the time to read and understand
these instructions prior to any installation.
Installer must give a copy of this manual to the owner.
Owner
Keep this manual in a safe place in order to provide
your serviceman with necessary information.
Roberts-Gordon Europe Limited
Unit A, Kings Hill Business Park
Darlaston Road, Wednesbury
West Midlands WS10 7SH UK
Telephone: +44(0)121 506 7700
Fax: +44 (0)121 506 7701
Service Telephone: +44 (0)121 506 7709
Service Fax: +44 (0)121 506 7702
E-mail: uksales@rg-inc.com
E-mail: export@rg-inc.com
www.rg-inc.com
P/N X407UK Rev H 07/08
TABLE OF CONTENTS
SECTION 1: Heater Safety...................................................... 2
SECTION 2: Installer Responsibility ..................................... 2
2.1 Clearances to Combustibles ........................................ 2
2.2 Corrosive Chemicals.................................................... 2
2.3 National Standards and Applicable Codes .................. 2
SECTION 3: Critical Considerations ..................................... 3
3.1 Basic Information ......................................................... 3
3.2 Location and Suspension ............................................ 3
3.3 Minimum Required Installation Clearances ................. 3
3.4 Clearances to Combustibles ........................................ 3
3.5 Ventilation .................................................................... 3
3.6 Gas Supply .................................................................. 3
3.7 Electrical Supply .......................................................... 3
3.8 Flue.............................................................................. 3
SECTION 4: Specifications .................................................... 5
4.1 CTUA .......................................................................... 5
4.2 CTUB, CTUC and CTUD ............................................. 6
4.3 General Technical Data Table ..................................... 7
4.4 Technical Data Table.................................................... 8
SECTION 5: Heater Installation.............................................. 9
5.1 General ........................................................................ 9
5.2 Handling ...................................................................... 9
5.3 Shelf Mounting and Suspension .................................. 9
SECTION 6: Flue Installation ............................................... 10
6.1 Flue Installation.......................................................... 10
6.2 Type C12, C32 & C62 Appliance .................................... 10
6.3 Type B22 Appliance..................................................... 10
SECTION 7: Air Supply......................................................... 12
7.1 Room Sealed Installation ........................................... 12
7.2 Open Flued Installation .............................................. 12
7.3 Building Ventilation ..................................................... 12
7.4 Isolated Equipment Rooms ........................................ 12
SECTION 8: Optional Heater Configurations...................... 13
8.1 Distribution Duct Work for CTUB, CTUC
and CTUD Heaters .................................................... 13
SECTION 9: Gas Piping ........................................................ 14
9.1 Connections............................................................... 14
SECTION 10: Wiring and Electrical Information................. 15
10.1 Electrical Supply ...................................................... 15
10.2 Remote Controls ...................................................... 15
10.3 CTUA Wiring Diagram (Models 22-60) .................... 16
10.4 CTUA Wiring Diagram (Models 75-115)................... 17
10.5 CTUB/C Wiring Diagram (Models 22-40)................. 18
10.6 CTUB/C Wiring Diagram (Models 50-60)................. 19
10.7 CTUB/C Wiring Diagram (Models 75-115) ............... 20
10.8 CTUD Wiring Diagram (Models 22-60) .................... 21
10.9 CTUD Wiring Diagram (Models 75-115)................... 22
10.10 CTUD External Motor Alternative Wiring
& Optional Thermostat/Time Switch ....................... 23
SECTION 11: Commissioning .............................................. 24
11.1 Pre-Commission Checks .......................................... 24
11.2 Gas Supply ............................................................... 24
11.3 Mechanical Checks................................................... 24
11.4 Begin Commissioning ............................................... 24
11.5 Combustion Testing .................................................. 26
11.6 Turning Off the Heater .............................................. 26
11.7 External Controls ...................................................... 27
11.8 Complete the Commissioning................................... 27
11.9 Instruction to the User .............................................. 27
SECTION 12: User Instructions............................................28
12.1 User Instructions ......................................................28
12.2 Heater Operation......................................................28
12.3 Common User Controls............................................28
12.4 Lighting Instructions .................................................28
12.5 Simple Fault Finding.................................................29
SECTION 13: Servicing.........................................................30
13.1 Servicing Instructions...............................................30
13.2 Burner Maintenance.................................................30
13.3 Fan/Motor Assembly Maintenance ...........................30
13.4 Heat Exchanger Maintenance ..................................30
13.5 Gas Control Valve Maintenance ...............................30
13.6 Flue Fan ...................................................................30
SECTION 14: Conversion Between Gases ..........................31
14.1 General ....................................................................31
14.2 Burner Conversion ...................................................31
14.3 Gas Valves ...............................................................31
SECTION 15: Troubleshooting .............................................32
15.1 General ....................................................................32
15.2 Troubleshooting For Automatic Ignition
Burner Systems .......................................................33
15.3 Troubleshooting for Flame Supervision System .......34
15.4 Troubleshooting for Solenoid Valves ........................34
SECTION 16: Removal and Replacement Parts..................35
16.1 Gas Valve .................................................................35
16.2 Burner Compartment ...............................................36
16.3 Ignition Electrode and Flame Probe .........................37
16.4 Flue Fan ...................................................................38
16.5 Pressure Switch........................................................39
16.6 Ignition Control .........................................................40
16.7 CTUA Axial Fan/Guard/Motor Assembly ..................40
16.8 CTUB & CTUC Centrifugal Fan/Guard/Motor
Assembly .................................................................40
16.9 Fan Data...................................................................41
© 2008 Roberts-Gordon LLC
All rights reserved. No part of this work covered by the copyrights herein may be reproduced
or copied in any form or by any means - graphic, electronic, or mechanical, including
photocopying, recording, taping or information storage and retrieval systems - without the
written permission of Roberts-Gordon LLC.
Printed in U.K.
TABLE OF FIGURES
Figure 1: Installation Clearances and Clearances to
Combustibles............................................................. 4
Figure 2: Suspension Methods ................................................. 9
Figure 3: Flue and Roof Detail ................................................ 10
Figure 4: Air Intake Terminal Cover......................................... 10
Figure 5: Vertical and Horizontal Flue Termination Type B22 Appliance ................................................... 11
Figure 6: Vertical and Horizontal Flue Termination Type C12 C32 & C62 Appliances ................................. 11
Figure 7: Heaters Installed in Isolated Equipment Rooms ...... 12
Figure 8: Ducting..................................................................... 13
Figure 9: Gas Connection with Stainless Steel
Flex Connector ........................................................ 14
Figure 10: Automatic Burner Control Box Sequence............... 25
Figure 11: Gas Valve for Heater (Models 22 - 60) ................... 25
Figure 12: Gas Valve for Heater (Models 75 - 115) ................. 26
Figure 13: Heater Operating Sequence .................................. 28
Figure 14: Centrifugal Fan Orientation .................................... 41
Product Approval
ROBERTS GORDON® appliances have been tested and CE certified as complying with the essential
requirements of the Gas Appliance Directive, the Low Voltage Directive, the Electromagnetic
Compatibility Directive and the Machinery Directive for use on natural gas and LPG when installed,
commissioned and maintained in accordance with these instructions.
These instructions refer to appliances designed to operate in the European Union.
Appliances designed for other countries (Non-European Union) are available on request.
This appliance must be installed in accordance with the local and national codes in force and used
only in a sufficiently ventilated space, as specified in these instructions.
Before installation, check that the local gas distribution systems, nature of gas and pressure, and
adjustment of the appliance are compatible.
1
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 1: HEATER SAFETY
Your Safety is Important to Us!
This symbol is used throughout the
manual to notify you of possible fire,
electrical or burn hazards. Please pay
special attention when reading and
following the warnings in these sections.
Installation, service and annual inspection of heater
must be done by a registered installer/contractor
qualified in the installation and service of gas-fired
heating equipment.
Read this manual carefully before installation,
operation, or service of this equipment.
This heater is designed for heating non-residential
indoor spaces. Do not install in residential spaces.
These instructions, the layout drawing, local codes
and ordinances, and applicable standards that apply
to gas piping, electrical wiring, venting, etc. must be
thoroughly understood before proceeding with the
installation.
SECTION 2: INSTALLER RESPONSIBILITY
• To install the heater, as well as the gas and electrical supplies, in accordance with applicable
specifications and codes. Roberts-Gordon
recommends the installer contact a local
building inspector, Fire Officer or insurance
company for guidance.
• To use the information given in the manual
together with the local and national codes to
perform the installation.
• To install the heater in accordance with the
Clearances to Combustibles of this heater.
• To furnish all needed materials not furnished
as standard equipment.
• To plan location of supports, flues and air
intakes.
• To provide access to burners for servicing.
• To provide the owner with a copy of this
Installation, Commissioning, Operation and
Service Manual.
• To never use heater as support for ladder or
other access equipment and never hang or
suspend anything from heater.
• To ensure that there is sufficient ventilation in the
area to comply with the requirements of
all relevant local and national codes.
2.1 Clearances to Combustibles
In all situations, clearances to combustibles must be
maintained. Caution must be used when running the
heater near combustible materials such as wood,
paper, rubber, etc. A wall tag (P/N 91040028) is on
the back cover of this manual as a permanent
reminder of the safety instructions and the
importance of the required clearances to
combustibles. Affix the tag on a wall near the heater.
2
2.2 Corrosive Chemicals
CAUTION
Do not use heater in an area containing corrosive
chemicals.
Corrosive chemicals will damage the burner and
heat exchanger parts.
Failure to follow these instructions can result in
property damage.
Roberts-Gordon cannot be responsible for ensuring
that all appropriate safety measures are undertaken
prior to installation; this is entirely the responsibility
of the installer. It is essential that the contractor, the
sub-contractor, or the owner identifies the presence
of combustible materials, corrosive chemicals or
halogenated hydrocarbons* anywhere in the
premises.
* Halogenated Hydrocarbons are a family of chemical
compounds characterized by the presence of halogen
elements (fluorine, chlorine, bromine, etc.). These compounds are frequently used in refrigerants, cleaning
agents, solvents, etc. If these compounds enter the air
supply of the burner, the lifespan of the heater components will be greatly reduced. Warranty will be invalid if
the heater is exposed to halogenated hydrocarbons.
2.3 National Standards and Applicable Codes
All appliances must be installed in accordance with
the latest revision of applicable standards and local
and national codes. This refers also to the electric,
gas and venting installation. Note: Additional
standards for installations in public garages, aircraft
hangars, etc. may be applicable.
SECTION 3: CRITICAL CONSIDERATIONS
SECTION 3: CRITICAL CONSIDERATIONS
3.1 Basic Information
CTU heaters have automatic ignition burners for
ON/OFF operation only.
3.2 Location and Suspension
All models:
• Must be installed indoors.
• Must be installed in a level position.
• May be mounted on a shelf of non-combustible
material. (See Page 5, Section 4 and Page 9,
Figure 2 for support points)
• May be suspended from above (See Page 9,
Figure 2) or from wall brackets of sufficient
strength to support the heater as listed in the
Dimension Data Table on Page 5, Section 4.1.
Drop rods must be a minimum of 10 mm diameter mild steel. Four suspension points (M10 nuts)
are located on top of the heater.
• Must be installed in a manner which allows the
hinged door to be fully opened to provide access
to all serviceable components.
3.8 Flue
Choose heater siting to allow for the proper location
of the flue. Each heater must be fitted with an
individual and correctly sized sealed flue system
(See Page 10, Section 6).
No other appliance may be connected to the flue.
For room sealed installation, the air intake must be
the same size sealed system and the flue/air intake
must terminate at an approved concentric wall or
roof terminal.
3.3 Minimum Required Installation Clearances
Clearances around the heater and flue must be as
indicated on Page 4, Figure 1, Page 10, Figure 3
through Page 11, Figure 6 to ensure access for
servicing, and correct operation.
3.4 Clearances to Combustibles
Clearances must be as indicated on Page 4, Figure
1. If clearances to combustibles are not indicated,
then installation clearances apply.
3.5 Ventilation
It is important to ensure that there is adequate air
circulation around the heater to supply air for
combustion, ventilation and distribution in
accordance with local and national codes.
3.6 Gas Supply
It is important that the gas supply pipe is sized
correctly to provide the inlet pressure as stated on
the heater data plate. The gas supply pipe and
electrical connections must not support any of the
heater's weight.
3.7 Electrical Supply
A permanent 230 V 50 Hz electrical supply is
required at the main electrical terminals. The heater
also requires suitable energy controls in accordance
with Section 10.
3
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
WARNING
Fire Hazard
Some objects will catch fire or explode when placed
close to heater.
Keep all flammable objects, liquids and vapours the
required distance away from the heater.
Failure to follow these instructions can result in death,
injury or property damage.
Figure 1: Installation Clearances and Clearances to Combustibles
Clearances to Combustibles
Installation Clearances
Roof Terminal
Air
Intake
Wall
Terminal
15 cm
15 cm
3m
Flue
50 cm
60 cm
50 cm**
30 cm
2.5 - 3.5 m*
* Heaters may be mounted at a higher level if
destratification fans and/or turn down nozzles are
installed.
**80 cm is necessary to service heater.
The heater must always be installed at least 2.5 m above the floor.
The flue pipe must have clearance from combustibles by 5 cm.
If installed at low levels where individuals can come in contact with hot heat exchanger components,
adequate guarding must be provided.
All distances are minimum clearance requirements for service access, air flow and safety.
4
SECTION 4: SPECIFICATIONS
SECTION 4: SPECIFICATIONS
4.1 CTUA
Top View
Heater must be supported
at these points from above
or below.
E
C
D
77
4 x M10 Captive Nuts Provided
Support
Centers 492
End View
J
646
Rear View
Z
Air Intake
F
G
H
B
Flue
Lockout Reset
Gas
Supply
Electrical
Cable Entry
168
A
Dimension Data - CTUA (All Models)
A
Width
B
Height
C
Support Spacing
D
Support Spacing
E
Support Spacing
F
Centre of Flue
G
Centre of Flue/Air Intake
H
Position of Flue
J
Gas Inlet Position
Z
Length
Flue/Air Intake Pipe Size
Weight
Model
22
30
35
40
50
60
75
90
100
115
mm
(in)
mm
(in)
mm
(in)
mm
(in)
mm
(in)
mm
(in)
mm
(in)
mm
(in)
mm
(in)
mm
(in)
mm Ø
(in) Ø
1075
(42.3)
610
(24)
450
(17.7)
312
(12.3)
315
(12.4)
240
(9.5)
140
(5.5)
218
(8.6)
150
(5.9)
756
(29.8)
100
(3.9)
1075
(42.3)
610
(24)
450
(17.7)
312
(12.3)
315
(12.4)
240
(9.5)
140
(5.5)
218
(8.6)
150
(5.9)
756
(29.8)
100
(3.9)
1075
(42.3)
610
(24)
450
(17.7)
312
(12.3)
315
(12.4)
240
(9.5)
140
(5.5)
218
(8.6)
150
(5.9)
756
(29.8)
100
(3.9)
1075
(42.3)
610
(24)
450
(17.7)
312
(12.3)
315
(12.4)
240
(9.5)
140
(5.5)
218
(8.6)
150
(5.9)
756
(29.8)
100
(3.9)
1075
(42.3)
895
(35.2)
450
(17.7)
312
(12.3)
315
(12.4)
430
(16.9)
140
(5.5)
211
(8.3)
150
(5.9)
806
(31.8)
100
(3.9)
1075
(42.3)
895
(35.2)
450
(17.7)
312
(12.3)
315
(12.4)
430
(16.9)
140
(5.5)
211
(8.3)
150
(5.9)
806
(31.8)
100
(3.9)
1327
(52.3)
1100
(43.3)
627
(24.7)
312
(12.3)
388
(15.3)
346
(13.6)
225
(8.9)
260
(10.2)
220
(8.7)
756
(29.8)
1327
(52.3)
1100
(43.3)
627
(24.7)
312
(12.3)
388
(15.3)
346
(13.6)
225
(8.9)
260
(10.2)
220
(8.7)
756
(29.8)
1327
(52.3)
1345
(53)
627
(24.7)
312
(12.3)
388
(15.3)
537
(21.1)
225
(8.9)
260
(10.2)
220
(8.7)
806
(31.8)
1327
(52.3)
1345
(53)
627
(24.7)
312
(12.3)
388
(15.3)
537
(21.1)
225
(8.9)
260
(10.2)
220
(8.7)
806
(31.8)
130
(5.1)
130
(5.1)
130
(5.1)
130
(5.1)
kg
84
84
88
92
115
122
160
169
194
203
5
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
4.2 CTUB, CTUC and CTUD
1440
K
115
L
679
646
M
N
N
End View
End View
CTUB/C (All Models)
CTUC (All Models)
115
115
646
N
P
N
End View
Front View
CTUD (And other models fitted with air outlet spigots)
CTUD (All Models)
Dimension Data - CTUB, CTUC and CTUD
Model
22
30
35
40
50
60
75
90
100
115
mm
(in)
mm
(in)
mm
(in)
mm
(in)
1026
(40.4)
1026
(40.4)
1026
(40.4)
1026
(40.4)
1026
(40.4)
1026
(40.4)
1076
(42.4)
1076
(42.4)
1076
(42.4)
1076
(42.4)
610
(24)
610
(24)
610
(24)
610
(24)
610
(24)
610
(24)
610
(24)
610
(24)
895
(35.2)
895
(35.2)
895
(35.2)
895
(35.2)
1100
(43.3)
1100
(43.3)
1100
(43.3)
1100
(43.3)
1380
(54.3)
1431
(56.3)
1380
(54.3)
1431
(56.3)
534
(21)
534
(21)
534
(21)
534
(21)
817
(32)
817
(32)
1024
(40.3)
1024
(40.3)
1233
(48.5)
1233
(48.5)
mm
(in)
709
(27.9)
709
(27.9)
709
(27.9)
709
(27.9)
707
(27.8)
707
(27.8)
888
(35)
888
(35)
888
(35)
888
(35)
Weight CTUB
kg
96
96
100
104
139
146
185
210
228
237
Weight CTUC
kg
109
109
113
117
157
163
206
215
251
260
Weight CTUD
kg
93
93
97
101
124
131
172
181
200
209
K
CTUB Depth
L
CTUB Height
M
CTUC Height
N
Inlet & Outlet Duct
Spigot Height
Inlet & Outlet Duct
Spigot Width
P
NOTE: Inlet and outlet duct spigot fitted with 30 mm flange.
6
SECTION 4: SPECIFICATIONS
4.3 General Technical Data Table
Model CTU-22 CTU-30 CTU-35 CTU-40 CTU-50 CTU-60 CTU-75 CTU-90 CTU-100 CTU-115
CTUA With Axial Fan
Total Electrical Load
W
210
210
210
210
415
415
510
510
745
745
Run Current
A
1.0
1.0
1.0
1.0
1.72
1.72
1.9
1.9
3.2
3.2
Start Current
A
1.4
1.4
1.4
1.4
2.4
2.4
2.8
2.8
4.5
4.5
Air Flow
m3/h
3800
4000
4000
4000
5500
5500
7500
7500
11,000
11,000
Sound Pressure Level [NR]
at 3 m
dB(A)
[51]
56
[51]
56
[51]
56
[51]
56
[52.1]
57.1
[52.1]
57.1
[52.3]
57.3
[52.3]
57.3
[52.3]
57.3
[52.3]
57.3
CTUB with Centrifugal Fan and CTUC Range with Centrifugal Fan and Duct Inlet
Total Electrical Load
W
550
550
550
550
1100
1100
1100
1100
1650
1650
Normal Run Current
A
4.6
4.6
4.6
4.6
11.0
11.0
11.0
11.0
15.6
15.6
Normal Start Current
A
9.0
9.0
9.0
9.0
13.5
13.5
13.5
13.5
19.2
19.2
Normal Speed
Medium Medium Medium Medium Medium Medium Medium Medium Medium Medium
High Run Current
A
5.5
5.5
5.5
5.5
14.0
14.0
14.0
14.0
21.0
21.0
High Start Current
A
13.6
13.6
13.6
13.6
17.2
17.2
17.2
17.2
25.8
25.8
Air Flow
m /h
3300
3300
3300
3300
5500
5500
6400
6400
9400
9400
Sound Pressure Level [NR]
at 3 m
dB(A)
[59]
59.5
[59]
59.5
[59]
59.5
[59]
59.5
[61]
61.5
[61]
61.5
[62]
61.8
[62]
61.8
[63]
64.2
[63]
64.2
3
CTUD Duct Heater with No Fan
**Minimun Air Flow
Required
m3/h
3300
3300
3300
3300
5500
5500
6400
6400
9400
9400
Pressure Loss Across
Heat Exchanger
Pa
30
30
30
30
30
30
30
30
30
30
Flue and Air Intake
Size
mm Ø
100
100
100
100
100
100
130
130
130
130
*Maximum Straight
Flue/Air Intake
m
7
8
8
10
13
15
15
17
20
20
Flue and AIr Intake
Electrical load at 230 V 50 Hz measured by calculating from total run current of appliance.
* Do not exceed the maximum length of flue stated or heater may not operate properly. Reduce the
maximum length stated by 1 m for each 90° bend installed.
**If minimum air flow requirements are not met, then temperature limit devices will shut down the heater.
7
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
4.4 Technical Data Table
Appliance Category II 2H/L 3B/P
Model
CTU-22 CTU-30 CTU-35 CTU-40 CTU-50 CTU-60 CTU-75 CTU-90 CTU-100 CTU-115
Heat Input
Gross CV
kW
(Btu/h) x (1000)
27
93
33
113
39
133
48
163
61
210
70
238
95
324
111
378
119
405
134
459
Heat Input
Net CV
kW
(Btu/h) x (1000)
25
84
30
102
35
119
43
147
55
189
63
215
86
292
100
341
107
365
121
414
Approximate
Heat Output
kW
(Btu/h) x (1000)
23
78
27
92
32
109
39
133
51
174
58
198
78
266
91
310
98
334
111
379
75
75
75
75
75
75
75
75
75
75
Thermostat Limit Thermodisc
CTUA,B/C,D
°C
Natural Gas (G20) Data - Inlet Pressure 20 mbar (7.8 in WG) Min. 17 mbar (6.8 in WG) Max. 25 mbar (10 in WG)
Burner Pressure
mbar
8.3
8.7
8.5
9.4
9.3
8.5
6.1
6.0
6.2
6.3
Gas Rate
m3/h
ft3/h
2.6
92
3.2
112
3.7
131
4.5
160
5.8
206
6.6
234
9.0
319
10.5
371
11.3
398
12.8
451
Natural Gas (G25) Data - Inlet Pressure 25 mbar (10 in WG) Min. 20 mbar (7.8 in WG) Max. 30 mbar (12 in WG)
Burner Pressure
mbar
12.2
12.7
12.5
14.0
13.6
13.2
9.2
9.3
9.2
10.2
Gas Rate
m3/h
ft3/h
3.03
107
3.33
117
4.31
152
4.78
169
6.14
217
6.98
247
9.49
335
11.06
391
11.86
419
13.43
474
LPG Gas Propane (G31) Data - Inlet Pressure 37 mbar (14.6 WG) Min. 25 mbar (10 in WG) Max. 45 mbar (18 in WG)
Alternative where permitted 50 mbar (20 in WG) Min. 42.5 bar (17 in WG) Max. 57.5 mbar (23 in WG)
Burner Pressure
mbar
26.6
24.9
25.4
25.9
25.6
26.8
25.6
27.3
25.3
25.9
Gas Rate
m /h
kg3/h
liquid/h
1.01
1.87
3.7
1.23
2.28
4.5
1.48
2.75
5.4
1.77
3.27
6.4
2.27
4.21
8.3
2.58
4.79
9.4
3.51
6.50
12.8
4.09
7.58
14.9
4.39
8.13
16.0
4.97
9.21
18.1
3
LPG Gas Butane (G30) Data - Inlet Pressure 29 mbar (11,4 in WG) Min. 20 mbar (7.8 in WG) Max. 35 mbar (13.8 WG)
Burner Pressure
mbar
18.9
17.4
17.8
19.5
18.4
19.0
18.3
19.4
18.3
18.7
Gas Rate
m3/h
kg3/h
liquid/h
0.76
1.86
3.2
0.93
2.27
4.0
1.06
2.59
4.5
1.34
3.26
5.7
1.72
4.19
7.3
1.95
4.77
8.3
2.65
6.47
11.3
3.09
7.55
13.2
3.32
8.09
14.1
3.75
9.17
16.0
Gas rates corrected to standard conditions 1013.25 mbar 15° C.
8
SECTION 5: HEATER INSTALLATION
SECTION 5: HEATER INSTALLATION
5.1 General
Heaters are designed for installation above 2.5 m.
These heaters must be installed within the heated
space. Duct delivery systems are not permitted with
axial fans.
5.2 Handling
All CTU heaters are supplied secured to a wooden
pallet and shrink wrapped. Use the pallet to support
the heater during handling and installation. When
handling or supporting the heater from below,
ensure that the weight is taken at the support points.
5.3 Shelf Mounting and Suspension
WARNING
Crush Hazard
Use 10 mm steel drop rod
minimum.
Failure of the supports can
result in death, injury
or property damage.
For typical suspension See Page 9, Figure 2.
Figure 2: Suspension Methods
Unistrut
Channel Nut
Insure all suspension hardware
is torqued to a minimum
of 27 Nm (20 ft lbs)
Washer
Nut
10 mm
Steel
Drop Rod
Cone Point
Set Pin
Window
Clamp
10 mm
Steel
Drop Rod
Unistrut
Nut
Washer
Riv
Nut
Support Points
9
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 6: FLUE INSTALLATION
6.1 Flue Installation
Figure 3: Flue and Roof Detail
WARNING
Flue
Terminal
Masterflash
Soaker Flashing
or Rain Collar.
Fire Hazard
Some objects will catch fire or explode when placed
close to heater.
Keep all flammable objects, liquids and vapours the
required distance away from the heater.
Failure to follow these instructions can result in death,
injury or property damage.
The flue must terminate outside of the building.
Flues and air intakes must be a fully sealed system
and correctly sized for the model. Flues should be
assembled as detailed on Page 10, Figure 3 through
Page 11, Figure 6. The joints between the flue
terminal and the roof or wall must be properly
sealed. If the flue passes through a wall or ceiling of
combustible material, it must be enclosed by a
sleeve of non-combustible material and be
separated from the sleeve by at least a 25 mm air
gap.
Flues and air intakes must be adequately
supported so that the heater does not bear the
weight of the pipes.
For flue termination See Page 10, Figure 3 through
Page 11, Figure 6.
6.2 Type C12, C32 & C62 Appliance
Room Sealed.
The heaters are designed to be installed as room
sealed appliances. The flue and air intake are run as
separate pipes to the special concentric wall or roof
terminal. See Page 11, Figure 6.
6.3 Type B22 Appliance
The flue must terminate outside the building and be
fitted with a low resistance terminal.
See Page 10, Figure 3 through Page 11, Figure 5.
6.3.1 Air Intake Terminal Cover
For Type B22 appliance installations, an air intake
terminal cover is an available option. The cover is
scored flat sheet metal that must be bent into shape.
See Page 10, Figure 4. Remove and retain the
screws for the air inlet spigot. Use these screws to
attach the cover in position over the spigot.
Roof
Metal Sleeve
25 mm Air Gap to
Combustible Material
Flue
Figure 4: Air Intake Terminal Cover
Fold Leg
Down
Fold Foot
Out
Fold Leg
Down
Fold Foot
Out
Description
Part Number
Air Intake Terminal Cover (100mm)
F078A
Air Intake Terminal Cover (130mm)
F077A
10
SECTION 6: FLUE INSTALLATION
Figure 5: Vertical and Horizontal Flue Termination - Type B22 Appliance
Roof Terminal
Masterflash
Metal Sleeve
(25 mm air gap to
Combustible Material)
Flue
Air Intake
Terminal Cover
Vertical
Option
90°
Bend
Masterflash
Flue
Horizontal
Option
Wall
Terminal
Figure 6: Vertical and Horizontal Flue Termination - Type C12 C32 & C62 Appliances
Roof Terminal
Plastic Cup
Masterflash
Model
Concentric Flue Diameter
22-60 Cover (100mm)
150mm
75-115 Cover (130mm)
200mm
Manifold
Air Intake
Flue
Vertical
Option
Wall
Terminal
90° Bend
Wall
Plate
End View
Air Intake
Flue
Horizontal
Option
Manifold
Max wall thickness
335 mm
The minimum
gap must be
positioned at bottom
11
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 7: AIR SUPPLY
7.1 Room Sealed Installation
When installed as a room sealed heater, the air for
combustion is drawn in from outside the building. It
is important to ensure that there is adequate
ventilation to provide air for the distribution fan/s.
7.2 Open Flued Installation
It is important to ensure that there is adequate air
supply at all times for both combustion and heating
requirements in accordance with local and national
codes. When installed in this mode, the air supply to
the heater must also be fitted with a low resistance
terminal to prevent the ingress of debris. See Page
11, Figure 5.
7.2.1 Heaters Installed Within the Heated Space
Where the volume of the heated space is greater
than 4.7 m3 per kilowatt of total rated heat input and
the air change rate is at least 0.5/h, additional high
and low level ventilation will not be required.
For a building having an air change rate less than
0.5/h, ventilation will be necessary in accordance
with local and national codes. Ventilation direct to
outside must be provided as follows:
• Heaters up to 70 kW heat input: 5.0 cm2 per kW
of rated heat input
• Heaters above 70 kW heat input: 350 cm2 + 2.5
cm2 per kW of rated heat input above 70 kW
7.3 Building Ventilation
Where ventilation is required, air must be taken from
an outside point where it is not likely to be
contaminated or obstructed.
Where natural ventilation is used, suitable ventilation
with outside air at low level must be provided in
accordance with Section 7.2.1 and local and national
codes.
Where mechanical ventilation is used, extract rate
must be 5% - 10% less than the inlet rate. The
mechanical ventilation must be interlocked with the
burner on the CTU heater.
7.4 Isolated Equipment Rooms
Ventilation must prevent the isolated equipment
room temperature from exceeding 32° C as well as
prevent any negative air pressure within the room.
See Page 12, Figure 7. Any isolated equipment
room containing air heaters will require permanent
air vents direct to outside air in compliance with local
codes.
Where natural ventilation is used, suitable
permanent openings at low and high level,
communicating directly with the outside air, must be
provided.
Where mechanical ventilation is used, extract rate
must be 5% - 10% less than the inlet rate. The
mechanical ventilation must be interlocked with the
burner on the CTU heater.
Figure 7: Heaters Installed in Isolated Equipment Rooms
High Level
Ventilation
Manifold
Air Intake
Duct Distribution
System or
Discharge to
Heated Space
Max Temperature 32° C
Room Air Pressure Must Not be Negative.
Wall
12
Flue
Return Air Duct
from Heated
Space or Fresh
Air from Outside
Low Level
Ventilation
Outside
Wall
SECTION 8: OPTIONAL HEATER CONFIGURATIONS
SECTION 8: OPTIONAL HEATER CONFIGURATIONS
8.1 Distribution Duct Work for CTUB, CTUC and 8.1.1 CTUD Heaters
CTUD Heaters
For CTUD heaters, it is essential that the airflow in
the duct system is at least that specified in the Data
CTUC heaters have the fans enclosed so that the
Sheet on Page 6, Section 4.2 and in the correct
heater may be connected to inlet ducting.
CTUD heaters are supplied with inlet and outlet duct direction across the heat exchanger as indicated by
the arrow on the heater. Higher air flows are
spigots for mounting the heater into a customer
permitted, but will cause a lower exiting air
designed duct system for use with an external fan
temperature. It is recommended that the fan is
system.
It is recommended that flexible duct connectors are positioned to blow the air through the heat
exchanger.
used to reduce duct born noises.
The duct must be designed as described on Page
When installing CTUD heaters onto ducting force
13, Section 8.1 and Figure 8 to ensure that there is a
the fan to run.
homogenous air flow across the whole of the heat
Do not rely on the fan thermostat to turn it on.
exchanger.
Any such device must be in parallel with the fan
Failure to provide a suitable air flow properly
thermostat so that the fan run-on operation will still
distributed across the heat exchanger will reduce the
operate.
life of the heat exchanger.
The fan motor, or its control, must contain a method
Contact Roberts-Gordon Europe Ltd. Design
of overload protection. When installed remote from
Department for recommendations regarding
the heater, the fan must be supplied via a local
duct resistance and design. Tel: +44 (0) 121 506 electrical isolator positioned and properly labeled to
7700
prevent inadvertent operation.
Figure 8: Ducting
NOTE: Duct size will be full size of inlet and outlet.
All joints between the heater and duct work should be
made as air tight as possible.
Dimension
“X”
MinimumTwice
Dimension
“X”
Airflow Indicator
MinimumTwice
Dimension
“X”
Ducting
Flexible Flange
Ducting
13
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 9: GAS PIPING
WARNING
Fire Hazard
Connect gas supply according to Figure 9.
Gas can leak if not installed properly.
Failure to follow these instructions can result in
death, injury or property damage.
It is important that the gas supply pipe and the
electrical connections do not support any of the
heater’s weight.
A gas meter is connected to the service pipe by the
gas supply company. An existing meter should be
checked, preferably by the company, to ensure that
the meter is adequate for the rate of gas supply
required.
Installation pipes must be fitted in accordance with
local and national codes. Pipe work from the meter
to the heater(s) must be of adequate size. Pipes of
smaller size than the heater inlet gas connection
should not be used.
9.1 Connections
Connect the heater to the gas supply ensuring that
the final connections are as follows:
• Gas supply pipe work is run in medium or heavy
gauge tubing in compliance with local and
national codes.
• The gas supply pipe is adequately sized to carry
the total volume of gas for the complete
installation.
• An isolating valve and union connection should
be used and fitted into the supply adjacent to the
heater.
• For suspended heaters, use an approved metal
flexible connection between the isolating valve
and the heater. To reduce pressure loss, use
one pipe size larger than the heater gas
connection.
IMPORTANT - The complete installation must be
purged and tested for gas soundness in accordance
with local and national codes.
Figure 9: Gas Connection with Stainless Steel Flex Connector
• Hold gas nipple securely
with pipe wrench when
attaching the flex gas
connector.
Option A:
Stainless Steel
Flex Gas
Connector
• Do not twist flexible
gas connector.
• Ensure all joints are
gas tight.
Do not bend flexible
gas connector sharply.
Gas Isolating Valve
Option B:
Medium or Heavy
Gauge Tubing
Gas Connector
Drip Leg
Union
Connection
14
Cap
SECTION 10: WIRING AND ELECTRICAL INFORMATION
SECTION 10: WIRING AND ELECTRICAL INFORMATION
10.2.1 Burner Controls (Thermostat)
10.1 Electrical Supply
Controls to operate the burner must be voltage free
All heaters need a constant 230 V 50 Hz single
contacts connected between terminals 2 & 3 of the
phase supply connected to terminals L, N & Earth.
main terminal block.
Polarity "L & N" must be correct. The voltage
between neutral and earth should be 0 and never
10.2.2 Positioning Room Thermostats or
exceed 15 volts.
ROBERTS GORDON® Control
All heaters and controls must be correctly earthed.
A room thermostat or ROBERTS GORDON®
All external wiring must comply with the relevant
control should be mounted on a wall or column at a
height of approximately 1.5 metres from the floor to
local codes. Wire specification H05VV-F.
measure the ambient temperature. It should be
External controls must have the same constant
clear of both cold draughts and the direct path of
230 V 50 Hz supply.
warm air from the heater.
An isolator with a contact separation of at least
3 mm on all poles must be installed adjacent to, but
not attached to, the heater to disconnect all supplies
to the heater and any remote control.
The final connection to the heater should be made
by flexible cable or conduit to the main terminal
block on the inside of the heater using 1 mm2 cable
on all models.
Models
............................................ Fuse Size
CTUA (All Models) ........................................... 5 A
CTUB & CTUC (Models 22-50)...................... 10 A
CTUB & CTUC (Models 75 - 115) .................. 20 A
10.2.3 Remote Frost Thermostat
When required, connect to terminals 2 and 3 in the
main terminal block.
Locate within the heated space adjacent to the most
vulnerable equipment that requires protection.
See Page 16, Section 10.3 through Page 17, Section
10.4.
10.2.4 Remote Fan Controls
The fan will operate automatically providing there is
a constant 230 V supply to the main terminals.
A switch or control wired between terminals L & 1 in
the terminal block will allow external control of the
fan(s).
The fan may be controlled to operate continuously
from an external control, with the burner cycling on
and off, providing that the fan run-on at close down
is not impaired.
CTUD heaters must have the external fan, or its
control connected to Terminal 1 so that the fan runon function at close down operates correctly.
WARNING
Electrical Shock Hazard
Disconnect electrical power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
10.2 Remote Controls
The heater is designed to be operated by controls
installed remote from the heater. See Page 16,
Section 10.3. through Page 17, Section 10.4.
15
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
10.3 CTUA Wiring Diagram (Models 22-60)
IGNITION MODULE
12
11
10
9
8
7
6
5
4
3
2
1
Time Delay Relay
BLUE
BLACK
BROWN
PINK
PURPLE
GREY
BLUE
BROWN
YELLOW
BROWN
WHITE
BROWN
Thermostat Limit
Thermodisc N/C
BROWN
E
RUN
N
L
RED
RED
COMBUSTION
FAN
N
L
BROWN
Pressure Switch
Detail
LOCKOUT
RESET
GREEN/YELLOW
BLUE
WHITE
WHITE
YELLOW
BLACK
NC\P(2)
GREEN/YELLOW
NO\P(3) YELLOW
C\P(1)
PRESSURE SWITCH
E
BLACK
AXIAL FAN
BROWN
GAS VALVE
BLUE
BLUE
BROWN
MAINS FILTER
LOCKOUT
SITE WIRING
N
L
1
2
BLACK
IGNITION
BLACK
Honeywell
S4565C 1017 Control
NOTE:
If any of the original wire supplied with
the heater must be replaced, it must be
replaced with wiring material having a
temperature rating of at least 105° C
and 600 volts.
16
NEUTRAL
LINE
REMOTE FAN ON
THERMOSTAT
SENSE
GROUND
Plug in Connection to Gas Valve
230 V
1Ø
50 Hz
3
7
8
REMOTE LOCKOUT INDICATION
REMOTE LOCKOUT RESET
IGNITION MODULE
SECTION 10: WIRING AND ELECTRICAL INFORMATION
10.4 CTUA Wiring Diagram (Models 75-115)
NOTE:
If any of the original wire supplied with
the heater must be replaced, it must be
replaced with wiring material having a
temperature rating of at least 105° C
and 600 volts.
17
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
10.5 CTUB/C Wiring Diagram (Models 22-40)
IGNITION MODULE
10
9
8
7
6
5
4
3
2
1
Time Delay Relay
BLACK
BROWN
PINK
PURPLE
GREY
11
BLUE
BROWN
YELLOW
BROWN
WHITE
12
BLUE
BROWN
Thermostat Limit
Thermodisc N/C
NC\P(2)
WHITE
Pressure Switch
Detail
CENTRIFUGAL
FAN
GREEN/YELLOW
WHITE N
HIGH BLACK
MEDIUM BLUE
LOCKOUT
RESET
LOW RED
E
RUN
N
L
COMBUSTION
FAN
C\P(1)
WHITE
YELLOW
BLACK
NO\P(3) YELLOW
GREEN/YELLOW
BLACK
PRESSURE SWITCH
GAS VALVE
BLUE
BLUE
BROWN
MAINS FILTER
LOCKOUT
SITE WIRING
N
L
1
2
BLACK
IGNITION
BLACK
Honeywell
S4565C 1017 Control
NOTE:
Unused speed setting wires for the
centrifugal fan must be isolated and
insulated. If any of the original wire
supplied with the heater must be
replaced, it must be replaced with
wiring material having a temperature
rating of at least 105° C and 600 volts.
18
NEUTRAL
LINE
REMOTE FAN ON
THERMOSTAT
SENSE
GROUND
Plug in Connection to Gas Valve
230 V
1Ø
50 Hz
3
7
8
REMOTE LOCKOUT INDICATION
REMOTE LOCKOUT RESET
IGNITION MODULE
RED
RED
BROWN
BROWN
SECTION 10: WIRING AND ELECTRICAL INFORMATION
10.6 CTUB/C Wiring Diagram (Models 50-60)
IGNITION MODULE
10
9
8
7
6
5
4
3
2
1
BLACK
BROWN
PINK
PURPLE
GREY
11
BLUE
BROWN
YELLOW
BROWN
WHITE
12
Time Delay Relay
BLUE
BROWN
BROWN
Thermostat Limit
Thermodisc N/C
GAS VALVE
CENTRIFUGAL FAN 2
WHITE
Pressure Switch
Detail
RUN
E
N
L
BROWN
RED
RED
LOW RED
LOCKOUT
RESET
GREEN/YELLOW
WHITE N
HIGH BLACK
MEDIUM BLUE
LOW RED
COMBUSTION
FAN
NC\P(2)
WHITE
YELLOW
BLACK
NO\P(3) YELLOW
C\P(1)
GREEN/YELLOW
BLACK
PRESSURE SWITCH
GREEN/YELLOW
WHITE N
HIGH BLACK
MEDIUM BLUE
A
4
B
7
5
CENTRIFUGAL FAN 1
6
8
9
RELAY
BLUE
BLUE
BROWN
MAINS FILTER
LOCKOUT
SITE WIRING
N
L
1
2
BLACK
IGNITION
BLACK
Honeywell
S4565C 1017 Control
NOTE:
Unused speed setting wires for the
centrifugal fan must be isolated and
insulated. If any of the original wire
supplied with the heater must be
replaced, it must be replaced with
wiring material having a temperature
rating of at least 105° C and 600 volts.
NEUTRAL
LINE
REMOTE FAN ON
THERMOSTAT
SENSE
GROUND
Plug in Connection to Gas Valve
3
7
8
REMOTE LOCKOUT INDICATION
REMOTE LOCKOUT RESET
IGNITION MODULE
230 V
1Ø
50 Hz
19
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
10.7 CTUB/C Wiring Diagram (Models 75-115)
NOTE:
Unused speed setting wires for the
centrifugal fan must be isolated and
insulated. If any of the original wire
supplied with the heater must be
replaced, it must be replaced with
wiring material having a temperature
rating of at least 105° C and 600 volts.
20
SECTION 10: WIRING AND ELECTRICAL INFORMATION
10.8 CTUD Wiring Diagram (Models 22-60)
IGNITION MODULE
10
9
8
7
6
5
4
3
2
1
BLACK
BROWN
PINK
PURPLE
GREY
11
BLUE
BROWN
YELLOW
BROWN
WHITE
12
Time Delay Relay
BLUE
BROWN
BROWN
Thermostat Limit
Thermodisc N/C
NC\P(2)
WHITE
Pressure Switch
Detail
BROWN
RED
RED
LOCKOUT
RESET
E
RUN
N
L
COMBUSTION
FAN
C\P(1)
WHITE
YELLOW
BLACK
NO\P(3) YELLOW
GREEN/YELLOW
BLACK
PRESSURE SWITCH
GAS VALVE
BLUE
BLUE
BROWN
MAINS FILTER
LOCKOUT
SITE WIRING
N
L
1
2
BLACK
IGNITION
Honeywell
S4565C 1017 Control
NOTE:
For external fan wiring,
See Page 23, Section 10.10.
THERMOSTAT
BLACK
NEUTRAL
LINE
SENSE
GROUND
Plug in Connection to Gas Valve
3
7
8
REMOTE LOCKOUT INDICATION
REMOTE LOCKOUT RESET
IGNITION MODULE
230 V
1Ø
50 Hz
If any of the original wire supplied with the
heater must be replaced, it must be replaced
with wiring material having a temperature
rating of at least 105° C and 600 volts.
21
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
10.9 CTUD Wiring Diagram (Models 75-115)
NOTE:
For external fan wiring,
See Page 23, Section 10.10.
If any of the original wire supplied with the
heater must be replaced, it must be replaced
with wiring material having a temperature
rating of at least 105° C and 600 volts.
22
SECTION 10: WIRING AND ELECTRICAL INFORMATION
10.10 CTUD External Motor Alternative Wiring & Optional Thermostat/Time Switch
Three Phase Motor
Single Phase Motor
with Load over 7 Amps
N L 1 2 3
N L 1 2 3
Room
Thermostat
Room
Thermostat
2A
2A
Frost
Thermostat
Frost
Thermostat
230 V 50 Hz
Time Switch
230 V
Contactor or Relay
230 V 50 Hz
Time Switch
230v
Contactor or Relay
Single Phase Motor
with Load Over 7 Amps
N
L
230 V 50 Hz
supply
400 V 3 Ø
motor
Overload protection must
be provided at the motor
or contactor.
RDW 1565
Overload protection must
be provided at the motor
or contactor.
N L1 L2 L3
400 V 50 Hz
3 Ø Supply
23
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 11: COMMISSIONING
Installation, service, commissioning and annual
inspection of the heater must be done by a
contractor qualified in the installation and service of
gas-fired heating equipment. Read this manual
carefully before installation, commissioning,
operation, or service of this equipment. All
components are accessed via the hinged door
secured by a ¼ turn latch. Opening the door
exposes live electrical connections and hot
components.
WARNING
Electrical Shock Hazard
Use extreme caution while commissioning.
Failure to follow these instructions can result in
death or electrical shock.
11.1 Pre-Commission Checks
All pre-commission checks must be carried out
before lighting the heater.
Ensure that the heater and all controls are suitable
for the gas, pressure and electrical supply to which
they are to be connected.
11.1.1 Louvres
Where fitted, the air delivery louvres need to be set
during commissioning to give the required air
distribution.
WARNING
Cut Hazard
Turn off gas and electrical supply before maintenance.
Fan can start automatically at any time.
Failure to follow these instructions can result in severe
injury or product damage.
24
11.1.2 Electrical Checks
All pre-commission checks must be carried out
before commissioning the heater.
1. Check that all site wiring is connected in
accordance with the appropriate wiring diagrams on Page 16, Section 10.3 through Page
23, Section 10.10.
2. Check the correct fuse size is fitted;
See Page 15, Section 10.1.
11.2 Gas Supply
All aspects of the gas installation including the gas
meter must be inspected, tested for soundness and
purged in accordance with local and national codes.
Ensure that the air is fully purged from the heater
inlet pipe up to the main gas valve inlet test nipple.
11.3 Mechanical Checks
1. Check that the fan(s) are free to run and
delivery louvres are turned to give required air
deflection.
2. Check that the flue (and air intake for room
sealed) is installed in accordance with these
instructions and local regulations.
3. The thermostat limit thermodisc is preset and
sealed at the factory and is not adjustable.
11.4 Begin Commissioning
11.4.1 Before Operating the Heater
To ensure that all the controls are in safe working
order, operate the heater for the first time with the
isolating gas valve turned off.
1. Turn off the gas isolating valve
2. Using the installed external control, turn on the
burner. The automatic sequence will now begin
as described on Page 25, Figure 10.
There will be no ignition of the burner and lockout
will occur, which proves the controls are operating
correctly.
SECTION 11: COMMISSIONING
Figure 10: Automatic Burner Control Box Sequence
Burner sequence for Honeywell S4563 or S4565C
START
RUN
CLOSE
DOWN
Supply 230 V
Flue Fan
Pressure Switch P NO
C
30 Sec. Purge*
NC
ts**
Ignition Spark
Start Gas Valve
Flame Signal
Required Incoming Signals
Signals Output By Control
*Purge time begins at pressure switch change over.
**ts=Safety time (S4563C=3 seconds [alternate 5 seconds]; S4565C=5 seconds)
If at any stage the flame fails, the control will go to "lockout". The red light will illuminate and the
control will need to be manually reset before any further start attempt can be made.
Figure 11: Gas Valve for Heater (Models 22 - 60)
End View
Fixing Screw
Ignition Control
(Plugs into Gas Valve)
Ignition
Output
Flame
Probe
Connection
Regulator
(Under Cover)
12 Cable Connector
Outlet Pressure
Inlet Pressure
Gas Inlet
25
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
Figure 12: Gas Valve for Heater (Models 75 - 115)
Plug for
Main Gas Valve
Regulator
(Under Cover)
Plug for
Main Safety
Gas Valve
Inlet Pressure
Gas Inlet
Outlet Pressure
11.4.2 Commissioning the Gas Valves (all gases)
11.4.2.1 Check Burner Gas Pressure
1. Loosen the screw cover of the outlet (burner)
pressure test point and connect a manometer.
2. With the burner firing, measure the pressure on
the manometer. To adjust the burner pressure,
remove the regulator cover from the valve and
turn the regulator adjustment screw to set the
required burner pressure as stated in the Technical Data Tables for the correct gas and model
on Page 8, Section 4.4.
Gas Outlet
11.5 Combustion Testing
The only adjustment to alter combustion
performance is burner pressure. Combustion quality
must be tested to prove correct heater operation.
Incorrect results will indicate faults with the
installation or appliance.
NOTE: If the correct burner pressure cannot be
reached, then check the inlet pressure to the valve,
with the burner firing. See Technical Data Tables on
Page 8, Section 4.4 for inlet pressure requirement.
Combustion testing must be carried out with all
covers in place. The flue gas is sampled in the flue,
within 1 meter of the heater. The values of CO2
should be between 6.5% to 8.0% for natural gas and
7.0% to 9.1% for LPG dependant upon model.
The CO will be up to 80 ppm (0.008%) dry, air free
dependant upon model. Temperature rise of the flue
gases above ambient should be approximately
160° C to 180° C. Seal test hole in flue after testing.
Do not continue to adjust the regulator if the
pressure is not changing.
Pressure Switch:The pressure switch is factory preset for each model and is not adjustable.
If the inlet pressure is too low to allow correct burner
pressure setting, then the gas inlet pressure must
be corrected before completing the commission.
11.6 Turning Off the Heater
Set the external controls to the off position and the
main burner will stop.
The fans will run until they are stopped
automatically by the fan thermostat.
Do not use electrical isolator for control of
heater. Electrical isolator will switch off the fan.
Heat exchanger could be damaged. Warranty
will not cover damage to the heat exchanger if
operated improperly.
Check Gas Rate
1. After burner pressure adjustment, allow the
heater to operate for at least 15 minutes and
then re-check settings.
2. Remove the manometer and refit all covers to
the valve and tighten the screw of the outlet
pressure tap.
3. Check gas flow rate at gas meter.
26
SECTION 11: COMMISSIONING
11.7 External Controls
External controls may include time switch, room
thermostat and frost thermostat. Operate each
control to ensure that they function correctly. Set the
time switch (if fitted) and room thermostat to the
users’ requirements.
11.8 Complete the Commissioning
Ensure that all covers are fitted correctly and all test
points are properly sealed.
11.9 Instruction to the User
Explain the controls of the heater to the user
including how to turn it on and off, using the controls
fitted on site.
Give this manual to the user.
Ensure that the user is shown and understands the
importance of maintaining clearances to
combustibles and the user instructions on Page 28,
Section 12 through Page 29, Section 12.5 and all
warnings defined in this manual.
27
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 12: USER INSTRUCTIONS
12.1 User Instructions
The CTU heaters are fully automatic and operate
from the external controls fitted on site.
The only user controls at the heater are the:
Burner Lockout Reset Button:
See Page 28, Section 12.3.2
Thermostat Limit Thermodisc Reset Button:
See Page 28, Section 12.3.1
WARNING
12.3 Common User Controls
12.3.1 Thermostat Limit Thermodisc
Press to reset
These are hand reset devices to give further
protection against fan failure.
NOTE: To reset, the heat exchanger must be cool.
Description
All Models
Part Number
90412100
Electrical Shock Hazard
Disconnect electrical power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
12.2 Heater Operation
When the heater has been switched on by the
remote controls installed on site, the main burner
will automatically turn on.
The burner control box will control the safe ignition
of the flame.
All heaters require a constant gas and electricity
supply which must not be interrupted during the
normal operation of this heater.
Figure 13: Heater Operating Sequence
ON
THERMOSTAT
CALL FOR
HEAT
BURNER
RUN
FAN
28
CLOSE
DOWN
Explosion Hazard
If control locks out, do not make more than 3
attempts to restart the heater.
Dangerous fuel mixtures can build up.
The fault must be traced and repaired by a
registered installer or service engineer.
Failure to follow these instructions can result in
death, injury or property damage.
12.3.2 Burner Lockout Reset Button
The red warning light at the front of the heater will
illuminate when the control has gone to lockout.
This may be caused by flame failure. Press the
reset button on the back of the heater, (See Page 5,
Section 4.1), or the remote reset if installed on site.
ON
12.4 Lighting Instructions
ON
2-3 MINUTES
RUN ON
12.4.1 To Turn On Heater
1. Ensure that the electrical and gas supplies to
the heater are on. Check that the on site
controls are “ON”.
NOTE: The thermostat setting must be above the
ambient temperature for the heater to operate.
2. The green light will be on and the automatic
firing sequence will begin as described on
Page 25, Figure 10. The heater will now
operate automatically under the control of the
on site controls. Following long shut down
periods, the control may go to lockout. See
Page 28, Section 12.3.2.
SECTION 12: USER INSTRUCTIONS
12.4.2 To Turn the Heater Off
Set the installed remote controls to the “OFF”
position.
The burner will turn off immediately.
The fan will continue to run for a few minutes.
To restart, turn the control used above to “ON”.
12.5 Simple Fault Finding
Some possible reasons for the heater not operating
are:
1. Gas supply not turned “ON”.
2. Electricity supply not turned “ON”.
3. The time and/or temperature controls are not
“ON”.
4. The thermostat limit thermodisc may have
operated. This may be caused by an interruption of the electrical supply or failure of the
distribution fan.
If the thermostat limit thermodisc persistently
operates, there is a fault which must be investigated
by a contractor qualified in the installation and
service of gas-fired heating equipment.
12.5.1 Simple Fault Finding (Burner Faults)
If the burner fails to ignite for any reason, it will go to
lockout. This will be indicated by the red light on the
heater or at the remote indicator (if fitted).
1. Press in and release the lockout reset button. If
a remote reset is not fitted, a reset button is on
the rear panel of the heater.
See Page 5, Section 4.1.
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. DO NOT try to light any appliance.
3. DO NOT use electrical switches.
4. DO NOT use any telephone in
your building.
5. Leave the building.
6. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
7. If you cannot reach your gas
supplier, call the Fire Department.
WARNING
Fire Hazard
Do not store or use petrol or other
flammable vapours and liquids in the
vicinity of this or any other appliance.
Some objects will catch fire or explode
when placed close to heater.
Failure to follow these instructions can
result in death, injury or property
damage.
Lockout should not occur during normal operation of
the heater and indicates there is a fault condition
which must be corrected.
29
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 13: SERVICING
13.1 Servicing Instructions
After commissioning, the heater will require
maintenance to be carried out annually. If the heater
is used in a dirty or dusty area, more frequent
maintenance may be necessary.
Installation, service and annual inspection of
heater must be done by a contractor qualified
in the installation and service of gas-fired heating
equipment.
WARNING
Cut Hazard
Turn off gas and electrical supply before maintenance.
Fan can start automatically at any time.
Failure to follow these instructions can result in severe
injury or product damage.
NOTE 1: After any maintenance or repair work
always test fire the heater in accordance with the
commissioning instructions on Page 24, Section 11
through Page 27, Section 11.9 to ensure all safety
systems are in working order before leaving the
heater to operate. Minor faults may be traced by
using the troubleshooting charts on Page 32,
Section 15 through Page 34, Section 15.4.
NOTE 2: Check all gas pipes and pipe joints to
ensure there are no cracks or gas leaks. Any cracks
in the pipes or pipe joints must be repaired.
NOTE 3: Inspect all suspended components and
hardware. Insure that they are in good condition,
properly tightened, and corrosion free.
13.2 Burner Maintenance
1. Open the hinged door and remove the burner
compartment cover. See Page 36, Section
16.2.
2. Clean any deposits from the main burner which
may have formed in the injectors or venturi of
the burner. See Page 36, Section 16.2.
3. Remove the ignition electrode and flame probe.
Check condition of ignition electrode and flame
probe. Clean off any deposits which may have
been formed, check condition of ceramic
insulators. Replace as necessary.
30
13.3 Fan/Motor Assembly Maintenance
The main fan bearings are permanently sealed and
do not need lubrication. Before cleaning, turn off gas
and electrical supply. Remove the fan(s) and use a
small brush or duster to clean the fan blades from
each side. Replace fan(s) when done.
13.3.1 For CTUB & CTUC Centrifugal Fan
Models
CTUB and CTUC models are fitted with thermally
protected three speed fans. The number of fans can
be found on Page 41, Section 16.9 and the standard
air flow for each model can be found on Page 7,
Section 4.3.
For CTUC models, the fans may be accessed via
the removable panels in the top, bottom and sides of
the inlet spigot compartment as required.
Do not operate at higher speeds than the original
setting on the heater without prior consultation with
Roberts-Gordon.
The "HIGH" speed option is available to give the
normal required air flow against higher static
pressures and is not intended to be operated free
blowing or against low resistance. Use of the fans
under these conditions may cause the fan thermal
overload to operate and the fan thermostat to cycle.
All fans on a heater must be set to operate at the
same speed. For Models 50 - 115, they will be
switched using a fan relay built into the heater. See
Page 40, Section 16.8.2.
13.4 Heat Exchanger Maintenance
The heat exchanger will remain clean unless a
problem has developed with combustion. Inspect
the heat exchanger. Look for signs of overheating at
the front tubes which may indicate burner over firing
or persistently low air flows.
13.5 Gas Control Valve Maintenance
No regular maintenance is required on these
devices. To change gas control valves, See Page
35, Step 16.1 and Page 39, Section 16.5.
Do not repair or disassemble on site.
Replace faulty gas valves with genuine
replacement parts sold and supplied by
Roberts-Gordon.
13.6 Flue Fan
The flue fan should not require maintenance.
However, if the air pressure switch is causing burner
lockout, then remove the flue fan from the vent box
by unscrewing the screw at the outlet flange and the
flue fan mounting plate (See Page 38, Section 16.4).
Ensure that the fan is free to run and that the fan
wheel is clean.
SECTION 14: CONVERSION BETWEEN GASES
SECTION 14: CONVERSION BETWEEN GASES
14.1 General
Conversion between gasses will require a change of
burner injectors and the gas valve re-commissioning
to the new conditions.
14.2 Burner Conversion
Conversion of the burner assembly from one gas to
the other is the same for all types of heaters.
1. Remove the burner compartment cover as
shown on Page 36, Section 16.2.
2. Remove the connection between the gas valve
outlet and the manifold. See Page 35, Section
16.1 for gas valve removal.
3. Remove the manifold from the burner assembly by removing the screws at the top and bottom. See Page 36, Section 16.2.1.
4. Remove the main burner injectors.
5. Replace with the injectors for the new gas
ensuring a gas tight seal.
6. Refit all components in reverse order.
14.3 Gas Valves
All gas valves used on the CTU have pressure
regulators that may be set to operate on natural gas
or LPG.
Conversion is carried out by re-setting the burner
pressure to the value in the data table during
commissioning. See Page 8, Section 4.4.
Ensure that the gas inlet pressure to the heater is
correct for the new gas, and that the gas supply has
been purged of the old gas.
31
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 15: TROUBLESHOOTING
15.1 General
WARNING
Explosion Hazard
Installation must be done by a registered installer/
contractor qualified in the installation and service of
gas-fired heating equipment or your gas supplier.
Failure to follow these instructions can result in death,
injury or property damage.
Installation Code and Annual Inspections: All
installations and service of ROBERTS
GORDON® equipment must be performed by a
contractor qualified in the installation and service
of equipment sold and supplied by RobertsGordon and conform to all requirements set forth
in the ROBERTS GORDON® manuals and all
applicable governmental authorities pertaining to
the installation, service and operation of the
equipment.
To help facilitate optimum performance and safety,
Roberts-Gordon recommends that a qualified
contractor annually inspect your ROBERTS
GORDON® equipment and perform service
where necessary, using only replacement parts
sold and supplied by Roberts-Gordon.
Start
Are gas & electrical
supplies on?
No
Turn on supplies.
Yes
Use 15.2 to test burner.
Yes
Is Red lockout
warning light on?
No
With external controls on,
does the burner continue
to fire?
No
Check limt thermostat(s);
Reset.
No
Use 15.2 to test burner.
No
Check time delat relay. Is
there 230 V accross brown
and blue wires?
No
Check for mis-wiring.
Yes
Yes
Is distribution air fan
operating?
Yes
Change time delay relay.
Yes
Heater Operating
TROUBLESHOOT ENDS.
No
If problems persist, contact
ROBERTS GORDON® at
Tel: +44(0)121 506 7709
www.rg-inc.com
For your safety and optimum heater performance, use only replacement parts sold and supplied by
Roberts-Gordon.
Conduct Commissioning procedure as shown on Page 24, Section 11.
32
SECTION 15: TROUBLESHOOTING
15.2 Troubleshooting For Automatic Ignition Burner Systems
There are two burner controls used: Honeywell S4563C and
S4565C. They both have similar operating sequences. To
measure flame current, connect a 0 - 50 μA DC meter in
series with the flame probe. If the meter reads negative
values, then reverse the test leads.
WARNING
Electrical Shock Hazard
Do not touch ignition components.
Start
Are gas & electrical
supplies on?
Voltage from ignition components is high.
No
Turn on supplies.
No
Are external controls on?
Yes
Press in lockout reset button
on rear of heater or remote
reset button if fitted.
Failure to follow these instructions can
result in death or electrical shock.
Yes
Is the green light on?
Yes
Has the thermostat limit
thermodisc operated or light
faulty? Reset or replace as
necessary.
Yes
Is red lockout light on?
No
Does flue fan run?
No
Is 230 V supply at fan
connections?
Yes
Flue fan faulty replace
No
Burner control faulty or plug
in connections faulty. Repair
or replace as necessary
Yes
Does air pressure switch
change over?
No
Check for too much flue/air inlet
duct. Check for blockage in
combustion air circuit.
Check for faulty air pressure
switch. See section 16.5.
Yes
Wait 30 - 40 seconds.
Is ignition spark operating? No
Is HT lead okay and
connected?
Yes
Is spark electrode okay?
Ignition control faulty
replace.
See Section 15.6.
Yes
Does the flame light?
No
Is the gas valve operating?
To test valve,
No
see Section 15.4.
Replace valve.
Yes
Is red lockout light on?
Yes
Is the flame current at
least 1 µAmp DC when
the flame lights?
No
Heater Operating
TROUBLESHOOT ENDS.
No
If problems persist, contact
ROBERTS GORDON® at
Tel: +44(0) 121 506 7709
www.rg-inc.com
No
Trace fault in supervision
system. See Section 16.3.
For your safety and optimum heater performance,
use only replacement parts sold and supplied by
Roberts-Gordon.
Conduct Commissioning procedure as shown
on Page 24, Section 11.
33
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
15.3 Troubleshooting for Flame Supervision System
START
Connect a DC ammeter in
series with the flame probe.
Is the green light on and
at least 1 µA DC flame
current?
Use section 15.1 to
trace the fault.
No
Yes
Is there a current flowing in the
flame probe circuit with no
flame present?
Yes
Is the connecting lead
damaged? Is the flame probe
damaged or touching earthed
components?
Yes
Repair or replace as
necessary.
Yes
Is inlet burner gas pressure
correct? Is live and neutral
polarity correct? Is
flame probe circuit correct?
Yes
Control box faulty.
Replace with correct type.
No
Does “lockout” occur when
there is a flame present?
No
Repair or replace as
necessary.
No
Heater Operating
TROUBLESHOOT ENDS.
No
If problems persist, contact
ROBERTS GORDON® at
Tel: +44(0) 121 506 7709
www.rg-inc.com
NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.
15.4 Troubleshooting for Solenoid Valves
START
Is 230 V at the valve
terminals at the
appropriate time.
No
Fault elsewhere
No
Fault elsewhere
No
Valve faulty.
Replace with one of
correct type.
No
Valve faulty.
Replace with one of
correct type.
No
If problems persist, contact
ROBERTS GORDON® at
Tel: +44(0) 121 506 7709
www.rg-inc.com
Yes
Is gas pressure at inlet of the
valve correct for gas type?
Note pressure found.
Yes
Does gas pressure at outlet
of the valve rise when
valve turns on?
Yes
Yes
Does gas pressure at
outlet of valve return to zero or
lower when valve turns off?
Yes
Valve Operating
TROUBLESHOOT ENDS.
34
SECTION 16: REMOVAL AND REPLACEMENT PARTS
SECTION 16: REMOVAL AND REPLACEMENT PARTS
See warnings and notes on Page 30, Section 13
before removing or replacing parts.
Burner Components
All serviceable burner parts are accessed by the
door on the right side of the heater. Use a
screwdriver to turn the latch 90°. See Page 5,
Section 4.
16.1 Gas Valve
Remove the gas supply pipe at the heater inlet.
16.1.1 Models 22 - 60
Remove
fixing
screw
Disconnect
wire harness
Unplug
control
from
valve
Ignition
Control
Description
Gas Valve VR4105A
Ignition Control
Part Number
90033403
90434010
16.1.2 Models 75 - 115
Unplug
electrical lead.
(rectifier harness)
Step 1
Unscrew
gas pipe
from the
valve inlet.
Ignition
Control
Description
Gas Valve VR4605
Ignition Control
Part Number
90033404
90434020
Step 2
Unscrew valve from the
burner manifold
or
unscrew the fixing screws for
the inlet and outlet flanges.
16.1.3 All Models
Replace in reverse order. Verify that the gas flow
direction of the valve is correct. Use a minimum
amount of gas seal on the thread joint. Re-use the
"O" ring seal in the outlet flange where fitted. Check
that all the joints are leak free. Reset gas valve. See
Page 26, Section 11.4.2.
IT IS IMPORTANT THAT ONLY THE CORRECT
GAS VALVES SPECIFIED FOR EACH MODEL
TYPE ARE USED WHEN REPLACING THESE
CONTROLS.
35
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
16.2 Burner Compartment
The burner compartment is a sealed
Burner
compartment
compartment. Following any work,
cover
re-seal the compartment with the gas
pipe rubber seal fully in place and all Flame probe
screws fitted and tight.
Viewing port
for flame probe
Remove flexible
air duct from spigot
Ignition electrode
Viewing port
for ignition electrode
Remove
access plate
Rubber Seal
Remove screws and
pull off burner cover
16.2.1 Burner Injectors
Ensure gas tight fitting of injectors.
Ensure correct alignment with burners.
Ensure all pipe joints are gas tight.
Manifold
Burners
Remove manifold
screws and pull
out manifold
Injectors
Manifold
Unscrew
Injectors
Burner
venturi
Burner
Screws
Marking
MODEL
CTU-22
CTU-30
CTU-35
CTU-40
CTU-50
CTU-60
CTU-75
CTU-90
CTU-100
CTU-115
Injector Quantity
5
5
6
7
9
11
12
14
15
17
Natural Gas (G20) and (G25)
Injector size mm Ø
2.08
2.25
2.25
2.25
2.25
2.25
2.71
2.71
2.71
2.71
in Ø
0.0819
0.0886
0.0886
0.0886
0.0886
0.0886
0.1067
0.1067
0.1067
0.1067
45
225
225
225
225
225
36
36
36
36
Marking
RG P/N
91930045 91930225 91930225 91930225 91930225 91930225 91930036 91930036 91930036 91930036
LPG Gas Propane (G31) and LPG Gas Butane (G30)
Injector size mm Ø
1.25
1.40
1.40
1.40
1.40
1.35
1.51
1.51
1.51
1.51
in Ø
0.0492
0.0551
0.0551
0.0551
0.0551
0.0531
0.0594
0.0594
0.0594
0.0594
125
54
54
54
54
135
53
53
53
53
Marking
RG P/N
36
91930125 91930054 91930054 91930054 91930054 91930135 91930053 91930053 91930053 91930053
SECTION 16: REMOVAL AND REPLACEMENT PARTS
16.3 Ignition Electrode and Flame Probe
Burners
Thermostat
Limit
Thermodisc
Flame
Probe
Remove all
burner compartment
screws to remove
the burner
compartment and
access the
“Front View”.
Flame
Probe
Remove
Screw
Burner Compartment
Front Views
Ignition
Electrode
Ignition
Electrode
.120
(3 mm)
spark
gap
Burners
To replace the ignition electrode or flame probe, remove the electrical lead and screw.
Pull out from mounting. Refit in reverse ensuring that the gap to burner is as shown in the
front view of the burner compartment.
Description
Spark Electrode
Automatic Ignition Flame Probe
Burners (all models except CTU-40)
Burners - CTU-40
Part Number
90427411
90439300
92000000
92000001
37
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
16.4 Flue Fan
Rear Panel
Remove screws securing outlet
flange to the flue adapter.
Flue Adapter
to Flue Fan
screws
Hole
Vent Box
Vent Box
Screws
Outlet
Gasket
Flue
Adapter
Flue Fan
Disconnect
electrical connections
at plug in tabs.
Vent Box
Mounting
Plate
Mounting Plate
to Vent Box
Screws
Gasket
Gasket
Mounting Plate
to Flue Fan
Screws
MODEL
Flue Fan
RG P/N
CTU-22
Air Plate
CTU-30
CTU-35
CTU-40
CTU-50
CTU-60
Remove screws securing flue
fan mounting plate to vent box.
Remove screws securing
mounting plate to fan.
Refit in reverse.
Use new gaskets.
Ensure sealed joints.
Ensure mounting plate orifice is
clear and not obstructed.
CTU-75
CTU-90
CTU-100
CTU-115
Torin DSA Torin DSA Torin DSA Torin DSA
508-128
508-128
508-128
508-128
077272
077272
077272
077272
Torin DSA Torin DSA AO Smith AO Smith AO Smith Torin DSF
524-202
524-202 JFIG098NS JFIG098NS JFIG098NS 146-052
077273
077273
077274
90710430 90710430
90710440 90710440 90710001
90710430
90710430
90710001
90710001
90710450
Air mm Ø
Plate in Ø
47.6
1.875
53.1
2.09
60.7
2.39
69.1
2.72
60.7
2.39
69.9
2.75
97.0
3.82
103.6
4.08
110.5
4.35
152.4
6
RG P/N
11011139
1101138
1101140
11011137
11011136
11011135
11011134
11011133
11011132
11011131
IT IS IMPORTANT THAT ONLY THE CORRECT FLUE FAN SPECIFIED FOR EACH MODEL TYPE IS
USED WHEN REPLACING THESE ITEMS.
Carry out a commission after working on or changing a flue fan. See Page 28, Section 12.
38
SECTION 16: REMOVAL AND REPLACEMENT PARTS
16.5 Pressure Switch
Pull off 3 way connector. Spring open plastic clips of
mounting cradle. Replace with correct type of
pressure switch for model. The pressure switches
are colour coded for each pressure setting.
WARNING
Carbon Monoxide Hazard
Use correct pressure switch specified for each model.
Use of incorrect pressure switch could cause unsafe
condition.
Failure to follow these instructions can result in
death or serious injury.
Carry out a commission after working on or
changing a pressure switch. See Page 24, Section
11.
Pressure
Switch
CTU-22
CTU-30
CTU-35
CTU-40
CTU-50
CTU-60
CTU-75
CTU-90
CTU-100
CTU-115
RG P/N
90439801
Colour
Code
pink
grey
white
grey
grey
yellow
grey
brown
grey
brown
Set Point
mbar
0.57
0.92
1.17
1.02
0.87
0.80
1.79
1.69
1.79
1.69
in wc
0.23
0.37
0.47
0.41
0.35
0.32
0.72
0.68
0.72
0.68
90439810 90439804 90439803 90439810 90439802 90439811 90439807 90439811 90439807
39
COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
16.6 Ignition Control
IT IS IMPORTANT THAT ONLY THE CORRECT
IGNITION CONTROL SPECIFIED FOR EACH
MODEL TYPE IS USED WHEN REPLACING
THESE ITEMS.
16.6.1 S4565C Models 22 to 60
This control plugs onto the gas valve. Pull out 12 pin
electrical connection. Pull out ignition cable and
flame probe cable noting their positions
Release screw securing control to gas valve
Refit in reverse. Ensure correct location of ignition
and flame probe cables. Ensure that the earth
connection is made directly to the earth point on the
gas valve.
16.6.2 S4563C Models 75 to 115
This control is mounted at the electrical mounting
plate. Pull out the 3 cable connectors.
Pull out ignition cable, ignition earth and flame
probe cable noting their positions. Remove the
screws. Refit in reverse. Ensure correct location of
ignition and flame probe cables.
• Check that the fan blades are free to rotate
before turning on the power to the fan.
• Strictly comply with the colour code of the fan
wires to ensure correct operation. See Page 16,
Section 10.3 through Page 17, Section 10.4 wiring diagrams
• Use only genuine replacement parts sold and
supplied by Roberts-Gordon.
16.8 CTUB & CTUC Centrifugal Fan/Guard/Motor
Assembly
The direct drive fan/s for the CTUB & CTUC range
is supplied as a complete assembly. Take careful
note of the electrical connections of the fan before
disconnecting from the terminals.
For the CTUC versions fitted with an inlet spigot
assembly, the fans may be accessed through the
removable covers on the sides, top and bottom of
the spigot, as required.
16.8.1 Fan Removal and Replacement
20 mm x 5 mm Adhesive Seal
is applied to the flange.
16.7 CTUA Axial Fan/Guard/Motor Assembly
The axial fan unit for the CTUA heater is
supplied completely assembled and balanced.
16.7.1 Fan Removal and Replacement
Remove the four screws
and rubber washers.
Description
Torin Fan DDC 270-270
Torin Fan DDC 241-241
Part Number
A047
A049
Remove the fan by removing the fixing screws while
supporting the weight of the fan (approx. 19 kg).
Description
Axial Fan 16 in.
Axial Fan 500 mm.
Part Number
90710418
90710419
16.7.2 To Replace the Fan Assembly
To replace the fan assembly, reverse the procedure
shown above. Fit rubber washers to the guard
mountings to reduce vibration.
40
16.8.2 To Replace the Fan(s)
To reassemble, reverse the procedure shown
above.
• Fit new rubber seal between the fan flange and
the heater rear panel.
• Fit to the rear panel in the correct orientation as
shown on Page 41, Figure 14.
• Strictly comply with the colour code of the fan
wires to ensure correct operation. See Page 18,
Section 10.5 through Page 20, Section 10.7
wiring diagrams.
SECTION 16: REMOVAL AND REPLACEMENT PARTS
• Use only genuine replacement parts sold and
supplied by Roberts-Gordon.
The three speed winding connections are:
Low speed: White N, Red Live The other two
windings are "parked" separately in spare terminals.
Medium speed: White N, Blue live. The other two
windings are "parked" separately in spare terminals.
High speed: White N, Black live. The other two
windings are "parked" separately in spare terminals.
• Check that the fan blades are free to rotate
without catching before turning on the power to
the fan.
• Set all fans to operate at the same speed.
Figure 14: Centrifugal Fan Orientation
CTUB/C 22-40
CTUB/C 50-90
CTUB/C 100-115
16.9 Fan Data
MODEL
CTU-22
CTU-30
CTU-35
CTU-40
CTU-50
CTU-60
CTU-75
CTU-90
CTU-100
CTU-115
Axial Fan Type
CTUA Models
Axial Fan
16 in.
Axial Fan
16 in.
Axial Fan
16 in.
Axial Fan
16 in.
Axial Fan
500 mm
Axial Fan
500 mm
Axial Fan
16 in.
Axial Fan
16 in.
Axial Fan
500 mm
Axial Fan
500 mm
RG P/N
90710418 90710418 90710418 90710418 90710419 90710419 90710418 90710418 90710419 90710419
Quantity
1
1
1
1
1
1
2
2
2
2
Fan Rating
(Watts per Fan)
160
160
160
160
370
370
160
160
370
370
Centrifugal Fan Type
CTUB/C Models
Torin
241-241
Torin
241-241
Torin
241-241
Torin
241-241
Torin
241-241
Torin
241-241
Torin
270-270
Torin
270-270
Torin
270-270
Torin
270-270
RG P/N
A049
A049
A049
A049
A049
A049
A047
A047
A047
A047
Quantity
1
1
1
1
2
2
2
2
3
3
Normal Fan Rating (W)
1100
1100
1100
1100
1100
1100
1200
1200
1200
1200
High Fan Rating (W)
1400
1400
1400
1400
1400
1400
1700
1700
1700
1700
41
Attach this information to the wall near the ROBERTS GORDON® heater
®
Read the Installation, Commissioning, Operation and Service Manual thoroughly before installation, operation or service.
WARNING
OPERATING INSTRUCTIONS
1. STOP! Read all safety instructions on this information sheet.
2. Open the manual gas valve in the heater supply line.
3. Turn on electric power to the heater.
4. Set the thermostat to desired setting (above ambient temperature).
The automatic starting sequence begins.
NOTE: Following long shutdown periods, the burner control may go to
to 'LOCKOUT' during the start sequence. Push the reset button to
recommence firing. Contact service department if 'LOCKOUT'
continues (see manual for details).
TO TURN OFF THE HEATER
1. Turn the thermostat/time switch to 'OFF'. The burner will turn 'OFF'
immediately, but fans will continue to cool heat exchanger until the fan
thermostat switches off.
IF THE HEATER WILL NOT OPERATE, TO ENSURE YOUR SAFETY,
FOLLOW THESE INSTRUCTIONS TO SHUT DOWN YOUR HEATER
1. Set the thermostat to off or the lowest setting.
2. Turn off electric power to the heater.
3. Turn off the manual gas valve in the heater supply line.
4. Call your registered installer/contractor qualified in the installation
and service of gas-fired heating equipment.
Fire Hazard
Some objects can catch fire or explode when placed
close to heater.
Keep all flammable objects, liquids and vapors the
required clearances to combustibles away from heater.
Failure to follow these instructions can result in death,
injury or property damage.
Installation Clearances
Clearances to Combustibles
Roof Terminal
Air
Intake
Wall
Terminal
15 cm
15 cm
Flue
60 cm
3m
50 cm
50 cm**
30 cm
2.5 - 3.5 m*
**80 cm is necessary to service heater.
*Heaters may be mounted at a higher level if destratification
fans and/or turn down nozzles are installed.
Roberts-Gordon Europe Limited
Unit A, Kings Hill Business Park
Darlaston Road, Wednesbury
West Midlands WS10 7SH UK
Telephone: +44(0)121 506 7700
Fax: +44(0)121 506 7701
Service Telephone: +44(0)121 506 7709
Service Fax: +44(0)121 506 7702
E-mail: uksales@rg-inc.com
E-mail: export@rg-inc.com
Roberts-Gordon, LLC
1250 William Street
P.O. Box 44
Buffalo, NY 14240-0044 USA
Telephone: 716.852.4400
Fax: 716.852.0854
Toll Free: 800.828.7450
Installation Code and Annual Inspections:
®
All installations and service of ROBERTS GORDON equipment must be performed by a contractor qualified in the installation and service of equipment sold and supplied by Roberts-Gordon and
®
conform to all requirements set forth in the ROBERTS GORDON manuals and all applicable governmental authorities pertaining to the installation, service and operation of the equipment. To help
®
facilitate optimum performance and safety, Roberts-Gordon recommends that a qualified contractor annually inspect your ROBERTS GORDON equipment and perform service where necessary,
using only replacement parts sold and supplied by Roberts-Gordon.
For installations at elevations above 2000' (610 m), the appliance shall be derated 4% for each 1000' (305 m) of elevation above sea level.
®
Further Information:Applications, engineering and detailed guidance on systems design, installation and equipment performance is available through ROBERTS GORDON representatives.
Please contact us for any further information you may require, including the Installation, Commissioning, Operation and Service Manual.
These products are not for residential use.
© 2007 Roberts-Gordon, LLC
www.rg-inc.com
Printed in U.S.A.
P/N 91040028 Rev B