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© 2007
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 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 C
12
, C
32
& C
62
Appliance....................................10
6.3 Type B
22
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