Roberts Gorden CUHA Guide

C mbat®
Roberts-Gordon
Oxford Street
Bilston, West Midlands WV14 7EG UK
Telephone: [phone]
Fax: [phone]
Service Telephone: [phone]
Service Fax: [phone]
Export Sales Telephone: [phone]
Export Sales Fax: [phone]
E-mail: [e-mail]
E-mail: [e-mail]
www.combat.co.uk www.rg-inc.com
®
WARNING
Installation must be done by a registered installer/
contractor qualified in the installation and service
of gas-fired heating equipment or your gas supplier.
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.
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 to provide your
serviceman with information should it become
necessary.
WARNING
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.
Fire Hazard
Do not store or use petrol or other
flammable vapours and liquids in the
vicinity of this or any other appliance.
Failure to follow these instructions can
result in death injury or property
damage.
© Copyright 2002 Roberts-Gordon
Quality in Any Language™
Installation, Commissioning,
Operation & Service Manual
Model CUH
(A, B, C, D)
60 to 240 Manual Ignition
Model CUH
(A/A, B/A, C/A, D/A)
60 to 380 Automatic Ignition
X404E Rev A 07/02
Unit Heaters

© 2002
All rights reserved. o 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.
Printed in U.K.
TABLE OF CONTENTS
...................................................................Product Approval 1
SECTION 1: Heater Safety ...................................................... 2
SECTION 2: Installer Responsibility ..................................... 2
2.1 Low Level User Instructions......................................... 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 Clearances to Combustibles.........3
3.4 Ventilation .................................................................... 3
3.5 Gas Supply .................................................................. 3
3.6 Electrical Supply .......................................................... 3
3.7 Flue.............................................................................. 3
SECTION 4: Specifications .................................................... 6
4.1 All Models ....................................................................6
4.2 Components Identification ...........................................7
4.3 General Technical Data Table (all models) .................. 8
4.4 Technical Data Table - CUHA, CUHB, CUHC and
CUHD Manual Ignition Range .....................................9
4.5 Technical Data Table - CUHA/A, CUHB/A, CUHC/A
and CUHD/A Automatic Ignition Range ....................10
4.6 Gas Controls - Automatic Ignition .............................. 11
4.7 Gas Controls - Manual Ignition .................................. 11
4.8 Main Fan.................................................................... 11
4.9 Limit Thermostats ...................................................... 11
4.10 Thermocouple Interrupter Relay .............................. 11
4.11 Automatic Ignition - Burner Control Box .................. 11
SECTION 5: Heater Installation............................................ 13
5.1 General......................................................................13
5.2 Handling .................................................................... 13
5.3 Shelf Mounting and Suspension................................ 13
SECTION 6: Flue Installation ............................................... 14
6.1 Flue Installation ......................................................... 14
6.2 Models 340 and 380 only .......................................... 16
SECTION 7: Air Supply ......................................................... 17
7.1 Air Supply ..................................................................17
7.2 Building Ventilation .................................................... 17
SECTION 8: Optional Heater Configurations ..................... 18
8.1 Distribution Ductwork for CUHB, CUHC and CUHD
Heaters ......................................................................18
SECTION 9: Gas Piping ........................................................ 20
SECTION 10: Wiring and Electrical Information ................ 21
10.1 Electrical Supply ...................................................... 21
10.2 Remote Controls...................................................... 21
10.3 CUH Individual Controls (all models).......................22
10.4 CUHD External Motor Alternative Wiring
(all models) .............................................................. 22
10.5 CUHA Wiring Diagram............................................. 23
10.6 CUHB & CUHC Wiring Diagram (60-160) ............... 23
10.7 CUHB & CUHC Wiring Diagram (180-240) ............. 24
10.8 CUHD Wiring Diagram (all models)......................... 25
10.9 CUHA/A Wiring Diagram (60-240) Satronic.............26
10.10 CUHA/A Wiring Diagram (280-300) Satronic......... 27
10.11 CUHA/A Wiring Diagram (340-380) Satronic......... 27
10.12 CUHB/A & CUHC/A Wiring Diagram (60-160)
Satronic ................................................................. 28
10.13 CUHB/A & CUHC/A Wiring Diagram (180-300)
Satronic ................................................................. 29
10.14 CUHB/A & CUHC/A Wiring Diagram (340-380)
Satronic .................................................................30
10.15 CUHD/A Wiring Diagram (60-300) Satronic...........31
10.16 CUHD/A Wiring Diagram (340-380) Satronic.........31
10.17 CUHA/A Wiring Diagram (60-240) Honeywell........32
10.18 CUHA/A Wiring Diagrams (280-300) Honeywell....33
10.19 CUHA/A Wiring Diagram (340-380) Honeywell......33
10.20 CUHB/A & CUHC/A Wiring Diagram (60-160)
Honeywell ..............................................................34
10.21 CUHB/A & CUHC/A Wiring Diagram (180-300)
Honeywell ..............................................................35
10.22 CUHB/A & CUHC/A Wiring Diagram (340-380)
Honeywell .............................................................36
10.23 CUHD/A Wiring Diagram (60-300) Honeywell .......37
10.24 CUHD/A Wiring Diagram (340-380) Honeywell .....37
SECTION 11: Commissioning The Heater ..........................38
11.1 Pre Commission Checks..........................................38
11.2 Gas Supply ..............................................................38
11.3 Mechanical Checks ..................................................38
11.4 Automatic Ignition Unit Heaters ...............................39
11.5 Manual Ignition Unit Heaters....................................42
11.6 Commissioning Tests - (all models)
Spillage Test.............................................................43
11.7 Combustion Testing - (all models)............................43
11.8 Pilot Drop-Out Test - Manual Ignition Models ..........43
11.9 Turning Off the Heater - (all models)........................43
11.10 External Controls ...................................................43
11.11 Complete the Installation .......................................43
11.12 Instruction to the User............................................43
SECTION 12: User Instructions ...........................................44
12.1 User Instructions ......................................................44
12.2 Heater Operation .....................................................44
12.3 Common User Controls (all models)........................44
12.4 Automatic Ignition User Controls .............................45
12.5 Automatic Ignition Lighting Instructions ...................45
12.6 Manual Ignition User Controls..................................45
12.7 Manual Ignition Lighting Instructions........................45
12.8 Simple Fault Finding (all models).............................46
12.9 Service Requirements .............................................47
SECTION 13: Servicing.........................................................48
13.1 Servicing Instructions...............................................48
13.2 Fan/Motor Assembly Maintenance
(all models)...............................................................48
13.3 Heat Exchanger Maintenance..................................48
13.4 Gas Control Valve Maintenance (all models)...........49
13.5 Manual Ignition.........................................................49
SECTION 14: Conversion Between Gases..........................50
14.1 General ....................................................................50
14.2 Burner Conversion ...................................................50
14.3 Gas Valves - Automatic Ignition ...............................50
14.4 Conversion of Manual Ignition Valves ......................52
SECTION 15: Troubleshooting .............................................53
15.1 General for Automatic Ignition..................................53
15.2 Troubleshooting For Automatic Ignition Burner
Systems ...................................................................55
15.3 Flame Supervision System ......................................57
15.4 Troubleshooting for Solenoid Valves ........................58
15.5 Troubleshooting for Main Fan...................................58
15.6 Troubleshooting for Fan Contactor ...........................59

SECTION 16: Removal and Replacement Parts ................. 60
16.1 Burner Tray .............................................................. 60
16.2 Main Burner Bars / Injectors.................................... 60
16.3 Pilot Burner Assembly (where fitted). ...................... 62
16.4 Gas Control Valves.................................................. 63
16.5 CUHA Axial Fan/Guard/Motor Assembly................. 63
16.6 CUHB & CUHC Centrifugal Fan/Guard/Motor
Assembly................................................................. 64
16.7 Combination Fan/Limit Thermostat ......................... 64
16.8 Second Limit Thermostat ........................................ 64
16.9 Major Components Descriptions ............................. 66

TABLE OF FIGURES
Figure 1: Clearances to Combustibles ...................................... 4
Figure 2: Flue Termination ........................................................ 5
Figure 3: Offset Flues with 135° bends.....................................5
Figure 4: Ducting ...................................................................... 5
Figure 5: Combination Fan/Limit Thermostat.......................... 12
Figure 6: Honeywell Control ................................................... 12
Figure 7: Suspension Methods ...............................................13
Figure 8: Guy Wire.................................................................. 14
Figure 9: Socket Direction....................................................... 14
Figure 10: Flue and Roof Detail.............................................. 15
Figure 11: Flue and Heater Spigot Joint Detail ....................... 15
Figure 12: Heaters installed in isolated equipment rooms...... 19
Figure 13: CUH C or D Heaters with Inlet/Outlet Duct
Spigots and Flange................................................ 19
Figure 14: Gas Connection with Stainless Steel Flex
Connector .............................................................. 20
Figure 15: Setting Louvers ...................................................... 38
Figure 16: S.I.T. Tandem 0.830.033 Gas Valve
(Natural gas) 0.830.020 Valve (L.P.G) ...................40
Figure 17: S.I.T. Nova 0.822.177 Automatic Ignition
Gas Valve .............................................................. 40
Figure 18: S.I.T. Nova 0.820.054 Manual Ignition
Gas Valve .............................................................. 41
Figure 19: Main Gas Valves for Models 340 and 380 .............41
Figure 20: Heater Operating Sequence .................................. 44
Figure 21: Fan/Limit Thermostat ............................................. 44
Figure 22: S.I.T. Nova Valve for Manual Ignition,
Operation ............................................................... 46
Figure 23: Pilot Burner Options .............................................. 50
Figure 24: Conversion of Nova Family Valve .......................... 51
Figure 25: Conversion of Honeywell Gas Valve for L.P.G. ......51
Figure 26: Automatic Burner Control Box Sequence ..............56

1
Product Approval
ROBERTS GORDO ® appliances have been tested and 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 L.P.G. gas when
installed, commissioned and maintained in accordance with these instructions.
These instructions refer to appliances designed to operate in the following countries: Austria (AT),
Czech Republic (CZ), Denmark (DK), Estonia (EE), Finland (FI), Greece (GR), Ireland (IE),
Italy (IT), Portugal (PT), Slovak Republic (SK), Spain (ES), Sweden (SE), Switzerland (CH)
& United Kingdom (GB).
Appliances designed for other countries are available on request.
This appliance must be installed in accordance with the rules in force and used only in a sufficiently
ventilated space, as specified in these instructions.
Before installation, check that the local distribution conditions, nature of gas and pressure, and
adjustment of the appliance are compatible.

COMBAT®CUH UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
2
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 elec-
trical 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 cited codes and regulations 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 and flues.
• To provide access to burners for servicing, for
burner removal.
• 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 safety and local regulations.
2.1 Low Level User Instructions
In all situations, clearances to combustibles must be
maintained. See Page 4, Figure 1.
2.2 Corrosive Chemicals
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 com-
pounds are frequently used in refrigerants, cleaning
agents, solvents, etc. If these compounds enter the air
supply of the burner, the lifespan of the heater compo-
nents 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
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.
• Gas Safety (Installations and Use) Regulations
1994.
• BS 6230 Specification for the Installation of Gas
Fired Forced Convection Air Heaters for
Commercial and Industrial Space Heating of
Rated input Exceeding 60kW.
• BS 6891 Installation of Low Pressure Pipes up
to 28mm (R1) or Institute of Gas Engineers Doc-
uments IGE/UP/1 and IGE/UP/2 as appropriate.
• BS 5588 Part 11 Fire Precautions In the Design
and Construction of Buildings.
• Building Regulations; The I.E.E Regulations;
The Health and Safety at Work etc. Acts; Any
Requirements of the Local Authority, Fire Officer
and Insurance Company.
• BS 5440 Parts 1 Installation of Flues and
Ventilation of Gas appliances of Rated Input Not
Exceeding 60kW.
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.

SECTION 3: CRITICAL CONSIDERATIONS
3
SECTION 3: CRITICAL CONSIDERATIONS
3.1 Basic Information
The following types of heaters in the CUH range are
covered by these instructions and are for ON/OFF
operation only. High/Low or modulating versions are
covered in a supplement.
Fan Type Manual Ignition Automatic Ignition
Axial CUHA 60 to 240 CUHA/A 60 to 380
Centrifugal CUHB 60 to 240 CUHB/A 60 to 380
Ducted Inlet CUHC 60 to 240 CUHC/A 60 to 380
No Fan CUHD 60 to 240 CUHD/A 60 to 380
COMBAT®CUH ranges of unit air heaters are type
B11 appliances for vertical flue.
Models in the 80 to 380 range are for use with
natural gas or L.P.G. as stated on the heater data
plate. Models 60 are foruse with natural gas only. All
models are intended for indoor installation only.
3.2 Location and Suspension
All models must be installed in a level position and
may be suspended from above (See Page 13,
Figure 7) or from wall brackets of sufficient strength
to support the heater as listed in the General
Technical Data Table on Page 8, Section 4.3. Drop
rods must be a minimum of 10 mm diameter mild
steel. Four hanging brackets are located on top of
the heater. All heaters may be mounted on a shelf of
non combustible material.
It is important that the lower front and rear panels
remain accessible for burner routine maintenance
and repairs. The burner may only be removed from
the front lower panel. The rear lower panel must be
removed to accomplish this.
3.3 Minimum Required Clearances to
Combustibles
Clearances around the heater and flue must be as
indicated on Page 4, Figure 1 through Page 5,
Figure 3 to ensure access for servicing, correct
operation and to maintain the clearance to
combustibles.
3.4 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 codes.
3.5 Gas Supply
It is important that the gas supply pipe and the
electrical connections do not support any of the
heater’s weight.
3.6 Electrical Supply
A permanent 230v 50Hz electrical supply is required
at the main electrical terminals. The heater also
requires suitable energy controls in accordance with
Section 10.
3.7 Flue
Choose heater siting to allow for the proper location
of the flue. Each heater must be fitted with an
individual and correctly sized stainless steel flue
(See Page 6, Section 4).
No other appliance may be connected to the flue.
It is important that flues are designed to prevent
down draughts. It is essential that the spillage test
on Page 43, Section 11.6 is carried out.

COMBAT®CUH UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
4
Figure 1: Clearances to Combustibles
Installation Clearances to Combustibles for all models:
Model A
back of fan
(m)
B
sides
(m)
C
recommended
mounting height (m)
D
burner removal
(m)
E
combustibles
(m)
F
above
(m)
CUHA 0.6 0.8 2.75 - 3.0 1.1 3.0 0.6
CUHB 0.6 0.8 2.75 - 3.75 1.1 3.0 0.6
CUHC See Figure 4 0.8 2.75 - 3.75 1.1 3.0 0.6
CUHD See Figure 4 0.8 N/A 1.1 3.0 0.6
A
F
E
DBB
C
Temperature of any combustible material near the flue
must not exceed 65°C hen the heater is in operation.
If installed at low levels where
individuals can come in contact
with hot heat exchanger
components, adequate guarding
must be provided.
WARNING
Fire Hazard
Some objects will 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.

SECTION 3: CRITICAL CONSIDERATIONS
5
Figure 2: Flue Termination Figure 3: Offset Flues with 135° bends
Figure 4: Ducting
1 m
Minimum
Roof
Wall
*If the point
of roof
intersection
is within 2.5 m
of a nearby
structure, the
flue must
terminate
at least
1 m above
that structure.
*Less than
2.5 m
earby
Structure
*1 m
Minimum
Flues up to 200 mm dia. are fitted
with Bird Screens, over 200 mm
with a Rain Cap.
Use adequate
support to
prevent heater
from carrying
the weight of
the flue.
135°
Roof
Wall
Minimum Total
1m +
(0.5m for each 135° bend) +
(1m for each 0.33m of flue
running in the 135° direction)
1 m
Minimum
above roof
Use adequate
support to
prevent heater
from carrying
the weight of
the flue.
AIRFLOW AIRFLOW
Lower Front Panel
Lower Rear Panel
Airflow Indicator
Ducting
Ducting
All joints between the heater and ductwork
should be made as air tight as possible.
Dimension
X
Area required for
Burner Removal
Minimum-
Twice
Dimension
X
1.1m
Minimum
Dimension
X
Minimum-
Twice
Dimension
X
Flexible Flange

COMBAT®CUH UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
6
SECTION 4: SPECIFICATIONS
4.1 All Models
Dimension Data - All Models
* Duct spigots width for models CUHC and CUHD. Duct spigots ’Height’ shown on above drawings.
Duct spigots are complete with 30 mm mez. flange.
Model
Ref.
60 80 100 120 140 160 180 200 240 280 300 340 380
A Width mm
(in)
519
(20½)
519
(20½)
589
(23)
589
(23)
729
(28½)
729
(28½)
869
(34)
869
(34)
1009
(39¾)
1219
(48)
1219
(48)
1359
(53½)
1499
(59)
B Sup-
port
Spacing
mm
(in)
479
(18)
479
(18)
549
(21¾)
549
(21¾)
689
(27¼)
689
(27¼)
829
(32¾)
829
(32¾)
969
(38¼)
1179
(46½)
1179
(46½)
1319
(52)
1459
(59)
C Flue
Diameter
mm
(in)
178
(7)
178
(7)
178
(7)
178
(7)
178
(7)
178
(7)
229
(9)
229
(9)
254
(10)
254
(10)
254
(10)
305
(12)
305
(12)
D Inlet &
Outlet
Spigot
Width
mm
(in)
438
(17¼)
438
(17¼)
508
(20)
508
(20)
648
(25¼)
648
(25¼)
788
(31)
788
(31)
928
(36½)
1137
(44¾)
1137
(44¾)
1277
(50¼)
1417
(55¾)
Weight
(CUHA) kg 91 91 110 110 130 130 150 150 190 200 200 210 210
Weight
(CUHB) kg 111 111 130 130 150 150 170 180 220 270 270 276 276
Weight
(CUHC) kg 128 128 148 148 169 169 191 201 243 295 295 303 304
Weight
(CUHD) kg 82 82 92 99 104 114 124 134 154 180 180 190 190
Front Views
Side Views
CUHA Models 60 - 380 CUHB Models 60 - 380
CUHC Models 60 - 380 CUHD Models 60 - 380
CUHA/B/C Models 60 - 300 CUHA/B/C Models 340 - 380 CUHD (and other models fitted with
air outlet spigots) Models 60 - 380

SECTION 4: SPECIFICATIONS
7
4.2 Components Identification
Pilot Viewing
via cut out
Gas
Connection
Access to Second
Limit Thermostat
Electrical Supply via
Cable Gland
Electrical Connections
for Main Fan, Gas Valve
and Interrupter Relay
Data Plate
Combustion
Air Slots
Lighting
Instructions
Honeywell
Combination
Fan/Limit Stat.
REAR VIEW SIDE VIEW
FRONT VIEW
Burner
Compartment
Air Deflection
Grille
Interrupter Relay
(Manual Ignition)
Flue Spigot Hanging Brackets
Draught Diverter
Terminal Box at lower back
of heater on some models.
Bottom of Terminal Box
Green Light-Heater On
Red Light-LockoutReset Button
(Honeywell Control)
Reset Button
(Satronic Control)

COMBAT®CUH UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
8
4.3 General Technical Data Table (all models)
MODEL REFERENCE 60 80 100 120 140 160 180 200 240 280 300 340 380
’A’ RANGE
Total Electrical Load
Watts 191 191 191 228 228 444 444 384 384 849 849 849 849
Fan Type Sifan PMG
35041-101
Sifan PMG
35041-101
Sifan PMG
35041-101
Sifan PMG
39041-101
Sifan PMG
39041-101
Sifan PMG
42041-101
Sifan PMG
42041-101
Sifan PMG
35041-101
Sifan PMG
35041-101
Sifan PMG
42041-101
Sifan PMG
42041-101
Sifan PMG
42041-101
Sifan PMG
42041-101
Number of
Fans Fitted 1111111222222
Capacitor µf 2.52.52.533552x2.52x2.52x52x52x52x5
Rating - Watts 170 170 170 210 210 180 180 170 170 180 180 180 180
Run Current - Amps 0.7 0.7 0.7 0.86 0.86 1.8 1.8 1.54 1.54 3.56 3.56 3.56 3.56
Start Current - Amps 1.9 1.9 1.9 2.3 2.3 3.4 3.4 4.2 4.2 6.7 6.7 6.7 6.7
Air Flow - m³/hr 2690 2690 3300 3820 4044 4706 4383 4560 6350 9310 9310 9376 9376
Air Flow - ft³/min 1583 1583 1942 2248 2380 2770 2580 2684 3737 5480 5480 5519 5519
'B' & 'C' RANGES
Total Electrical Load
Watts 900 900 1200 1200 1175 1175 1750 2200 2400 2400 2400 3500 3500
Number of
Fans Fitted 1111112222233
Direct Drive Fan TORIN
270-270
TORIN
270-270
TORIN
270-270
TORIN
270-270
TORIN
270-270
TORIN
270-270
TORIN
241-241
TORIN
241-241
TORIN
270-270
TORIN
270-270
TORIN
270-270
TORIN
270-270
TORIN
270-270
Motor Details
Size Watts 1 x 550 1 x 550 1 x 550 1 x 550 1 x 550 1 x 550 2 x 550 2 x 550 2 x 550 2 x 550 2 x 550 3 x 550 3 x 550
Normal Set Speed LOW LOW MEDIUM MEDIUM MEDIUM MEDIUM LOW MEDIUM MEDIUM MEDIUM MEDIUM MEDIUM MEDIUM
Normal Run Current
Amps 3.9 3.9 5.2 5.2 5.1 5.1 7.5 9.4 10.3 10.3 10.3 15 15
Normal Start Current
Amps 4.8 4.8 6.4 6.4 6 6 9.3 11.6 12.8 12.772 12.772 18.6 18.6
Maximums at
High Speed
Run Current - Amps 6.1 6.1 6.9 6.9 5.1 5.1 11.4 11.4 13.7 1 3.7 13 .7 17.9 17.9
Start Current - Amps 8 8 8.6 8.6 7 7 13.6 13.6 17.1 17.1 17.1 22.1 22.1
Not to be used without
reference to Combat
Air Flow - m³/hr 2500 2600 3100 3200 3250 3260 4480 5700 6200 6700 6800 9400 9400
Air Flow - ft³/min 1471 1530 1825 1883 1913 1919 2637 3355 3649 3943 4002 5533 5533
'D' RANGE
Required
Minimum Air Flow m³/hr 2500 2600 3100 3200 3250 3260 4383 4560 6200 6800 6800 9376 9376
ft³/min 1471 1530 1825 1883 1913 1919 2580 2684 3649 4002 4002 5519 5519
Pressure loss
across heat
exchanger at
required air flow
mbar 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43

SECTION 4: SPECIFICATIONS
9
4.4 Technical Data Table - CUHA, CUHB, CUHC and CUHD Manual Ignition Range
Appliance Category II 2H3+
Natural Gas Inlet Pressure 20 mbar (17 - 25)
Propane Inlet Pressure 37 mbar (25-45)
Butane Inlet Pressure 29 mbar (20-35)
*Gas rates corrected to standard conditions 1013.25 mbar 15°C
MANUAL IGNITION
MODEL NO 60 80 100 120 140 160 180 200 240
Heat Input Gross cv - kW 22.5 29.5 37 43 52 59 66.5 74 89
Heat Input Gross cv - Btu/hr 76770 100654 126244 146716 177424 201308 226898 252488 303668
Heat Input Net cv - kW 20.3 26.6 33.3 38.7 46.9 53.2 59.9 66.7 80.2
Heat Input Net cv - Btu/hr 69170 90689 113746 132191 159859 181379 204435 227492 273605
Approx. Heat Output - kW 17.78 23.31 29.23 33.97 41.08 46.61 52.54 58.46 70.31
Approx Heat Output - Btu/hr 60648 79517 99733 115906 140165 159033 179249 199466 239898
Number of Burners 44567891012
NATURAL GAS
Injector size 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94
Injector marking 840 840 840 840 840 840 840 840 840
Burner Pressure - mbar 5.9 10 10.6 10.7 12.0 12.0 12.5 12.8 14.9
Burner Pressure - in. w.c. 2.4 4.0 4.2 4.3 4.8 4.8 5.0 5.1 6.0
*Gas Rate - m³/hr 2.14 2.81 3.53 4.10 4.96 5.62 6.34 7.05 8.48
Gas Rate - ft³/hr 75.70 99.30 124.50 144.70 175.00 198.50 223.80 249.00 299.50
Gas Valve Type S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova
0.820.054 0.820.054 0.820.054 0.820.054 0.820.054 0.820.054 0.820.054 0.820.054 0.820.054
Part No L 431 L 431 L 431 L 431 L 431 L 431 L 431 L 431 L 431
LPG GAS
Injector Size N/A 7 x .54 7 x .54 7 x .54 7 x .54 7 x .54 7 x .54 7 x .54 7 x .54
Injector marking N/A 250 250 250 250 250 250 250 250
Propane Inlet Pressure - mbar N/A 37.0 37.0 37.0 37.0 37.0 37.0 37.0 37.0
Propane Inlet Pressure - in. w.c. N/A 14.8 14.8 14.8 14.8 14.8 14.8 14.8 14.8
*Propane Gas Rate m³/hr N/A 1.11 1.39 1.62 1.96 2.22 2.50 2.79 3.35
Propane Gas Rate kg/hr N/A 2.11 2.64 3.07 3.72 4.22 4.75 5.29 6.36
BUTANE
Butane Inlet Pressure - mbar N/A 29.0 29.0 29.0 29.0 29.0 29.0 29.0 29.0
Butane Inlet Pressure - in. w.c. N/A 11.6 11.6 11.6 11.6 11.6 11.6 11.6 11.6
*Butane Gas Rate M³/hr N/A 0.84 1.06 1.23 1.49 1.69 1.90 2.12 2.55
Butane Gas Rate kg/hr N/A 2.15 2.69 3.13 3.78 4.29 4.84 5.39 6.48
Gas Valve Type N/A S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova
0.820.054 0.820.054 0.820.054 0.820.054 0.820.054 0.820.054 0.820.054 0.820.054
(No Regulator) (No Regulator) (No Regulator) (No Regulator) (No Regulator) (No Regulator) (No Regulator) (No Regulator)
Part No L 431 L 431 L 431 L 431 L 431 L 431 L 431 L 431
Gas Connection Size R½R½R½R½R½R½R½R½R½

COMBAT®CUH UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
10
4.5 Technical Data Table - CUHA/A, CUHB/A, CUHC/A and CUHD/A Automatic Ignition Range
Appliance Category II 2H3+
Natural Gas Inlet Pressure 20 mbar (17 - 25)
Propane Inlet Pressure 37 mbar (25-45)
Butane Inlet Pressure 29 mbar (20-35)
*Gas rates corrected to standard conditions 1013.25 mbar 15°C
AUTOMATIC IGNITION
MODEL REFERENCE /A 60 /A 80 /A 100 /A 120 /A 140 /A 160 /A 180 /A 200 /A 240 A 280 /A 300 /A 340 /A 380
Heat Input Gross cv
kW 22.5 29.5 37 43 52 59 66.5 74 89 103 110 125 140
Heat Input Gross cv
Btu/hr 76770 100654 126244 146716 177424 201308 226898 252488 303668 351436 375320 426500 477680
Heat Input Net cv
kW 20.3 26.6 33.3 38.7 46.9 53.2 59.9 66.7 80.2 92.8 99.1 112.6 126.1
Heat Input Net cv
Btu/hr 69170 90689 113746 132191 159859 181379 204435 227492 273605 316644 338163 384277 430390
Approx. Heat Output
kW 17.78 23.31 29.23 33.97 41.08 46.61 52.54 58.46 70.31 81.37 86.90 98.75 110.60
Approx. Heat Output
Btu/hr 60648 79517 99733 115906 140165 159033 179249 199466 239898 277634 296503 336935 377367
Number of Burners 4 4 5 6 7 8 9 10 12 14 15 17 19
NATURAL GAS
Injector size 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94 7 x .94
Injector marking 840 840 840 840 840 840 840 840 840 840 840 840 840
Burner Pressure
mbar 6.9 10.6 10.2 10.0 10.6 10.5 10.5 10.5 11.5 11.0 12.1 11.0 11.4
Burner Pressure
in. w.c. 2.8 4.2 4.1 4.0 4.2 4.2 4.2 4.2 4.6 4.4 4.84 4.4 4.56
*Gas Rate - m³/hr 2.14 2.81 3.53 4.10 4.96 5.62 6.34 7.05 8.48 9.81 10.48 11.91 13.34
Gas Rate - ft³/hr 75.70 99.30 124.50 144.70 175.00 198.50 223.80 249.00 299.50 346.60 370.20 420.60 471.10
Gas Valve Type S.I.T.
Tandem
S.I.T.
Tandem
S.I.T.
Tandem
S.I.T.
Tandem
S.I.T.
Tandem
S.I.T.
Nova
S.I.T.
Nova
S.I.T.
Nova
S.I.T.
Nova
S.I.T.
Nova
S.I.T.
Nova Honeywell Honeywell
0.830.033 0.830.033 0.830.033 0.830.033 0.830.033 0.822.117 0.822.117 0.822.117 0.822.117 0.822.117 0.822.117 VR 420
AB 1002
VR 420
AB 1002
Part No L 411 L 411 L 411 L 411 L 411 L 421 L 421 L 421 L 421 L 421 L 421 L 059B L 059B
LPG GAS
Injector Size N/A 7 x .54mm 7 x .54mm 7 x .54mm 7 x .54mm 7 x .54mm 7 x .54mm 7 x .54mm 7 x .54mm 7 x .54mm 7 x .54mm 7 x .54mm 7 x .54mm
Injector marking N/A 250 250 250 250 250 250 250 250 250 250 250 250
PROPANE
Inlet Pressure - mbar N/A 37.0 37.0 37.0 37.0 37.0 37.0 37.0 37.0 37.0 37.0 37.0 37.0
Inlet Pressure - in. w.c. N/A 14.8 14.8 14.8 14.8 14.8 14.8 14.8 14.8 14.8 14.8 14.8 14.8
*Propane Rate - m³/hr N/A 1.11 1.39 1.62 1.96 2.22 2.50 2.79 3.35 3.88 4.14 4.70 5.27
Propane Rate - kg/hr N/A 2.11 2.64 3.07 3.72 4.22 4.75 5.29 6.36 7.36 7.86 8.93 10.01
BUTANE
Inlet Pressure - mbar N/A 29.0 29.0 29.0 29.0 29.0 29.0 29.0 29.0 29.0 29.0 29.0 29.0
Inlet Pressure - in. w.c. N/A 11.6 11.6 11.6 11.6 11.6 11.6 11.6 11.6 11.6 11.6 11.6 11.6
*Butane Rate - m³/hr N/A 0.84 1.06 1.23 1.49 1.69 1.90 2.12 2.55 2.95 3.15 3.58 4.01
Butane Rate - kg/hr N/A 2.15 2.69 3.13 3.78 4.29 4.84 5.39 6.48 7.50 8.00 9.10 10.19
Gas Valve Type N/A S.I.T.
Tandem
S.I.T.
Tandem
S.I.T.
Tandem
S.I.T.
Tandem S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova S.I.T. Nova Honeywell Honeywell
0.830.020 0.830.020 0.830.020 0.830.020 0.822.117 0.822.117 0.822.117 0.822.117 0.822.117 0.822.117 VR 420
AB 1002
VR 420
AB 1002
(No
Regulator)
(No
Regulator)
(No
Regulator)
(No
Regulator)
(No
Regulator)
(No
Regulator)
(No
Regulator)
(No
Regulator)
(No
Regulator)
(No
Regulator)
(No
Regulator)
(No
Regulator)
Part No L 413 L 413 L 413 L 413 L 421 L 421 L 421 L 421 L 421 L 421 L 059B L 059B
Gas Connection
Size R½R½R½R½R½R¾R¾R¾R¾R¾R¾ R1 R1

SECTION 4: SPECIFICATIONS
11
4.6 Gas Controls - Automatic Ignition
Gas control valves fitted are dependent upon the
model, each giving the same control elements as
follows. See Page 40, Figure 16 through Page 41,
Figure 19.
4.6.1 Main Gas Burner
The main gas valve contains
• Gas pressure regulator.
• Two automatic shut off valves.
When commissioned as defined on Page 38,
Section 11 through Page 43, Section 11.12 the
valves will have a step opening operation on the
main gas.
Settings of the valves are given on Page 42, Section
11.4.2 and in the tables on Page 9, Section 4.4
through Page 10, Section 4.5.
4.6.2 Pilot Gas Burner (Models 340 to 380 only)
There is one solenoid valve to control the pilot
burner gas supply which is designed to operate at
inlet pressure.
4.7 Gas Controls - Manual Ignition
The gas valve contains
• Main gas regulator.
• Safety gas valve controlled by the thermocouple.
• Solenoid valve to operate the main gas.
• Manual control knob and piezo electric igniter.
4.8 Main Fan
The main air moving fan(s) fitted to these heaters
are operated automatically by the fan thermostat
within the combination fan/limit thermostat. When
suitably connected to site wiring (See Page 21,
Section 10) the fan(s) may also be used for
distributing unheated air.
4.9 Limit Thermostats
There are two limit thermostats on these heaters to
protect them from overheating, should the fan fail.
One is within the combination thermostat and the
second is on the side of the heater towards the rear
of the heater.
NOTE: On models 340 and 380 B & C versions
there is a further secondary limit thermostat
protecting the third fan unit.
4.9.1 Honeywell Combination Fan/Limit
Thermostat (See Page 12, Figure 5)
The combination fan/limit thermostat is a dual
function control and safety device. Two of these are
fitted to CUHD versions, the second one is on the
inlet spigot at the rear of the heater.
Fan Thermostat
The fan thermostat controls the operation of the
main fan during the heater operation. It also ensures
that the main fan continues to run after the burner
turns off.
The white button on the fan thermostat should be
pulled to its “out” position for normal operation. In
the “pushed in” position the fan will run continuously.
Limit Thermostat
The limit thermostat operates in overheat conditions
caused by insufficient air passing over the heat
exchanger. This is a manual reset device and is
reset by pressing in the red reset button on the
thermostat.
4.9.2 Second Limit Thermostat
This is a manual reset device - See Page 7, Section
4.2.
NOTE: On CUHB and CUHC models 340 and 380
there are two of these fitted.
To reset this thermostat:
1. Remove the screw on cover of the thermostat
where it protrudes from the cabinet side.
2. Push in the button in the centre of the
thermostat.
3. Replace the cover.
4.10 Thermocouple Interrupter Relay
Manual ignition heaters are fitted with a
thermocouple interrupter relay to interface between
the limit thermostats and the thermocouple.
The limit thermostats provide a constant voltage to
the coil connections making the relay permanently
energised.
On interruption of the electrical supply to the relay,
the contact opens causing the safety valve to close.
The pilot will then need to be manually lit.
4.11 Automatic Ignition - Burner Control Box
4.11.1 Description of Burner Control Box
The fully automatic gas burner fitted to all CUHA/A,
CUHB/A, CUHC/A and CUHD/A models is
controlled by a Satronic DKG 972 or a Honeywell S
4563 control box. This control ensures the safe start
and stop sequence and also monitors the safe
presence of a flame. See Page 56, Figure 26.

COMBAT®CUH UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
12
Figure 5: Combination Fan/Limit Thermostat
Figure 6: Honeywell Control
Dial
Limit Hand
Fan Off Hand
Fan On Hand
Fan Terminals
Manual Fan Switch
(White)
BREAK-OFF LINK
MUST BE REMOVED
Limit Terminals
Limit Stat
Manual
Reset Button
(Red)
Push in Lock
Wire to Controlled Equipment
Push Screwdriver in
and hold to release
WARNING
Fire Hazard
Break-off link must be removed from replacement
thermostat.
Failure to follow these instructions can result in
death injury property damage or product damage.
S 4563 B Honeywell
Honeywell S4563 B Control Models 340 -380 only
Earth
4.8 x 0.8
Ignition
2.8 x 0.5
Flame Probe
6.3 x 0.8
Main Gas Valves
Start Gas Valve
Supply, Remote lockout signal & reset
S 4563 C Honeywell
Fan & air pressure switch
Connections ( linked out)
Supply, Remote lockout signal & reset Main Gas Valve
Earth
4.8 x 0.8
Ignition
2.8 x 0.5
Flame Probe
6.3 x 0.8
Honeywell S4563 C Control Models 60 -300

SECTION 5: HEATER INSTALLATION
13
SECTION 5: HEATER INSTALLATION
5.1 General
Heaters are designed for installation where by the
bottom panel of the heater is between 2.75m and
3.75m above the floor.
5.2 Handling
All CUH range heaters are supplied secured to a
wooden pallet and shrink wrapped.
Use the pallet to support the heater during handling
and installation.
5.3 Shelf Mounting and Suspension
The bottom panel is not intended to support the
weight of the heater. For typical suspension See
Page 13, Figure 7.
Figure 7: Suspension Methods
WARNING
Suspension Hazard
Support heater at all four
corners on the lower edge of
the side panels.
Use 10mm drop rod minimum.
Failure of the supports can
result in death injury
or property damage.
10 mm
Drop Rod
ut
Washer
ut
10 mm
Drop Rod
Washer
ut
Unistrut Channel ut
Cone Point
Set Pin
Window
Clamp
Unistrut
Lower Edge

COMBAT®CUH UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
14
SECTION 6: FLUE INSTALLATION
6.1 Flue Installation
Flues must be correctly sized for the model. See
Page 6, Section 4.1. Flues should be assembled as
on Page 5, Figure 2, on Page 5, Figure 3 and Page
14, Figure 8 through Page 15, Figure 11. The joints
between the flue 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 must be adequately supported so that the
heater does not bear the weight of the flue.
For straight and offset flue termination See Page 5,
Figure 2 and Figure 3.
90° bends and horizontal pipe must not be used
in flues. 135° bends are used to offset the flue as in
Figure 3.
Figure 8: Guy Wire Figure 9: Socket Direction
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 and property damage.
Over 2 m
use Guy Wires
Roof
Wall
Use adequate support to
prevent heater from carrying
the weight of the flue.
Male spigot
facing down.
Screws,
four typical.
Roof
Flue
Terminal
Conversion Collar -
last joint below
the roof line.
Male spigot
facing up.
Clamp Ring
Metal Sleeve
Masterflash
soaker flashing
or Rain Collar.