COMBAT CTU-90 Guide

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. Extinguish any open flame.
6. Leave the building.
7. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
8. If you cannot reach your gas
supplier, call the Fire Department.
Fire Hazard
Keep all flammable objects, liquids and
vapours the minimum required
clearances to combustibles away from
heater.
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
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 in order to provide
your service technician with necessary information.
©2017 Combat HVAC Limited
Combat HVAC Limited
Unit 20 , Red Mill Trading Estate
Rigby Street,Wednesbury
West Midlands, WS10 0NP
Telephone: [phone]
Fax: [phone]
Service Telephone: [phone]
Service Fax: [phone]
E-mail: uksales@ combat.co.uk
E-mail: expor [e-mail]
www . combat.co.uk
Combat®
Installation, Commissioning,
Operation & Service Manual
Model CTU
75 to 115
P/N X408UK Orig. 09/14
Tubular Unit Heaters

© 2017Combat HVAC Limited
All rights reserved. Nopartof this work covered bythe copyrights herein maybereproduced
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 Combat HVAC Limited.
Printed in U.K.
TABLE OF CONTENTS
SECTION 1: Heater Safety ...................................................... 2
1.1 Manpower Requirements ............................................. 2
1.2 Safety Labels and Their Placement ............................. 2
SECTION 2: Installer Responsibility ..................................... 4
2.1 Laminated Wall Plate ................................................... 4
2.2 Corrosive Chemicals .................................................... 4
2.3 National Standards and Applicable Regulations.......... 4
SECTION 3: Clearances to Combustibles............................. 5
3.1 Required Clearances to Combustibles......................... 5
SECTION 4: Critical Considerations ..................................... 7
4.1 Ventilation .................................................................... 7
4.2 Gas Supply .................................................................. 7
4.3 Electrical Supply .......................................................... 7
4.4 Flue.............................................................................. 7
SECTION 5: Specifications .................................................... 8
5.1 CTUA .......................................................................... 8
5.2 CTUB, CTUC and CTUD ............................................. 9
5.3 General Technical Data Table ................................... 10
5.4 Technical Data Table .................................................. 11
SECTION 6: Heater Installation............................................ 12
6.1 General ...................................................................... 12
6.2 Basic Information....................................................... 12
6.3 Location and Suspension .......................................... 12
6.4 Handling .................................................................... 12
6.5 Suspension and Shelf Mounting................................ 12
SECTION 7: Flue Installation ............................................... 14
7. 1 F l ue Installation .......................................................... 14
7.2 Type C12, C32 & C62 Appliance..................................... 14
7.3 Type B22 Appliance ..................................................... 14
SECTION 8: Air Supply ......................................................... 16
8.1 Room Sealed Installation ........................................... 16
8.2 Open Flued Installation .............................................. 16
8.3 Building Ventilation .................................................... 16
8.4 Isolated Equipment Rooms........................................ 16
SECTION 9: Optional Heater Configurations...................... 17
9.1 Distribution Duct Work for CTUB, CTUC and CTUD
Heaters ...................................................................... 17
SECTION 10: Gas Pipe Work ................................................ 18
10.1 Connections ............................................................. 18
SECTION 11: Wiringand Electrical Information ................. 20
11.1 Electrical Supply ....................................................... 20
11.2 Remote Controls ....................................................... 20
11.3 CTUA Wiring Diagram (Models 75-115).................... 21
11.4 CTUB/C Wiring Diagram (Models 75-115)................ 22
11.5 CTUD Wiring Diagram (Models 75-115) ................... 23
11.6 CTUD External Motor Alternative Wiring & Optional
Thermostat/Time Switch............................................ 24
SECTION 12: Commissioning.............................................. 25
12.1 Pre-Commission Checks.......................................... 25
12.2 Gas Supply .............................................................. 25
12.3 Mechanical Checks .................................................. 25
12.4 Begin Commissioning .............................................. 26
12.5 Combustion Testing..................................................27
12.6 Turning Off the Heater..............................................27
12.7 External Controls......................................................28
12.8 Complete the Commissioning ..................................28
12.9 Instruction to the User..............................................28
SECTION 13: User Instructions............................................29
13.1 User Instructions ......................................................29
13.2 Heater Operation......................................................29
13.3 Common User Controls............................................30
13.4 Lighting Instructions .................................................30
13.5 Simple Fault Finding.................................................30
SECTION 14: Servicing.........................................................31
14.1 Servicing Instructions...............................................31
14.2 Burner Maintenance.................................................31
14.3 Fan/Motor Assembly Maintenance ...........................31
14.4 Heat Exchanger Maintenance ..................................32
14.5 Gas Control Valve Maintenance ...............................32
14.6 Flue Fan ...................................................................32
14.7 Maintenance Checklist .............................................32
SECTION 15: Conversion Between Gases ..........................34
15.1 General ....................................................................34
15.2 Burner Conversion ...................................................34
15.3 Gas Valves ...............................................................34
SECTION 16: Troubleshooting.............................................35
16.1 General ....................................................................36
16.2 Troubleshooting For Automatic Ignition Burner
Systems ...................................................................37
16.3 Troubleshooting for Flame Supervision System .......38
16.4 Troubleshooting for Solenoid Valves ........................38
SECTION 17: Removal and Replacement Parts..................39
17.1 Gas Valve..................................................................39
17.2 Burner Compartment................................................40
17.3 Ignition Electrode and Flame Probe..........................42
17.4 Flue Fan....................................................................43
17.5 Pressure Switch ........................................................44
17.6 Ignition Control..........................................................45
17.7 CTUA Axial Fan/Guard/Motor Assembly...................45
17.8 CTUB & CTUC Centrifugal Fan/Guard/Motor
Assembly ..................................................................45
17.9 Fan Data ...................................................................46

TABLE OF FIGURES
Figure 1: Side and Back Panel Label Placement...................... 2
Figure 2: Side Panel Label Placement...................................... 3
Figure 3: Installation Clearances and Clearances to
Combustibles ............................................................. 6
Figure 4: Suspension Methods ............................................... 13
Figure 5: Flue and Roof Detail ................................................ 14
Figure 6: Vertical and Horizontal Flue Termination -
Type B22 Appliance .................................................. 15
Figure 7: Vertical and Horizontal Flue Termination -
Type C12 C32 & C62 Appliances ................................. 15
Figure 8: Heaters Installed in Isolated Equipment Rooms ...... 16
Figure 9: Ducting..................................................................... 17
Figure 10: Gas Connection with Stainless Steel Flex
Connector .............................................................. 19
Figure 11: Sequence of Operation Chart ................................ 26
Figure 12: Gas Valve for Heater (Models 75 - 115) ................. 27
Figure 13: Heater Operating Sequence .................................. 29
Figure 14: Centrifugal Fan Orientation .................................... 46

1 of 46
Product Approval
ROBERTS GORDON® appliances have been tested and CE certified as complyin with the essential
requirements of the Gas Appliance Directive, the Low Volta e Directive, the Electroma netic
Compatibility Directive and the Machinery Directive for use on natural as and LPG when installed,
commissioned and maintained in accordance with these instructions.
These instructions refer to appliances desi ned to operate in the European Union.
Appliances desi ned 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 as distribution systems, nature of as and pressure, and
adjustment of the appliance are compatible.

COMBAT®CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
2 of 46
SECTION 1: HEATER SAFETY
Yo ur Safety is Important to Us!
This symbol is used throughout the
manual to notify youof 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-domestic
indoor spaces. Do not install in domestic spaces.
These instructions, the layout drawing, local codes
and applicable standards that apply to gas piping,
electrical wiring, venting, etc. must be thoroughly
understood before proceeding with the installation.
Protective gear is to be worn during installation,
operation and service. Thin sheet metal parts of the
heater and the various venting components have
sharp edges. To prevent injury, the use of work
gloves is recommended.
Before installation, check that the local distribution
conditions, nature of gas and pressure, and
adjustment of the appliance are compatible.
The heater must be applied and operated under the
general concepts of reasonable use.
This appliance isnot intended for use by persons
(including children) with reduced physical, sensory
or mental capabilities, orlack ofexperience and
knowledge, unless they have been given
supervision orinstruction concerning use of the
appliance by a person responsible for their safety.
Children should besupervised to ensure that they
do no play with the appliance.
For additional copies of the Installation, Operation
and Service Manual, please contact Combat HVAC
Limited.
1.1 Manpower Requirements
To prevent personal injury and damage to the
heater, two persons will be required for installation.
1.2 Safety Labels andTheir Placement
Product safety signs or labels should be replaced by
the product user when they are no longer legible.
Contact Combat for obtaining replacement signs or
labels. See Page 2, Figure 1 through Page 3,
Figure 2.
Figure 1: Side and Back Panel Label Placement
Description Part Number
Logo Label 91040030
Lockout Reset Label 91038303
Address Label 91040006
Rating Plate Label 91040001
Email: [email protected]
Email: [email protected]
Combat HVAC Limited
Unit 20 Red Mill Trading Estate
Rigby Street, Wednesbury
West, Midlands, WS10 0NP
www.combat.co.uk
Combat HVAC Limited
Email: [email protected]
Email: [email protected]
Combat HVAC Limited
Unit 20 Red Mill Trading Estate
Rigby Street, Wednesbury
West, Midlands, WS10 0NP
www.combat.co.uk
Combat HVAC Limited

SECTION 1: HEATER SAFETY
3 of 46
Figure 2: Side Panel Label Placement
Description Part Number
Lighting Instruction Label 91040002
Remote Reset Label 91040019
Terminal Label 91130301
Wiring Diagram Label 75-115 91040004

COMBAT®CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 2: INSTALLER RESPONSIBILITY
•To install the heater, as well asthe gas and elec-
trical supplies, inaccordance with applicable
specifications and regulations. Combat
recommends the installer contact a local
authority, building inspector or insurance
company for guidance.
•Touse the information given inthemanual
together with the local and national regulations
to perform the installation.
•To install the heater in accordance with the
clearances to combustibles ofthis heater.
•To apply allneeded materials not supplied
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 ofthis
installation, commissioning, operation and
service manual.
•To never use heater as supportfor 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 regulations.
•To safely and adequately install heater using
materials with a minimal working load of 33 kg.
•To ensure the heater is placed in anapproved
application.
2.1 Laminated Wall Plate
Alaminated wall plate is available for the heater as a
permanent reminder of the safety instructions and
the importance of the required clearances to
combustibles. Affix theplate by peeling off the
backing of the adhesivestrips on the rear surface
and position the plate on a wall near the heater (e.g.
thermostat or Combat®Controller).
Acopy of the wall plate (P/N 91040028) isillustrated
on the back cover.Knowyour model number and
installed configuration. Model number and installed
configuration are found on the heater and in the
Installation, Operation and Service Manual.
4 of 46
2.2 Corrosive Chemicals
Combat cannot be responsible for ensuringthat all
appropriate safety measures are undertaken prior to
installation; this is entirely the responsibility of the
installer. Itisessential 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 usedinrefrigerants, cleaning
agents, solvents, etc. Ifthese 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 isexposed to halogenated hydrocarbons.
2.3 National Standards and Applicable
Regulations
All appliances must be installed in accordance with
the latest revision of applicable standards and local
and national regulations. This refers also to the
electric, gas and venting installation. Note:
Additional standards for installations inpublic
garages, aircraft hangars, etc. may be applicable.
CAUTION
Product Damage Hazard
Do not use heater in area containing
corrosive chemicals.
Refer to appropriate Material Safety Data
Sheets (MSDS).
Failure to follow these instructions can result
in product damage.

SECTION 3: CLEARANCES TO COMBUSTIBLES
5 of 46
SECTION 3: CLEARANCES TO COMBUSTIBLES
3.1 Required Clearances to Combustibles
Clearances are the required distances that
combustible objects must be away from the heater
to prevent fire hazards. Caution should be used
when running the system near combustibles.
Combustibles are materials, which may catch on fire
and include common items such as wood, paper,
rubber, fabric, etc. Maintain clearances to
combustibles at all times for safety.
Clearances around the heater and flue must be as
indicated on Page 6, Figure 3 to ensure access for
servicing, and correct operation. If clearances to
combustibles are not indicated, then installation
clearances apply.
Check the clearances on each burner for the model
heater being installed to make sure the product is
suitable for your application and the clearances are
maintained. Read and followthe safety guidelines
below:
• Keep petrol or other combustible materials
including flammable objects, liquids, dust or
vapours away from this heater or any other appli-
ance.
• The stated clearances to combustibles rep-
resents a surface temperature of 32°C (90° F)
above room temperature. Building materials with
a lowheat tolerance (such as plastics, vinyl sid-
ing, canvas, tri-ply, etc) may be subject to degra-
dation at lower temperatures. It is the installer’s
responsibility to assure that adjacent materials
are protected from degradation.
• Maintain clearances from heat sensitive equip-
ment and workstations.
• Maintain clearances from vehicles parked below
the heater.
• Maintain clearances from swinging and over-
head doors, overhead cranes, vehicle lifts, parti-
tions, storage racks, hoists, building
construction, etc.
• In locations used for the storage of combustible
materials, signs must be posted to specify the
maximum permissible stacking height to main-
tain required clearances from the heater to the
combustibles. Signs must be posted adjacent to
the heater thermostat. In the absence of a ther-
mostat, signs must be posted in a conspicuous
location.
• Consult local Building Inspector, Fire Insurance
Carrier or other authorities for approval of pro-
posed installation when there is a possibility of
exposure to combustible airborne materials or
vapours.
• Hang heater in accordance to the minimum
suspension requirements on Page 12, Section 6
and Page 13, Figure 4.
• Affix the tag on a wall near the heater.
WARNING
Fire Hazard
Keep all flammable objects, liquids and
vapours the minimum required clearances to
combustibles away from heater.
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.

COMBAT®CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
6 of 46
Figure 3: Installation Clearances and Clearances to Combustibles
Wall
Terminal
Roof Terminal
Air
Intake
Flue 50 cm 50 cm**
30 cm
15 cm
Clearances to Combustibles
15 cm
2.5 3.5 m*
3 m
60 cm
Installation Clearances
If installed at lowlevels 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 flowand safety.
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.
* 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.

SECTION 4: CRITICAL CONSIDERATIONS
7 of 46
SECTION 4: CRITICAL CONSIDERATIONS
4.1 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.
4.2 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.
4.3 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 11.
4.4 Flue
Choose heater siting to allowfor the proper location
of the flue. Each heater must be fitted with an
individual and correctly sized sealed flue system
(See Section 7).
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.
WARNING
Carbon Monoxide Hazard
Heaters may be installed vented or unvented.
Vented heaters must be vented outdoors.
Unvented heaters must be installed in
buildings with ventilation rates as per
section 7.
Failure to follow these instructions can result
in death or injury.
DANGER
Electrical Shock Hazard
Disconnect electric before service.
Heater must be properly grounded.
Failure to follow these instructions can result
in death or electrical shock.

COMBAT®CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
8 of 46
SECTION 5: SPECIFICATIONS
5.1 CTUA
Dimension Data - CTUA (All Models)
Model 75 90 100 115
AWidth mm
(in)
1327
(52.3)
1327
(52.3)
1327
(52.3)
1327
(52.3)
BHeight mm
(in)
1100
(43.3)
1100
(43.3)
1345
(53)
1345
(53)
CSupport Spacing mm
(in)
627
(24.7)
627
(24.7)
627
(24.7)
627
(24.7)
DSupport Spacing mm
(in)
312
(12.3)
312
(12.3)
312
(12.3)
312
(12.3)
ESupport Spacing mm
(in)
388
(15.3)
388
(15.3)
388
(15.3)
388
(15.3)
FCentre of Flue mm
(in)
346
(13.6) 346 (13.6)
537
(21.1)
537
(21.1)
GCentre of Flue/Air Intake mm
(in)
225
(8.9)
225
(8.9)
225
(8.9)
225
(8.9)
HPosition of Flue mm
(in)
260
(10.2)
260
(10.2)
260
(10.2)
260
(10.2)
JGas Inlet Position mm
(in)
220
(8.7)
220
(8.7)
220
(8.7)
220
(8.7)
ZLength mm
(in)
756
(29.8) 756 (29.8) 806 (31.8) 806 (31.8)
Flue/Air Intake Pipe Size mm Ø
(in) Ø
130
(5.1) 130 (5.1) 130 (5.1) 130 (5.1)
Weight kg 160 169 194 203
Support
Centers
A
B
Rear View
End View
Z
646
168
Gas
Supply
F
G
H
Top View
J
ECD
77
Heater must be supported
at these points from above
or below.
492
4 x M10 Captive Nuts Provided
Lockout Reset
Electrical
Cable Entry
Air Intake
Flue

SECTION 5: SPECIFICATIONS
9 of 46
5.2 CTUB, CTUC and CTUD
Dimension Data - CTUB, CTUC and CTUD
NOTE: Inlet and outlet duct spigot fitted with 30 mm flange.
Model 75 90 100 115
KCTUB Depth mm
(in)
1076
(42.4) 1076 (42.4) 1076 (42.4) 1076 (42.4)
LCTUB Height mm
(in)
1100
(43.3) 1100 (43.3) 1380 (54.3) 1380 (54.3)
MCTUC Height mm
(in) 1100 (43.3) 1100 (43.3) 1431 (56.3) 1431 (56.3)
NInlet & Outlet Duct
Spigot Height
mm
(in)
1024
(40.3) 1024 (40.3) 1233 (48.5) 1233 (48.5)
PInlet & Outlet Duct
Spigot Width
mm
(in)
888
(35) 888 (35) 888 (35) 888 (35)
Weight CTUB kg 185 210 228 237
Weight CTUC kg 206 215 251 260
Weight CTUD kg 172 181 200 209

COMBAT®CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
10 of 46
5.3 General Technical Data Table
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 flowrequirements are not met, then temperature limit devices will shut down the heater.
Model CTU-75 CTU-90 CTU-100 CTU-115
CTUA With Axial Fan
Total Electrical Load W510 510 745 74 5
Run Current A1. 9 1. 9 3.2 3.2
Start Current A2.8 2.8 4.5 4.5
Air Flowm3/h 7500 7500 11,000 11,000
Sound Pressure Level at 3 m [NR] dB(A)
[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 W110 0 110 0 1650 1650
Normal Run Current A11. 0 11. 0 15.6 15.6
Normal Start Current A13.5 13.5 19.2 19.2
Normal Speed MediumMediumMediumMedium
High Run Current A14.0 14.0 21.0 21.0
High Start Current A17.2 17.2 25.8 25.8
Air Flowm3/h 6400 6400 9400 9400
Sound Pressure Level at 3 m [NR] dB(A)
[62]
61.8
[62]
61.8
[63]
64.2
[63]
64.2
CTUD Duct Heater with No Fan
**Minimun Air FlowRequired m3/h 6400 6400 9400 9400
Pressure Loss Across Heat Exchanger Pa 30 30 30 30
Flue and AIr Intake
Flue and Air Intake Size mm Ø 130 130 130 130
*Maximum Straight Flue/Air Intakem15 17 20 20

SECTION 5: SPECIFICATIONS
11 o f 46
5.4 Technical Data Table
Appliance Category II 2H/L 3B/P
Gas rates corrected to standard conditions 1013.25 mbar 15° C.
Model CTU-75 CTU-90 CTU-100 CTU-115
Heat Input
Gross CV
kW
(Btu/h) x (1000)
95
90.6
111
91.0
92.2
91.5
134
91.7
Heat Input
Net CV
kW
(Btu/h) x (1000)
86
292
100
341
107
365
121
414
Approximate
Heat Output
kW
(Btu/h) x (1000)
79
270
92
314
98
334
111
379
Thermostat Limit Thermodisc
CTUA,B/C,D °C 75 75 75 75
Natural Gas (G20) Data - Inlet Pressure 20 mbar (7.8in WG) Min. 17 mbar (6.8in WG) Max. 25 mbar (10 in WG)
Burner Pressure mbar 6.1 6.0 6.2 6.3
Gas Rate
m3/h
ft3/h
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 (7.8in WG) Max. 30 mbar (12 in WG)
Burner Pressure mbar 9.2 9.3 9.2 10.2
Gas Rate
m3/h
ft3/h
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 (18in 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 25.6 27.3 25.3 25.9
Gas Rate
m3/h
kg3/h
liquid/h
3.51
6.50
12.8
4.09
7. 58
14.9
4.39
8.13
16.0
4.97
9.21
18.1
LPG Gas Butane (G30) Data - Inlet Pressure 29 mbar (11,4 in WG) Min. 20 mbar (7.8in WG) Max. 35 mbar (13.8WG)
Burner Pressure mbar 18.3 19.4 18.3 18.7
Gas Rate
m3/h
kg3/h
liquid/h
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 Connection
CTUA,B/C,D R - 3/4" R - 3/4" R - 3/4" R - 3/4"

COMBAT®CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
12 of 46
SECTION 6: HEATER INSTALLATION
6.1 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. When handling or supporting the heater
from below, ensure that the weight is taken at the
support points.
6.2 Basic Information
CTU heaters have automatic ignition burners for
ON/OFF operation only.
6.3 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 dimension Data Tables on Page 8,
Section 5.1 and Page 9, Section 5.2 for support
points).
• May be suspended from above (See Page 13,
Figure 4) or from wall brackets of sufficient
strength to support the heater as listed in the
Dimension Data Tables on Page 8, Section 5.1
and Page 9, Section 5.2. Drop rods must be a
minimumof 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.
6.4 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.
6.5 Suspension and Shelf Mounting
For typical suspension See Page 13, Figure 4.
The gas or electrical supply lines must not be used
to support the heater.
Do not locate the gas or electrical supply lines
directly over the path of the flue products from the
heater.
The heater must be installed in a location that is
readily accessible for servicing.
The heater must be installed in accordance with
clearances to combustibles as indicated on the wall
tag and in this manual.
WARNING
Crush Hazard
Use 8 mm steel drop rod minimum.
Failure of the supports can result in death,
injury or property damage.

SECTION 6: HEATER INSTALLATION
13 of 46
Figure 4: Suspension Methods
10 mm
Steel
Drop Rod
Washer
Nut
Unistrut Channel Nut
Cone Point
Set Pin
Window
Clamp
Unistrut
10 mm
Steel
Drop Rod
Nut
Washer
Riv
Nut
Support Points
Insure all suspension hardware
is torqued to a minimum
of 27 Nm (20 ft lbs)

COMBAT®CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
14 of 46
SECTION 7: FLUE INSTALLATION
7.1 Flue Installation
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 14, Figure 5 through
Page 15, Figure 7. 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 14, Figure 5 through
Page 15, Figure 7.
7. 2 T y p e C 12, 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 15, Figure 7. The wire mesh be
fitted inside the fresh air adapter on the heater and
must be removed prior to installation.
7. 3 T y p e B 22 Appliance
The flue must terminate outside the building and be
fitted with a lowresistance terminal.
See Page 14, Figure 5 through Page 15, Figure 6.
Figure 5: Flue and Roof Detail
WARNING
Carbon Monoxide Hazard
Heaters installed unvented must be interlocked
with sufficient building exhaust.
Heaters must be installed according to the
installation manual.
Failure to follow these instructions can result
in death or injury.
WARNING
Fire Hazard
Keep all flammable objects, liquids and
vapours the minimum required clearances to
combustibles away from heater.
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
Cut/Pinch Hazard
Wear protective gear during installation,
operation and service.
Edges are sharp.
Failure to follow these instructions can result
in injury.
Roof
Flue
Terminal
Metal Sleeve
Masterflash
Soa er Flashing
or Rain Collar.
Flue
25 mm Air Gap to
Combustible Material