COMBAT CUHA Guía
SUITABLE FOR: GB, IE, IT & ES
UNIT HEATERS
Installation, Commissioning,
Service & User Instructions
Models
CUHA, CUHB, CUHC & CUHD
60 to 240 (Manual Ignition)
CUHA/A, CUHB/A, CUHC/A & CUHD/A
60 to 380 (Automatic Ignition)
October 1999
Part No. X404C
Price £5.00
Page 1
UNIT HEATER
These 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:
Ireland (IE), Spain (ES), Italy (IT) & 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.
Page 2
UNIT HEATER
CONTENTS
The parts of this manual are numbered by section, clause and sub-clause. Hence 1:2:3 refers to Section
1, clause 2, sub clause 3. Figure numbers also follow this notation, hence Fig.2:3 is Section 2, Fig. 3.
SECTION
1. General Specification
2. Technical Data
3. Heater Installation
4. Commissioning of theAir Heater
5. Wiring Diagram
6. Servicing Instructions
7. Removal and Replacement of Parts
8. Fault Finding Charts
9. User Instructions
10. Conversion between natural gas and L.P.G
11. Parts List
12. Commissioning Data Sheet
THESEAIR HEATERSARE FOR USEWITH NATURAL GAS OR L.P.G ONLYAS STATED
ON THE HEATER DATA PLATE (Conversion between gasses must be carried out in accordance with section
10 of these instructions)
THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER OR NEAR THE HEATER
Note: Everyeffort ismade to ensurethat theinformation contained in this Manual is accurate. However,
Combat Engineering Ltd. reserves the right to alter specifications without prior notice.
Combat shall not be liable to rectify any defects or damage caused by any modifications made or
attempted to be made to the heating units by the customer, his servants, agents or employees.
WARRANTY: The Heat Exchanger has a ten year Warranty (subject to terms and conditions).
Page 3
UNIT HEATER
Section 1. GENERAL SPECIFICATION- CUH RANGE
l.l Basic Information
There are eight types of heater in the CUH... range covered by these instructions.
1. CUHA 60 to CUHA 240 Manual ignition with axial fans.
(22.5kW (76770 Btu/hr) to 89kW (303668 Btu/hr) Gross heat input)
2. CUHB 60 to CUHB 240 Manual ignition with centrifugal fans.
(22.5kW (76770 Btu/hr) to 89kW (303668 Btu/hr) Gross heat input)
3. CUHC 60 to CUHC 240 Manual ignition as CUHB but with the fans encased to allow inlet ducting.
(22.5kW (76770 Btu/hr) to 89kW (303668 Btu/hr) Gross heat input)
4. CUHD 60 to CUHD 240 Manual ignition without fan for installing into ducting.
(22.5kW (76770 Btu/hr) to 89kW (303668 Btu/hr) Gross heat input)
5. CUHA/A 60 to CUHA/A 380 Automatic ignition axial fans.
(22.5kW (76770 Btu/hr) to 140kW (477680 Btu/hr) Gross heat input)
6. CUHB/A 60 to CUHB/A 380 Automatic ignition ,with centrifugal fans.
(22.5kW (76770 Btu/hr) to 140kW (477680 Btu/hr) Gross heat input)
7. CUHC/A 60 to CUHC/A 380 as CUHB/A but with the fans encased to allow inlet ducting.
(22.5kW (76770 Btu/hr) to 140kW (477680 Btu/hr) Gross heat input)
8. CUHD/A 60 to CUHD/A 380 Automatic ignition, without fans for installing into ducting .
(22.5kW (76770 Btu/hr) to 140kW (477680 Btu/hr) Gross heat input)
Combat CUH... ranges of unitAir Heaters are type B11 appliances for vertical flue which are designed
to be suspended or shelf mounted.
These heaters are Cat II 2H3+ appliances for use with natural gas or L.P.G. as stated on the heater data
plate, and are intended for indoor installation only.
They must be installed in accordance with local regulations and the requirements of Section 3 of these
Instructions.
A permanent electrical supply of 230 volts 50 Hz, single phase is required for all models and all
models must be earthed.
ON/OFF,temperature and time control may be obtained by useof the Combat range of controlconsoles,
or by the use of individual controls as per the circuit diagrams in Section 5.
Page 4
UNIT HEATER
1.2 Heater Operation
1.2.1 Automatic Ignition Burner
Combat CUH.../A range warm air heaters are fitted with an automatic ignition control which ignites
the gas and monitors for the safe operation of the burner each time the external controls call for the
heater to operate.
1.2.2 Manual Ignition
Combat CUH... range heaters are fitted with a permanent pilot which requires manual ignition. Once
ignited the pilot remains alight so long as the thermocouple is detecting a flame. i.e. the multifunctional
control or isolating gas valve is not turned off and the electrical power supply is not interrupted.
1.2.3 Common Operation - All Heater Types
When the external controls call for heat, the burner operates to supply heat to the heat exchanger.After
approximately 2 or 3 minutes the air delivery fan will start to run, supplying warm air to the building.
When the external controls are satisfied they will turn off the burner leaving the fan running to cool
down the heat exchanger. When cool enough the fan thermostat will turn off the fan.
Note: For CUHD... versions supplied without a fan, for installation in ducting with a customer supplied
fan unit, it is essential that the control of the fan incorporates a system for allowing the fan to run on at
close down of the burner as described above.
WARNING
The electrical isolator should only be used in an emergency and should not be used for
closing down the burner, as this switches off the fan prematurely and may damage the heat
exchanger invalidating the warranty and causing a potential fire hazard.
Operating the electrical isolator on a CUH... manual ignition heater will also
turn off the pilot burner.
Page 5
UNIT HEATER
Fig 2.1 Dimensions etc. CUHA... 60 to 300
Gas Connection Access to Second
Limit Thermostat
WARNING !
Isolate Before
Removing Cover
Electrical Connections
for Main Fan, Gas
Valve and Interrupter
Relay
Lighting
Instructions
Data Plate
Electrical Supply via Cable
Gland
Pilot viewing
via cut out
Combustion
Air Slots
Honeywell
Combination Fan/
Limit Stat.
Burner
Compartment Air Deflection
Grille
Model
Ref. 60 80 100 120 140 160 180 200 240 280 300
A Width mm
(ins) 519
(20½) 519
(20½) 589
(23) 589
(23) 729
(28½) 729
(28½) 869
(34) 869
(34) 1009
(39¾) 1219
(48) 1219
(48)
B Support
Spacing mm
(ins) 479
(18) 479
(18) 549
(21¾) 549
(21¾) 689
(27¼) 689
(27¼) 829
(32¾) 829
(32¾) 969
(38¼) 1179
(46½) 1179
(46½)
C Flue Dia. mm
(ins) 178
(7) 178
(7) 178
(7) 178
(7) 178
(7) 178
(7) 229
(9) 229
(9) 254
(10) 254
(10) 254
(10)
Weight kg 91 91 110 110 130 130 150 150 190 200 200
Page 6
UNIT HEATER
Fig 2.2 Dimensions etc. CUHA... 340 to 380
Air Deflection GrilleBurner Compartment
WARNING !
Isolate Before
Removing
Cover
Lighting
Instructions
Electrical Supply
via Cable Gland
Access to Second
Limit Thermostat
Combustion
Air Slots
Data Plate
Gas
Connection
Pilot viewing
via cut out
Electrical
Connections for
Main Fan, Gas
Valve and
Interrupter Relay
Flue
Connections
Assembled on Site
Honeywell
Combina-
tion Fan/
Limit Stat.
Model
Ref.
340
380
A Width mm
(ins) 1359
(53½) 1499
(59)
B Support
Spacing mm
(ins) 1319
(52) 1459
(59)
C Flue Dia. mm
(ins) 305
(12) 305
(12)
Weight kg 210 210
Page 7
UNIT HEATER
Fig 2.3 Dimensions etc. CUHB... 60 to 300
Burner
Compartment
Electrical Supply
via Cable Gland
Access to Second
Limit Thermostat
Data Plate
Combustion
Air Slots
Lighting
Instructions
Pilot viewing
via cut out Gas
Connection
Electrical
Connections for
Main Fan, Gas
Valve and
Interrupter Relay
WARNING !
Isolate Before
Removing
Cover
Honeywell
Combina-
tion Fan/
Limit Stat.
Air Deflection
Grille
Model
Ref. 60 80 100 120 140 160 180 200 240 280 300
A Width mm
(ins) 519
(20½) 519
(20½) 589
(23) 589
(23) 729
(28½) 729
(28½) 869
(34) 869
(34) 1009
(39¾) 1219
(48) 1219
(48)
B Support
Spacing mm
(ins) 479
(18) 479
(18) 549
(21¾) 549
(21¾) 689
(27¼) 689
(27¼) 829
(32¾) 829
(32¾) 969
(38¼) 1179
(46½) 1179
(46½)
C Flue Dia. mm
(ins) 178
(7) 178
(7) 178
(7) 178
(7) 178
(7) 178
(7) 229
(9) 229
(9) 254
(10) 254
(10) 254
(10)
Weight kg 111 111 130 130 150 150 170 180 220 270 270
Page 8
UNIT HEATER
Fig 2.4 Dimensions etc. CUHB... 340 to 380
Air Deflection GrilleBurner Compartment
Electrical
Supply via
Cable Gland
WARNING !
Isolate
Before
Removing
Cover
Combustion
Air Slots Access to Second
Limit Thermostat
Data
Plate
Lighting
Instructions
Gas
Connection
Pilot viewing
via cut out
Electrical
Connections for
Main Fan, Gas
Valve and
Interrupter Relay
Honeywell
Combina-
tion Fan/
Limit Stat.
Model
Ref.
340
380
A Width mm
(ins) 1359
(53½) 1499
(59)
B Support
Spacing mm
(ins) 1319
(52) 1459
(59)
C Flue Dia. mm
(ins) 305
(12) 305
(12)
Weight kg 276 276
Flue
Connections
Assembled on Site
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