COMBAT EPUA30 Guide

Heating Solutions Ltd
Unit Heaters
Installation and Commissioning Manual
Models: Elite Pro Unit A/B/C/D 30, 40, 50, 60,
75, 90, 100, 115
FOR YOUR SAFETY
If you smell gas:
• Open windows
• DO NOT try to light any appliance
• DO NOT use any telephone in your building
• Extinguish any open flame
• Leave the building
• Immediately call your local fuel supplier after
leaving the building.
• Follow the fuel supplier’s instructions
• If you cannot reach your fuel supplier, call the
Emergency Services
Combat Heating Solutions Ltd
Unit 20 Red Mill Trading Estate
Rigby Street
Wednesbury
West Midlands
WS10 0NP
Tel:[phone]
Email: [email protected]
Installer:
Please take 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
WARNING
FIRE HAZARD
Keep all flammable objects, liquids and vapours the minimum
required clearances to combustibles away from the heater.
Some objects will catch fire or explode when placed close to
the 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
Elite Pro EPU Range
Warm Air Unit
Heaters
CBT00013-1 Elite Pro Unit Heaters Installation and Maintenance Manual February 2023

Heating Solutions Ltd
CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023
2
TECHNICAL UPDATES
INFORMATION REGARDING UPDATES TO THIS MANUAL ARE LISTED BELOW AND SHOULD BE NOTED BEFORE
COMMENCING WITH ANY INSTALLATION WORK.
Date of Amendment Version No Page Description

CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023 3
UKCA & CE Declaration of Conformance
We declare that the following range of Combat Warm Air Unit Heaters:
Models: Elite Pro Unit Heaters 30,40,50,60,75,90,100,115
Have been designed and manufactured to satisfy the essential requirements following Directives and
Harmonised European Standards:
Gas Appliance Regulation 2020(S12020/676)
Energy Related Product Directive (ErP-Lot 21 Warm Air)2009/125/EC
Electrical Equipment (Safety) Regulations 2016 (EU Exit) Regulations 2019
Electro Magnetic Compatibility Regulations 2016 (EU Exit) Regulations 2019
BS EN 17082:2019
BS EN 55014-1:2017 + A1:2001 & A2:2008
(Category lV)
EN 61000-3-2:2014
EN 61000-3-3:2013
EC Type-examination Certificate Number:
UKCA/
EC Type-examination Certificate Number:
CE/
Report number:
Notified Body: Kiwa Gastec-0558 date 1 and Kiwa Gastec
Product Approval
Combat Heating Solutions Limited appliances have been tested and UKCA/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 with natural gas when installed, commissioned and
maintained in accordance with these instructions.
These instructions refer to gas appliances designed to operate in the UK and European Union. Appliances
designed for other countries (Non-European Union of the appliance are compatible).
2022 Combat Heating Solutions Limited
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 services - without written permission of
Combat Heating Solutions Limited.

Heating Solutions Ltd
CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023
4
1 Heater Safety 5
1.1 Manpower Requirements 5
1.2 Safety Labels 5
2 Installer Responsibility 6
2.1 Laminated Wall Plate 6
2.2 Corrosive Chemicals 6
2.3 National Standards 6
3 Clearances to Combustibles 7
3.1 Required Clearances to Combustibles 7
4 Critical Considerations 9
4.1 Ventilation 9
4.2 Gas Supply 9
4.3 Electrical Supply 9
4.4 Flue 9
5 Specifications 10
5.1 EPUA Unit heaters 10
5.2 EPUB, EPUC & EPUD Unit heaters 11
5.3 General Technical Data Table 12
6 Heater Installation 13
6.1 General 13
6.2 Basic Information 13
6.3 Location and Suspension 13
6.4 Handling 13
6.5 Suspension & Shelf Mounting 13
6.6 Wall Mounting 13
7 Flue Installation 15
7.1 Flue Installation 15
7.2 Type C12, C32, & C62 Appliances 15
7.3 Type B22 Appliances 15
8 Air Supply 17
8.1 Room Sealed 17
8.2 Open Flue 17
8.3 Building Ventilation 17
8.4 Isolated Equipment Rooms 17
9 Optional Configurations 18
9.1 Distribution Ductwork 18
9.2 EPUD Heaters 18
10 Gas Pipework 19
10.1 Connections 19
11 Wiring & Electrical Information 20
11.1 Electrical Supply 20
11.2 Remote Controls 20
11.3 Wiring Diagrams 21
12 Commissioning 23
12.1 Pre-Checks 23
12.2 Gas Supply 23
12.3 Mechanical Checks 23
12.4 Begin Commissioning 23
12.5 Combustion Testing 24
12.5.4 Turning Off The Heater 25
12.5.5 External Controls 25
12.5.6 Complete The Commissioning 25
12.5.7 Instructions To The User 25
13 User Instructions 27
13.1 User Instructions 27
13.2 Heater Operation 27
13.3 Burner Lockout Reset Button 27
13.4 Lighting Instructions 27
13.5 Simple Fault Finding 27
14 Servicing 28
14.1 Servicing Instructions 28
14.2 Burner Maintenance 28
14.3 Fan/Motor Assembly Maintenance 28
14.4 Heat Exchanger 28
14.5 Gas Control 28
14.6 Combustion Fan 28
14.7 Maintenance Check List 28
15 Fault Finding 30
15.1 General 30
16 Removal & Replacement Of
Parts 32
16.1 Gas Valve 32
16.2 Ignition/Detection Electrode 32
16.3 Ignition Control 32
16.4 Axial Fan 32
16.5 Centrifugal Fan/Guard/Motor Assembly 32
17 Wall Plate 40

CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023 5
1. 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 the heater
must be carried out by a registered installer/contractor
qualified in the installation and service of gas-fired
heating equipment.
Read all manuals supplied with the appliance carefully
before installation, operation, or service of this
equipment.
This heater is designed for heating only in 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, flueing, 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, such
as the various flue 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 installed and operated under the
general concepts of reasonable use and installed using
best building practices.
This appliance is not intended for use by persons
(including children) with reduced physical, sensory
or mental capabilities, or lack of experience and
knowledge, unless they have been given
supervision or instruction concerning the use of the
appliance by a responsible person for their safety.
Children should be supervised to ensure that they do
not play with the appliance.
For additional copies of the Commissioning, Operation
and Service Manual, or relevant burner and gas train
manuals, please contact Combat Heating Solutions
Limited.
Email: [email protected]
Web: www.combat.co.uk
1.1 Manpower Requirements
To prevent personal injury and damage to the heater, a
minimum of two persons will be required for installation.
1.2 Safety Labels
Product safety signs or labels should be replaced by the
product user when they are no longer legible. Contact
Combat Heating Solutions Limited for obtaining
replacement signs or labels.
1. Heater Safety

Heating Solutions Ltd
CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023
6
2. Installer Responsibility
2. Installer Responsibility
To install the heater, as well as the fuel and electrical
supplies, in accordance with applicable specifications
and regulations. Combat Heating Solutions Limited
recommends the installer contact a local building
inspector, Fire Officer or insurance company for
guidance.
• To use the information given in this manual together
with the local and national 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 the location of
supports, flues and air intakes.
• To provide access to all components 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 the heater
• To ensure that there is sufficient ventilation in the
area to comply with the requirements of all relevant
local and national regulations.
• To ensure the heater is placed in an approved
application.
2.1 Laminated Wall Plate
A laminated wall plate is available on request for
the heater as a permanent reminder of the safety
instructions and the importance of the required
clearances to combustibles.
A copy of the wall plate is illustrated on the back cover.
Know your model number and installed configuration.
The model number and installed configuration are found
on the burner and in the Installation, Commissioning,
Operation and Service Manual.
Write the largest clearance dimensions with permanent
ink according to your model number and configuration
in the open spaces on the plate
2.2 Corrosive Chemicals
Combat Heating Solutions Limited 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 on 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
Regulations
All appliances must be installed in accordance with the
latest revision available of all applicable standards and
local and national regulations including ventilation, gas
and electrical services.
Note: Additional standards for installations in public
garages, aircraft hangars, etc. may be applicable.
WARNING
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.

CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023 7
WARNING
FIRE HAZARD
Keep all flammable objects, liquids and vapours the minimum
required clearances to combustibles away from the heater.
Some objects will catch fire or explode when placed close to
the heater.
Failure to follow these instructions can result in death, injury
or property damage
• Keep petrol or other combustible materials including
flammable objects, liquids, dust or vapours away
from this heater or any other appliance.
• Do not spray aerosols in the vicinity of this appliance
• The stated clearances to combustibles represent
a surface temperature of 50°C (90°F) above room
temperature. Building materials with a low heat
tolerance (such as plastics, vinyl siding, canvas, tri-
ply, etc.) may be subject to degradation at lower
temperatures. It is the installer’s responsibility to
assure that adjacent materials are protected from
degradation.
• Maintain clearances from heat-sensitive equipment
and workstations.
• Maintain clearances from vehicles parked below
the heater.
• Maintain clearances from swinging and over-head
doors, overhead cranes, vehicle lifts, partitions,
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 maintain
required clearances from the heater to the
combustibles. Signs must be posted adjacent to the
heater thermostat. In the absence of a thermostat,
signs must be posted in a clearly visible location.
• Consult local Building Inspector, Fire Insurance
Carrier or other authorities for approval of proposed
installation when there is a possibility of exposure
to combustible airborne materials or vapours.
• Hang heater in accordance with the minimum
suspension requirements
• Affix the tag to a wall near the heater.
3.1 Required Clearances
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 7, 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 heater for the model
heater being installed to make sure the product is
suitable for your application and the clearances are
maintained. Read and follow the safety guidelines
below:
3. Clearances to Combustibles

Heating Solutions Ltd
CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023
8
The heater must always be installed at least 2.5m above the floor. The flue pipe must have clearance from
combustibles by 5cm.
If installed at low levels where individuals can touch hot heat exchanger components, adequate guarding must
be provided. All distances are minimum clearance requirements for service access, air flow and safety.
0.5m**0.5m
0.3m 0.15m
3m Clear 0.6m
0.15m
2.5m to 3.5m
3. Clearances to Combustibles
Figure 3
Heaters may be mounted at higher level if de-stratification
fans and/or downflow heads are installed
Figure 2

CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023 9
4.1 Ventilation
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 time and temperature controls in accordance
with Section 11.
4.4 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 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 wall or roof terminal.
4. Critical Considerations
WARNING
CARBON MONOXIDE HAZARD
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.
WARNING
FIRE HAZARD
Connect gas supply according to figure 11.
Do not use gas supply pipe and electrical connections to support
heaters weight.
Gas can leak if not installed properly
Failure to follow these instructions can result in death, injury or
property damage.
WARNING
ELECTRICAL SHOCK HAZARD
Disconnect electric before service.
This equipment must be properly earthed.
Failure to follow these instructions can result in death or electrical
shock.

Heating Solutions Ltd
CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023
10
5. Specifications
J
K
BF
E
H
AC 315
D
G
=
=
=
4 X M10 captive nuts
provided for connection of
threaded support rod or similar
Flue Outlet Spigot
Gas Supply
Connection
Combustion Air Intake Spigot
(Optional Extra)
Lockout Reset Switch
Access Door
Red LED
Green LED
Adjustable Outlet Louvres
Heater Top View
Heater Front View Heater Side View Heater Rear View
=
Electrical
Connection
Approximate position internally
of outgoing air / overheat sensor
Approximate position externally of
fan mounted incoming air sensor
5.1 EPUA Unit Heaters
Dimension data EPUA EPUA30 EPUA40 EPUA50 EPUA60 EPUA75 EPUA90 EPUA100 EPUA115
A Width mm 970 970 1077 1077 1511 1511 1758 1758
B Height mm 942 942 991 991 933 933 994 994
C Depth mm 555 555 650 650 650 650 650 650
D Overall depth mm 870 870 965 965 965 965 965 965
EGas connection height from
base mm 244 244 294 294 232 232 232 232
FGas connection from nearest
side mm 99 99 97 97 86 86 86 86
G Flue outlet height from base mm 123 123 133 133 125 125 135 135
H Flue outlet from nearest side mm 307 307 304 304 380 380 451 451
J Support spacing width mm 712 712 819 819 1187 1187 1435 1435
K Support spacing depth mm 409 409 464 464 464 464 464 464
Flue & air intake diameter mm 80 80 80 80 100 100 130 130
Weight kg 94 94 109 109 155 155 178 178

CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023 11
5.2 EPU Unit Heaters
5. Specifications
Dimension data EPUB, C & D EPU30 EPU40 EPU50 EPU60 EPU75 EPU90 EPU100 EPU115
L EPUB height mm 942 942 1064 1064 932 932 1012 1012
M EPUB depth mm 954 954 1051 1051 1112 1112 1112 1112
EPUC height mm TBA* TBA* TBA* TBA* TBA* TBA* TBA* TBA*
R EPUD depth mm 555 555 651 651 651 651 651 651
N Inlet & outlet spigot height mm 653 653 700 700 781 781 859 859
P Inlet & outlet spigot width mm 527 527 631 631 705 705 1238 1238
EPUB Weight kg
EPUC Weight kg
EPUD Weight kg
*Available on application

Heating Solutions Ltd
CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023
12
5.3 EPU Unit Heaters
5. Specifications
General technical data all
models EPUA30 EPUA40 EPUA50 EPUA60 EPUA75 EPUA90 EPUA100 EPUA115
Maximum heat input Gross CV kW 36.75 48.6 58.3 71.3 85.7 107.7 119 134
Maximum heat input
Net CV kW 33.10 43.78 48.01 64.23 77.20 97.02 107.20 120.72
Minimum heat input Gross CV kW 13.75 13.75 23.3 23.3 38 38 41 41
Minimum heat output kW 11.8 11.8 20 20 34 34 34 34
Max heat output kW 30 40 50 60 75 90 100 114
Gas connection EPUA
B,C,D ¾BSP ¾BSP ¾BSP ¾BSP ¾BSP ¾BSP ¾BSP ¾BSP
Gas consumption rates m³/h 3.5 4.6 5.6 6.8 8.2 10.3 11.3 12.8
EPUA with axial fan
Total electrical load w 547 547 596 596 960 960 1060 1060
Airflow m³/h 5200 5200 8200 8200 12000 12000 15000 15000
Sound pressure level at 3m TBA TBA TBA TBA TBA [62]
61.8 TBA TBA
EPUB with centrifugal fan and EPUC with centrifugal fan and duct inlet
Total electrical load w 1695 1695 3167 3167 3518 3518 5444 5444
Normal speed MID MID MID MID MID MID High High
Airflow m³/h 5800 5800 8500 8500 13000 13000 15300 15300
Sound pressure level at 3m TBA TBA TBA TBA TBA TBA TBA TBA
EPUD duct heater with no fan
Minimum airflow required m³/h 5200 5200 8200 8200 12000 12000 15000 15000
Pressure loss across heat
exchanger Pa TBA TBA TBA TBA TBA TBA TBA TBA
Flue and air intake
Flue and air intake size mm Ø 80 80 80 80 100 100 130 130
Maximum straight flue/air intake m 10 10 10 10 10 10 10 10
CO2 levels
CO2% at maximum rate 8.8 9.0 8.8 9.0 8.2 8.0 8.8 9.0
CO2% at minimum rate 8.0 8.0 8.0 8.0 9.2 9.2 8.0 8.0
G20 Gas rates
Max m³/h 36.75 48.6 58.3 71.3 85.7 107.7 119 134
Min m³/h 3.5 4.6 5.6 6.8 8.2 10.3 11.3 12.8
G31 Gas rates
Max m³/h 36.75 48.6 58.3 71.3 85.7 107.7 119 134
Max kg³/h 2.6 3.5 4.2 5.1 6.1 7.7 8.5 9.6
Max L/h 1383 1829 2194 2684 3226 4054 4479 5043
Max m³/h 1.4 1.8 2.2 2.7 3.2 4.1 4.5 5.0

CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023 13
6.1 General
Heaters are designed for installation above 2.5m.
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
EPU heaters have automatic ignition Premix fully
modulating burners.
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 or from wall brackets of sufficient strength
to support the heater as listed in the Dimension
Data Tables .
• 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.
6.4 Handling
All EPU heaters are supplied secured to a 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 evenly distributed prior to handling.
6.5 Suspension and Shelf Mounting
The gas or electrical supply lines must not be used to
support the heater.
Do not locate the gas or electric 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.
6.6 Wall Mounting
Where wall mounting brackets are to be used, any
bracket system to be installed must be of suitable
design to adequately carry the weights of the heater.
See Data tables for weights and dimensions.
Any mounting brackets utilised must be installed using
best building practices.
6. Heater Installation
WARNING
FALLING OBJECTS HAZARD
Use 10mm steel drop rod minimum
Failure of the supports can result in death, injury or property
damage

Heating Solutions Ltd
CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023
14
6. Heater Installation
WINDOW CLAMP
CONE POINT PIN
UNI-STRUT
UNI-STRUT
M10 THREADED ROD
M10 LOCKING NUT
M10 NUT
M10 NUT
M10 LOCKING NUT
M10 WASHERS
1X INTERNAL
1X ON UNDERSIDE
M10 THREADED ROD
M10 WASHER
M10 RIV-NUT
M10 LOCK NUT
M10 NUT
TOP OF HEATER
INTERNAL ANGLE
SUPPORT
ENSURE ALL SUSPENSION
HARDWARE IS TORQUED
TO A MINIMUM OF 27Nm

CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023 15
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 16,
Figure 7 and Figure 8. 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 25mm air gap.
Flues and air intakes must be adequately supported so
that the heater does not bear the weight of the pipes.
7.2 Type C12, C32 and C62 Appliance Room Sealed
(Down stream fan from heat exchanger)
Heaters are designed to be installed as room sealed
appliances. There are various options available to
achieve this such as using a special concentric terminal
or alternatively to run the flue and combustion air pipe
individually to and from outside. For special concentric
flue arrangements see page 16, figure 8.
7.3 Type B22 Appliance - Open Flue
The flue must terminate outside the building and be
fitted with a low resistance terminal.
7. Flue Installation
WARNING
FIRE HAZARD
Keep all flammable objects, liquids and vapours the minimum
required clearances to combustibles away from equipment.
Some objects will catch fire or explode when placed close to
equipment
Failure to follow these instructions can result in death, injury or
property damage.
WARNING
CARBON MONOXIDE HAZARD
Heater must be flued to outside.
Heater must be installed according to the installation manual.
Failure to follow these instructions can result in death or injury
WARNING
CUT/PINCH HAZARD
Wear protective gear during installation, operation and service.
Edges are sharp.
Failure to follow these instructions can result in injury.

Heating Solutions Ltd
CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023
16
Roof
Wall
Vertical Flue Arrangement
Horizontal Flue Arrangement
Flue Lengths
Masterflash
Masterflash
Open Flue Terminal
Open Flue Terminal
Suggested Minimum
From Fan Rear 0.3m
Flue sleeve by others,
see flue installation section
Flue sleeve by others,
see flue installation section
FlueModels
30-60
75-90
100-115
80mm Ø
100mm Ø
130mm Ø
Note:
When using a type C or D unit heater, the
actual flue configuration may need to be
different to that shown depending on the
proposed route of inlet ductwork.
7. Flue Installation
Figure 7
Figure 8
Roof
Wall
Horizontal Concentric Terminal
Pipe Lengths
Fixed External Plate
Plastic Cup (Cravat)
Vertical Concentric Terminal
Unfixed Internal Plate
Masterflash
Suggested Minimum
From Fan Rear 0.3m
Manifold Boot
Flue
Air Intake
Manifold Boot
90° Bend
Flue Spigot
(Fitted As Standard)
Air Intake Spigot
(Optional Extra)
The Minimum Gap
Must Be Positioned
At the Bottom
End View
Dim. A Dim. A
Dim. A
Dim B
Dim. A Dim. BFlueModels
30-60
75-90
100-115
80mm Ø
100mm Ø
130mm Ø
125mm Ø
150mm Ø
200mm Ø
0.5m
0.3m
0.4m
Note:
When using a type C or D unit heater, the
actual flue configuration may need to be
different to that shown depending on the
proposed route of inlet ductwork.
Manifold Boot

CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023 17
8.1 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).
8.2 Open Flued Installation
It is important to ensure that there is always an
adequate air supply for both combustion and heating
requirements in accordance with local and national
regulations.
8.2.1 heaters Installed Within the Heated Space
Where the volume of the heated space is greater than
4.7m3 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 will be necessary in accordance with
local and national codes. Ventilation direct to outside
must be provided as follows:
Heaters up to 70kW heat input: 5.0cm² per kW of
rated heat input. Heaters above 70kW heat input:
350cm² + 2.5cm² per kW of rated heat input above
70kW.
8.3 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 8.2.1 and local and national
regulations.
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
heater.
8.4 Isolated Equipment Room
Ventilation must prevent the isolated equipment room
temperature from exceeding 32ºC as well as prevent
any negative air pressure within the room. See Figure
9. Any isolated equipment room containing air heaters
will require permanent air vents direct to outside air in
compliance with local regulations.
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
heater.
8. Air Supply
Roof
Wall
High Level Ventilation
Low Level Ventilation
Return Air Duct From Heated
Space or Fresh Air Duct
From Outside
Duct Distribution System or
Discharge To Heated Space
Air
Flow
Figure 9

Heating Solutions Ltd
CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023
18
9.1 Distribution Ductwork for EPUB, C, D Heaters
EPUC heaters have the fans enclosed so that the
heater may be connected to inlet/outlet ducting.
EPUD heaters are supplied with inlet and outlet duct
spigots for mounting the heater into a customer
designed duct system for use with an external fan
system. It is a recommended that flexible duct
connectors are used to reduce duct born noises.
When installing EPUD heaters onto ducting the remote
fan when installed will be required to run on start up
of a run signal to the heater. The ignition control in the
heater will be preprogrammed with a fan run on start
up for “D” type heaters. The heater is pre-wired from
the 230v output from the ignition control (CON16) to
a relay which gives the installer a volt free contact as
required to energize an external contractor coil for
motor starter circuit (not supplied) see wiring diagram
on Page 22 as required to energize a contractor coil for
motor starter circuit (not supplied)
The distribution fan(s) remote start for operation with
out heat demand can be enabled with a remote switch
connected to the “SUMMER FAN” terminals (CON25)
see wiring diagram Page *** IMPORTANT connections
to enable SUMMER FAN are switching 24 ELV control
output and input signals any such remote enable circuit
must therefore be segregated from 230LV circuits
9.2 EPUD Heaters or EPUD heaters
It is essential that the airflow in the duct system is
at least that specified in the Data Sheet on Page 10
Section 5.3 and in the correct direction across the heat
exchanger as indicated by the arrow on the heater.
Higher airflows are permitted but will cause a lower
exit air temperature. It is recommended that the fan is
positioned to blow the air through the heat exchanger.
The duct must be designed as described to ensure
that there is a homogeneous air flow across the whole
of the heat exchanger.
Failure to provide suitable air flow properly distributed
across the heat exchanger will reduce the lifespan of
the heat exchanger.
The fan motor, or its control must contain a method of
overload protection. When installed remote from the
heater, the fan must be supplied via a local electrical
isolator positioned and properly labelled to prevent
inadvertent operation.
9. Optional Configurations
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.
Figure 10

CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023 19
10.1 Connections
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 gas supplier, to ensure that
the meter is adequate for the rate of gas required.
Installation pipes must be fitted in accordance with
local and national regulations. Pipework from the
meter to the heater(s) must be of adequate size for the
maximum kW load placed upon it.
Connect the heater to the gas supply ensuring that the
final connections are as follows:
Gas supply pipework is run in medium or heavy
gauge pipework in compliance with local and national
regulations.
• 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 soundness in accordance with
local and national regulations.
Check the pipe and all fittings for leaks before placing
heating equipment into service. When checking for gas
leaks, use a suitable leak detection solution; never use
an open flame.
10. Gas Pipe
WARNING
PRODUCT DAMAGE HAZARD
Hold gas nipple securely with pipe wrench when
attaching flexible gas connector.
Failure to follow these instructions can result in
product damage.
Gas Isolating Valve
Drip Leg
Cap
Union Connection
Gas Isolating Valve
Drip Leg
Cap
A
B
Important
Do not twist flexible gas connector.
Ensure all joints are gas tight.
Option A
Stainless steel flexible gas connector
Option B
For shelf fix mounting only using medium or
heavy gauge tubing
Figure 11

Heating Solutions Ltd
CBT0013-4 ELITE PRO UNIT HEATERS INSTALLATION AND SERVICING MANUAL FEBRUARY 2023
20
11.1 Electrical Supply
All heaters need a constant 230 V 50 Hz single phase
supply connected to terminals L, N & earth. Polarity
“L & N” must be correct. The voltage between neutral
and earth should be 0 volts and never exceed 15 volts.
All heaters and controls must be correctly earthed.
All external wiring must comply with the relevant IEE
and local regulations and be carried out by a qualified
electrician. External controls must have the same
constant 230 V 50 Hz supply.
Remote control wiring when required for lockout,
indication reset and summer fan will be 24V ELV and
must be segregated.
An isolator with a contact separation of at least 3mm
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.
External fuse protection must be sized in accordance
with electrical load requirements on page 12 Section
5.3.
EPUD heaters must have the external fan, with its
motor or its control connected to the 230v output
from the ignition control (CON6) so that the fan run-on
function operates correctly on shut down.
11.2 Remote Controls
The heater is designed to be operated by controls
installed remote from the heater. See Page 21 , Figure
11.3 for wiring details.
11.2.1 Burner Control (Thermostat)
Controls to operate the burner with all models:
connect controls between L1 & T/S
11.2.2 Positioning Room Thermostats or Combat
Control
A room thermostat or Combat control should
be mounted on a wall or column at a height of
approximately 1.5 meters from the floor to measure
the ambient temperature. It should be clear of both
cold draughts and the direct path of warm air from
the heater.
11.2.3 Remote Frost Thermostat
Controls to operate the burner, all models: connect
controls between L1 & T/S Locate within the heated
space adjacent to the most vulnerable equipment
that requires protection. See Page 21, Figure 11.3
11.2.4 Remote Fan Control
The fan will operate automatically providing there
is a constant 230 V supply to the main terminals.
A switch control to give remote fan run control can
be connected to the “SUMMER FAN” terminals see
wiring diagram page xx IMPORTANT connections to
enable SUMMER FAN are switching 24 ELV control
output and input signals any such remote enable
circuit must therefore be segregated from 230 LV
circuits all models 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 is not impaired
at shut down.
Remote Fan Controls ELV Circuit 24V
A switch or control wired between terminals on
CON25, in the terminal block will allow external
control of the fan(s).
See 24V ELV remote connection diagram 11.3 page
20. 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.
11.2.5 Remote Lockout Indication ELV circuit
24V
Remote lockout indication wired between terminals
on CON23. In the terminal block will give 24V output
to remote indications(s). See 24V ELV remote
connection diagram 11.3 page 21.
11.2.6 Remote Lockout Reset ELV circuit 24V
Remote lockout wired A switch or control wired
between terminals on CON 25. In the terminal black
will allow external control. See 24V ELV remote
connection diagram 11.3 page 21.
11. Wiring & Electrical Information