Ravenheat CSI85A(T) User guide

CSI 85 A (T)

3
CONDENSING SYSTEM INNOVATION AUTOMATIC MODULATING BOILER
FOR CENTRAL HEATINGAND DOMESTIC HOT WATER
This new super high efficient turbo-modulating boiler is designed to meet domestic hot water and central heating requirements
at super high efficiency, unheard of only a few years ago.
POSITION
The appliance is extremely versatile as it can be fitted in almost any room. The appliance is room sealed, there is no contact
between combustion chamber and living accommodation. This guarantees maximum safety and efficiency. Indeed, our
depression/combustion front cover has been designed to fit, achieving maximum air tight seal using screw down fasteners at
15 cm. This should not hinder service of the appliance, but does ensure maximum efficiency and safety - something which
Ravenheat take great pride in.
Each boiler has been designed and manufactured in our modern plant to exacting ISO 9001 discipline, all boilers carry full CE
marking of approval. Technical sales and commercial service are available throughout the UK. This product is guaranteed by
Ravenheat Manufacturing, Chartists Way, Morley, LEEDS, LS27 9ET. Telephone No [phone].
BASIC COMPONENTS - (See figure 1)
Guaranteeisafull12monthsfromdateofpurchaseprovidingtheappliancehasbeenfittedinaccordancewiththeseinstructions
and relevant codes of practice.
- Gas valve with flame modulator.
- Variable head pump suitable for any type of central heating system.
- Burner with flame stabiliser designed to operate under all thermal conditions.
- Primary heat exchanger constructed from copper.
- Unique patented condensing heat exchanger for high thermal flue transfer gases to water.
- Stainless steel plate heat exchanger for super high heat transfer to domestic hot water.
- Highly reliable diverter valve with ethylene propylene diaphragm permitting primary flow circulation
in the boiler during domestic hot water supply.
- Built in frost protection.
- Printed circuit board designed to connect to room stat and/or timer/frost stat.Aesthetically pleasing
panels and controls.
- On/Off ball valves for shutting off gas central heating and domestic hot water circuit Safety relief
valve (for safety discharge).
Programmable 7 day module with digital display (optional model).
All front panel controls not often used have been hidden. This achieves simplicity of operation with easy to clean
panels.
NOTE: Due to the high efficiency of this boiler a plume of water vapour will form at the flue
terminal during operation.
COSHH - CONTROL OF SUBSTANCES HARMFUL TO HEALTH
IMPORTANT
This appliance contains materials that are indicated below.
It is the Users/Installers responsibility to ensure that the necessary personal protective clothing is-worn when han-
dling, where applicable, the pertinent parts that contain any materials that cót3ld be interpreted as being injurious to
health and safety.
WARNING When installing the appliance, care should be taken to avoid any possibility of injury when handling sheet
metal parts.
GENERAL INFORMATION:
GLUES AND SEALANTS - exercise caution - if these are still in liquid form.
INSULATION PADS, CERAMIC FIBRE - may be harmful if inhaled, may be irritating to skin, eyes, nose and throat.
When handling keep dust generation to a minimum, avoid inhaling and contact with skin or eyes.
When disposing of the product keep dust generation to a minimum and ensure that parts are securely wrapped.
When servicing avoid inhalation by using a vacuum cleaner or in conjunction with other tools. After handling wash
hands and other exposed parts.
RAVENHEAT use only high quality material for production of this product, in an effort to protect the environment
components should be re-cycled.
MAJOR COMPONENTS

TABLE OF CONTENTS
SECTIONS
1
2
3
4
5
6
7
8
9
10
11
INTRODUCTION
DESIGN PRINCIPLES AND
OPERATING SEQUENCE
TECNICAL DATA
GENERAL REQUIREMENTS
INSTALLATION
COMMISSIONING
SERVICING INSTRUCTIONS
FAULT FINDING
ELECTRICAL SYSTEM DIAGRAM
EXPLODED PARTS DIAGRAM
LIST OF SPARE PARTS
PAGE
6
6
8-9
6
15
26
30
39
40
45
46
4
KEY
1 - Heat exchanger
2 - Heat exchanger for D.H.W water
3 - Burner
4 - Sensing electrode
6 - Condensing heat exchanger
9 - Ignition electrode
11 - Frame
12 - Modulating gas valve
15 - Heating control
22 - Overheat cut off thermostat
16-Hotwatercontrol
17-D.H.W. sensor
18-Waterpressureswitch(heatingcircuit)
23-Safetyreliefsystem
24-Three way valve
26-Autoairventvalve
28-Pressureswitch
29-Circulationpump
30-Waterpressuregauge
33 - Main switch
34 - C.H. sensor
35 - Condensing trap
36 - Fan
37 - Expansion tank
38 - Sealed chamber
45 - Combustion chamber
50 - Flue gas exhaust hood
105 - Timer
106 - Flue restriction ring

KEY
1 - Heat exchanger
2 - Heat exchanger for D.H.W water
3 - Burner
4 - Sensing electrode
5 - Flue restriction ring
6 - Condensing heat exchanger
8 - Condensing trap
9 - Ignition electrode
10 - Condensate sensor
12-Modulatinggasvalve
15-Heatingcontrolpotentiometer
16-Hotwatercontrolpotentiometer
17-Waterpressureswitch
18-Overheatcut-off thermostat
20-Gasservicecock
21-Compressionballvalves
23-Safetyreliefsystem
24-Three way valve
25-Flowregulator
26 -Auto air vent valve
27 - Pressure switch giving priority
28 - Pressure switch
29 - Circulating pump
30 - Water pressure gauge
36 - Fan
37 - Expansion tank
38 - Sealed chamber
5

SECTION 1 INTRODUCTION
1.1 The Ravenheat boiler is for the use of central
anddomestichotwatercombined in one unit.
It is fitted with an automatic domestic hot
water priority valve.
A / (winter/summer) selector
switch is fitted to the left hand side of control
panel.With the only (summer) position
being for domestic hot water.
position being for central heating
with domestic hot water priority. The boiler
is equipped with a front cover which can be
removed for servicing. The data badge with
technical data is placed on the lower right
hand side of the frame.
1.2 Fig.1 Illustrates the general layout of
components.
Fig.2 Illustrates the operating princi-
ples described in section 2.
SECTION 2
2.1 DESCRIPTION OF CONTROL SYSTEM
AND SEQUENCE OF OPERATION
2.2 Domestic hot water mode
When the appliance is in rest mode with
the mains neon and switch on.
Switch the summer/winter switch tap
position, with the heating circuit charged
with water (above 1 bar). If the domestic
hot water tap is turned on, the boiler will
function in the following sequence:
2.2.1 The pump starts.
The control board sensors.
The fan operates via the pressure switch and
sends a signal back to the ignition board that the
fan is running at maximum speed.
2.2.2 The spark ignition system is powered which in
turn commences the spark igniter to operate
and light the burner.
At this point the ignition board opens the gas
valve to light the burner.
2.2.3 When the electrode/sensor senses the signal
of the burner, the spark igniter stops.
2.2.4 From the minimum gas rate setting the
boiler increases to the maximum permissible
pressure over a period of 3 to 4 seconds and
will remain at its maximum required power
until its maximum regulated temperature.
2.2.5 When the domestic hot water tap is closed the
diverter valve goes back into rest mode, the
main burner is shut down along with the pump
and fan which are also switched off.
The pressure switch returns to its rest mode
2.2.6 Central heating mode
2.2.7 If the switch is positioned on with
a demand for heat to supply radiators,
6
etc ,with heating circuit fully so as to operate
thelowwatersensordevicetheboilerwillstart
in the same way as domestic hot water mode
but with slightly differing time delay in that it
will start on minimum and remain at this level
for about 1 minute, after which the flame will
lift to its maximum setting as governed by a
potentiometer range rates the heating circuit
between maximum and minimum power. As
the heating sensor reaches temperature the
gas burner power modulates down, the fan
speed willalsoreducetominimumfanspeed.
When starting, the fan will always start at
maximum speed.
2.2.8 On the control panel are mounted two
potentiometers (thermostats) these control
the temperature. One is for domestic hot
water and the other for heating.
2.2.9 The boiler is fitted with an anti-cycling device
on the control board. This delays the boiler
from re-firing over a 2/5 minute period when
in heating mode. The domestic hot water will
always take priority and is unaffected by the
anti-cycling device.
GENERAL FUNCTION
2.3 Central Heating Mode
2.3.1 A potentiometer installed on the electric circuit
board permits regulation of the boiler to partial
heating requirements, between maximum and
minimum settings.
2.3.2 Air is drawn by the fan for combustion.
2.3.3 Thefanalsoforcesexhaustgasthroughtheflue
to the outside, this creates a lesser pressure in
the sealed combustion chamber, thus sucking
in combustion air, through the inlet duct.
2.3.4 The boiler water temperature is automatically
controlled by a built in thermostat
2.3.5 Interior space temperature is set by the room
thermostat to be installed in the heating
system. The boiler already carries connection
terminals for this thermostat, as well as for a
timeclock.
The burner continues to operate until it is
stopped by the timer or one of the thermostats
2.3.6 When the internal C.H. temperature sensor
intervenes the main burner shuts down. The
fan stops but the pump continues to operate.
2.3.7 When the room thermostats intervene the
main burner shuts down. The fan stops and
the pump turns off.
2.3.8 The condensate trap is fitted with a blockage
safety sensor. This prevents the boiler
operating should there be a blockage in the
condensate discharge trap.

7
2.4 Domestic hot water mode
2.4.1 The heat exchanger in the D.H.W. circuit
is built into the main heat exchanger, and
domestic water is heated by converting
the water in the central heating circuit The
transference of heat is very high because the
two fluids move in a counter direction flow to
each other.
2.4.2 Switch 33 in the (winter) position.
Whenahotwatertapisturnedonadiaphragm
diverter valve excludes the central heating
circuit, the boiler automatically modulates to
maintain the domestic hot water at a constant
temperature.
Water temperature can be regulated using
the D.H.W. thermostat located on the front
control panel.
2.4.3 When domestic hot water is being drawn the
main burner and pump perform as they do
during central heating except that the burner
is commanded by the D.H.W. thermostat.
2.4.4 When D.H.W. is no longer called for the boiler
automatically returns to the central heating
mode.
2.4.5 Switch 33 in the (summer) position The
boilerfunctionslikeanautomaticgashotwater
heater When D.H.W. is no longer required the
main burner fan and pump immediately turn
off.
This also takes place when switch 33 is on
(winter) if there is no demand for
heat to the central heating system or until
the room thermostat/time clock demands for
central heating circuit.
3.1 SAFETY DEVICE
In both central heating and domestic hot
water mode safe operating is ensured by:
A differential pressure switch shuts off the
main burner if the fan stops or the flue or
combustion air intake duct is obstructed
3.1.2 An overheat cut off thermostat set slightly
higher than the high limit thermostat acts
to turn of the burner to resetable “lockout”
(Fig. 50) item 3.
3.1.3 A safety valve is fitted on the
central heating circuit set at
43 psi (3 bar).
3.2.1 A heating circuit (low water)
pressure switch is set at 0.4
bar.

NOMINAL HEAT INPUT NET QMS 22.6 kW
MINIMUM HEAT INPUT NET 11.6 kW
NOMINAL HEAT OUTPUT 22.3 kW
NOMINAL HEAT OUTPUT CONDENSING 23.9 kW
MINIMUM HEAT OUTPUT 11.4 kW
MINIMUM HEAT OUTPUT CONDENSING 12.3 kW
GAS RATE max 2.3 m3/h
AFTER 10 MINUTES min 1.2 m3/h
INLET PRESSURE 20 mbar
BURNER PRESSURE C.H. max 10.5 mbar
min 2.0 mbar
MAIN BURNER INJECTORS Nr. 13 x 1.25
ELECTRICAL SUPPLY 230 V ~ 50 HZ
POWER CONSUMPTION 150 W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE 2 A (20 mm to BS 4265)
DRY WEIGHT 51 kg
WATER CONTENT C.H. 2.1 litre
WATER CONTENT 0.5 litre
GAS SUPPLY CONNECTION 15 mm compression isolating valve
FLOW CONNECTION C.H. 22 mm compression isolating valve
RETURN CONNECTION C.H. 22 mm compression isolating valve
INLET CONNECTION D.H.W. 15 mm compression isolating valve
OUTLET CONNECTION D.H.W. 15 mm copper pipe
SAFETY DISCHARGE C.H. 15 mm copper pipe
CONDENSATION DRAIN 3/4” (21.5 mm) push fit over flow
MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL 110 LITRE
SEALED WATER SYSTEM C.H.
MAX PRESSURE PHS 2.5 bar
MINIMUM WORKING PRESSURE 0.5 bar
7 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar
CENTRAL HEATING OPERATING TEMPERATURE MAX 85°C MIN 45°C
DESIGN FLOW RATE 1102 I/h 20 °C RISE
MINIMUM FLOW RATE C.H. 503 I/min
D.H.W. FLOW RATE 30 °C rise 12.3 l/min
D.H.W. FLOW RATE 35 °C rise 10.5 l/min
D.H.W. FLOW RATE 40 °C rise 9.2 l/min
D.H.W. TEMPERATURE max 65 °C min 35 °C
BURNER PRESSURE D.H.W. max 11.2 mbar min 2.0 mbar
Qmw Input Net max 26 kW min 11.6 kW
D.H.W. PRESSURE max 10 bar (147 p.s.i.)
D.H.W. PRESSURE PMW min 0.8 bar (118 p.s.i.) To obtain heat input 1.2 bar
D.H.W. MINIMUM FLOW RATE 3 I/min
FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers
DESTINATION: AT, DK, Fl, SE, CATEGORY I2H
DESTINATION: GB, IE, CH, ES, IT, PT CATEGORY II2H3+
FLUE TYPE - C12 - C32 - C52 NOX 4
SECTION 3 TECHNICAL DATA CSI 85 A (T)
TABLE 1 NATURAL GAS (G 20) І2H - П2H3+
8

SECTION 3 TECHNICAL DATA CSI 85 A (T)
TABLE 1/A LPG (G 30 - G 31) І3+ - П2H3+
NOMINAL HEAT INPUT NET QMS 22.6 kW
MINIMUM HEAT INPUT NET 11.6 kW
9
NOMINAL HEAT OUTPUT 22.3 kW
NOMINAL HEAT OUTPUT CONDENSING 23.9 kW
MINIMUM HEAT OUTPUT 11.4 kW
MINIMUM HEAT OUTPUT CONDENSING 12.3 kW
GAS RATE max G31 0.9 m3/h G30 0.7 m3/h
AFTER 10 MINUTES min 0.4 m3/h 0.3 m3/h
INLET PRESSURE G31 37mbar G30 28-30 mbar
BURNER PRESSURE C.H. max G31 35.4mbar G30 27.3 mbar
min 7.3 mbar 7.0 mbar
MAIN BURNER INJECTORS Nr 13 x 0.75
ELECTRICAL SUPPLY 230 V ~ 50 HZ
POWER CONSUMPTION 150 W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE 2 A (20 mm to BS 4265)
DRY WEIGHT 51 kg
WATER CONTENT C.H. 2.1 litre
WATER CONTENT 0.5 litre
GAS SUPPLY CONNECTION 15 mm compression isolating valve
FLOW CONNECTION C.H. 22 mm compression isolating valve
RETURN CONNECTION C.H. 22 mm compression isolating valve
INLET CONNECTION D.H.W. 15 mm compression isolating valve
OUTLET CONNECTION D.H.W. 15 mm compression
SAFETY DISCHARGE C.H. 15 mm copper pipe
CONDENSATION DRAIN 3/4” (21.5 mm) push fit over flow
MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL 110 LITRE
SEALED WATER SYSTEM C.H.
MAX PRESSURE PHS 2.5 bar
MINIMUM WORKING PRESSURE 0.5 bar
6 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar
CENTRAL HEATING OPERATING TEMPERATURE MAX 85°C MIN 35°C
DESIGN FLOW RATE 1102 I/h 20 °C RISE
MINIMUM FLOW RATE C.H. 503 I/min
D.H.W. FLOW RATE 30 °C rise 12.3 l/min
D.H.W. FLOW RATE 35 °C rise 10.5 l/min
D.H.W. FLOW RATE 40 °C rise 9.2 l/min 10°C inlet temperature
D.H.W. TEMPERATURE max 65 °C min 35 °C
BURNER PRESSURE D.H.W. MAX G31 35.4 - G30 27.3 mbar
MIN G31 7.3 - G30 7.0 mbar
Qmw Imput Net MAX 22.6 Kw - MIN 11.6 Kw
D.H.W. PRESSURE max 10 bar (147 p.s.i.)
D.H.W. PRESSURE PMW min 0.8 bar (11.8 p.s.i.) To obtain heat input 1.2 bar
D.H.W. MINIMUM FLOW RATE 3 I/min
FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers
DESTINATION: BE, FR CATEGORY I2H+
DESTINATION: GB, IE, CH, ES, IT, PT CATEGORY II2H3+
FLUE TYPE - C12 - C32 - C52 NOX 4

10
The manufacturer’s notes must NOT be
taken, in any way, as overriding statutory
obligations.
IMPORTANT:
These appliances are CE certificated for
safety and performance. It is, therefore,
important that no external control devices e.g.
flue dampers, economisers etc., are directly
connected to this appliance unless covered by
these Installation and Service Instructions or
as otherwise recommended by Ravenheat in
writing. If in doubt please enquire.
Any direct connection of a control device
not approved by Ravenheat could invalidate
the certification and the normal appliance
warranty.
Itcouldalsoinfringe the Gas Safetyregulations
and the above regulations.
NOTE:
The Ravenheat CSI 85 combination boiler
has been tested and examined by BG, and is
certified to comply with PrEN 483 and BS EN
625.
Manufactures instructions must NOT be taken
in any way as overriding statutory obligations.
If in doubt on any point please consult
Ravenheat Manufacturing Ltd.
4.2 LOCATION OF BOILER
4.2.1 Siting of Ravenheat CSI 85 Combi Boiler must
be as follows.
The position of installation should be within
the building, unless otherwise protected by a
suitable enclosure.
Adequate space for installation, servicing and
air circulation around boiler must be allowed
for.
The Ravenheat CSI 85 Combi Boiler must
be fitted on a flat and vertical wall capable of
adequately supporting the weight of the boiler
and any ancillary equipment.
Theappliancemaybeinstalledonacombustible
wall subject to the requirements of the Local
Authority and Building Regulations.
LPG versions of this appliance shall not be
installed in cellars or basements.
4.3 CLEARANCES AROUND THE APPLIANCE
4.3.1 The following minimum free spaces, required
for installation inspection and servicing, must
be left around the boiler
18 inches (450 mm) in front
5 inches (125 mm) above
6 inches (150 mm) below
0.2 inches (5 mm) on each side
1 inch (25 mm) in front when installed in a
cupboard.
SECTION 4 GENERAL REQUIREMENTS
4.0.1 SAFETY
Gas Safety (Installation and Use)
Regulations, 1994 and amended 2000.
It is law that all gas appliances are installed
and serviced by a CORGI registered installer
in accordance with the above regulations
and these installation instructions. All CORGI
registered installers carry a CORGI I.D. card
and have a registration number. Both should
be recorded in your boiler log book. You can
check your installer by calling CORGI direct
on:01256732300. Failuretoinstall appliances
correctly could lead to prosecution. It is in
your own interest, and that of safety, to ensure
the law is complied with. Check the boiler
and flue is the correct type for installation.
The installation of the boiler MUST be
in accordance with the latest I.E.E. (BS
7671) Wiring Regulations, local building
regulations, bye-laws of the local water
authority, the building regulations and the
Building Standards (Scotland) and any
relevant requirements of the local authority.
4.1 GENERAL INFORMATION
Both the user and the manufacturer rely
heavily on the installer, whose job it is to
install the combination boiler and connect
it to a correctly designed heating system.
Acquaint yourself with the British Standards
concerning installation requirements. If you
need advice on any points your Ravenheat
Technical Services Office would be pleased to
help. It is recommended that tools suitable for
brass fittings are used, and have a capability
to accomodate hexagon sizes up to 50 mms.
CODES OF PRACTICE/Ref: Documents
Detailedrecommendationsarecontainedinthe
following British Standard Codes of Practice:
BS.6891 Low pressure installation pipes.
BS.6798 Installation of gas fired hot water
boilers of rated input not exceeding
60 kW.
BS.5449 Forcedcirculationhotwatersystems.
BS.5546 Installation of gas hot water supplies
domestic purposes (2ndFamily
Gases).
BS.5440:1 Flues (for gas appliances of rated
input not exceeding 60 kW).
BS.5440:2 Ventilation (for gas appliances of
rated input not exceeding 60 kW).
DD 189: 1990 Discharge of condensate.
Health & Safety Document No.635
The Electricity at Work Regulations, 1989.

11
4.4 IMPORTANT NOTICE
4.4.1 If the combination boiler is to be fitted in a
timber framed building it should be fitted in
accordance with the British Gas Publication
Guide for Gas Installations in Timber Frame
Housing Reference DM2 If in doubt advice
must be sought from the local gas supplier The
combination boiler may be installed in any room
or internal space, although particular attention
is drawn to the requirements of the current
I.E.E. Wiring Regulations, and in Scotland the
electrical provisions of the Building Regulations
applicable in Scotland, with respect to the
installation of the combination boiler in a room
or internal space containing a bath or shower.
Where a room sealed appliance is installed
in a room containing a bath or shower, any
electrical switch or appliance control, utilising
mains electricity should be so situated that it
cannot be touched by a person using a bath or
shower.
Acompartmentusedto enclosethecombination
boiler MUST be designed and constructed
specifically for this purpose. An existing
cupboard, or compartment, may be used
provided it is modified accordingly Samples
of the CSI combination boiler have been
examined by B.G. Technology Notified Body,
and is certified to comply with the essential
requirements of the Gas Appliance
Directive 90/396/EEC, the Low Voltage
Directive 72/23/EEC and shows compliance
with the Electro Magnetic Compatibility
Directive 89/336/EEC and are therefore
permitted to carry the CE Mark.
The appliance has been tested and approved
by the WRc as meeting the requirements of
G3 and L of the Building regulations and water
Bylaws Scheme - Approved Products.
4.5 GAS SUPPLY
4.5.1 A gas meter is connected to the service pipe
by the Local Gas Region or the Local Gas
Region contractor. An existing meter should
be checked preferably by the Gas Region to
ensure that the meter is adequate to deal with
the rate of gas supply required for all appliances
it serves. Installation pipes should be fitted in
accordance with BS 6891. Pipework from the
meter to the boiler must be of adequate size
(22 mm) min To within at least 3 metre of
the boiler (15 mm) min. can then be used for
remaining pipe work to the appliance. A smaller
size than the boiler inlet gas connection should
not be used The complete installation must be
tested for soundness as described in the above
Code
N.B. if the gas supply for the boiler serves
other appliances ensure an adequate
supply is available both to the boiler and the
other appliances when they are in use at the
same time.
4.6 FLUE SYSTEM
4.6.1 The terminal should be located where dispersal
of combustion products is not impeded and with
due regard for the damage or discolouration
that might occur to building products in the
vicinity (see fig. 6).
The terminal must not be located in a place
where it is likely to cause a nuisance In cold
and/or humid weather water vapour may
condense on leaving the flue terminal.
The effect of such steaming must be
considered
The terminal must not be closer than 25 mm (1
in) to any combustible material For protection
of combustibles, refer to BS 5440.1.
Where a flue terminal is installed less than
1000 mm. from a plastic, or painted gutter;
or 500 mm from painted eaves, an aluminium
shield 1000 mm. long, should be fitted to the
underside of the gutter or painted surface.
Pluming will occur at the terminal so, where
possible, terminal positions which could cause
a nuisance should be avoided.
The flue must be installed in accordance with
the recommendations of BS 5440: Part 1.
IMPORTANT NOTES
For greater flue lengths see twin flue instruc-
tions.
Flue must be positioned in a place not likely
to cause a nuisance.
IMPORTANT: The following notes are intended for
general guidance
The boiler MUST be installed so that the terminal
is exposed to external air.
It is important that the position of the terminal al-
lows the free passage of air across it at all tirnes.
Minimum acceptable spacing from the terminal to
obstructions and ventnation opening are specified
in Fig. 6.
Note positions: Due to the terminal design,
installation is possible with clearances less than
those specified in BS 5440, Part 1