Supplied By www.heating spares.co Tel. 0161 620 6677
by a purpose designed guard. Terminal guards are available
from Quinnell, Barrett, and Quinnell, Old Kent Road, London.
State the model C2, [G.C. Part No 382946]
Where the terminal is fitted within 850 mm [34 in) of a pla-
stic or painted gutter or 450 mm [18 in) of painted eaves, an
aluminium shield at least 1,500 mm (59 in] long must be fit-
ted to the underside of the painted surface.
The air inlet outlet flue duct MUST NOT he closer than 25 mm
[1 in] to combustible material.
In certain weather conditions the terminal may emit a plume
of steam. This is normal but positions where this would cause
a nuisance should be avoided.
2.4
VENTILATION REQUIREMENTS
Detailed recommendations for air supply are given in
B55440: 2.
The following notes are for general guidance:
It is not necessary to have a purpose provided air vent in the
room or internal space in which the appliance is in installed.
2.5
GAS SUPPLY
The gas supplier should be consulted at the installation plan-
ning stage in order to establish the availability of an adequate
supply of gas.
An existing service pipe MUST NOT be used without prior con-
sultation with the gas supplier.
A gas meter can only be connected by the gas supplier or
their contractor.
An existing meter should be of sufficient size to carry the
maximum boiler input plus the demand of any other installed
appliance. (BS6891: 1988]. The gas required for the boiler is
specified in Table 4.
The governor at the meter must give a constant outlet pres-
sure of 20 mbar [8 in wg] for natural gas when the appliance
is running. The gas supply line should be purged.
NOTE: Before purging open all doors and windows, also
extinguish any cigarettes, pipes, and any other naked
lights.
The complete installation must be tested for gas soundness.
It is important to assure an adequate gas supply to the
appliance. No more than 3 m of 15 mm pipe should be used.
Where the supply exceeds 3 m the pipe should be suitably
sized only reducing to 15 mm for the last 3 m prior to the
appliance.
2.6
ELECTRICITY SUPPLY
The appliance MUST be earthed. A mains supply of 230V -
50 Hz single phase is required.
All external controls and wiring MUST be suitable for mains
voltage.
Wiring should he in 3-core PVC insulated cable NOT LESS
than 0.75 mm [24 x 0.2 mm] to BS6500, Table 16. Wiring
external to the boiler MUST be in accordance with current lEE
Wiring Regulations [B5 7671] and local regulations. The sup-
ply connection to the flying lead provided MUST be made to a
fused double pole switch, having a 3 mm [1/8 in] contact
separation in both poles, serving only the boiler and system
controls.
The fuse rating should be as per the original instructions. This
connection should be readily accessible and be made adja-
cent to the boiler. All fuses must be ASTA approved to BS
1362.
2.7
EXTERNAL CONTROLS AND COMPONENTS
The boiler is intended for use with a 230 V room thermostat.
The appliance requires a live feed from this to operate the
appliance and external circulating pump.
The pump MUST be wired to the appliance.
May need more notes when details are available.
The connection is made to the terminal block as described in
section 3.8.1
2.8
WATER SYSTEMS
2.8.1 General
This appliance is designed for connection to the following
types of indirect domestic systems:
– Fully pumped, sealed central heating systems.
– Fully pumped, open vented central heating systems.
The domestic hot water cylinder must be of the indirect type
with a separate feed and vent pipes. Single feed cylinders
must not be used.
The pump, including isolation valves, should be fitted in the
heating flow pipe from the appliance.
The pump should provide suitable flow to maintain an 11°C
temperature rise between the pumped flow and return pipes
connected to the appliance. Details of the appliance pressure
drop are provided in Table 4.
System drain cocks should be fitted at the lowest points in the
system in order to provide adequate drain points.
BS5442 provides information for the protection of the boiler
due to freezing. A frost thermostat should be fitted to the
system controls.
2.8.2 Requirements for open vented systems
A 22 mm copper vent pipe must be connected to the top of
the boiler flow pipe and terminate above the cold feed/expan-
sion tank. It must be suitably positioned to allow any dischar-
ge into the cold feed tank/expansion and must be on a conti-
nuous rise from the boiler flow pipe where it is connected.
The cold feed/expansion tank must have a capacity of at least
22 litres. The cold feed pipe from the cold feed/expansion
tank should be 15 mm copper.
The cold feed/expansion tank should have a lid. The bottom cold
feed/expansion tank must be no less than 1.2 m (one-point-two)
and no more than 30 m above the top of the appliance.
2.8.3 Requirements for sealed water systems
A sealed system must only be filled by a competent person
using one of the approved methods shown in fig. 3.
The system design should incorporate the connections appro-
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