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1.8
AIR SUPPLY.
It is not necessary to have an air vent in the room or internal
space where the boiler is installed.
1.9
GAS SUPPLY
Consult the local gas supplier to establish an adequate supply
of gas. Do not use existing service pipes without consulting the
local gas supplier.
The gas supply must be governed with a meter.
A gas meter can only be connected by the local gas supplier or
by a Gas Safe Registered Engineer.
An existing meter should be checked, preferably by the gas
supplier, to ensure that the meter is adequate to deal with the
required gas supply rate.
It is the responsibility of the Gas Installer to size the gas
installation pipework in accordance with BS6891.
Whilst the principle of the 1:1 gas valve ensures the Logic
range is able to deliver it is full output at inlet pressures as low
as 14 mb, other gas appliances in the property may not be as
tolerant. When operating pressures are found to be below the
minimum meter outlet of 19 mb these should be checked to
ensure this is adequate for correct and safe operation.
Allowing for the acceptable pressure loss of 1mb across the
installation pipework, it can be assumed that a minimum
permitted operating pressure of 18mb will be delivered to the
inlet of the appliance.
(Reference BS6400-1 Clause 6.2 Pressure Absorption).
The external gas cock could further reduce the operating
pressure when measured at its test point. The pressure drop
is relative to the heat input to the boiler (kW), refer to graph
below.
IMPORTANT:
Ensure all gas valve connections are
gas tight with a gas soundness check up to the gas control
valve.
Installation pipes must be fitted in accordance with BS6891.
The complete installation MUST be tested for gas tightness
and purged as described, for the majority of installations the
appropriate standard is IGEM/UP/1B [23], but alternatively
IGEM/UP/1 [21] or IGEM/UP/1A [22], as appropriate, can be
utilized.
Gas Cock Pressure Drop
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
5
10
15
Heat Input to Boiler (kW)
10
Section 1 - General
20
25
30
35
40
1.10 WATER CIRCULATION SYSTEM
IMPORTANT:
A minimum length of 1 metre of copper
pipe MUST be fitted to both flow and return connections from
the boiler before connection to any plastic piping.
The central heating system should be in accordance with
BS6798 and, in addition, for smallbore and microbore systems,
BS5449.
Water treatment is covered later in these instructions.
Refer to Section
1.17
1.11 BOILER CONTROLS
System controls should be installed to ensure the boiler has
no demand when there is no requirement from the system, in
compliance with Building Regulations.
Heating systems utilising full thermostatic radiator valve control
of temperature in individual rooms should also be fitted with a
room thermostat controlling the temperature in a space served
by radiators not fitted with such a valve.
When thermostatic radiator valves are used, the space
heating temperature control over a living / dining area or
hallway having a heating requirement of at least 10% of the
minimum boiler heat output should be achieved using a room
thermostat, whilst other rooms are individually controlled by
thermostatic radiator valves. However, if the system employs
thermostatic radiator valves on all radiators, or two port valves,
then a bypass circuit must be fitted with an automatic bypass
valve to ensure a flow of water should all valves be in the
closed position.
1.12 ELECTRICAL SUPPLY
WARNING:
This appliance must be earthed
Wiring external to the appliance MUST be in accordance with
the current I.E.E. (BS7671) Wiring Regulations and any local
regulations which apply.
The mains supply to the boiler and system wiring centre
shall be through one common fused double pole isolator and
for new heating systems, and where practical replacement
installations, the isolator shall be situated adjacent to the
appliance.
1.13 CONDENSATE DRAIN
The condensate drain provided must be connected to the
drainage point on site. All condensate drainage pipework and
fittings must be made of plastic.
IMPORTANT:
The condensate drain pipework should
be installed in accordance with BS6798.
The drain outlet on the boiler is sized for standard 21.5 mm
overflow pipe. It is a universal fitting to allow use of different
brands of pipework.
Refer to Section
2.15
Installation and Servicing
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