Gas Supply; Electrical Supply; Condensate Drain; Water Circulation System - Keston 30C Installation And Servicing Instructions

GAS SUPPLY

The local gas supplier should be consulted, at the installation
planning stage, in order to establish the availability of an
adequate supply of gas. An existing service pipe must NOT be
used without prior consultation with the local gas supplier.
The boiler MUST be installed on a gas supply with a governed
meter only.
A gas meter can only be connected by the local gas supplier or
by a Gas Safe Registered Engineer. In IE by a Registered Gas
Installer (RGII).
An existing meter should be checked, preferably by the gas
supplier, to ensure that the meter is adequate to deal with the
rate of gas supply required.
It is the responsibility of the Gas Installer to size the gas
Installer to size the gas installation pipework in accordance
with BS6891:2005. Whilst the principle of the 1:1 gas valve
ensures the Keston 30C is able to deliver its full output at inlet
pressures as low as 14mb, other gas appliances in the
property may not be as tolerant. When operating pressures are
found to be below the minimum meter outlet of 19mb 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 BS 6400-1 Clause 6.2
Pressure Absorption).
The integral appliance isolation valve and boiler pipework
could further reduce the operating pressure by up to 1.5mb
when measured at the inlet test point on the appliance gas
valve. Therefore it has been identified that an operating
pressure as low as 16.5mbar could be measured at the
appliance inlet pressure test point on the gas valve.
IMPORTANT.
Installation pipes must be fitted in accordance with BS.6891. In
IE refer to IS.813:2002.
The complete installation MUST be tested for gas tightness
and purged as described in the above code.

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
BS.6798 and, in addition, for smallbore and microbore
systems, BS.5449.
WATER TREATMENT - see Frame 5
BOILER CONTROL INTERLOCKS
Central heating systems controls should be installed to ensure
the boiler is switched off when there is no demand for heating,
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.
8
GENERAL
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.

ELECTRICAL SUPPLY

WARNING.
This appliance must be earthed.
Wiring external to the appliance MUST be in accordance with
the current I.E.E. (BS.7671) Wiring Regulations and any local
regulations which apply. For IE reference should be made to
the current ETCI rules for electrical installations.
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 boiler
installations, the isolator shall be situated adjacent to the
appliance.

CONDENSATE DRAIN

Refer to Frames 15, 25 & 48
A condensate drain is provided on the boiler. This drain must
be connected to a drainage point on site. All pipework and
fittings in the condensate drainage system MUST be made of
plastic - no other materials may be used.
IMPORTANT.
Any external runs must be in accordance with BS 6798.
The drain outlet on the boiler is sized for standard 21.5mm (3/4")
overflow pipe. It is a universal fitting to allow use of different
brands of pipework.
Keston 30C -
Installation and Servicing