Keston Combi 35kw User Manual download pdf (Page 8)

Keston Combi -

Installation and Servicing

general

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

installation pipework in accordance with BS6891:2005. Whilst the

principle of the 1:1 gas valve ensures the Keston Combi range

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 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.

Installation pipes must be tted 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 tted

to both ow 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 tted with a

room thermostat controlling the temperature in a space served by

radiators not tted 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 tted

with an automatic bypass valve to ensure a ow 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 20 & 21

A condensate drain is provided on the boiler. This drain must be

connected to a drainage point on site. All pipework and ttings 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”)

overow pipe. It is a universal tting to allow use of different

brands of pipework.

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Keston Combi 35kw User Manual Page 8

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