18
Classic RS -
Installation & Servicing
INSTALLATION
25 COMMISSIONING AND TESTING
A.
ELECTRICAL INSTALLATION
1. Checks to ensure electrical safety should be
carried out by a competent person.
2. ALWAYS carry out preliminary electrical
system checks, i.e. earth continuity, polarity,
resistance to earth and short circuit ,using a
suitable test meter.
B.
GAS INSTALLATION
1. The whole of the gas installation, including the meter,
MUST be inspected and tested for soundness, and
purged in accordance with the recommendations of
BS. 6891. In IE refer to I.S.813:2002.
2. Purging air from the gas installation may be
expedited by loosening the union on the gas service
cock on the boiler and purging until gas is detected.
3. Retighten the union and check for gas soundness.
WARNING. Whilst effecting the required gas soundness test and purging air from the gas installation,
open all windows and doors, extinguish naked lights and DO NOT SMOKE.
24 FROST PROTECTION
Central heating systems fitted wholly inside the house do not
normally require frost protection as the house acts as a 'storage
heater' and can normally be left at least 24 hrs. without frost
damage. However, if parts of the pipework run outside the house
or if the boiler will be left off for more than a day or so, then a frost
'stat should be wired into the system.
This is usually done at the programmer, in which case the
programme selector switches are set to 'Off' and all other controls
MUST be left in the running position. The frost 'stat should be
sited in a cold place but where it can sense heat from the system.
Wiring should be as shown, with minimal disturbance to other
wiring of the programmer.
Designation of the terminals will vary, but the programmer and
thermostat manufacturer's leaflets will give full details.
Diagram A shows a double pole frost 'stat, which should suffice
for all systems which do not use the 'OFF' terminals of the
programmer.
Diagram B shows a 'change-over' frost 'stat, which will cover
most systems which do use 'CH OFF.' If, however, on such a
system the HW pipework is in an isolated part of the house, a
second frost 'stat may be used to protect it. If in doubt, ask
your installer for advice.
The Benchmark Log Book or equivalent self certification should be completed and signed to demonstrate compliance with
Building Regulations.
INST
ALLA
TION
