It is recommended that a programmer and room thermostat control the boiler. Vaillant have a
range of optional easy fit controls available.
Thermostatic radiator valves must be installed, however they must not be fitted in a room where
the room thermostat is located.
NOTE:
All systems must have at least one radiator not fitted with a thermostatic valve.
NOTE:
For further information, see the current issue of the Building Regulations, approved
document L1, and the following current issues of:
1) Central heating system specification (CheSS) and
2) Controls for domestic central heating system and hot water. BRECSU.
3.11 Draining tap
A draining tap must be provided at all the lowest points of the system, which will allow the entire
system and hot water system to be drained.
Draining taps shall be to the current issue of BS 2879.
3.12 Safety valve
A safety valve need not be fitted to an open-vented system.
3.13 Bypass
A system bypass will be required fitted at least 1.5 metres away from the boiler, refer to the
current issue of central heating system specifications (CHeSS).
3.14 Pump specification
The pump should be fitted on the flow pipe from the boiler and have isolating valves each side.
3.15 Cleanser and inhibitor
In the case of an existing installation, it is ESSENTIAL that prior to installing the new boiler the
system is thoroughly flushed. For optimum performance after installation of a new system, the
boiler and its associated central heating system should also be flushed. Flushing should be
carried out in accordance with BS7593: 1992 using a cleanser.
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