Supplied By www.heating spares.co Tel. 0161 620 6677
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220692C
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SECTION
7
Completion and Commissioning
Heating System
Check that all remote controls are working as
required.
Allow the system to reach maximum working
temperature and examine for water leaks. The
boiler should then be turned off and the system
drained off as rapidly as possible whilst still hot.
Refill the system, vent and again check for water
soundness.
For sealed systems adjust to initial design pressure.
Any set pointer on the pressure gauge should be set
to coincide with the indicating pointer.
The overrun thermostat will keep the pump running
when the boiler shuts down, so long as the
temperature within the boiler is above a
predetermined level, providing the control
thermostat is set at maximum.
When commissioning the system the boiler should
be fired with the bypass fully closed on full service,
that is, central heating and domestic hot water. The
system should then be balanced, adjusting the pump
and lockshield valve as necessary. Having achieved
a satisfactory condition, operate the boiler with the
bypass closed on minimum load, normally central
heating only with one radiator operating in the main
living area. The valve should be opened gradually
to achieve the appropriate flow rate as quoted in
Section 2. If necessary readjust the pump.
Under NO circumstances should this valve be left in
the FULLY CLOSED position.
Operational Checks
Adjust the boiler thermostat and any system
controls to their required settings.
Do not attempt to adjust the thermostat calibration.
Operate the boiler again on full service and check
that the balancing is satisfactory, making further
adjustments as necessary to the system, radiator
valves and bypass.
On open vented systems there must be no pumping
over of water or entry of air at the vent above the
feed and expansion cistern.
If thermostatic radiator valves are fitted care must
be taken to ensure that there is an adequate flow rate
when the valves are closed. Refer to the current
issue of BS7478 on the use of thermostatic radiator
valves.
