Supplied By www.heating spares.co Tel. 0161 620 6677
17
COMMISSIONING AND TESTING
5
5.1
FILLING THE WATER SYSTEMS
25
Befor
e commissioning the appliance, the whole gas installation
including the meter MUST be purged and tested for gas tightness
in accordance with BS 6891: 1988.
IMPOR
TANT:
Open all doors and windows, extinguish naked
lights, and DO NOT SMOKE whilst purging the gas line.
Befor
e commencing the commissioning procedure, ensure that the
gas service cock is turned on, the electricity supply is isolated, and
that the DHW and CH pipework is complete.
A special feature of the Finest and Finest Gold is that the water
systems can be completely filled prior to fitting the boiler. It is
recommended that this procedure is followed even when the boiler
is to be fitted immediately after filling the system.
Fill the water systems by following the procedure detailed below
Fig 25, steps 1 to 5.
CENTRAL
HEATING
RETURN
COLD
WATER IN
CH
DRAIN
FILLING
LOOP
VALVE
CENTRAL
HEATING
FLOW
COMMISSIONING THE WATER SYSTEM
•
•
•
•
•
Note: It is r
ecommended, where possible, to flush the
CH system without the boiler fitted, to avoid debris
and flux blocking the plate heat exchanger.
1)
Check that the CH flow and r
eturn isolating valves are in the
open position.
2)
Fill the system with water using one of the appr
oved
methods described in section 3.6 to about 2.0 bar. Vent
the system via the radiator valves and system air vents in
accordance with normal practice. Ensure that all system
air vents are closed.
NOTE:
The boiler is supplied with a filling loop and fittings.
3)
Check the system for soundness.
4)
Check the operation of the pr
essure relief valve (Fig. 32) by
rotating the plastic head anticlockwise 1/4 of a turn and
checking that water is discharged. Ensure that the valve
seats correctly and does not leak. If the valve leaks or is
stuck closed replace it.
5)
Drain the entir
e system to flush out any debris, and refill to
0.2 bar above the system design pressure (between 0.5 and
1.5 bar) by repeating the above procedure. Follow the
commissioning procedure described below, then repeat this
instruction with the system hot. It is recommended that the
system is cleaned with a recognised system cleaner such as
Fernox or Sentinel.
6)
Open the DHW inlet valve and open and close each hot
water tap in turn to clear all the air from the pipes and
the boiler.
7)
Remove the pump vent cap to bleed any air fr
om the pump.
Using a screwdriver, rotate the pump shaft. Replace the cap.
Note:
When bleeding the pump, the flow switch, situated
beneath the pump, must be protected from water leakage, either
by covering it or temporarily removing it from the manifold –
Refer to section 9.10.
8)
If the filling loop has been used, disconnect it fr
om the system.
9)
Prior to lighting the boiler to check the gas rates, the Central
Heating and Boiler system should be checked for circulation
by running the boiler and pump with the gas turned off, to
ensure no air locks occur.
Boiler may go into ignition lock-out and require resetting.
