21
221138C
1 1 C o m m i s s i o n i n g
5048
Diagram 11.1
PRESSURE
GAUGE 'A'
5044
SWITCH 'ON'
SWITCH 'OFF'
Diagram 11.2
AUTOMATIC AIR
VENT CAP
4447 S
CENTRAL HEATING
SELECTOR SWITCH 'C'
CONTROL
RESET
NEON
11.1 Filling Domestic Water Circuit
Check that the boiler is isolated from the electrical
supply, at the external isolator.
Fully open the domestic water supply stop cock or valve
in the supply to the boiler.
Open the two domestic water isolation valves, slots in
line with the length of the valve, see diagram 8.1.
Open all hot water draw-off taps and close them when
water flows. Check for water soundness of the whole
domestic water system and boiler.
11.2 Filling the Heating System
It is essential that a bypass is fitted in all installations,
22mm o.d. minimum. The bypass must have a lockable
valves “B” in diagram 4.2, incorporated in a position so
that inadvertent closure or unauthorised interference is
not possible.
The bypass MUST be fitted before any system control.
A radiator bypass is not recommended.
Open the two central heating isolating valves, slots in
line with the length of the valve, see diagram 8.1.
Flush, fill and vent the system refer to Section 4.9
“Filling Sealed Systems”.
WARNING. SEVERAL COMPONENTS OPERATE
ON MAINS VOLTAGE AND WITH THE OUTER
CASE REMOVED, LIVE COMPONENTS BECOME
EXPOSED.
To assist in filling and venting, the pump may be
operated: Connect the electrical supply, set switch “C”
to “On”, any remote heating systems controls, time
switch and/or room thermostat to call for heat, see
diagram 11.1.
Note. If the clock/timer kit is to be fitted, refer to the
setting instructions in the Instructions for Use.
Make sure that the automatic air vent is operating
correctly, see diagram 11.2.
Take care not to splash any of the electrical components.
Alternate the position of switch “C” between “On” and
“Off” positions to ensure that water flows through all
parts of the boiler and air is not trapped in the boiler
internal bypass.
Pressurise the system until the pressure is 1.5bar
(21.5lbf/in2). Check the heating system and boiler for
water soundness.
Check the operation of the safety valve by turning the
safety valve knob in the direction of the arrow.
Lower the pressure to the initial cold fill design pressure,
refer to Section 1.6 “Data”. Position the set pointer on
the boiler pressure gauge at this pressure also.