21
221129A
HONEYWELL
1 1 C o m m i s s i o n i n g
SIT
Diagram 11.1
4322
SWITCH
'ON'
SWITCH
(OFF)
PRESSURE
GAUGE 'A'
CENTRAL
HEATING
SELECTOR
SWITCH 'C'
Diagram 11.1
2834
SWITCH
'ON'
SWITCH
(OFF)
PRESSURE
GAUGE 'A'
CENTRAL
HEATING
SELECTOR
SWITCH 'C'
PIEZO
BUTTON 'E'
OFF
PILOT/IGNITION
MAIN BURNER
PIEZO
BUTTON
'E'
GAS CONTROL
KNOB 'D'
GAS CONTROL
KNOB 'D'
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”, white flash showing, any remote heating
systems controls, time switch and/or room thermostat to
call for heat, see diagram 11.1.
Note. If the clock/timer is fitted into the boiler, refer to
the setting instructions in the Instructions for Use.
