40
Henrad CC FF
- Installation
63 GAS CONTROL VALVE REPLACEMENT - continued
64 WATER PRESSURE GAUGE
5. Unscrew the nut securing the
capillary at the CH flow pipe boss
and withdraw.
6. Squeeze the tabs to release the
pressure gauge.
7. Fit the replacement gauge and
reassemble in reverse order.
8. Close all drain cocks and open
both isolating valves.
9. Fit the filling loop. Fill the boiler
with water and pressure to 1 bar
(as appropriate). Reconnect
services.
10. After satisfactory test firing and
removal of air from the system
remove the filling loop.
1. Disconnect the electrical supply to the boiler.
2. Remove the bottom panel.
3. Remove the controls panel.
4. Close the isolating valves on the CH flow/return at the base
of the boiler then release CH system pressure by opening
one of the CH drain cocks on the isolating valves.
It is not advisable to release system pressure using the
safety valve.
SERVICING
SER
VICING
10. Supporting the valve, undo the 4
retaining screws and withdraw the
gas valve, leaving the plate with
the 3 studs in place.
11. Transfer the gas cock union and
elbow assembly to the new gas
valve, reusing the four M5 x 10
screws, together with the new 'O'
ring seal provided.
12. Fit the new gas valve in reverse
order, ensuring that the gas valve
gasket, manifold gasket and
injector pipe 'O' ring are all
undamaged
13. Operate the boiler for 10 minutes
at full DHW rate and check the
burner pressure / gas rate against
the value shown on the data plate
or in Table 3.
Summary of Contents for CC 100 FF
Page 1: ......
