40
Response 80 / 100 / 120
- 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 responce 100
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