Ferroli optima 2001 VMF7 Installation Instructions Manual page 32

3.0 HONEYWELL GAS VALVE (fig. 31)
a) Refer to Section 1, items a, c, d, f, g, h (left hand side panel) and j.
b) Disconnect the four electrical connections from the top of the valve.
c) Disconnect modulating balance tube by removing the fixing screw, and gently pull off from the front of the valve.
d) Disconnect the gas supply to the gas valve at the inlet union.
e) Remove the screw securing the base of the gas valve to the control box frame of the appliance.
f) Remove the four Allen screw which secure the inlet supply pipe to the gas valve.
(Take care not to lose the sealing washer).
g) Undo the union which is on the burner supply pipe and withdraw gas valve towards front.
h) Re-assemble in reverse order. Re-connect electrical connection in accordance with the wiring diagram (fig. 25).
i) Fully test the operation of the new gas valve and reset burner pressures as prescribed (see commissioning).
4.0 P.C.B.
a) Refer to section 1, items a, c, d, f and j.
b) Unscrew two fixing screws on the P.C.B. top cover plate, lift and disconnect all connectors from P.C.B. (fig. 39).
c) Unscrew upper fixing screws from P.C.B.
d) Gently pull P.C.B. off mounting studs and remove.
e) Re-assemble in reverse order (Refer to wiring diagram fig. 25).
f) Range rate the boiler C.H. and check the operation of the controls (See commissioning).
Cover plate
fixing screws
P.C.B. upper
fixing screws
C.H. selector switch
5.0 CENTRAL HEATING LIMIT THERMOSTAT, OR FROST THERMOSTAT, OR OVERHEAT CUT OFF THERMOSTAT
a) Refer to Section 1, items a, d, f and i.
b) Refer to fig. 2 to identify the location of respective thermostat.
c) Remove two spring clips (with a pair of pliers).
d) Disconnect electrical connections to the thermostat.
e) Re-assemble in reverse order (Polarity Immaterial). Heat sink compound, must be used.
32
Fault diagnostic/temperature
control panel
2001
Time clock
P.C.B. connectors
Fig. 39