a. Pull off the two thermostat knobs. Remove two pan head screws securing control cover to L.H. side panel and
remove cover.
b. Remove two pan head screws securing rectangular cover to the rear top of the L.H. side panel and remove
cover to expose boiler and pump overrun thermostat phial housing pocket.
c. Remove split pin from the pocket.
d. Withdraw both boiler and pump overrun thermostat phials from the pocket, and separate the two phials from
one another.
e. Disconnect two electrical leads from the thermostat.
f. Unscrew thermostat spindle locknut to detach boiler thermostat from mounting plate.
g. Fit replacement thermostat and assemble in reverse order of removal. Electrical leads to be reconnected as
previously (
see fig 18
for connections). The boiler and pump overrun thermostat phials should be assembled
together before fitting into the pocket.
4.2.3 To Remove Pump Overrun Thermostat
a. Pull off the two thermostat knobs. Remove two pan head screws securing control cover to L.H. side panel and
remove cover.
b. Remove two pan head screws securing rectangular cover to the rear top of the L.H. side panel and remove
cover to expose boiler and pump overrun thermostat phial housing pocket.
c. Remove split pin from pocket.
d. Withdraw both boiler and pump overrun thermostat phials from the pocket, and separate the two phials from
one another.
e. Disconnect two electrical leads from the thermostat.
f. Unscrew thermostat spindle locknut to detach overheat thermostat from mounting plate.
g. Fit replacement thermostat and assemble in reverse order of removal. Electrical leads to be reconnected as
previously (
see fig. 18
for connections). The boiler and pump overrun thermostat phials should be assembled
together before fitting into the pocket.
4.3 Control Circuit Description -
see fig. 18
for wiring diagram.
(
see fig. 17
for terminal block and RELAY locations).
The main line voltage to the appliance is applied via terminal ‘L’ on terminal block. Basically the COOKER and
BOILER are connected in parallel with each other and in series with the PUMP OVERRUN thermostat through
RELAY (2).
Some switching is done via the RELAY (1) to segregate the COOKER and BOILER CONTROL and yet keep the
burner LOCK-OUT protection in operation.
4.3.1 Cooking
When mains power is switched on and the time switch connections are made (across L4/L5) power is supplied to
Relay (2) through the overheat thermostat. Contacts 1/3 on Relay (2) bring on the circulating pump and contacts
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