Pump Overrun Facility; Overheat Safety Thermostats - Stanley Alpha 120 Servicing Instructions

Twin burner, oil fired central heating range cooker

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PUMP OVERRUN FACILITY

When the programmer switches OFF the boiler channel

then the water circulating pump will be switched off. If

during the period shortly after this the residual heat in the

appliance causes the water temperature in the boiler to

rise above 65°C then the pump overrun thermostat will

change over. This will switch on the circulating pump.

BOILER

This thermostat is a safety cut-out device which is

intended to operate if the other controls fail. This control

will "lock-out" and switches everything off except for the

programmer clock and the "Pump Overrun" facility.

This thermostat has to be manually reset once the

temperature has cooled down.

COOKER

This thermostat is a safety cut-out device which operates

if the control thermostat fails.

This

thermostat

temperature has cooled down.

Electrical Controls

automatically

resets

once

the

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