Changing Components - Page 36
Overheat Thermostat
NOTE: On boilers converted for use with gravity D.H.W., the
overheat thermostat will have been rendered inoperable and
will never need changing.
Loosen the screw on the capillary retaining washer, allowing
the washer to move freely. Free the capillaries from the clips
on the left hand side of the combustion box. Withdraw the
two thermostat phials from the thermostat pocket.
Remove the locknut and withdraw the overheat thermostat
from the bracket.
Disconnect the two wires from the overheat thermostat and
refit them to the new component.
Reassemble in reverse order. Care must be taken to align
the overheat thermostat capillary with the groove in the main
thermostat phial.
NOTE: The overheat thermostat capillary may be somewhat
longer than necessary. Excess length should be tidied up by
making a neat coil. Contact with the side of the combustion
box should be avoided.
Reassemble all components in the reverse order to
dismantling.
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