MPI Technologies FCX - Manual (Page 22)

  
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Replacement of the thermostats or the thermometer
requires removal of the bulb from its location and the
control from the control box.
• The bulb for the Boiler Temperature Thermo-
meter is located on the first circuit heating out-
put tube. Remove the bulb from the tube,
remove the thermometer mounting screws in
the control box and remove the thermometer.
Replace the thermometer with another, routing
the bulb capillary the same way as the original,
replacing the bulb on the tube properly and as
securely as possible.
• The bulbs for the Boiler Temperature Control
Thermostat and the Water Overheating Safety
Thermostat are both located in pockets on the
side of the boiler shell. To change either, remo-
ve the bulb from the pocket, remove the ther-
mostat mounting screws in the control box and
remove the thermostat. Replace the thermos-
tat with another, routing the bulb capillary the
same way as the original, replacing the bulb
properly into the pocket as far as possible.
• The bulb for the Combustion Product Overhea-
ting Thermostat is located in a well provided in
the condenser access plug/inspection port.
Remove the combustion test point plug and
washer from the inspection port to free the
thermostat bulb, and remove the bulb from the
well. Remove the thermostat mounting screws
in the control box and remove the thermostat.
Replace the thermostat with another, routing
the bulb capillary the same way as the original
and replacing the bulb properly into the well as
far as possible. Replace the combustion test
point plug and washer in the inspection port,
securing the bulb in place.
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