MGD Gas Furnace
Service Manual
An improperly operating, or poorly located room
thermostat can be the source of perceived
equipment
problems. A careful check of the thermostat and wiring must be made then to insure
that it is not the source of problems.
LOCATION
The thermostat should not be mounted where it may be affected by drafts, discharge air from
registers (hot or cold), or heat radiated from the sun or appliances.
The thermostat should be located about 5 Ft. above the floor in an area of average temperature,
with good air circulation. Normally, an area in close proximity to the return air grille is the best
choice.
Mercury bulb type thermostats MUST be level to control temperature accurately to the desired
set—point. Electronic digital type thermostats SHOULD be level for aesthetics.
THERMOSTAT LOCATION
HEAT ANTICIPATORS
Heat anticipators are small resistance heaters built into most electro—mechanical thermostats.
Their purpose is to prevent wide swings in room temperature during furnace operation.
In order to accomplish this, the heat output from the anticipator must
be the same regardless of
the thermostat used. Consequently, most thermostats have an adjustment to compensate for
varying current draw in the thermostat circuit.
The proper setting of heat anticipators then is important to insure proper temperature control and
customer satisfaction.
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