Remote Thermostat Operation - Whirlpool ATE0743SPP Technical Manual

ROOM THERMOSTATS
Room thermostats are controlled by the use of
a remote thermostat that will cycle the air
conditioner to maintain the desired room tem-
perature.
The fan speed switch controls the high and low
fan speed operation. The switch is located on
the control panel, and is independent of the
thermostat.
Room thermostats range from the simple bi-
metallic type, to the more complex electronic
setback type. No matter how simple or com-
plex, they are simply a switch (or series of
switches) designed to turn equipment on or off
under the desired conditions.
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.
THERMOSTAT LOCATION
Thermostats should not be mounted where
they 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'
above the floor, in an area of average tempera-
ture, with good air circulation. 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.

Remote Thermostat Operation

HEAT ANTICIPATORS
Heat anticipators are small resistance heaters
that are built into most electromechanical ther-
mostats (wired in series with the control "W"
circuit). Their purpose is to prevent wide swings
in room temperature during system operation
in the "heating" mode. Since anticipators are
wired in series, the "W" section of the circuit will
open if one burns out, preventing the "heat"
operation.
The heat anticipator provides a small amount
of heat to the thermostat causing it to turn off
the heat source just prior to reaching the set-
point of the thermostat. This prevents exceed-
ing the set point.
To accomplish this, the heat output from the
anticipator must be the same regardless of the
current flowing through it. Consequently, some
thermostats have an adjustment to compen-
sate for varying current draw in the thermostat
circuits.
Electronic thermostats do not use a resis-
tance-type anticipator. These thermostats use
a microprocessor that determines a cycle rate
based on a program loaded into it at the factory.
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