SiUS28-902_a Other Control
Function 38
Heating
When heating, hot air rises to the top of the room which results in a lower temperature close to the
floor where occupants are. This can cause the thermostat to turn off the unit before the lower part of
the room reaches set-point temperature. To ensure a more evenly distributed temperature, position a
Remote Sensor, at body level, in the occupied space or use the high ceiling installation service code.
Ex: When heating
Assuming the preset temperature in the figure above is 75°F, and the return-air temperature has
changed from 64°F to 82°F (A → D):
(This example also assumes there are several other air conditioners, the VRV system is off, and
that temperature changes even when the temperature sensor is off.)
Unit-mounted thermostat sensor is used for temperatures from 64°F to 77°F (A → C).
Remote controller temperature sensor is used for temperatures from 77°F to 82°F (C → D).
And, assuming return-air temperature has changed from 82°F to 64°F (D → A):
Remote controller temperature sensor is used for temperatures from 82°F to 73°F (D → B).
Unit-mounted temperature sensor is used for temperatures from 73°F to 64°F (B → A).
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