Modes And Operating Conditions; Terms And Definitions; Protection Functions; Auto Mode - Koldfront WTC8001W Service Manual

6 Modes and Operating Conditions

6.1 Terms and Definitions

1. TA: Temperature of indoor ambient.
2. TE: Temperature of evaporator.
3. TS: The set temperature.
4. DAHT: Heater sensor.

6.2 Protection Functions


The compressor restart protection has a delay of 3 minutes.

5 minute operation for compressor in cooling mode.

Sensor protection against an open or short circuit.

6.3 Auto Mode


AUTO Mode is a setting that allows the unit to automatically switch between COOL and FAN in order
to achieve and maintain the desired set temperature.

In Auto mode the unit will choose cooling or fan-only mode based on ΔT(ΔT=TA-TS)
ΔT = TA - TS
ΔT ＞ 4F
-2F ≤ ΔT ≤ 4F

The unit will default to running mode when in auto mode under the following circumstances:
1. Powering on, changing mode to auto mode or adjusting temperature in auto mode will cause the unit
to default to running mode again.
2. A: In auto mode, if the compressor does not run for 15 minutes check condition B.
3. B: If ΔT<-8℉ or ΔT ＞2℉, the unit will default to running mode again according to ΔT until the
compressor stops.

6.4 Fan-Only Mode

 If the temperature can't be controlled by the selected mode and the room ambient temperature is
shown on the display the unit will default to fan only mode.
 The readout can only display a temperature of 32 to 99 ℉ (0 to 37℃.) lf the temperature is out of that
range the display will show LO or HI.
 The Timer function works in fan-only mode.
 The follow me function (on some models) does not work in fan-only mode.
Running mode
Cooling
Fan-only
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