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Page 15 XLT 020111
Operating Instructions for WhisperKOOL PDT JR. Thermostat
Indicators
There are three colored lights on the left side of the thermostat:
• PWR (Green) – When this light is on, the unit is powered.
• RUN (Yellow) – When this light is on, the compressor is running. If the light is flashing,
the unit is currently in the five-minute lockout.
• SET (Red) – This light flashes when the set-point temperature is changed by pressing
one of the three control buttons (see below). It flashes once for each press of the (⇑) or
(⇓) button, and twice when the 55 button is pressed.
When the unit is first turned on, all three lights flash slowly while the thermostat starts up.
Once the unit completes its start-up check, the compressor is locked out for five minutes.
During this time the RUN light will be flashing slowly (1 flash per second).
All three lights will flash rapidly if there is no probe connected to the thermostat.
Buttons
To change the set-point temperature, press either the (⇑), (⇓), OR (55) buttons. The SET
light will flash once for each 1°F the set-point is changed. This set-point will remain in
memory until you change it.
If you forget where the unit is set, pressing the (55) button will reset the set-point to
55°F and the SET light will flash twice. The temperature cannot be adjusted below 50°F
or above 76°F. Attempting to set the unit outside this range will cause the SET light to
rapidly flash.
Operation
Whenever the compressor shuts off normally, a five-minute lockout period begins and
the RUN light will be flashing slowly (1 flash per second).
If the compressor runs for 90 continuous minutes, a five-minute defrost cycle is forced,
during which time the compressor will not run. During this defrost cycle the RUN light
will be flashing rapidly (2.5 flashes per second).
PDT JR OPERATING INSTRUCTIONS