Westinghouse WHM24DMA21S Service Manual page 23

Step 4:
Open the maintenance panel.
Step 5:
Switch the dial code (referring to outdoor wiring diagram ) ON position on the main control board.
Step 6:
Switch on the machine power.
Step 7:
Check if "40" is displayed on the LED digital tube of the main control board.
Step 8:
When the numerals on the LED digital tube of outdoor unit count down to 0 (40 → 39 → 38 ... 0),
and "0" begins to blink, close the shut-off valve of the gas piping with an Allen wrench in a
clockwise direction.
Step 9:
Cut off machine power and the procedure for recovering refrigerant is finished.
NOTE:
Be sure to switch back the dial after refrigerant recovery operation. If not, it will enter
refrigerant recovery mode again after power ON. But if the power is not off, it will not
enter refrigerant recovery mode and will run normally.
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