9.4. Drain Pump Control
Basic operation
·
The drain pump starts 50 seconds after the indoor unit starts or the thermostat comes on (i.e., 10 seconds after the fan
motor starts).
The drain pump stops 30 seconds after the indoor unit stops or the thermostat turns off.
·
The drain pump repeats a cycle of on for 30 seconds then off for between 50 and 90 seconds as long as the unit is
operating. Operation while the unit is off is determined by the difference between the temperature setting and the room
temperature.
Float switch operation
·
When the float switch turns on for 10 seconds continuously, the thermostat of the indoor unit turns off and the drain pump
operates continuously.
·
When the float switch stays on for 150 seconds continuously, the drain pump and indoor unit stop and the timer lamp
flashes indicating an H21 error.
20
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