Drain Pump Operation - Fujitsu AO G24LBCB Series Service Instruction

1-21. DRAIN PUMP OPERATION (For AU / AR type)
During Cooling / Dry mode
1. When the compressor starts, the drain pump starts simultaneously.
2. The drain pump operates continuously for 3 minutes after the compressor is turned off.
3. When the compressor stops by the "Anti- freezing protection", the drain pump is turned off
in 1 hour after the compressor stops.
4. When the water level in the drain pan rises up and then the float switch functions:
The compressor, indoor and outdoor fan motor operation are stopped.
1
Drain pump operates continuously for 3 minutes after the float switch is turned off.
2
(Almost condensing water may be drained)
3 The indoor unit fan motor operates after the float switch is turned off.
5. When the float switch turns ON continuously for 3 minutes, "FAILURE INDICATION" operates.
(It is necessary to turn off power for release it. )
6. When the float switch turns OFF less than 3 minutes, the unit starts Cooling operation.
( Fig. 15 : Detail of Drain Pump Operation in Cooling / Dry )
Compressor
Drain Pump
<Float Switch turns OFF less than 3 minutes>
Float Switch
Compressor
Indoor Fan
Drain Pump
During HEATING / FAN mode / Stop operation
1. When the water level in the drain pan rises up and then the float switch functions:
Drain pump operates continuously for 3 minutes after the float switch is turned off.
1
(Almost condensing water may be drained)
2. When the float switch turns ON continuously for 3 minutes, "FAILURE INDICATION" operates.
Thereafter, even if the float switch turns OFF, the "FAILURE INDICATION" is not released.
(It is necessary to turn off power for release it. )
( Fig. 16 : Detail of Drain Pump Operation in Heating )
Float Switch
Drain Pump
ON
OFF
ON
OFF
Less than 3 minutes
ON
OFF
ON
OFF
3 minutes ST
ON
OFF
ON
OFF
ON
OFF
ON
OFF
3 minutes
3 minutes
3 minutes
01-19