Drain Pump Operation - Fujitsu ARU9RLF Service Instruction

20. DRAIN PUMP OPERATION

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)
The indoor unit fan motor operates after the float switch is turned off.
3
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. 12 : Detail of Drain Pump Operation in Cooling / Dry )
ON
Compressor
OFF
ON
Drain Pump
OFF
<Float Switch turns OFF less than 3 minutes>
ON
Float Switch
OFF
ON
Compressor
OFF
ON
Indoor Fan
OFF
ON
Drain Pump
OFF
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.
(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. 13 : Detail of Drain Pump Operation in Heating )
ON
Float Switch
OFF
ON
Drain Pump
OFF
3 minutes
Less than 3 minutes
3 minutes ST
3 minutes
3 minutes
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