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SA Indoor Unit Functions SiUS121827E
94 Part 4 Functions and Control
3.7 Drain Pump Control
Normal Operation
The float switch is ON in normal operation.
When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously.
After the thermostat turns OFF, the drain pump continues to operate.
If Float Switch is OFF with Thermostat ON in Cooling Operation
When the float switch stays OFF for 5 sec., the thermostat turns OFF.
After the thermostat turns OFF, the drain pump continues to operate for another 5 minutes.
Float switch
Error display
Thermostat
(running)
OFF
OFF
ON
ON
ON
OFF
Drain pump
ON
OFF
(R24037)
∗1. If the float switch turns ON again during the residual operation of the drain pump, cooling
operation also turns on again (thermostat ON).
∗2. If the float switch remains OFF even after the residual operation of the drain pump has
ended, the error code A3 is determined.
∗3. The drain pump turns OFF once residual operation has ended, then turns ON again after
5 seconds.
∗4. After A3 is determined and the unit comes to an abnormal stop, the thermostat will
remain OFF even if the float switch turns ON again.
OFF
OFF
ON
ON
ON
OFF
ON
OFF
5 min.5 min.
5 sec. 5 sec.
5 min.
5 sec.
(R24610)
Float switch
Error display
Thermostat
(running)
Drain pump
A3
∗1
∗2
∗4
∗3
5 sec.
5 sec.
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