Drain Pump Control - Daikin 4MXL-T Series Service Manual

SA Indoor Unit Functions
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.
∗1. If the float switch turns ON again during the residual operation of the drain pump, cooling
∗2. If the float switch remains OFF even after the residual operation of the drain pump has
∗3. The drain pump turns OFF once residual operation has ended, then turns ON again after
∗4. After A3 is determined and the unit comes to an abnormal stop, the thermostat will
94
OFF
Float switch
ON
ON
Thermostat
(running)
OFF
ON
Error display
OFF
ON
Drain pump
OFF
OFF
Float switch
ON
ON
Thermostat
(running)
OFF
ON
Error display
OFF
ON
Drain pump
OFF
operation also turns on again (thermostat ON).
ended, the error code A3 is determined.
5 seconds.
remain OFF even if the float switch turns ON again.
∗1
5 sec. 5 sec.
5 min. 5 sec.
(R24037)
∗2
∗4
∗3
A3
5 min. 5 sec. 5 min. 5 sec.
Part 4 Functions and Control
SiUS121827E
(R24610)