Daikin REYQ-AATJA, Service Manual

Page: 175 / 495

SiUS372201EA Outline of Control (Indoor Unit)
Part 4 Functions and Control 168
9.5 Drain Pump Control
9.5.1 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 for another 5 minutes.
 The aim of residual operation after thermostat OFF is to eliminate the dew that condenses on
the indoor heat exchanger during cooling operation.
9.5.2 If the Float Switch is OFF with the Thermostat ON in Cooling Operation
 When the float switch turns OFF, the thermostat turns OFF simultaneously.
 After the thermostat turns OFF, the drain pump continues to operate for another 5 minutes.
Float s w itch
Error display
Thermostat
(r u nning)
OFF
OFF
O N
O N
O N
OFF
Drain p u mp
O N
OFF
5 min.
OFF
OFF
ON
ON
ON
OFF
ON
OFF
5 min. 5 min. 5 sec. 5 sec.
Float switch
Error display
Thermostat
(running)
Drain pump
A3
1
2
4
3

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 displayed on the remote controller.

3. The drain pump turns OFF once residual operation has ended, then turns ON again after
5 seconds.

4. After A3 is displayed and the unit comes to an abnormal stop, the thermostat will remain
OFF even if the float switch turns ON again.