Drain Pump Control - Daikin RXSQ24TAVJU Service Manual

Outline of Control (Indoor Unit)
6.8

Drain Pump Control

6.8.1 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.
6.8.2 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.
∗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.
73
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
5 min.
∗1
5 min. 5 sec. 5 min.
∗2
∗4
∗3
A3
5 sec.
Functions and Control
SiUS331708EA