Drain Pump Control - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

Outline of Control (Indoor Unit)
6.7

Drain Pump Control

6.7.1 Normal Operation
The float switch is OFF 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.
6.7.2 If the Float Switch is ON with the Thermostat ON in Cooling Operation
When the float switch turns ON, 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 OFF again during the residual operation of the drain pump, cooling operation also
turns on again (thermostat ON).
∗2: If the float switch remains ON even after the residual operation of the drain pump has ended, the error code
A3 is displayed on the remote controller.
The drain pump turns OFF once residual operation has ended, then turns ON again after 5 seconds.
∗3: After A3 is displayed and the unit comes to an abnormal stop, the thermostat will remain OFF even if the float
switch turns OFF again.
61
ON
Float switch
OFF
ON
Thermostat
(running)
OFF
ON
Error display
OFF
ON
Drain pump
OFF
ON
Float switch
OFF
ON
Thermostat
(running)
OFF
ON
Error display
OFF
ON
Drain pump
OFF
5 min.
∗1
5 min. 5 sec. 5 min.
∗2 ∗3
A3
5 sec.
Functions and Control
SiUS331604E