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14.8 Drain Pump Control
This unit has built-in with drain pump.
Control content
During COOL/DRY mode.
o During COOL/DRY mode, drain pump starts 10 seconds after indoor fan motor starts.
o The drain pump turns ON and turns OFF periodically. (ON or OFF duration depends on room temperature).
After COOL/DRY mode, when unit turns OFF (power standby) or changes to HEAT mode.
o The drain pump turns ON for 60 seconds immediately.
Error judgment
o When float switch detects ON signal continuously for 2 minutes 30 seconds, error code H21 are shown.
o When float switch ON has operated 2 times within 20 minutes, error code H35 are shown.
14.9 Pump down Operation by CN-S
A convenience method to activate pump down operation.
Control start condition:
o During power standby condition, short CN-S continuously between 1 second and 10 seconds.
Control stop condition:
o 480 seconds after pump down operation starts.
o CN-S is shorted again during pump down operation.
14.10 Demand Control
When the air-conditioner connected to Demand Response Enabling Devices (DRED), the power consumption
especially during peak hours could be controlled.
Relay 1
Relay 2
Relay 3
DRED
AIR-CONDITIONER
DRM1
DRM2
DRM3
COM
Three Demand response modes (DRM) are available
o DRM1 = Compressor cut off
o DRM2 = Operate at 50% of rated input power
o DRM3 = Operate at 75% of rated input power
During DRM, the Power Indicator blinks (3 seconds ON and 0.5 seconds OFF) to indicate the compressor cut off
status.
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