Argo 387006114, Technical Data & Service Manual, Page: 22 / 34

4-11 Pump Operation
Drain pump operates only in Cool and Dry Mode.
The float switch used for water level detection is closed under normal condition, and is open when wate
overflow.
For the NEC version of MCU, the "Overflow" and “Normal” conditions are indicated by a logic “0” and
“1” at the float switch pins connector respectively.
For the Fujitsu version of MCU, the "Overflow" and “Normal” condition are indicated by a logic “1” and
“0” at the float switch pins connector respectively. The overflow condition can activate the water pump in
Standy and operating modes
ON
OFF
ON
COMP
(WVL)
PUMP
OFF
ON
OPER
LED
OFF
Overflow
Water Level
Normal
BLINK
COMP/WVL is
forced OFF
8 min 8 min
Overflow when
unit is ON
Overflow when
unit is OFF
1 min
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