Fujitsu ARC90LHTA User Manual

01-14
1-14. PUMP DOWN
Confirm that the power is off, and the than (1)
open the service panel.
Turn the power on.(2)
Check that stop valves of liquid side and gas (3)
side are fully and properly open.
Hold PUMP DOWN button (SW102) for over 3 seconds.(4)
7 Segment LED of board on outdoor unit will fl ash, and
compressor will start the operation.
LED105
LED104
LED display of outdoor unit board will light-up with the display of “rUn” after around 5 minutes of the start of (5)
compressor operation. At this time, firmly close the three-way valve of liquid side immediately.
If the valve on liquid side is not closed at this stage, •
pump down will not be possible.
LED105
LED104
LED display of outdoor unit board will change as (6)
shown in the right fig ure after around 2-7 minutes
of the start of compress or operation. At this time,
fir mly close the three-way valve of gas side immediately.
LED105
LED104
If the valve on gas side is not closed at this stage, refrigerant •
may runoff through pipes after the compressor is stopped.
After “End” displays, compressor and outdoor fan will automatically stop after around 1 minute.(7)
LED105
LED104
Turn the power off. PUMP DOWN is comoleted.(8)
Note
For performing pump down once again after pump down task has failed and compressor has automatically stopped; •
open the close three-way valve (both liquid and gas side), disconnect the power supply at once and restore it after
2-3 minutes, and then perform pump down operation.
For restarting the operation after the completion of pump down operation; open the close three-way valve (both •
liquid and gas side), disconnect the power supply at once and restore it after 2-3 minutes, and make sure to
perform test operation in “Cooling”.
If an error occurs during pump down operation; as shown in •
the right figure, “E.98.” (pump down error) will appear.
In such case, recover the refrigerant from service port.
POWER
LED105 LED104
ERROR
MODE
LED101
(GREEN)
LED102
(RED)
POWER/MODE
lamp: OFF
ERROR
lamp: ON
7 Segment
LED Lamp
POWER
LED105 LED104
SW101
ERROR
MODE
LED101
(GREEN)
MODE
/EXIT
PUMP
DOWN
SELECT
ENTER
SW107
SW108
SW109 SW102
LED102
(RED)
POWER/MODE
lamp
MODE/EXIT
button
(Do not operate
in this chapter.)
SELECT button
(Do not operate
in this chapter.)
ENTER button
(Do not operate in this chapter.)
PUMP DOWN button
DIP switch
(Do not operate.)
7 Segment
LED Lamp
ERROR lamp
Fan of indoor unit will start the operation automatically.•
Compressor and outdoor fan will start the operation automatically.•
It you want to stop pump down operation once it has started, hold •
PUMP DOWN button (SW102) again for over 3 seconds.
Step (5)
Closing direction
Step (6)
Closing direction
Hexagon wrench
Liquid pipe
Gas pipe
If pump down operation has ended normally (LED display figure •
on the left),
outdoor unit will remain stopped until the power
supply is disconnected.
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Fujitsu ARC90LHTA Specifications

General

Brand	Fujitsu
Model	ARC90LHTA
Category	Air Conditioner
Language	English