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Reactors
Service hose
Charging port
3-way valve
11.1. Preparation for pump down
Confi rm that the power is off, and then open the service panel.
11.2. Pump down procedure
(1) Check the 3-way valves (both at the liquid side and gas side) are opened.
(2) Turn the power on.
TEST
PUMP
POWER
RUN
DOWN
ERROR
MODE
(L1)
(L2)
(3) Press PUMP DOWN switch for 3 seconds or more after 3 minutes after power on.
TEST
PUMP
POWER
RUN
DOWN
ERROR
MODE
(L1)
(L2)
LED display lights on as shown in the above fi gure, and the fans and the
compressor start operating.
(4) LED display will change as shown below about 3 minutes after the compressor
starts. Fully close the 3-way valve on the liquid pipe side at this stage.
TEST
PUMP
POWER
RUN
DOWN
ERROR
MODE
(L1)
(L2)
•
If the valve on the liquid pipe side is not closed, the pump down cannot be
performed.
(5) When LED display changes as shown in the below fi gure, close the 3-way valve on
the gas pipe side tightly.
TEST
PUMP
POWER
RUN
DOWN
ERROR
MODE
(L1)
(L2)
If the valve on the gas pipe side is not closed, refrigerant may fl ow into the piping
after the compressor stops.
Step (4)
Closing direction
Hexagon wrench
Liquid pipe
En-13
Terminal blocks
Service port
Service port cap
Charging port cap
Service hose
LOW NOISE
PEAK CUT
(L3)
(L4)
(L5)
(L6)
(L7)
LOW NOISE
PEAK CUT
(L3)
(L4)
(L5)
(L6)
(L7)
LOW NOISE
PEAK CUT
(L3)
(L4)
(L5)
(L6)
(L7)
LOW NOISE
PEAK CUT
(L3)
(L4)
(L5)
(L6)
(L7)
Step (5)
Closing direction
Gas pipe
(6) LED display changes after 1 minute as shown in the fi gure below.
TEST
PUMP
POWER
RUN
DOWN
ERROR
MODE
(L1)
(L2)
Fans and compressor stop automatically.
If the pump down is successfully completed (the above LED display is shown), the
outdoor unit remains stopped until the power is turned off.
(7) Turn the power off.
TEST
PUMP
POWER
RUN
DOWN
ERROR
MODE
(L1)
(L2)
PUMP DOWN is completed.
Notes:
•
To stop pump down, press the
PUMP DOWN switch again.
•
To start the pump down again after the compressor is automatically stopped due to an
error, turn the power off and open the 3-way valves. Wait 3 minutes, turn the power on
and start the pump down again.
•
When starting the operation after completion of the pump down, turn the power off,
and then open the 3-way valves. Wait 3 minutes, turn the power on and perform a test
run in the "COOL" operation mode.
12. ERROR CODE DISPLAY
When an error occurs, "short-press" the ENTER switch once. The number of blinks of the
LED indicates the type of error.
12.1. How to check error code
12.1.1. Display when an error occurs
TEST
PUMP
POWER
RUN
DOWN
ERROR
MODE
(L1)
(L2)
Blinks
(Hi-speed)
Check that the ERROR LED blinks, and then short-press the ENTER switch once.
LOW NOISE
PEAK CUT
(L3)
(L4)
(L5)
(L6)
(L7)
LOW NOISE
PEAK CUT
(L3)
(L4)
(L5)
(L6)
(L7)
LOW NOISE
PEAK CUT
(L3)
(L4)
(L5)
(L6)
(L7)
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