Service Manual

Pump Down Operation SiUS121502E
178 Trial Operation and Field Settings
1. Pump Down Operation
Pump Down
Operation
In order to protect the environment, be sure to conduct pump down operation when relocating or
disposing the unit.
1. Remove the valve caps from the liquid stop valve and the gas stop valve.
2. Carry out forced cooling operation.
3. After 5 ~ 10 minutes, close the liquid stop valve with a hexagonal wrench.
4. After 2 ~ 3 minutes, close the gas stop valve and stop the forced cooling operation.
Forced cooling
operation
Gas stop valve
Close
Liquid stop valve
Valve caps
Hexagonal wrench
(R14566)
Procedure 1. Turn the power off.
2. Remove the switch cover.
3. Turn off all the switches of SW5 and SW6 on the service monitor PCB.
4. Set the operation mode switch (SW2) to COOL.
5. Screw the switch cover again.
6. Turn the power on.
7. Wait until the 3-minute standby mode finishes.
8. Press the forced cooling operation ON/OFF switch (SW1).
Command frequency 18 class: 52 Hz
24/36 class: 30 Hz
Ending conditions 1. Press the forced cooling operation ON/OFF switch (SW1) again.
2. The operation ends automatically after 11 ~ 15 minutes (depending on the
model).
Service monitor PCB
HEAT
COOL
4
3
2
1
2
1
E
D
C
B
A
2
1
ON OFF
4
3
ON OFF
2
1
HEAT
COOL
Operation mode switch (SW2)
SW6
SW5
COOL
4
3
2
1
2
1
E
D
C
B
A
Screw
Remove
the switch
cover.
•Turn off all the switches of
SW5 and SW6.
Forced cooling operation
ON/OFF switch (SW1)
(R22273)