To Start And Stop Forced Cooling; To Start And Stop Forced Cooling Using The Indoor Unit On/Off Switch; To Start And Stop Forced Cooling Using The Indoor Unit User Interface - Daikin RXM20R5V1B Installer's Reference Manual

NOTICE
During pump down operation, stop the compressor before
removing the refrigerant piping. If the compressor is still
running and the stop valve is open during pump down, air
will be sucked into the system. Compressor breakdown or
damage to the system can result due to abnormal pressure
in the refrigerant cycle.
Pump down operation will extract all refrigerant from the system into
the outdoor unit.
1 Remove the valve cap from the liquid stop valve and the gas
stop valve.
2 Carry out forced cooling. See
cooling" [ 4 23].
3 After 5 to 10 minutes (after only 1 or 2 minutes in case of very
low ambient temperatures (<−10°C)), close the liquid stop valve
with a hexagonal wrench.
4 Check on the manifold if the vacuum is reached.
5 After 2-3 minutes, close the gas stop valve and stop forced
cooling.
b
c
a
d
e
d
a Gas stop valve
b Closing direction
c Hexagonal wrench
d Valve cap
e Liquid stop valve
12.3

To start and stop forced cooling

There are 2 methods to perform forced cooling.
▪ Method 1. Using the indoor unit ON/OFF switch (if present on the
indoor unit).
▪ Method 2. Using the indoor unit user interface.
12.3.1 To start and stop forced cooling using the
indoor unit ON/OFF switch
1 Press the ON/OFF switch for at least 5 seconds.
Result: Operation will start.
INFORMATION
Forced cooling stops automatically after 15 minutes.
2 To stop operation sooner, press the ON/OFF switch.
12.3.2 To start and stop forced cooling using the
indoor unit user interface
1 Set the operation mode to cooling. Refer to "To perform a test
run" in the installation manual of the indoor unit.
Note: Forced cooling will stop automatically after around
30 minutes.
2 To stop operation sooner, press the ON/OFF switch.
INFORMATION
If forced cooling is used and the outside temperature is <
−10°C, the safety device may prevent operation. Warm the
outside temperature thermistor on the outdoor unit to ≥
−10°C. Result: Operation will start.
ARXM25+35R5V1B RXM20~35R5V1B
R32 Split Series
4P519439-8H – 2020.07
"12.3 To start and stop forced
12 Disposal
Installer reference guide
23