To Pump Down; To Start And Stop Forced Cooling; 15 Technical Data - Daikin CHYHBH05AA Installer's Reference Manual

15 Technical data

14.2

To pump down

NOTICE
For the Hybrid for Multi, all required precautions must be
taken to avoid possible freezing damage at the water heat
exchanger before this function is allowed to be used or
activated. For detailed information see the indoor
installation manual.
Example: To protect the environment, pump down when relocating
the unit or when disposing of the unit.
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage. If you want to pump
down the system, and there is a leakage in the refrigerant
circuit:
▪ Do NOT use the unit's automatic pump down function,
with which you can collect all refrigerant from the
system into the outdoor unit. Possible consequence:
Self-combustion and explosion of the compressor
because of air going into the operating compressor.
▪ Use a separate recovery system so that the unit's
compressor does NOT have to operate.
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 lid from the liquid stop valve and the gas stop
valve.
2 Carry out the forced cooling operation. See
stop forced cooling" on page 84.
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 with the manifold if the vacuum is reached.
5 After 2-3 minutes, close the gas stop valve and stop forced
cooling operation.
b
c
a
d
e
d
15 Technical data
A subset of the latest technical data is available on the regional Daikin website (publicly accessible). The full set of latest technical data is
available on the Daikin extranet (authentication required).
Installer reference guide
84
14.3
1 Remove the service PCB switch cover.
2 Set DIP switch SW5 and SW6 to OFF.
3 Set DIP switch SW2 to COOL.
1×
1
4 Reattach the service PCB switch cover.
5 Turn ON the outdoor unit.
6 Press the forced cooling operation switch SW1 to begin forced
cooling.
7 Press the forced cooling operation switch SW1 to stop forced
cooling.
"14.3 To start and
1×
4
a Gas stop valve
b Closing direction
c Hexagonal wrench
d Valve lid
e Liquid stop valve

To start and stop forced cooling

SW1
NOTICE
Take care that while running forced cooling operation, the
water temperature remains
temperature read out of the indoor unit). You can achieve
this, for example, by activating all fans of the fan coil units.
CHYHBH05+08AA + EHYKOMB33A
Daikin hybrid for multi heat pump – heat pump module
ON OFF
2
SW5
1
SW6
A
4
3
1
2
2
1
1
2
4
2
3
3
2
1
4
COOL
HEAT
5
SW2
3
A
1
5 =
2
6
3
4
5
7
higher than 5°C (see
4P471761-1A – 2017.10