![background image](http://html1.mh-extra.com/html/daikin/ewaq006bavp/ewaq006bavp_installers-reference-manual_3372780075.webp)
13 Disposal
Installer reference guide
75
EWAQ+0 EK(2)CB
EKMB9W1
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492901-1 – 2017.06
13.1
Overview: Disposal
Typical workflow
Disposing of the system typically consists of the following stages:
1
Pumping down the system.
2
Bringing the system to a specialized treatment facility.
INFORMATION
For more details, see the service manual.
13.2
About pump down
The unit is equipped with an automatic pump down function, with
which you can collect all refrigerant from the system into the outdoor
unit.
Example:
To protect the environment, pump down when disposing
of the unit.
It is NOT required to pump down when relocating the unit.
NOTICE
The outdoor unit is equipped with a low pressure switch or
a low pressure sensor to protect the compressor by turning
it OFF. NEVER short-circuit the low pressure switch during
pump down operation.
13.3
To pump down
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.
1
Turn ON the main power supply switch.
2
Make sure the liquid stop valve and the gas stop valve are
open.
3
Press the pump down button (BS4) for at least 8 seconds. BS4
is located on the PCB in the outdoor unit (see wiring diagram).
Result:
The compressor and outdoor unit fan start
automatically.
4
After 5~10 minutes (after only 1~2 minutes in case of very low
ambient temperatures (≤–10 °C)), close the
liquid stop valve
with a hexagonal wrench.
5
Check with the manifold if the vacuum is reached.
6
After 2~3 minutes, close the
gas stop valve
and press the
pump down button (BS4) again.
Result:
The pump down operation is finished.
7
Turn OFF the main power supply switch.
a
c
b
d
d
e
a
Gas stop valve
b
Closing direction
c
Hexagonal wrench
d
Valve lid
e
Liquid stop valve