12.
Open the service valves fully (anti-clockwise direc-
tion). Disconnect the vacuum pump. Reinstall the
caps on the valves, tighten to a torque of 20 Nm.
Leak trace caps and connections using a sniffer or
leak spray. See page 23 for the valves' main func-
tions. Repeat steps 9-13 if you have more indoor
units. The indoor units must be marked with "indoor
unit A" and "indoor unit B".
13.
Complete insulation, protect against mechanical
impacts, secure and hang up.
Pump down
Pump down means retrieving all refrigerant in the out-
door unit without losing the system's filling. This is done
when the climate unit is to be moved or during repair
of the cooling circuit.
Procedure for "Pump down":
1.
Connect a manometer assembly to the low pressure
valve, open partially (1/4 turns). Extract air from the
manometer. Then close the high pressure valve fully.
2.
Start the climate unit in cooling mode. When the
pressure that is read off from the manometer has
dropped to a value less than 0.6 bar (absolute pres-
sure), the low pressure valve must be closed fully
and the climate unit switched off. Repeat for each
indoor unit.
3.
Remove the manometer assembly. The action "Pump
down" is now complete and all refrigerant has been
collected in the outdoor unit.
17Chapter 5 | InstallationAG-AC10
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