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7.2 Refrigerant & Oil Charging
7.2.1
Oil charge
7.2.2
Procedure for additional oil refill
1. Close the evaporator electronic expansion valve by
raising the set point of the cooled space.
2. Wait for the CUBO to pump down and switch off the
compressors
3. Switch off the condensing unit (using ON/OFF
command on the display)
4. Close ball valve 3 in the CDU (90 on circuit diagram)
5. Fully open the evaporator electronic expansion valve
using the Carel magnet or using suitable manual
process for your EEV
6. Vent gas at valve 1 until pressure drops to 0 bar g
(check on display)
Internal check valve (138 on circuit diagram) will
prevent emptying the whole circuit
7. Connect a line from the oil can to valve 2 (liquid line
service port) and using a vacuum being drawn from
valve 1 (via the evaporator), pull the oil into the liquid
line.
8. When all the oil is in the system shut valve 2 (liquid line
service port) and continue to pull the system into deep
vacuum from valve 1 only.
9. When the vacuum is achieved charge vapour through
valve 1 up to 10 bar
10. Restore the automatic management of evaporator
electronic expansion valve and reset the set point if
adjusted.
11. Open ball valve 3 in the CDU (90 on circuit diagram)
12. Switch ON the unit (using ON/OFF command)
13. Recharge some additional refrigerant (same quantity
removed from liquid line)
Pag. 12-EN
All CUBO
AQUA are equipped by SCM with an additional pre-charged of
2
250ml of Oil (type PAG VG100) in the receiver. This info is highlighted with
a label applied in the switch panel door.
Take care to avoid moisture ingress. PAG oil is extremely hygrosopic!
Oil type approved is DAPHNE PZ100S or RENISO PAG100.
OEM Manual – CUBO
UMT/WG T MT Rev3.0 – 08/10/2021
AQUA
2
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