11 Maintenance notes
Refrigerant collection method
SMGB0136 rev.0 - 07/2021
336
11.6.2 Refrigerant collection method when replacing indoor unit
Process
No.
Procedure Remarks
1 Turn OFF the main switch of OU and I.U. -
2
Close all the gas stop valves (at low and high
pressure side) of OU and the liquid and gas stop valve
completely.
-
3
Collect the refrigerant by a refrigerant collector. Activate
forced open valve mode. Collect the refrigerant from the
gas stop valves (at low and high pressure sides) of OU
and the check joint of the liquid stop valve. Collect all
the refrigerant in the IU side by refrigerant collector.
• The discharge of the refrigerant in the atmosphere
is strictly forbidden. Make sure that the refrigerant is
collected by a refrigerant collector.
• Measure the quantity of the collected refrigerant and
record it.
4
After collecting the refrigerant, remove the charge hose
at the collector side, so that the inside of the refrigerant
cycle will be the atmosphere pressure. Cancel the
forced open valve mode.
• Make sure that there is no pressure increase after
collecting the refrigerant and then remove the charge
hose.
• Make sure that the refrigerant cycle is the atmosphere
pressure. Otherwise, problems such as the blowing of
gas and the suction of the cutting material may occur
when removing the refrigerant cycle parts.
5 Perform replacing I.U. -
6
Perform the vacuuming from the gas stop valves (at low
and high pressure sides) of OU and the check joint of
the liquid stop valve.
-
7
Recharge the collected refrigerant (Process No.3) from
the liquid stop valve.
-
8 Check the liquid and gas stop valves are fully opened. -
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