Mitsubishi SRK50ZHX-S Technical Manual page 63

f) After charging liquid refrigerant into the air conditioner by closing the charging valve, stop operation by fully closing the
gauge manifold's valve Lo. 2 5
g) Quickly remove the charge hose from the service port. 6
When stopped halfway, refrigerant being cycled will be released.
h) After securing the caps on the service port and control valve, check the caps' periphery to see if there is any gas leakage. 6 7
Refrigerant cylinder
(with syphon)
Electronic balance for refrigerant charging
7.3.3 Removal (When using new refrigerant piping)
(1) Removing the unit
a) Recovery of refrigerant from the outdoor unit by pump down
• At the time of pump down, use a gauge manifold exclusive for R410A.
• Operating the unit in forced cooling mode, recover refrigerant from the outdoor unit.
(For details of reclaiming steps and precautions, see the instruction manual prepared by the equipment manufacturer)
* Caution:
In the case of an outdoor unit which is incapable of pump down, use a refrigerant recovery unit.
b) Removing the indoor/outdoor units
• Remove the piping and wiring between the indoor and outdoor units.
• Tighten the outdoor unit's control valves and service port with the specified torque.
• Tighten the capped flare nuts at the indoor/outdoor units connecting part with the specified torque.
• Remove the indoor/outdoor units.
* Caution:
When storing the indoor unit piping in its original position, be careful not to break the piping.
(2) Installing the unit
a) Proceed with the installation following the steps described in "7.3.2 New installation work".
7.3.4 Replacing the unit (Never use the existing refrigerant piping)
Use a brand-new refrigerant piping (1) when replacing the air conditioner using the conventional refrigerant (R22) with an air
conditioner using the alternative refrigerant (R410A) or (2) even when replacing the air conditioner using the alternative refrigerant
(R410A) with another air conditioner using R410A, as a problem may occur due to differences in pressure characteristics of refrig-
erant or differences in type of lubricating oil (air conditioners using R410A do not always use the same type of the lubricating oils).
7.3.5 Retrofitting
Do not operate the air conditioner which has used the conventional refrigerant (R22) by charging the alternative refrigerant (R410A).
Otherwise, the equipment may cease to function normally and go wrong, or even cause serious problems such as rupture of the
refrigeration cycle.
(Indoor unit)
1
Service port
4
Charging
valve
5
2
Fig.7 Configuration of additional refrigerant charging
(Liquid side)
Control valve
(2-way)
(Gas side)
Control valve
(3-way)
3
Service port 6
60
- -
(Outdoor unit)
7
Opened
7
Opened