Mitsubishi Electric MXZ-2C20NA2 Installation Manual page 7

-2. GAS CHARGE
Perform gas charge to unit.
1) Connect gas cylinder to the ser ice port of stop al e.
2) Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3) Replenish speci ed amount of the refrigerant, while operating the air conditioner for cooling.
Note:
In case of adding refrigerant, comply with the quantity speci ed for the refrigerating cycle.
CAUTION:
When charging the refrigerant system with additional refrigerant, be sure to use liquid refrigerant.
Adding gas refrigerant may change the composition of the refrigerant in the system and affect
normal operation of the air conditioner. Also, charge the liquid refrigerant slowly, otherwise the
compressor will be loc ed.
To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm water (under
104 F (40 C)) during cold season. But ne er use na ed re or steam.
-3. REMOVING THE MAINTENANCE PANEL
The setting of Dip Switch on the outdoor controller board can be changed
without remo ing the front panel.
Follow the procedures below to remo e the maintenance panel and set
the Dip Switch.
1) Remo e screw(s) which x the maintenance panel.
2) Remo e the maintenance panel, and perform necessary settings.
3) Install the maintenance panel.
Note:
Ma e sure to x the maintenance panel securely. Incomplete installation
could cause malfunction.
Model
MXZ-2C20NA2
Stop al e
Union
Union
Indoor
unit
Union
Stop al e with
Union ser ice port
Refrigerant gas
cylinder
operating al e
auge manifold
(for R410A)
al e (for R410A)
Refrigerant gas cylinder for R410A with siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
Maintenance panel
Indoor unit
A – B
Liquid
pipe
Outdoor
unit
as
pipe
Charge hose
(for R410A)
En-6