E n-6
4-2. GAS CHARGE
Perform gas charge to unit.
1) Connect gas cylinder to the service port of stop valve.
2) Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3) Replenish specified amount of the refrigerant, hile operating the air conditioner for cooling.
Note:
In case of adding refrigerant, comply ith the quantity specified for the refrigerating cycle.
CAUTION:
W hen charging the refrigerant system w ith 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 slow ly, otherw ise the
compressor ill be locked.
To maintain the high pressure of the gas cylinder, w arm the gas cylinder w ith w arm w ater (under
104 F (40 C)) during cold season. But never use naked fire or steam.
Union
Stop valve
Liquid
pipe
I ndoor
unit
Stop valve ith
service port
Gas
pipe
Refrigerant gas
cylinder
operating valve
(for R410A)
Gauge manifold
valve (for R410A)
Charge hose
(for R410A)
Refrigerant gas cylinder for R410A w ith siphon
E lectronic scale for refrigerant charging
Refrigerant (liquid)
Outdoor
unit
Union
Union
Union
Model
I ndoor unit
MXZ-2C20NA2
A
–
B
4-3. REMOVING THE MAINTENANCE PANEL
The setting of Dip Sw itch on the outdoor controller board can be changed
ithout removing the front panel.
Follo the procedures belo to remove the maintenance panel and set
the Dip Sw itch.
1) Remove scre (s) hich fix the maintenance panel.
2) Remove the maintenance panel, and perform necessary settings.
3) I nstall the maintenance panel.
Note:
Make sure to fix the maintenance panel securely. Incomplete installation
could cause malfunction.
Maintenance panel
4-4. LOC ING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DR , HEAT)
4-5. LO ERING THE OPERATION NOISE OF THE OUTDOOR UNIT
• Description of the function:
With this function, once the operation mode is locked to either COOL/DRY mode
or HEAT mode, the air conditioner operates in that mode only.
* Changing the setting is required to activate this function. Please explain about
this function to your customers and ask them hether they ant to use it.
[How to lock the operation mode]
1) Be sure to turn off the main po er for the air conditioner before making the
setting.
2) Set the “3” of SW1 on the outdoor controller board to ON to enable this function.
3) To lock the operation mode in COOL/DRY mode, set the “4” of SW1 on the
outdoor controller board to OFF. To lock the operation in HEAT mode, set the
same sw itch to ON.
4) Turn on the main pow er for the air conditioner.
• Description of the function:
With this function, the operating noise of the outdoor unit can be lo ered by reducing the operation load, for example, during nighttime in COOL mode. Ho ever,
please note that the cooling and heating capacity may lo er if this function is activated.
* Changing the setting is required to activate this function. Please explain about this function to your customers and ask them hether they ant to use it.
Low er the operating noise
[How to low er the operating noise]
1) Be sure to turn off the main po er for the air conditioner before making the setting.
2) Set the “5” of SW1 on the outdoor controller board to ON to enable this function.
3) Turn on the main pow er for the air conditioner.
HEAT
COOL/DRY
L E D
SW1
SW8 7 1
SW2
SW1
ON
1 2 3 4 5 6
SW1
ON
1 2 3 4 5 6
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