6
4-3. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)
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, while operating the air
conditioner for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified 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 composi
-
tion of the refrigerant in the system and affect normal operation of the air
conditioner. Also, charge the system slowly, otherwise the compressor
will be locked.
To maintain the high pressure of the gas cylinder, warm the gas cylinder
with warm water (under 40°C) during cold season. But never use naked
fire or steam.
Refrigerant gas
cylinder
operating valve
(for R410A)
Indoor
unit
Charge hose (for R410A)
Refrigerant gas cylinder
for R410A with siphon
Electronic scale for
refrigerant charging
Refrigerant (liquid)
4-4. LOWERING THE OPERATION NOISE OF THE OUTDOOR UNIT
• Description of the function:
With this function, you can lower the operating noise of the outdoor
unit when the operation load is small, for example, during nighttime in
COOL mode. However, please note that the cooling capacity can also
be lowered if this function is activated.
* Initial setting is required to activate this function. Please explain about
this function to your customers and ask them whether they want to use
it.
[How to lower the operating noise]
1) Be sure to turn off the main power for the air conditioner before mak-
ing the setting.
2) Set the 3rd Dip Switch of SW1 on the outdoor controller board to ON
to enable this function.
3) Turn on the main power for the air conditioner.
• Description of the function:
With this function, you can lock the operation mode of the outdoor
unit. Once the operation mode is locked to either COOL/DRY mode or
HEAT mode, the air conditioner operates in that mode only.
* Initial setting is required to activate this function. Please explain about
this function to your customers and ask them whether they want to use
it.
[How to lock the operation mode]
1) Be sure to turn off the main power for the air conditioner before mak-
ing the setting.
2) Set the 2nd Dip Switch 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 1st Dip
Switch of SW1 on the outdoor controller board to OFF. To lock the op-
eration in HEAT mode, set the same switch to ON.
4) Turn on the main power for the air conditioner.
Indoor
unit
Union
Union
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Stop valve
Service port
Outdoor
unit
Gauge manifold
valve (for R410A)
Lower the operating
noise
SW1
Operation mode
COOL
DRY
HEAT
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