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WARNING:
When installing or moving the unit, do not mix anything other than specified refrigerant (R410A) into
the refrigerating cycle.
If air is mixed, it may cause the refrigerating cycle to get abnormally high temperature, causing a risk of
burst.
Tightening torque
N·m kgf·cm
Cap for service port 13.7 to 17.7 140 to 180
Cap for stop valve 19.6 to 29.4 200 to 300
5-5 EARTHING WORK
Put the earth circuit to the ground in accordance with “Technical Standards for Electrical Installation”.
CAUTION:
Do not connect the earth cable to any gas pipe, water pipe, lightening rod or telephone earth cable.
If there is some deficiency in earthing work, it may cause a risk of electric shock.
The product incorporates a frequency inverter and so requires earthing in order to observe electric charge and
noise caused by static electricity.
5-6 LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL,
DRY, HEAT)
• 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 oper-
ates in that mode only.
* Initial setting is required to activate this function. Please ex-
plain about this function to your customers and ask them
whether they want to use it.
[How to lock the operation mode]
1Be sure to turn off the main power for the air conditioner
before making the setting.
2Set the 2nd Dip Switch of SW1 on the outdoor controller
board to ON to enable this function.
3To 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 operation in HEAT mode, set the same switch to
ON.
4Turn on the main power for the air conditioner.
5-7 LOWERING THE OPERATING 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 and heating capacity can also be lowered if this
function is activated.
* Initial setting is required to activate this function. Please ex-
plain about this function to your customers and ask them
whether they want to use it.
[How to lower the operating noise]
1Be sure to turn off the main power for the air conditioner
before making the setting.
2Set the 3rd Dip Switch of SW1 on the outdoor controller board
to ON to enable this function.
3Turn on the main power for the air conditioner.
5-8 CHECKING AFTER INSTALLATION
After finishing the installation, check the following items again by marking .
Have special circuits been provided?
Is power supply voltage as specified?
Has indoor/outdoor connecting wire been inserted into terminal block?
Has indoor/outdoor connecting wire been secured firmly?
Has intermediary connection between power cable and indoor/outdoor connecting wire been carried out?
Is combination of connection pipes and indoor/outdoor connecting wire correct (Room A, Room B, Room C,
Room D)?
Is earth cable connection correct?
Has leak test been carried out?
Has air purge been carried out?
Is stop valve fully open?
Has drain discharge been checked?
Is insulation over connection pipe joints correct?
Is strength of installation location well enough?
Have all of WARNING and CAUTION items in “1. THE FOLLOWING SHOULD ALWAYS BE OB-
SERVED FOR SAFETY” been checked?
COOL/DRY HEAT
ON
ON
ON
ON
ON
Lower the operating
noise