Daikin VRV III REMQ120PBTJ, Engineering Data

Page: 106 / 130

Installation EDUS391004-N
106 Installation of Outdoor Units
11. ADDITIONAL REFRIGERANT CHARGE
AND CHECK OPERATION
The outdoor unit is charged with refrigerant when shipped from the
factory, but depending on the size and length of the piping when
installed, it may require additional charging.
For charging the additional refrigerant, follow the procedure in this
chapter.
And then carry out the check operation.
11-1 Before working
[About the refrigerant tank]
Check whether the tank has a siphon pipe before charging and place
the tank so that the refrigerant is charged in liquid form.
(See the figure below.)
NOTE
• Always use the proper refrigerant (R410A). If charged with the
refrigerant containing an improper material, it may cause an explosion
or accident.
• R410A is a mixed refrigerant, so charging it as a gas will cause the
refrigerant composition to change, which may prevent normal
operation.
[Shutoff valve operation procedure]
When operating the shutoff valve, follow the procedure instructed
below.
NOTE
• Do not open the shutoff valve until “10. CHECKING OF DEVICE
AND INSTALLATION CONDITIONS” are completed. If the shutoff
valve is left open without turning on the power, it may cause
refrigerant to buildup in the compressor, leading insulation
degradation.
• Be sure to use the correct tools.
The shutoff valve is not a back-seat type. If forced it to open, it
might break the valve body.
• When using a service port, use the charge hose.
• After tightening the cap, make sure no refrigerant gas is leaking.
With siphon pipe
Other tanks
Stand the tank upright and charge.
(The siphon pipe goes all the way inside,
so the tank does not need be put
upside-down charge in liquid form.)
Stand the tank upside-down and charge.
3P215731-11R