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18
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Piping installation
Installer and user reference guide
84
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
NOTICE
If the power of some units is turned off, the charging procedure cannot be finished
properly.
NOTICE
Be sure to turn ON the power 6 hours before operation in order to have power
running to the crankcase heater and to protect the compressor.
NOTICE
If operation is performed within 12 minutes after the indoor and outdoor units are
powered on, the compressor will not operate before the communication is
established in a correct way between outdoor unit(s) and indoor units.
NOTICE
Before starting charging procedures, check if the 7‑LEDs display is as normal (see
101]), and there is no malfunction code on the user interface
of the indoor unit. If a malfunction code is present, see
NOTICE
Make sure all connected indoor units are recognised (setting [1‑5]).
NOTICE
Close the front panel before any refrigerant charge operation is executed. Without
the front panel attached the unit cannot judge correctly whether it is operating
properly or not.
NOTICE
In case of maintenance and the system (outdoor unit+field indoor units) does
not contain any refrigerant any more (e.g., after refrigerant reclaim operation), the
unit has to be charged with its original amount of refrigerant (refer to the nameplate
on the unit) and the determined additional refrigerant amount.
18.4.3 To determine the additional refrigerant amount
INFORMATION
For final charge adjustment in a test laboratory, contact your dealer.
INFORMATION
Note down the amount of additional refrigerant that is calculated here, for later use
on the additional refrigerant charge label. See
"To fix the fluorinated greenhouse
87].
Formula:
R=[(X
1
×
Ø9.5
)×0.059+(X
2
×
Ø6.4
)×0.022]
R
Additional refrigerant to be charged [in kg and rounded off to 1 decimal place]
X
1...2
Total length [m] of liquid piping size at
Øa
Metric piping.
When using metric piping, replace the weight factors in the formula
by the ones from the following table: