17
|
Piping installation
Installer and user reference guide
83
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
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‑segment display indication of the
outdoor unit A1P PCB is as normal (see
"19.2.4 To access mode 1 or 2"
102]). If a
malfunction code is present, see
"23.1 Solving problems based on error
127].
NOTICE
Make sure all connected indoor units are recognised (see [1‑10] in
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) by pre-charging before the automatic charging function can be started.
17.4.2 About charging refrigerant
Once vacuum drying is finished, additional refrigerant charging can start.
To speed up the refrigerant charging process, it is in case of larger systems
recommended to first pre-charge a portion of refrigerant through the liquid line
before proceeding with the manual charging. This step is included in below
procedure (see
"17.4.5 To charge refrigerant"
86]). It can be skipped, but
charging will take longer then.
A flow chart is available which gives an overview of the possibilities and actions to
be taken (see
"17.4.4 To charge refrigerant: Flow chart"
17.4.3 To determine the additional refrigerant amount
INFORMATION
For final charge adjustment in the test laboratory, please contact your local dealer.
