Daikin RYYQ8U7Y1B, Installer And User Manual

Page: 96 / 176

17 | Piping installation
Installer and user reference guide
96
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
NOTICE
If the power of some units is turned off, the charging procedure cannot be finished
properly.
NOTICE
In case of a multiple outdoor system, turn on the power of all outdoor units.
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" [
4
124]). If a
malfunction code is present, see "23.1 Solving problems based on error
codes" [
4
155].
NOTICE
Make sure all connected indoor units are recognised (see [1‑10], [1‑38] and [1‑39] in
"19.2.7 Mode 1: Monitoring settings" [
4
126]).
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.
There are two methods to charge additional refrigerant.
Method See
Automatic charge "17.4.6 Step 6a: To automatically charge
refrigerant"
[ 4 104]
Manual charge "17.4.7 Step 6b: To manually charge
refrigerant"
[
4
106]