Panasonic U-4..6ML5XPQ, Service Manual

Page: 89 / 283

Test Operation
Test Operation 77
1.1.4.2 Procedures for adding refrigerant
How to connect the tank?
When the refrigerant tank is connected and the specified operation is performed, the
appropriate amount of refrigerant will be charged into the system. After charging, the system will
stop automatically. The refrigerant must be charged according to the procedure described
below.
Caution
„
Make sure to turn ON the power 6 hours before starting the operation. This is necessary to
warm the crankcase by the electric heater.
„
Automatic charging is able to charge 6 kg/hour refrigerant at an outside temperature of 0°C
to 24 kg/hour refrigerant at an outside temperature of 35°C.
The charging time depends on the amount of charged refrigerant and on the outside
temperature.
„
Automatic refrigerant charging is NOT possible if the following restrictions are exceeded:
„
Outside temperature: 0°C DB~43°C DB
„
Indoor temperature: 0°C DB~32°C DB
„
Indoor unit connection capacity: 50%~130%
Automatic refrigerant charging procedure
1. Open the liquid and gas side stop valves completely.
Note that valve A must be closed!
2. Turn on the power of the outdoor unit and indoor units.
Note When an indoor unit is connected to the refrigerant system and the indoor unit is turned off,
automatic charging will fail.
3. Make sure that the led on the PCB on the outdoor unit are as shown in the table below. This
indicates that the system is operating normally.
Procedure 1: Adding refrigerant by using the automatic refrigerant charging function
(recommended)
To indoor unit To indoor unit
R-410A tank
Measuring instrument
Gas line stop valve
Liquid line stop valve
Gas line stop valve
Liquid line stop valve
Service port for
adding refrigerant
Valve A
R-410A tank
Measuring instrument
Pipe fixing plate
Service port for adding refrigerant
Valve A
V1 Y1
MODE
TEST/HWL
IND
MASTER
SLA
VE
L.N.O
.P
.
DEMAND
H1P H2P H3P H4P H5P H6P H7P
h h i h h h h
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