Daikin RTSQ20PY1 Service Manual page 146

Test Operation
Note:
Note 1. When the refrigerant charging procedure is done or when pausing, close the valve of the
refrigerant tank immediately.
Note 2. Perform the settings on the circuit board (A1P) of the outdoor unit and check
the LED display after the power is on via the service lid which is in the lid of
the electric component box.
Operate switches with an insulated stick (such as a ball-point pen) to avoid
touching the life parts.
Make sure to re-attach the inspection cover into the switch box cover after the job is finished.
Note 3. If the power of some units is turned off, the charging procedure can not be finished properly.
Note 4. Make sure to turn ON the power 6 hours before starting the operation. This is necessary to
warm the crankcase by the electric heater.
Note 5. If operation is performed within 12 minutes after the indoor units, BS units and outdoor unit are
turned on, the H2P-LED will be lit and the compressor will not operate.
Note 6. After adding the refrigerant, do not forget to close the lid of the refrigerant charging port.
The tightening torque for the lid is 11.5 to 13.9 N•m.
Note 7. In order to ensure uniform refrigerant distribution, it may take the compressor ±10 minutes to
start up after the unit has started operation. This is not a malfunction.
1.3.1 Connection of Devices for Refrigerant Charge
Charge hose
Measuring
device
R-410A tank
(with siphon)
1.3.2 Additional Charging of Refrigerant
Pre-charging
To speed up the process of charging refrigerant for large systems, it is recommended to first
manually charge a portion of the refrigerant first before performing automatic charging.
1. Calculate how much refrigerant to be added using the formula explained in the chapter "How
2. The amount of pre-charging is 10 kg less than the calculated amount.
3. Open the valve B in the above figure (The valves A and C and the outdoor unit stop valves
4. After fully charged, close the valve B.
135
- The refrigerant charge port has a electronic expansion valve and will be closed at the end
of the refrigerant charging. However, the valve will be opened when operating the unit
after refrigerant charging.
- If the tank is left with the valve open, the amount of refrigerant which is properly charged
may get off point. More refrigerant may be charged by any remaining pressure after the
unit has stopped.
Equalizer pipe stop valve
Gas pipe stop valve
Liquid pipe stop valve
Refrigerant charge port
valve A
valve C
valve B
Line valve
to calculate the additional refrigerant to be charged" on P.131.
are to be kept closed.), and additionally charge refrigerant from the function unit liquid pipe
service port.
Outdoor Outdoor
Function unit
unit unit
A B
:
Gas pipe
service port
Liquid pipe
service port
To indoor unit
Field pipings Stop valve
Refrigerant flow Service port
Line valve
SiBE31-801_C
Test Operation