Daikin GYEQ20AN Service Manual page 66

Installation Work Manual
Additional refrigerant charging
CAUTION
Turn on the power supply for the indoor, outdoor, and BS units, and confirm signal transmission for
the indoor and outdoor units. (When
circuit board is held down, the number of connected indoor units is displayed on the right side of the
hour meter. If it matches the actual number of connected indoor units, the communication is
established.)
Make sure that the evacuation is completed. With all the closing valves "closed", connect a refrigerant
cylinder to the fluid side closing valve service port using a charging hose. When connecting the
refrigerant cylinder, take care to prevent air from entering the charging hose. When removing the
charging hose, be sure to use the control valve to prevent the refrigerant from being discharged.
With all electronic expansion valves closed, charge the refrigerant liquid from the liquid side closing
valve service port. Do not perform charging from the gas side.
When the refrigerant is charged from the gas side closing valve by mistake or the refrigerant is charged
prior to confirming signal transmission for the indoor and outdoor units, recover the refrigerant from the
both suction gas and discharge gas side closing valve and perform charging of the recovered volume from
the fluid side closing valve.
When the refrigerant cannot be recovered, be sure to contact your trial run operator.
When charging of the specified volume of additional refrigerant is completed, remove the charge
hose.
Note: If the specified volume of refrigerant cannot be charged, charge the remaining volume of
refrigerant by following "Additional Refrigerant Charging Mode". Before doing this, it is
necessary to wait for six hours after turning on the power for the outdoor unit.
Additional Refrigerant Charging Mode
* When the Additional Refrigerant Charging Mode is used, both the indoor and outdoor units should be operating.
Turn on the power for the indoor, outdoor, and BS
units and confirm signal transmission.
With the fluid side closing valve "closed," open the
both suction gas and discharge gas side closing
valve only.
Perform the following procedure using the switches
located below the hour meter on the outdoor unit
circuit board.
Note that some switches are disabled when approximately 10 minutes have passed after turning on
the unit or after the previous operation. If this is the case, you can re-enable the switches by
pressing and releasing SW2 (Rewire Checker). (In this case, do not hold down SW2 for 3 seconds or
longer. Doing so would result in wiring change.)
(1) Press NEXT and then press
(2) Press NEXT and then press
(3) Press NEXT and then press
(4) Press ENTER and the engine will start up, initiating the Additional Refrigerant Charging Mode.
Charge the refrigerant from the fluid side closing valve service port. Do not charge from the gas side.
After charging of the specified volume is completed, perform the following procedure to terminate
the Additional Refrigerant Charging Mode.
(1) Press ENTER and press DOWN to change the hour meter flickering display to [OFF]. Then press
ENTER . (The engine stops.)
The operation will stop automatically after a maximum of 30 minutes. If charging cannot be completed
within 30 minutes, charge refrigerant again using "Additional Refrigerant Charging Mode." In this case, a
power reset is required for both indoor and outdoor units.
After additional refrigerant charging is completed, remove the charge hose and then close the both
suction gas and discharge gas side closing valves. After this, ensure that the outdoor unit power is
turned off.
55
Be sure to follow the below-mentioned procedure for additional refrigerant charging.
Charging with the wrong procedure will cause damage to the compressor.
BACK
to set the blinking hour meter display to "2".
UP
to set the blinking hour meter display to "14".
UP
UP to set the blinking hour meter display to ON.
7 Installing the Outdoor Unit
located next to the hour meter on the outdoor unit
Hour meter and switch diagram on the outdoor unit circuit board
CH
RUN
SW2
STOP
Checker
Wiring
change
– 27 –
SiAUY361411EA
SW3
UP
SW7
SW6 SW4
BACK NEXT
ENTER
DATA
SW5
DOWN
[h]
022638-00E
0FGHP-EN0801 DGJ002
Device Overview