High Pressure Abnormal; Cooling/ Cooling Main Operation; Heating/ Heating Main Operation - Fujitsu Airstage VR-II Series Service Manual

Trouble shooting 63
OUTDOOR UNIT Error Method:

High Pressure Abnormal

Detective Actuators:
Judgment from value sensed by discharge
pressure sensor
Forecast of Cause :
1. 3-way valve not opened
2. Outdoor unit fan operation defective, foreign matter at heat exchanger, excessive ambient
4. Solenoid valve defective
6. Discharge pressure sensor defective
<Cooling/ Cooling main operation>
Check Point 1 : Check if 3-way valve is open.
If the 3-way valve was closed, open the
3-way valve and check operation.
OK
Check Point 2 : Check the outdoor unit fan operation,
heat exchanger, ambient temperature
No foreign matter in air passage?
Heat exchange fins clogged
Outdoor unit fan motor check
Ambient temperature not raised by effect of other heat sources?
Discharged air not sucked in?
OK
Check Point 3 : Check the EEV, strainer
EEV (EEV1, EEV2) open?
Strainer clogging check (before and after EEV, ACM, oil return)
Refer to "Service Parts Information 15, 16".
OK
Check Point 4 : Check the 4-way valve (4WV1, 4WV2)
4-way valve operation check. Refer to "Service Parts Information 19".
OK
Check Point 5 : Check the solenoid valve (SV1, SV2, SV4)
Solenoid valve operation check. Refer to "Service Parts Information 18".
OK
Check Point 6 :Check the discharge pressure sensor
Discharge pressure sensor characteristics check
* For the characteristics of the discharge pressure sensor, refer to "Service Parts Information 23".
OK
Check Point 7 : Check the refrigerant amount
Refrigerant charged amount check
Caution
By changing of DIP SW 4-2 to ON, the Back-up operation can start when the active outdoor unit exists on the multi outdoor unit connection.
(Stand alone outdoor unit is impossible)
The following conditions will be concerned in use of back-up operation. (Please do not use the system with back-up operation for long time.)
- The operating compressor life time becomes shorter.
- The operating performance may drop due to the limited active compressor(s).
- The compressor may stop frequently by protection controlling.
*In order to keep the operating capacity, the release of the Low noise mode setting might be necessary.
Indicate or Display:
EA4. 1
Outdoor Unit : E. A 4. 1
Indoor Unit
Error Code
Detective details:
"Protection stop by "discharge pressure
any compressor"" generated 3 times within 60 minutes
temperature rise
: Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
: 9 U / A 4
3. EEV defective, strainer clogged
5. 4-way valve (including a coil) defective
7. Refrigerant overcharged
<Heating/ Heating main operation>
Check Point 1 : Check if 3-way valve is open.
If the 3-way valve was closed, open the
3-way valve and check operation.
OK
Check Point 4 : Check the EEV, strainer (indoor unit)
EEV operation check
Check of strainers before and after EEV
Refer to "Service Parts Information 14".
04-72
580psi(4.00MPa)during operation of
OK