High Pressure Protection 1; High Pressure Switch 1 - Fujitsu Airstage VR-II Series Service Manual

Trouble shooting 64
OUTDOOR UNIT Error Method:

High Pressure Protection 1

Detective Actuators:

High pressure switch 1

Forecast of Cause :
1. 3-way valve not opened
2. Outdoor unit fan operation defective, foreign matter at heat exchanger, excessive ambient
5. Solenoid valve defective
7. High pressure switch 1 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 check valve
Check if check valve (oilseparetor (out) of compressor 1) is not clogged.
OK
Check Point 6 : Check the solenoid valve (SV1, SV2, SV4)
Solenoid valve operation check. Refer to "Service Parts Information 18".
OK
Check Point 7 : Check high pressure switch 1
High pressure switch 1 characteristics check.
* For the characteristics of the high pressure switch 1, refer to "Service Parts Information 24".
OK
Check Point 8 : Check the refrigerant amount
Refrigerant charged amount check
Indicate or Display:
EA4. 2
Outdoor Unit : E. A 4. 2
Indoor Unit
Error Code
Detective details:
"Protection stop by "high pressure switch 1 operated during compressor 1
operation"" generated 3 times within 60 minutes
temperature rise
: Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
: 9U / A 4
3. Check valve clogge
6. 4-way valve (including a coil) defective
<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".
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.
04-73
4. EEV defective, strainer clogged
8. Refrigerant overcharged
OK