EAS ELECTRIC EMCH Serie Manual De Instalación Y Manual De Usuario página 177

18.5.7 P2
When the pressure is lower than 0.14MPa, the system will display P2 protection, the ODUs will be standby.
When the pressure is higher than 0.30MPa, P2 protection finished and normal operation resumes.
P2: Low pressure protection
Refers to the wiring diagram to check whether the
high pressure switch is correctly connected
The wire of high pressure is broken or short circuit
high pressure switch the system running normally
The ambient Temp. and water inlet Temp. is low
(ambient temperature lower than -5℃)
Insufficient refrigerant caused by insufficient
recharge or refrigerant leakage*
The low pressure side is blocked, caused by
crushed or bent pipe, closed EXV, dirty filter, etc.*
PCB is damaged
Note:
* The phenomenon of insufficient refrigerant
Top temperature and discharge temperature of all compressors are higher than normal value, discharge pressure and suction
pressure are both lower than normal value, current is lower than normal value, suction pipe may be frosting. The entire phenomenon
will disappear after recharging refrigerant.
* The phenomenon of low pressure side blockage
The discharge temperature is higher than normal value, low pressure is lower than normal value, current is lower than normal value
and suction pipe may be frosting.
82
Yes
No
No
No
No
No
Reconnect pressure switch
Yes
Replace high pressure switch
Yes
Stop the unit and wait for ambient
temperature goes up
Yes
Add refrigerant or inspect the
system for leaks
Yes
Inspect the system and fix
the error
Replace PCB
V.2