42
Fault Handling
13. System condenser overheat protection
Fault phenomenon: The alarm indicator on the control panel flashes, the control panel displays
"
98
"
alarm;
Fault description: The protection is activated when the pipeline temperature of system condenser is higher than 68
℃.
Fault handling process:
14. Protection for too low anti-freezing temperature
Fault phenomenon: The alarm indicator on the control panel flashes, the control panel displays E3 alarm.
Fault description: When the discharge temperature
≤"
Cooling anti-freezing starting temperature (fan coil/plate type heat exchanger)
"
or the
return water temperature – discharge temperature
＞
10
℃
, the timing will be activated, and if the above conditions remains unchanged after
30s, the alarm will be triggered.
When the discharge temperature
≥"
Cooling anti-freezing stopping temperature (fan coil/plate type heat exchanger)
"
, the electric heating of
water loop will be stopped. When the fault occurs, the “Cooling plate type heat exchanger anti-freezing locking time” will be triggered, when
the time is over and the discharge temperature
≥"
Cooling anti-freezing stopping temperature (fan coil/plate type heat exchanger)
"
, the fault
can be reset by controller or centralized controller. After resetting the fault, the pump will continue to run a period of time before stopping.
Fault handling process:
15. Ambient temperature off-limit protection
See P6 for the ambient temperature range for the reasonable operation of the unit. If the range is exceeded before starting the unit, the unit
will not be able to be started and a fault code will be displayed. If the range is exceeded for 3 mins during operation, the unit will turn off auto
matically and displays fault code. Fault code: 87.
16. Air exhaust overheat protection (units with air exhaust temperature)
If any air exhaust temperature is
＞
135
℃
for 10s, the unit will identify it as air exhaust overheat and the unit will turn off and send an alarm.
Fault code: AC/AD/AE.
System condenser overheat protection
Check if the pipeline temperature of system
condenser is too high and is consistent
with the actual temperature.
Check if the connections
are correct; check if there
is resistance drift.
Check if the refrigerant volume is correct.
Check if the radiator is blocked or inefficient.
Check if the system is blocked, the system
fan is operating normally and the pump is
running normally during heating.
Discharge the excessive
refrigerant, or clean the radiator.
Check if the air condition water
loop is normal.
Check if the filter is blocked.
Check if the EEV is under normal control and
the valve or the connections are normal.
Replace the filter
Replace the damaged EEV.
Protection for too low anti-freezing temperature
Replace the discharge
temperature sensor
Check if the pump is under normal
operation.
Replace the pump
Check if the discharge temperature sensor
connected correctly and if there is resistance
drift.
Error
Error
Error
Error
Error
Error
OK
OK
OK
OK
