0906-E
34
FAULT CODES
EVAPORATOR FREEZING PROTECTION
Fault Code: 1n8
Description
This fault signal is activated on units chilling water without frost protection additives (Water without Glycol or
Brine) and with thermostatic expansion valves.
One compressor from the considered circuit n has been running for at least 2 minutes and the saturated
temperature TBPn is lower than the set point 3421 for more than 5 seconds (for units filled with R407c).
This safety feature is disabled for 2 minutes after start-up or stop of a compressor or a fan on the considered
circuit.
With:
TBPn % Evaporating Temperature of circuit n - dew point (°C)
3421 % Minimum Evaporating Temperature (°C)
Action
$ Immediate shutdown of circuit n
$ Fault signal sent to the control display.
$ The remote fault signal is delayed by 6 minutes
Reset :
The first 3 faults are automatically reset
After three faults the circuit n can only be restarted by a manual reset
Note:
Fault counter is cleared and reset every day at 10 am, as long as the maximum number of faults has not
been reached.
Possible causes Solving the problem
Faulty LP pressure sensor Replace the pressure sensor.
Faulty wiring or loose sensor connection. Check pressure sensor connections and wiring.
Insufficient water flow rate in the evaporator. Check flow rate and adjust flow switch if necessary.
Clogged evaporator Clean evaporator.
Check set points Replace pressure sensor.
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