Specification MCAC-TSM-2008-02
54 Installation
3. Low pressure protection (code: Er05)
Low pressure<0.15MPa, display Er05, compressor and outdoor fan stop; Low pressure>0.3MPa,
compressor and outdoor fan restart （3 minutes delay necessary）
If Er05 appears 3 times in 1hour, the chiller can only resume from protection manually.
Values display indication Er05
Refer to the instruction manual: Low pressure protection
Judge 1: check the low pressure switch is well.
Replace the low pressure switch
No
Judge 2: Whether the temperature of external and inlet water is low
Yes
Check the operation conditions:
1. the temperature of inlet water (cooling: below 20 , ℃
heating: below 45 )℃
2. cooling: the indoor temperature is ≥17 and the ℃
ambient temperature is 10℃～43℃
3. heating: the indoor temperature is ≤30 and the ℃
outdoor temperature is -15℃～24℃
Stop the operation, and run it
at the normal condition.
No
Yes
Judge 3: Whether the air is in water circuit.
Yes
Recharge the refrigerant
No
Jud
e 3: Whether the refri
erant char
e is abundant.
Check the temperature of compressor discharge and
suction and the pressure of compressor discharge and
suction are normal.
Recharge the refrigerant
No
Yes
Judge 5: PCB is malfunction.
Replace PCB
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