Riello NXHP Series Installation, Operation And Maintenance Instructions page 67

6 -ALARM DESCRIPTION
Description
47 Machine Overcurrent
Compressor Envelope Protection - Low TE
48
in Cooling
Compressor Envelope Protection - High
49
TE in Cooling
Exchanger Freeze Protection on Water
50
Temp (in Cooling)
Exchanger Freeze Protection on
51
Refrigerant Temp (in Cooling)
Compressor Envelope Protection - High
52
SST in Cooling
Compressor Envelope Protection - High
54
TD
Exchanger High Temp Protection - High
55
LWT/TR in Heating
Compressor Envelope Protection - Low
56
LWT/TR in Heating
Compressor Envelope Protection - High
57
SST in Heating
Compressor Envelope Protection - Low
58
SST in Heating
Compressor Envelope Protection - High
59
Inverter Current
Inverter Fault - Compressor current sensor
60
error
61 Inverter Fault - DC Link sensor error
62 Inverter Fault - PFCM current A error
63 Inverter Fault - PFCM current B error
64 Inverter Fault - Input voltage sensor error
65 Inverter Fault - Discharge FET error
Inverter Fault - Software Compressor
66
overcurrent
Inverter Fault - Hardware Compressor
67
overcurrent
68 Inverter Fault - Estimator fault
69 Inverter Fault - Compressor starting error
70 Inverter Fault - Fan Motor error (lower)
71 Inverter Fault - Fan Motor error (upper)
72 Inverter Fault - Wire miss
73 Inverter Fault - Communication error
74
Inverter Fault - DC under voltage
Reset type
Comment
Inverter absorbed current below
Stop X Par.517 Maximum Input Current
limit
Stop X
Stop X
Stop X Force pump to run.
Force pump to run until alarm
reset kind becomes manual.
Stop X X
Power cycle after more than 12
occurrences in 2 hours period.
Stop X
Stop X
Heating Mode and LWT above
75°C or TR above 70°C.
Stop X
Force pump to run while alarm is
active
Stop X
Stop X
Power cycle after more than 10
Stop X X
occurrences in 1 hour period
Stop X
Stop x
Stop x
Stop x
Stop x
Stop x
Stop x
Stop x
Stop x
Stop x
Stop x
Power cycle after more than 10
Stop x x
occurrences in 1 hour period
x Power cycle after more than 10
Stop x
occurrences in 1 hour period
Stop x
Stop x
Stop x
Investigation / corrective actions
1. Ensure that water flow rate is
sufficient and fan operation is normal
2. Check main power supply voltage
1. Check that ambient temperature
(OAT) is within the operating map
2. Check TE sensor
1. Check that ambient temperature
(OAT) is within the operating map
2. Check coil cleanliness
3. Check if fan operation is normal
4. Check TE sensor
1. Ensure that water flow rate is
sufficient
2. Check PMV operation
1. Ensure that fan operation is normal
2. Check if coil is not fouled and
minimum installation clearances are
respected
3. Check PMV operation
4. Inspect unit (oil / refrigerant leaks)
1. Check if water flow rate is not too big
(if external pump is used)
1. Ensure that fan operation is normal
2. Check if coil is not fouled and
minimum installation clearances are
respected
3. Check PMV operation
4. Inspect unit (oil / refrigerant leaks)
1. Ensure that water flow rate is
sufficient and fan operation is normal
2. Check main power supply voltage
1. Ensure that water flow rate is
sufficient and fan operation is normal
1. Ensure that water flow rate is
sufficient and fan operation is normal
1. Stop and disconnect the unit
2. Check fan motor connection
3. Check if impeller is not blocked
1. Stop and disconnect the unit
2. Check fan motor connection
3. Check if impeller is not blocked
1. Check compressor cable connection
1. Check NHC/inverter communication
cable
67