53
ENG
Hecu CO
2
+0300085EN rel. 2.2 - 07.05.2019
Action Troubleshooting
/ • Check correct compressor operation (presence of liquid, excessive refrigerant charge, compressor sizing,..)
• Evaporators with valves fully open at the same time (e.g. MOP set incorrectly on MPXPRO, valves stuck open,..)
Compressor shutdown, set on Cae27 • Check correct compressor operation (incorrect sizing, low refrigerant charge,..)
• Evaporators with valves closed and compressors running (valves stuck closed,..)
LT compressor and parallel compressor shutdown • Check the two level sensors (low, high)
• Check wiring and electrical panel connections
• Check DI confi guration
Compressor shutdown • Check BLDC compressor operation based on the type of alarm
• Type of alarm signalled settable on screen Cae02
Compressor shutdown • Check BLDC compressor operation based on the type of alarm
• Type of alarm signalled settable on screen Cae05
Parallel compressor shutdown • Check parallel compressor operation based on the type of alarm
• Type of alarm signalled settable on screen Cbe02
Parallel compressor shutdown • Check parallel compressor operation based on the type of alarm
• Type of alarm signalled settable on screen Cbe05
Compressor shutdown, settable
on Hc06
• Check circuit piping
• Check refrigerant charge level in the circuit
Compressor shutdown and fan on
settable on Hc05
• Check piping, valves and circuit components
• Check correct compressor operation
One or both fans shut down, depending on the
confi guration
• Check fan connections and correct fan operation
• Fan sizing not suitable for the system
• Excessive refrigerant charge in the circuit
Actions involving the clock no longer confi gured
Unit shutdown Change board
/ Check the set probe *
/ Check the set probe *
/ Check the set probe *
/ Check the set probe *
/ Check the set probe *
/ Check the set probe *
/ • Check operating hour threshold on screen Cac13
• Reset operating hours on screen Cac14
HPV brought to set safety position
when alarm from DI activated
• Check the device connected to the DI
RPRV brought to set safety position
when alarm from DI activated
• Check the device connected to the DI
Compressor shutdown, set on Cae30 • Check the correct reading of the probes set for SH (P_suct and T_suct)
• Check compressor status (frost on the outside)
• Check liquid return from evaporators (SH reading on MPXPRO and UC)
Compressor shutdown • Check correct compressor operation (presence of liquid, refrigerant charge, sizing,..)
• Check evaporator valve operation and status (valves blocked, incorrect confi guration, wiring,..)
• Check MPXPRO/UC setting (probe operation and positioning, correct parameter confi guration, compare probe
reading against pressure gauge reading)
/ • Check status of P_GC and T_out_GC probes (type, wiring, correct positioning,..)
• Check correct mechanical operation of the fans (wiring, confi guration, sizing in relation to the application,..)
• Check HPV valve setting, operation and installation (mechanical operation, sizing in relation to the application,
correct opening/closing)
• Check warning threshold setting
/ • Check status of P_ric probe (type, wiring, correct positioning,..)
• Check RPRV valve setting, operation and installation (mechanical operation, sizing in relation to the application,
correct opening/closing)
• Check warning threshold setting
/ • Check status of T_out_GC probe (type, wiring, correct positioning,..)
• Check mechanical operation of the fans (wiring, confi guration, sizing in relation to the application,..)
• Check warning threshold setting
Compressor shutdown, set on Cae42 • Check RPRV valve setting, operation and installation (mechanical operation, sizing in relation to the application,
correct opening/closing)
• Check synchronisation with external driver (wiring and connections, confi gurations,..)
• Sizing of the receiver in relation to the application
• Charge in the circuit
Low superheat warning signal
No control action
• Check the correct reading of the probes set for SH (P_suct and T_suct)
• Check compressor status (frost on the outside)
• Check liquid return from evaporators (SH reading on MPXPRO and UC)
Compressor shutdown • Check inverter power supply
• Check phase connection between compressor and inverter (wiring and connections)
• Check STO
• Check confi guration of inverter parameters (baud rate, parity, number of bits)
Compressor shutdown • Check inverter operation and status
• Check list of alarms in the inverter manual (explanation of the alarms that may occur on the inverter)
Compressor shutdown with manual reset
after n restart attempts
• Check compressor connections to the inverter (swapped phases, wiring and incorrect connections,..)
• Check correct compressor operation (liquid in the compressor, excessive charge in the circuit,..)
• Check evaporator valve status (valves stuck open)
• Check positioning, installation and correct operation of P_GC probe (positioning before the check valve at the com-
pressor discharge, checking the values are read correctly)
• Check positioning, installation and correct operation of P_suct probe
To Next Page
Loading...