Carel Hecu CO2 - Page 51

51
ENG
Hecu CO
2
+0300085EN rel. 2.2 - 07.05.2019
Action Troubleshooting
Unit switched off Check control probes *
No control action
Corresponding functions disabled:
- T_dis control by Hb02
- speed control based onT_dis by Hb03
Check T_dis probe *
No control action
The HPV valve is set to a safety percentage on Fhb13
Check P_GC probe *
Corresponding functions disabled:
- control switches to T_out in case of P_GC fault on
Dg14
- gas cooler speed up on T_out on Dg13
Check T_out *
Corresponding functions disabled
- if probe A is faulty or not correctly confi gured, the
generic function associated with it will no longer
be active
Check generic an.input A *
Corresponding functions disabled
- if probe B is faulty or not correctly confi gured, the
generic function associated with it will no longer
be active
Check generic an.input B *
Corresponding functions disabled
- if probe C is faulty or not correctly confi gured, the
generic function associated with it will no longer
be active
Check generic an.input C *
Corresponding functions disabled
- if probe D is faulty or not correctly confi gured, the
generic function associated with it will no longer
be active
Check generic an.input D *
Corresponding functions disabled
- if probe E is faulty or not correctly confi gured, the
generic function associated with it will no longer
be active
Check generic an.input E *
A fi xed percentage of speed can be set in the event
of faulty or disconnected probe on Cag03
Check P_suc probe *
No control action Check T_suc probe *
Fan shutdown Check T_out_GC probe *
No control action
The RPRV valve is set to a safety percentage on
Fhb26
Check P_ric probe *
No control action
Vapour injection disabled
Check P_vap_inj probe *
No control action
Vapour injection disabled
Check T_vap_inj probe *
No action on the parallel compressor
Parallel compressor stops for control
Check P_suc_par probe *
No action on the parallel compressor Check T_suc_par probe *
Parallel compressor shutdown Check P_dis_LT probe *
No action on the parallel compressor Check T_dis_LT probe *
Compressor shutdown • Check operation, type and setting of evaporator expansion valves (e.g. valve stuck closed)
• Check mechanical pressure switch safety thresholds
Compressor shutdown • Check operation, type and setting of evaporator expansion valves (e.g. valve stuck open)
• Check mechanical pressure switch safety thresholds
• Check HPV valve setting and operation
Fans forced to 0% while the alarm is active • Check fans and corresponding alarm settings
• Check correct mechanical operation of the fans (wiring, confi guration,..)
• Check correct positioning and operation of P_GC probe (compare reading on display against pressure gauge read-
ing)
• Check correct compressor operation (possible presence of liquid, excessive refrigerant charge, compressor sizing, ...)
Fans forced to 100% while the alarm is active • Check fans and corresponding alarm settings
• Check correct mechanical operation of the fans (wiring, confi guration,..)
• Check correct positioning and operation of P_GC probe (compare reading on display against pressure gauge read-
ing)
• Check correct compressor operation (low refrigerant charge, compressor sizing,..)
• Check HPV valve setting and operation
/ • Check refrigerant charge in the circuit, recharge is necessary
• Check pressure in the receiver
/ • Check oil level in the circuit
• Check operation of solenoid valve between separator and oil receiver
• Possible oil trapped in the evaporators
/ • Check fan settings and confi guration
• Check fan sizing in relation to the application
• Check correct mechanical operation of the fans (wiring, confi guration,..)
• Check HPV valve setting and operation