Carel k.Air, Руководство пользователя, Страница: 67 / 192

67
Functions k.air +030220981 rel. 1.2 - 01.12.2020
High evaporation pressure prevention (zone 5)
D evice D escription
BLDC compressor 1. Decrease the rate of capacity increase.
-
EXV MOP
Low compression ratio prevention (zone 6)
D evice D escription
BLDC compressor 1. Decrease the rate of capacity increase.
2. Increase capacity
EXV MOP variabile
Low diff erential pressure prevention (zone 7)
D evice D escription
BLDC compressor 1. Decrease the rate of capacity increase.
2. Increase capacity
EXV Variable MOP
Low condensing pressure prevention (zone 8)
D evice D escription
BLDC compressor 1. Decrease the rate of capacity increase.
2. Increase capacity
EXV -
Low evaporation pressure prevention (zone 9)
D evice D escription
BLDC compressor 1. Decrease the rate of capacity increase.
2. Reduce capacity
EXV -
9.10.8 C ompressor alarm management
Compressor shutdown
If abnormal conditions occur and the prevention actions are not eff ective, the circuit will shut down so as to avoid damaging
the circuit or other components, the control algorithm stops the compressors and closes the thermostatic valve. This does not
prevent the normal unit control functions, as the other devices remain active. The compressors will be able to start again when
the minimum off time or the minimum time between two starts has elapsed.
Compressor delay at start-up/in operation
Compressor start-up is a critical phase and for this reason k.air has diff erentiated control for some alarms to exceed the
transient phase from compressor start- up and allow it to reach steady operation. The following alarms implement this feature:
• low pressure alarm from pressure switch
• low pressure delta alarm
• out of envelope alarm (Ub13)
The alarm condition is ignored when the compressor is off . Once the start- up phase is complete, the steady-operation phase
begins entered and the alarm is trigged when the delay is exceeded..
30220980_193_R01
t
t
OFF
ON
ALARM
t
R.t.d.
Strt.up.d
OFF
ON
OFF
ON
ALARM
CONDITION
CMP
R.t.d.
Key
R.t.d. Alarm delay in steady operation
Strt.up.d Alarm delay at start-up
t time
CMP compressor
ALARM CONDITION Alarm condition
ALARM Alarm
Fig. 9.x