Carel k.Air, User Manual, Page: 51 / 192

51
Functions k.air +030220981 rel. 1.2 - 01.12.2020
30220980_187_R01
WARM UP
SWITCH ON
STEADY STATE
Fig. 9.b
Note:
during the warm-up phase, the devices can be activated at a certain percentage.
9.2.1 C heck fl ow switch
When the unit is switched on, a procedure checks for air fl ow after the fan has been activated. If there is no fl ow, an alarm is
activated that shuts the unit down. After the fan starts, a set signal waiting time will elapse, which diff ers according to the phase
of operation: start- up or steady state. This procedure is repeated for a set number of attempts, after which an alarm is generated
that shuts down the unit, with manual reset. If the fan is running (steady state), the fl ow switch, when activated, generates an
alarm that shuts down the unit after the fi rst attempt.
The fi gure shows an example of starting with three attempts set.
30220980_183_R01
t
t
t
Fan
Flow switch
Alarm
ON
retry nr. = 3
OFF
ON
OFF
ON
OFF
A A A
Key
Fan Fan
Flow switch Flow switch
Retry nr. Number of attempts
A Delay at start-up
Alarm Alarm
t Time
B Delay in steady state
Fig. 9.c
If the fl ow switch is activated during steady state operation, the behaviour is shown in the fi gure.
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t
t
t
Fan
Flow switch
Alarm
ON
OFF
ON
OFF
ON
OFF
B
Key
Fan Fan
Flow switch Flow switch
Retry nr. Number of attempts
A Delay at start-up
Alarm Alarm
t Time
B Delay in steady state
Fig. 9.d