Carel pCO Manual page 21

on
COMPRESSOR1
Minimum running time
on
COMPRESSOR1
Minimum "off" time
on
COMPRESSOR1
Interval between two successive starts of same compressor
Time-zones
The time-zone control action proves to be an extremely useful option allowing pCO to work with a
lower set-point during certain periods of the day and above all during the night, so as to avoid
wasting energy. pCO has programmable time-zones. All you have to do is just set them (hour and
minutes) and their relative set-points. The table below shows the working logic of a time-zone
control action.
Eg:
HOUR/MINUTE
06:00
07:00
10:00
17:00
S
1,2
E
0,9
1
T
0,8
P
0,6
O
0,4
I
0,2
N
0
T
6.00
In order to set time-zones, it is necessary to provide pCO with a clock card. It is possible to program
up to 4 time-zones. Should you need less than 4, it is necessary to give the unused time-zones the
same values.
The table below shows RIGHT and WRONG settings when using only TWO time-zones.
Ver. 1.0 dated 21/10/94
off
on
off off
on
off off
SETPOINT EFFECT
0,9 bar
from 06:00 to 07:00 set-point = 0,9 bar
1 bar
from 07:00 to 10:00 set-point = 1 bar
1,1 bar
from 10:00 to 17:00 set-point = 1,1 bar
0,8 bar
from 17:00 to 6:00 set-point = 0,8 bar
1
7.00
on
COMPRESSOR1
COMPRESSOR2
Interval between starts of different compressors
on
COMPRESSOR1
COMPRESSOR2
Interval between stops of different compressor
1,1
10.00
TIME
off
on
off
off
on
off
19.12
6.00
7.00
10.00
17.00
17.00
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