CIAT XtraConnect 2 - 18.5 Water return control for storage (CRISTOPIA); 18.6 Modulating control (water return only); Control of one compressor; Control of three compressors

EN - 47
Water temp.
50%
100%
STP: Setpoint P143 < P144
P143:Compressor 1 cut-in
P144: Intercom
p
ressor differential
Compressor 1 common, CPR 2 and CPR 3
Compressor 2 common
Compressor 3 common
COMPRESSOR 1
COMPRESSOR 2
COMPRESSOR 3
STP
+
P143
+
3xP14
4
-
P143
2
STP
+
P143
+
3xP144
13 15
16
14
STP
+
P143
STP
STP
+
P143
+
P144
-
P143
2
STP
+
P143
+
P144
9 11
12
10
Example: P143 = 1°C and
P144 = 2°C
STP
+
P143
+
P144
STP
+
P143
+
P143
2
STP
+
P143
+
P144
-
P143
2
STP
+
P143
+
2xP144
-
P143
2
STP
+
P143
+
2xP14
4 -
P143
STP
+
P143
+
2xP144
STP
+
P143
+
2xP14
4
+
P143
2
18.5 Water return control for storage (CRISTOPIA)
This type of control makes it possible to generate a maximum amount of capacity during a given period, often when electricity is cheapest. All
the circuits are turned on in turn at 10 second intervals and adjusted to setpoint 2 (P122) and the P155 differential. This type of control is only
possible in cooling mode. The setpoint 2 LED turns on.
- If P154 = No, the control mode remains standard and the return or supply can be controlled based on P141.
- If P154 = Yes, Storage control is enabled. The control mode is managed based on the setpoint selected:
- If setpoint 1 is selected, the control remains standard and the mode (supply return) is selected via P141.
- If setpoint 2 is selected, the control automatically switches to 'return with storage' mode.
18.6 Modulating control (water return only)
 Control of one compressor
 Control of three compressors
When just one compressor is insufficient, the second compressor is turned on and the first compressor drops to 50% capacity.
The capacities of both compressors then rise simultaneously until each is 100%.
If these two compressors are insufficient, the third compressor is turned on and the first two drop to half capacity.
The capacities of all three compressors then rise simultaneously until each is at 100%.
This control mode works the same way when ramping down.
STP
+
P143
STP
STP
+
P143
+
P144
-
P143
2
STP
+
P143
+
P144
9 11
12
11.510.510
STP
+
P143
+
P143
2
Example: P143 = 1°C and
P144 = 2°C
50%
100%
Water temp.
Load band
If water temp.
greater than
STP+P143+P143
2
Intake pulse
Load
band
Cont.
load
Load band
If water temp. drops
below
STP +P143,
exhaust pulse
If compressor off,
turned on at STP +
P143
Standby
dead
zone