10
Below the table illustrating the possible situation.
Cooler
CU24V1 outputs
Y4
Q3
Q4
water
(PI control)
0-10V: valve or chiller
control
Pump or chiller start
Signalling of operating mode
- closed: cooling mode
- open: heating mode
agregat-1
(ON/OFF
contr.)
0-10V: valve or chiller
control
Chiller start
Signalling of operating mode
- closed: cooling mode
- open: heating mode
agregat-2
(PI control)
0-10V: valve or chiller
control
Chiller start
–
first stage
Chiller start
–
second stage
4.1.2
C
ONTROL TYPE
•
Cascade
: Cascade control with main sensor at B1 input and limit sensor at B2 input
•
Supply
: Supply air temperature control with supply sensor at B2 input.
4.1.3
R
ECOVERY TYPE
•
BY-PASS
: Plate heat exchanger with by-pass or rotary heat exchanger with 0-10V control at Y5
output of the CU24V1 controller
•
PLATE
: Plate heat exchanger without by-pass with inlet fan speed control
•
DAMPER
: Recirculation (mixing chamber) with 0-10V control at Y6 output of the controller
•
EXC+DAMPER
: Plate heat exchanger with by-pass or rotary heat exchanger + recirculation
(mixing chamber). 0-10V control outputs of the CU24V1 controller are respectively Y5 for the
exchanger and Y6 for the mixing chamber.
Type of exchanger protection
•
B3
: Temperature sensor at input B3
•
E5
: Presostat control at input E5.
4.1.4
T
YPE OF FAN
Select between inverter control or 1-2 gear AC fan control.
4.1.5
H
EAT PUMP CONTROL
For systems with a heat pump where the device performs winter heating and summer cooling, it is
possible to program the controller to control these systems. Set the heat pump mode by setting the
following parameters:
-
Heat pump: Yes
-
Heating: water
-
Cooling: water
After this setting, signal Y3 controls the heating or cooling power from 0 to 10V, while for some units
with other control logic, signal Y4 controls the heating power from 5 to 10V and the cooling power
from 5V to 0V. Output Q3 works as the start of the unit while Q4 determines the heating or cooling
mode.
