CIAT Connect 2 - Setpoint Selection Via On;Off Input; Variable Setpoint Via 4-20 Ma Input

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9.10 Setpoint selection via on/off input
If the number of setpoints = 2 with selection via on/off input (the on/off input corresponds to terminals 4-6 on terminal block J6 on the
motherboard).
In cooling mode:
- If the setpoint is not adjusted based on the outdoor temperature
or there is a fault on the outdoor temperature sensor, the control
setpoint = P121 if the on/off input is open or P122 if the on/off
input is closed.
- If the setpoint is adjusted based on the outdoor temperature and
there are no faults on the outdoor sensor:
The setpoint is calculated using P121 if the on/off input is open. If
the input is closed, the setpoint is calculated using P122.
In heating mode:
- If the setpoint is not adjusted based on the outdoor temperature
or there is a fault on the outdoor temperature sensor, the control
setpoint = P123 if the on/off input is open or P124 if the on/off
input is closed.
- If the setpoint is adjusted based on the outdoor temperature and
there are no faults on the outdoor sensor:
The setpoint is calculated using P123 if the on/off input is open. If
the input is closed, the setpoint is calculated using P124.
9.11 Variable setpoint via 4-20 mA input
In heating mode:
Diagram 1
- Displayed if P120 = 3 and in HEATING mode:
If setpoint adjustment based on outdoor temperature = No or
there is an outdoor sensor fault → Control setpoint = result of
diagram 1
If the setpoint is adjusted based on the outdoor temperature =
Yes and there are no faults on the outdoor sensor:
The derived setpoint is calculated using the outdoor temperature.
The result of diagram 1 is taken as the setpoint (P123 or P124).
If P120 is set to „3‟, P131 automatically switches to „No‟.
- To reverse the direction of the slope, simply set P125.2 to >
P126.2 with a minimum difference of 5 K.
In cooling mode:
Diagram 2
Displayed if P120 = 3 and in cooling mode:
If setpoint adjustment based on outdoor temperature = No or there
is an outdoor sensor fault → Control setpoint = result of diagram 2
If setpoint adjustment based on outdoor temperature = Yes and
there are no faults on the outdoor sensor → The derived setpoint
is calculated using the outdoor temperature . The result of
diagram 2 is taken as the setpoint (P121 or P122).
If P120 is set to „3‟, P127 automatically switches to „No
- To reverse the direction of the slope, simply set P125.1 to >
P126.1 with a minimum difference of 5 K
IMPORTANT NOTE ABOUT THIS FUNCTION: operating problems may occur if parameters P127 and P131 are set to „Yes‟ and the
controller delivering the 4-20 mA signal has its own function for shifting the setpoint based on the outdoor temperature.
If the minimum value of the signal becomes less than 4 mA, the value of the setpoint will not drop below the minimum setpoint.
P 1 2 5 . 2 S T P F O R 4 m A
H E A T I N G - X x . x °
P 1 2 6 . 2 S T P F O R 2 0 m A
H E A T I N G - x x . x °
P 1 2 5 . 1 S T P F O R 4 m A
C O O L I N G - x x . x °
P 1 2 6 . 1 S T P F O R 2 0 m A
C O O L I N G - x x . x °
4 -20 mA input
4 -20 mA input