Cetetherm AquaEfficiency
Installation, service and operating instruction
66
18.12.2 AlfaPilot
This function require:
•
Valve #2:control valve
•
Pt1: temperature sensor
•
Pt2: surface temperature sensor
When Pt1>(S3+DT Recov Min) the function is activated and opens the second control valve wired on AO4
output, extra actuator.
The regulation is proportional at the opposite of AlfaStore A, and operates around a set point compared to the
measured temperature on Pt2.
This setpoint is either Internal OR External:
•
Internal : Calculated setpoint is the maximum of SP_Distrib and calculated setpoint of an heat curve
issued from S5
•
External : The setpoint is written in the parameter “SP_Distrib_Ext” via Modbus
All other AquaEfficiency functions are operational.
AlfaPilot mode is activated in the
Parameters DTrecov_Min (default 5°C), SP_Distrib and SP_Distrib_Ext are set in
Description
Connection on I/O terminal
No
Marked
24VAC, 22VA max
65
24VAC
0-10 VDC
66
AO4
0V
67
0V
Sensor
Description
Connection on I/O terminal
0V
Pt1-Pt2
Pt1
Temperature sensor, Pt1000 2 wires
34
35
Pt2
Temperature sensor, Pt1000 2 wires
61
62
