Relative pressure control
When the flow rate (demand for heating) is reduced, the system will reduce the
pressure produced by the pump (i.e. the head of the pump). This control mode is
suitable for systems where most of the pressure loss can be attributed to a common
trunk line (distribution line with branches) shared by two or more heating circuits.
3.7 Heating circuits 2 and 3
The circulation pump and control valve for heating circuit 2 and 3 require an auxiliary
controller. The controller is available as an optional accessory.
Accessory
Auxiliary controller with enclosure
Designation
32586192
Description
An enclosure containing an auxiliary controller for regulating heating circuit 2 and 3
or increasing the number of I/O slots for different functions. Installed on top of the
heat pump unit (ECO) or in the upper part of the heat pump frame (CUBE). 24 V
input from the heat pump, 230 V input from the building’s distribution board.
Documents
Electric diagram: 34793611 (110992), manual 34793612
The auxiliary controller is supplied with an electric diagram and the necessary
installation instructions. Install the auxiliary controller and its enclosure on top of the top
cover (ECO heat pumps) or in the upper section of the frame (CUBE heat pumps).
Heating circuits 2 and 3 operate in the same way as heating circuit 1, and the available
settings are identical. Once the auxiliary controller has been installed and circuits 2 and
3 have been connected, enable circuit control for these circuits from the
Initial setup
settings or
Service
settings, just like for circuit 1.
Note that when connecting actuators to the auxiliary controller, the actuator for the
heating circuit 2 control valve can be a 3-point or 0–10 V actuator. For heating circuit 3,
only a 0–10 V actuator can be used.
30 (54)
M8006 2123EN
