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Split system single phase type
Operating Mode Changeover
Line no.
HC1
HC2
900
1200
In case of an external changeover via input H2 (on the extension module only) the operating mode to which the
changeover will be performed must be previously defined.
Heating Circuit Frost Protection
The heating circuit frost protection is continuously
activated (protection mode
Heating circuit frost protection in heating mode
If the flow temperature is below 5°C, the controller
initiates the production of heat and starts the heating
pumps, regardless of the current heating mode.
4.3.5 Cooling Circuit 1 Functions
The cooling sequence is automatically started when
the room temperature is higher than the comfort
setpoint in cooling mode (line 902). The cooling
function must be activated (command line 901 =
Auto) and is triggered by the programming clock
(Command line 907).
The cooling sequence is interrupted as soon as
heating circuit 1 indicates a need for heat or in the
presence of a heat demand signal from a DHW circuit
or other heating circuit (only if cooling is active).
The
controller
measures
temperature
and
compares
temperature setpoint to compute the flow temperature
setpoint. If the temperature is not low enough the
heat pump is started to provide cooling (reversed
control of the mixing valve).
Operating Mode
Line no.
Programming line
901
Operating mode
(Off / Automatic)
The cooling key on the user interface enables
switching between operating modes.
•
Off:
The cooling function is deactivated.
60
Programming line
Optg mode changeover
(None / Frost protection mode / Reduced / Comfort / Automatic)
) and is not adjustable.
the
current
room
it
with
the
room
If the flow temperature rises again above 7°C, the
controller waits another 5 minutes, and then stops the
production of heat and the heating pumps.
Heating circuit frost protection in cooling mode
See Cooling mode
The following settings apply to the hydraulic circuit in
zone 1 (HC1).
If there is a second zone, this zone can be cooled
with the setting 963 which will connect the pump
directly to zone 2. This will require setting the "Mixing
valve sub-cooling" parameter (938) to a suitable
value in order for both zones to be adequately cooled
according to the available emitters.
WARNING:
Cooling mode is prohibited on all radiators, heating-
only floors, or any emitters not intended for this
purpose.
•
Automatic:
The cooling function is automatically activated by the
time program (command line 907), the holiday
program, the occupancy key, or according to the
need.
Maintenance Document 1589-3
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