32
Heating/cooling circuit 2 without mixer
The flow temperature is controlled via the mixing func-
tion of the 4/3-way valve and the speed of the integral
heating circuit pump for heating/cooling circuit 2 at the
integral flow temperature sensor in heating/cooling cir-
cuit 2. Control is dependent on the flow temperature in
heating/cooling circuit 1.
■
For room heating, the max. flow temperature of heat-
ing/cooling circuit 2 cannot be higher than the current
flow temperature of heating/cooling circuit 1.
For room cooling, the flow temperature of heating/
cooling circuit 2 cannot be lower than the current
flow temperature of heating/cooling circuit 1.
■
The min. and max. speeds of the heating circuit
pump for heating/cooling circuit 2 are set in parame-
ters 1103.0 and 1103.2.
Conditions for indoor units with 2 integral heating/
cooling circuits
■
If the set flow temperatures of the two heating/cool-
ing circuits differ by more than 5 K, the heating/cool-
ing circuit with the higher set flow temperatures in
heating mode and the lower set flow temperatures in
cooling mode must be connected as heating/cooling
circuit 1.
■
The heating/cooling circuit with the higher heating/
cooling demand is connected to heating/cooling cir-
cuit 1.
If both heating/cooling circuits are at the same tem-
perature level, heating/cooling circuit 1 must cover at
least 45 % of the heating/cooling capacity.
■
For room heating, the max. flow temperature of heat-
ing/cooling circuit 2 must not be higher than the cur-
rent flow temperature of heating/cooling circuit 1. For
room cooling, the flow temperature of heating/cooling
circuit 2 must not be lower than the current flow tem-
perature of heating/cooling circuit 1. Therefore, a
radiator heating circuit must be connected as heat-
ing/cooling circuit 1 and an underfloor heating circuit
as heating/cooling circuit 2.
■
Heating/cooling circuit 2 may only be heated for a
short time with a set flow temperature 5 K higher
than heating/cooling circuit 1. If heating/cooling cir-
cuit 2 is an underfloor heating circuit, the max. per-
missible flow temperature must be observed.
■
The flow temperature of heating/cooling circuit 2 can
be max. 20 K lower than the flow temperature of
heating/cooling circuit 1.
■
The start limit for the instantaneous heating water
heater must be between –2 °C and –7 °C.
■
Minimum heating output to be maintained for heat-
ing/cooling circuit 1 depending on the temperature
spread Δϑ in heating/cooling circuit 1:
Δϑ 5 10 15 20
Minimum heating output 1.8 3.5 5.3 7
■
Simultaneous room heating via one heating/cooling
circuit and room cooling via another heating/cooling
circuit is not possible.
Note
If the above conditions cannot be met, it is not possible
to operate a heat pump with 2 integral heating/cooling
circuits in this system. In this case, select a heat pump
with 1 integral heating/cooling circuit. Connect the two
heating/cooling circuits downstream of an external buf-
fer cylinder.
Observe the following during configuration:
■
Heating mode:
Make the set flow temperature for heating/cooling
circuit 1 higher than for heating/cooling circuit 2.
■
Cooling mode:
Make the set flow temperature for heating/cooling
circuit 1 lower than for heating/cooling circuit 2.
4/3-way valve position for heating/cooling demand
The position of the 4/3-way valve determines which
system components receive a flow of heating water.
The 4/3-way valve is actuated via a 0 to 10 V signal.
The current position of the 4/3-way valve in % can be
called up in the menu "Information" > "General".
Operating instructions for the heat pump
In heating/cooling mode, the 4/3-way valve moves to a
position of
—
= 0 % to < 50 %.
Function description
Heating/cooling (cont.)
6218234
Functions
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