Viessmann VITOCAL 250-A - Page 40

40
Flow diagram
D
E
G
F
H
A
B
C
K
Fig. 11
Air source heat pump
Heating/cooling circuit 1
Indoor unit with 2 integral heating/cooling cir-
cuits:
Heating/cooling circuit 2
Instantaneous heating water heater
(not available with all heat pump types)
DHW cylinder
(integrated in floorstanding indoor units)
A
Return temperature sensor, secondary circuit
B
Condenser
C
Flow temperature sensor, secondary circuit
D
4/3-way valve
Positions:
DHW heating
Integral buffer cylinder
For indoor unit with 2 integral heating/cooling
circuits, also heating/cooling circuit 2
Heating/cooling circuit 1
Open flow direction
E
Flow temperature sensor, heating/cooling cir-
cuit 2
F
Indoor unit with 2 integral heating/cooling cir-
cuits:
Heating circuit pump, heating/cooling circuit 2
G
Integral buffer cylinder
H
Secondary pump
For indoor unit with 2 integral heating/cooling cir-
cuits, also heating circuit pump for heating/cool-
ing circuit 1
K
Flow sensor
Function description
DHW heating (cont.)
6218234
Functions