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WPHW 25, WPHW 32
Low loss header
Installation instructions
Description of functions
A low loss header is designed to separate the volume flow between the
heat source and the consumer. The volume flow in the heat pump circuit
remains constant if, for example, the volume flow in the heating circuit
is reduced by thermostatic valves.
A low loss header is required in two-circuit systems without buffer cylin-
der to prevent pumps operating against each other, which would create
irritating noise; it also helps to achieve a sensible hydraulic system bal-
ance. The low loss headers are insulated, contain an air separator, a dirt
trap, an automatic float air vent valve and a drain valve. A sensor well is
provided for the heat pump return temperature sensor.
HC flow
Air vent valve
Heat pump
flow
Heat pump
return
Sensor well for
return temperature
sensor
Drain valve
0.10
0,10
0,09
0.9
0,08
0.8
0,07
0.7
0.6
0,06
0.5
0,05
0.4
0,04
0.3
0,03
0.2
0,02
0.1
0,01
0.00
0,00
0
200
400
600
2
HC return
125
225
Volume flow pressure drop diagram
WPHW 25 and WPHW 32
800
1000
1200
1400
1600
1800
Flow rate [l/h]
Specification
Type
Part no.
Pump rate
Internal diameter
HP flow and return
Heating circuit flow and return
Temperature in use
Operating pressure
Installation example
WPKI HK
2000
2200
2400
2600
2800
WPHW 25
WPHW 32
22 11 35
22 11 36
3
3
2 m
/h
3 m
/h
DN 25
DN 32
G 1 ½" fem.
G 2" fem.
G 1 ½" fem.
G 1 ½" fem.
max. 110 °C
0.6 MPa (6 bar)
WPKI HKM
HPKI HKV
WPHW 25 / WPHW 32
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