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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
cylinder to prevent pumps operating against each other, which would
create irritating noise; it also helps to achieve a sensible hydraulic system
balance. 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
0.9
0,09
0.8
0,08
0.7
0,07
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]
Specifi cation
Type
Part no.
Pump rate
Internal diameter
HP fl ow and return
Heating circuit fl ow 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
2 m
/h
3 m
/h
3
3
DN 25
DN 32
G 1 ½" fem.
G 2" fem.
G 1 ½" fem.
G 1 ½" fem.
max. 110 °C
6 bar
WPKI HKM
HPKI HKV
HPHW 25 / WPHW 32
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