16
Technical data
Rated power
70 kW
Min. flow
2 l /min
Max. flow for 65°C tank and 45°C outlet temperature
30 l/min
Max. permissible flow
40 l/min
Max. operating pressure primary side (tank water)
4 bar
Max. operating pressure secondary side (cold water)
8 bar
Max. permissible water hammer pressure
15 bar
Rated temperatures primary flow / return
65 / 20 °C
Rated temperatures secondary flow / return
45 / 10 °C
Max. operating temperature primary/secondary
90 °C
Pressure loss secondary side (Kv value)
2.60 m³/h
Connection thread primary and secondary
G ¾” external thread
Materials (corresponding to DVGW/W270):
Fittings
Brass CW617N
Heat exchanger
Stainless steel 1.4401, copper
soldered
Pipes
Copper 99.96%
Seal material
PTFE, EPDM, Klingersil C-4324
Pump primary circuit
WILO ST20/7-3C
Volume flow sensor
Grundfos VFS 2-40
Primary sensor
PT1000
Controller
FWR21-FRISTAR
Indication referring to COMMISSION REGULATION (EU) No 622/2012:
The benchmark for the most efficient circulators is EEI ≤ 0.20.
Transmission power with different flow and outlet temperatures:
Pump mode
Buffer
flow [°C]
Return
[°C]
Cold water
supply [°C]
Hot water
outlet [°C]
Power
[kW]
Flow [l/h]
100%
59.3
25.0
10.3
45.0
68.7
1700
100%
55.4
27.0
10.3
45.0
56.5
1400
100%
50.3
33.2
10.3
45.4
34.7
850
100%
50.2
25.2
10.3
40.3
50.6
1450
