12
If the pump are determined by the installer or
designer must be sized according to the data of
the boiler and system.
It is recommended to choose a pump with
the rate and delivery head at about 2/3 of
its characteristic heating curve.
The
D
t between supply and return boiler must
never be less than 15 ° K.
A) Head gain available net losses of boiler (for boilers with pump
supplied by Schuster)
B) Head losses between flow and return
(For boilers supplied without pump)
The table provides an indication the flow the pump in function of the
D
t of the primary circuit.
BWA R 50
BWA R 70
Power supply in kW
49,3
68,5
Max flow rate demanded l/h (
D
t 15 K)
2826
3927
Nominal flow rate request (
D
t 20 K)
2120
2946
residual pressure head
BWA R 70 (1)
BWA R 50 (2) (1)
PRESSURE
LOSSES
BWA R 50
Q: water flow rate (l/h)
Pressure losses (m/H
2
O)
2.4 - DIAGRAM OF FLOw RATE/PREssURE AvAILABLE FOR INsTALLATION
NOTE:
The use of a mixing header fitted between the
boiler circuit and the system circuit is always advi-
sable. It becomes INDISPENSABLE if the system
requires flow rates superior to the
maximum permitted boiler flow rates, which is to
say lower than 15K.
(1)
VALUES REFER TO THE MAX SPEED
(2)
ONLY IF EQUIPPED WITH OPTIONAL PUMP
Summary of Contents for BWA R50
Page 1: ...INSTALLATION AND SERVICING MANUAL R 50 R 70 BWA R 50 R 70 ...
Page 2: ...2 ...
Page 20: ...20 DOUBLE Ø 80 ...
Page 39: ......
