21
Instructions for the installer
The following table gives an indication of the pump’s flow rate
in function of the
Δ
t of the primary circuit.
ALKON 50
ALKON 70
3.10 -
PRIMARY BOILER PUMP OR BOILER SYSTEM PUMP
NOTE: The use of a mixing header fitted between the boiler circuit and the system circuit is always advisable.
It becomes INDISPENSABLE if the system requires flow rates superior to the maximum permitted boiler flow
rates, which is to say lower than 27 °F (15 K).
Pressure losses in wc
Q:
water flow rate
gal/h
PRESSURE AVAIBLE TO THE SYSTEM (red)
PRESSURE LOSSES (Blue)
Power supply in btu (kW)
Max flow rate
demanded in gal/h (l/h)
ΔΔΔΔΔ
T 27°F (15°C)
Max flow rate
demanded in gal/h (l/h)
ΔΔΔΔΔ
T 36°F (20°C)
154,000
(45,13)
199,000
(58,32)
683
(2826)
513
(2120)
683
(3927)
663
(2946)
If determined by the installer
or
technical engineers
must
be sized according to the
data of boiler and system.
In case of fixed raet pump is
recommended to choose a
circulator with flow rate and
head at about 2/3 of the
characteristic curve.
The
ΔΔΔΔΔ
t between supply and
return boiler should never be
less than 27 °F (15 K).
PRESSURE LOSSES
ALKON 50
B
(1)
VALUES REFER TO THE MAX SPEED
(2)
IF EQUIPPED WITH OPTIONAL PUMP
PRESSURE AVAIBLE
ALKON 70 (1)
ALKON 50 (2) (1)
A
The chart below shows, respectively:
A) Prevalence available net losses of the boiler (For boilers
equipped with a pump supplied by LATTNER)
B) Pressure drop between Return and Delivery (For boilers
supplied without pump)
Size of the pumps
