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Technical Data - Page 7
INJECTOR
SIZE
Min
4.9mm
Max
CIRCULATION PUMP SELECTION
The resistance through the heat exchanger when operating
with a water flow rate producing an 11
maximum boiler output are shown in TABLE 2. If other
controls, such as three-position valves are used in the
system, the resistance through them, quoted in their
manufacturer's literature must be taken into account. The
pump may be fitted on either the flow or return and MUST
be wired directly to the boiler terminal block, see FIG. 24. It
must be fitted with two isolating valves which are positioned
as close to the pump as possible. Closing of any valve must
always leave the open vent unobstructed.
FIG. 5 PRESSURE LOSS ACROSS BOILER
Supplied By www.heating spares.co Tel. 0161 620 6677
GAS RATE
INPUT
m3/h (ft3/h)
kW(Btu/h)
3.00(105.9)
32.1(109500)
3.31(117.0)
35.4(121000)
3.62(128.0)
38.8(132500)
0
C temperature riseat
OUTPUT
kW(Btu/h)
23.5(80000)
26.4(90000)
29.3(100000)
TABLE 2
WATER FLOW RATE
litres/sec
gal/min
0.637
8.4
NOTE: Great care should be taken when selecting a
pump to ensure that the correct flow rate is achieved.
Fully pumped systems should be designed so that the
system differential is no greater than 15ºC.
7
BURNER PRESSURE
mbar
in wg
10.0
4.0
12.0
4.8
14.0
5.6
BOILER RESISTANCE
WITH DISC
WITHOUT DISC
KN/m2
in wg
KN/m2
in wg
17.8
72
5.2
21
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