Technical data

SITE REQUIREMENTS - Page 7
BOILER INJECTOR GAS RATE INPUT OUTPUT BURNER PRESSURE
SIZE SIZE m
3
/h (ft
3
/h) kW(Btu/h) kW(Btu/h) mbar in wg
Min 2.9mm 0.73(25.8) 7.83(26702) 5.86(20000) 5.9 2.4
30e 0.9(31.95) 9.69(33068) 7.33(25000) 7.8 3.1
Max 1.05(36.92) 11.20(38217) 8.79(30000) 10.4 4.2
Min 3.1mm 1.09(38.34) 11.63(39682) 8.79(30000) 8.4 3.4
40e 1.24(43.8) 13.29(45336) 10.26(35000) 10.8 4.3
Max 1.39(49.23) 14.93(50955) 11.72(40000) 13.4 5.4
Min 3.5mm 1.39(50.23) 15.24(52000) 11.72(40000) 8.7 3.5
50e 1.58(55.74) 16.90(57692) 13.19(45000) 11.0 4.4
Max 1.75(61.84) 18.76(64000) 14.65(50000) 12.8 5.1
Min 3.8mm 1.79(63.09) 19.14(65300) 14.65(50000) 10.3 4.1
60e 1.94(68.55) 20.79(70950) 16.12(55000) 12.0 4.8
Max 2.11(74.4) 22.57(77000) 17.58(60000) 14.0 5.6
Min 4.4mm 2.18(77.1) 23.39(79800) 17.58(60000) 8.5 3.4
80e 2.5 (88.4) 26.82(91503) 20.52(70000) 11.0 4.4
Max 2.82(99.71) 30.25(103200) 23.45(80000) 14.0 5.6
CIRCULATION PUMP SELECTION
The resistance through the heat exchanger when operating
with a water flow rate producing an 11
0
C temperature rise
at 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.
TABLE 2
FIG. 5 PRESSURE LOSS ACROSS BOILER