Circulation Pump Selection; Pressure Loss Across Boiler - Potterton Profile 30e Installation And Servicing Instructions

SITE REQUIREMENTS - Page 7
BOILER INJECTOR
SIZE SIZE
Min 2.9mm
30e
Max
Min 3.1mm
40e
Max
Min 3.5mm
50e
Max
Min 3.8mm
60e
Max
Min 4.4mm
80e
Max

CIRCULATION PUMP SELECTION

The resistance through the heat exchanger when operating
with a water flow rate producing an 11
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.
FIG. 5 PRESSURE LOSS ACROSS BOILER
Supplied By www.heating spares.co Tel. 0161 620 6677
GAS RATE INPUT
3 3
m /h (ft /h) kW(Btu/h)
0.73(25.8) 7.83(26702)
0.9(31.95) 9.69(33068)
1.05(36.92) 11.20(38217)
1.09(38.34) 11.63(39682)
1.24(43.8) 13.29(45336)
1.39(49.23) 14.93(50955)
1.39(50.23) 15.24(52000)
1.58(55.74) 16.90(57692)
1.75(61.84) 18.76(64000)
1.79(63.09) 19.14(65300)
1.94(68.55) 20.79(70950)
2.11(74.4) 22.57(77000)
2.18(77.1) 23.39(79800)
2.5 (88.4) 26.82(91503)
2.82(99.71) 30.25(103200)
0
C temperature rise
OUTPUT BURNER PRESSURE
kW(Btu/h) mbar
5.86(20000) 5.9
7.33(25000) 7.8
8.79(30000) 10.4
8.79(30000) 8.4
10.26(35000) 10.8
11.72(40000) 13.4
11.72(40000) 8.7
13.19(45000) 11.0
14.65(50000) 12.8
14.65(50000) 10.3
16.12(55000) 12.0
17.58(60000) 14.0
17.58(60000) 8.5
20.52(70000) 11.0
23.45(80000) 14.0
TABLE 2
in wg
2.4
3.1
4.2
3.4
4.3
5.4
3.5
4.4
5.1
4.1
4.8
5.6
3.4
4.4
5.6