Potterton LPG 50e Installation And Servicing Manual page 7

TECHNICAL DATA - Page 7
BOILER INJECTOR
SIZE SIZE
50e 2.2mm
60e 2.4mm
80e 2.8mm
CIRCULATION PUMP SELECTION
The resistance - through the heat exchanger when
operating with a water flow rate producing an 11
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.
FIG. 5 PRESSURE LOSS ACROSS BOILER
GAS RATE at INPUT Kw
3
(Btu/h)
95.01- MJ/m
3
(2500 Btu/ft
3 3
M /H (ft /h)
0.72 (25.6) 18.75 (64.000)
0.87 (30.8) 22.56 (77.000)
1.17 (41.2) 30.25 (103,000)
0
C
OUTPUT
kW(Btu/h)
14.65(50000)
17.6(60000)
23.44(80000)
TABLE 2
Boiler
size Water Flow Rate
litres/sec gal/mm
50e .32 4.17
60e .38 5.0
80e .51 6.67
BURNER SUPPLY
PRESSURE PRESSURE
35.6(14.3) 37(14.8)
35.3(14.2) 37(14.8)
34.2(13.7) 37(14.8)
BOILER RESISTANCE
WITH DISC WITHOUT DISC
kN/m2 in wg kN/m2
4.0 16.0 1.25
5.7 23.0 1.75
10.5 42.0 3.0
in wg
5.0
7.0
12.0