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7
220692C
7
SECTION
A BYPASS MUST BE FITTED, see also Section 7.
The flow through the boiler must not be allowed to fall
below......
Space Saver K.F.B 60 - 12.6 litres/min (2.8 galls/min)
Space Saver K.F.B 70 - 14.76 litres/min (3.2 galls/min)
Where the water system can allow the boiler and pump
to operate on bypass only, the bypass must be at least
2.0metres away from the boiler.
If an inhibitor is to be used refer to the current issue of
BS5449 and BS7593, contact a manufacturer for their
recommendations as to the best product to use.
When using in an existing system take special care to
drain the entire system, including the radiators, then
thoroughly cleaning out before fitting the boiler whether
or not adding an inhibitor
2
Water Systems
Bypass
Inhibitor
Notes: Open Vented
and Sealed Water
Systems
Pump
See chart for pressure drop of the boiler.
The pump should be fitted in the flow
pipe from the boiler and have isolating
valves each side, integral if possible.
The variable duty pump should be set to
give a temperature difference of 11
o
C
(20
o
F) between flow and return with the
thermostat set at “MAX” which is about
82
o
C (180
o
F).
High resistance microbore systems may
require a higher duty pump.
PRESSURE DROP OF BOILER
Flow rate (litres / minute)
Water pressure drop (mm head of water)
Water pressure drop (inches head of water)
Flow rate (gallons / minute)
0
0 5 10 15 20 25 30 35
0
200
400
600
800
1000
1200
1400
0
10
20
30
40
50
1234567
UNIT
litre / min.
gal / min.
19.1
4.2
22.9
5.0
22.9
5.0
26.7
60 70
Min.
HEAT SETTING
At 11˚C (20˚F) differential
WATER FLOW RATE
Max.
60 70
5.9
4778
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