6
TYPICAL SYSTEM DESIGN
NOTE:
– A drain cock should be installed at the lowest point of the heating circuit and beneath the appliance.
a) The available pump head is given in fig. 4.
The type of pump fitted is easily identified after removal
of the front panel.
b) A minimum flow rate corresponding to a heating diffe-
rential of 11°C must be obtained at all times.
c) A heating by-pass should be fitted to ensure condition
(b) is satisfied.
If thermostatic radiator valves are to be installed, at least
one radiator should be without a thermostatic valve
(usually the bathroom radiator).
d) A sealed system must only be filled by a competent per-
son using one of the approved methods shown in fig.
6. The system design should incorporate the connec-
tions appropriate to one of these methods.
e) The following paragraphs outline the specifications of
the items fitted to the boiler.
2.9.1 Pump
The available head shown in fig. 4 is that in excess of the
appliance hydraulic resistance, i.e. that available for the
system at any given heating load up to the maximum out-
put in C.H. mode. Never reduce the pump speed below
maximum as this will reduce D.H.W. output.
The pump speed is indicated on the side of the pump speed
selector switch (if fitted).
KEY
1 Boiler resistance
2 Available Head for C.H. for MYSON CP 51 pump
Fig. 4
Fig. 5
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