23. When there is a demand for domestic hot water the boiler will not supply water at a
temperature greater than 65°C even if the cylinder thermostat is set higher.
Page 23
Scheme 4
Scheme 4
b -
blue
w -
white
o -
orange
gr -
grey
g/y - green/yellow
24.
Scheme 4
utilises an existing 3 port mid position zone valve and is based on a 'Y' plan
system but with significant changes. The zone valve operates as a two position type and the
boiler is controlled as in
Scheme 3
.
25. To convert a standard 'Y' plan to
Scheme 4
proceed as follows:-
i) Change the orientation of the zone valve so that port 'A' serves domestic hot water and port
'B' the central heating.
ii) Remove the wire between 7 on the terminal strip and terminal 2 of the cylinder thermostat.
iii) Disconnect the orange zone valve wire from 8 on the terminal strip and connect to 9.
iv) Disconnect the grey zone valve wire from 7 on the terminal strip and connect to 8.
v) Disconnect the white zone valve wire from 5 on the terminal strip and connect to 8.
vi) Connect 8 on the terminal strip to switched live on the domestic hot water relay PCB.
vii) Connect 5 on the terminal strip to terminal 2 of the boiler terminal block.
Summary of Contents for 35/80 IE
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Page 67: ...br brown bk black b blue r red g green g y green yellow w white Page 39 14 0 Fault Finding ...
Page 69: ...Page 40 Fault Finding Solutions Sections A to E ...
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