
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.
Содержание 35/80 IE
Страница 15: ...F 190mm G 143mm ...
Страница 20: ...Fig 5 ...
Страница 51: ......
Страница 55: ......
Страница 57: ......
Страница 59: ......
Страница 67: ...br brown bk black b blue r red g green g y green yellow w white Page 39 14 0 Fault Finding ...
Страница 69: ...Page 40 Fault Finding Solutions Sections A to E ...
Страница 70: ...Page 41 ...
Страница 71: ......
Страница 73: ......
Страница 74: ......