the blue wire from 4 (ch on) goes to "com" on new stat, the "on" connection from stat goes to brown on the hsa3.
Porgrammable Room Thermostat
- Thread starter ollie3686
- Start date
the blue wire from 4 (ch on) goes to "com" on new stat, the "on" connection from stat goes to brown on the hsa3.
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The original wiring of the programmer was correct, all you had to do was put the new stat in series with the 3 port actuator (hsa3) so from 4 in prog to "com" in stat then "on" in stat to brown on 3 port valve, so put the wiring back as it was and wire the stat as shown.
edit forget the colours, all the cables are "live" at one time or another
edit forget the colours, all the cables are "live" at one time or another
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