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Mid position valve?

Could someone please tell me if:

Honeywell 28mm V4073A
Siemens 28mm MVA328
Landis & Gyr MV-A328

Motorised valves are fully interchangable, is the internal wiring the same?
Firegem, March 2012
All are 5 wire same function but not compatible

ltd, March 2012
If the wiring colours in the leads are the same AND they have the same number of leads then you will be ok.

Gas58man, March 2012
link Click here to see other fixes for Honeywell.