Bit of a dilemma / argument with the way the Project manager, who has supplied me with a wiring diagram that hes done for control of hot water in a block of 4 cottages.
The cottages are pme earthing, there are 2 phases split between the 4 cottages.
There needs to be a call for heat from 2 cottages which are on a different phase to the boiler, his wiring brings the supply in to a wiring centre to supply the zone valves / and tank stats.
There are 2 immersion tanks, one downstairs and one up, both zone valves are in the same location with a cable for the downstairs stat tank having to run through the house to the upstairs one.
He is adamant that i wire it the way he wants, he's installed 2 5 core cables to the wiring centre from the cottage to the wiring centre which there is totally no need to do as it only requires the call for heat to the boiler.
Wiring it his way will mean that both the tank stats, zone valves etc will all have a supply + phase on them from another location.
The prospect of not being able to isolate this wiring centre valves/stats both up and downstairs, i cant see as being right when either a no volt 2 channel programmer would do a far better job with a lot less wiring and would mean that everything apart from a single connection would be from the same supply.
There is a bit more thrown into the mix as one of the cottages has to use a wireless switch to be able to turn off the bio mass hot water but hes provided one with a SL output which is totally useless as that SL would have to be wired from the other supply.
Thoughts ?
Continue reading...
The cottages are pme earthing, there are 2 phases split between the 4 cottages.
There needs to be a call for heat from 2 cottages which are on a different phase to the boiler, his wiring brings the supply in to a wiring centre to supply the zone valves / and tank stats.
There are 2 immersion tanks, one downstairs and one up, both zone valves are in the same location with a cable for the downstairs stat tank having to run through the house to the upstairs one.
He is adamant that i wire it the way he wants, he's installed 2 5 core cables to the wiring centre from the cottage to the wiring centre which there is totally no need to do as it only requires the call for heat to the boiler.
Wiring it his way will mean that both the tank stats, zone valves etc will all have a supply + phase on them from another location.
The prospect of not being able to isolate this wiring centre valves/stats both up and downstairs, i cant see as being right when either a no volt 2 channel programmer would do a far better job with a lot less wiring and would mean that everything apart from a single connection would be from the same supply.
There is a bit more thrown into the mix as one of the cottages has to use a wireless switch to be able to turn off the bio mass hot water but hes provided one with a SL output which is totally useless as that SL would have to be wired from the other supply.
Thoughts ?
Continue reading...
