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- 22 Sep 2016
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Evening all,
I took the plunge over the weekend and bought a Nest 3rd Gen Thermostat.
Currently I've got a Honeywell CM707 thermostat connected to my Potterton Powermax HE boiler, using 2 cables to connect to Tr and Tl on the boiler. The Honeywell is programmable so I have the boiler programmer set to 'always on' and the thermostat just calls for heat - easy.
Replacing it as-is is straightforward, however the Nest can control Hot Water as well, and the Powermax has a hot water tank...opportunity strikes...
On the installation wiring diagram for the Powermax, there is a facility for a Remote Programmer, with lines for HWr, HWl, CHr, CHl. The obvious thing to do is connect those up appropriately to the Nest and job done, however the diagram for the remote programmer option suggests the Tr and Tl (Room Thermostat) lines should still be connected to a Thermostat (which in this case would be the Nest).
So, my questions are:
1. Can the Nest be used as a Remote Programmer in this way with this boiler?
2. If so, do I need a Room Thermostat on Tr and Tl or can I leave them disconnected (or looped?)
3. If I need a Room Thermostat, could I connect Tr and CHr, and Tl and CHl to the same points on the Nest?
Apologies for the length of post and numerous questions; I am competent (mostly) but want to be absolutely sure of what I'm doing given the change of configuration.
Thanks,
Jamie
I took the plunge over the weekend and bought a Nest 3rd Gen Thermostat.
Currently I've got a Honeywell CM707 thermostat connected to my Potterton Powermax HE boiler, using 2 cables to connect to Tr and Tl on the boiler. The Honeywell is programmable so I have the boiler programmer set to 'always on' and the thermostat just calls for heat - easy.
Replacing it as-is is straightforward, however the Nest can control Hot Water as well, and the Powermax has a hot water tank...opportunity strikes...
On the installation wiring diagram for the Powermax, there is a facility for a Remote Programmer, with lines for HWr, HWl, CHr, CHl. The obvious thing to do is connect those up appropriately to the Nest and job done, however the diagram for the remote programmer option suggests the Tr and Tl (Room Thermostat) lines should still be connected to a Thermostat (which in this case would be the Nest).
So, my questions are:
1. Can the Nest be used as a Remote Programmer in this way with this boiler?
2. If so, do I need a Room Thermostat on Tr and Tl or can I leave them disconnected (or looped?)
3. If I need a Room Thermostat, could I connect Tr and CHr, and Tl and CHl to the same points on the Nest?
Apologies for the length of post and numerous questions; I am competent (mostly) but want to be absolutely sure of what I'm doing given the change of configuration.
Thanks,
Jamie