I am looking at possibly upgrading our existing system with Hive, Tado or similar.
Hive is my current preferred option as I have seen a good deal on an approved re-sellers website.
Our current system is a two zone using TP5000 controllers.
We have a Gledhill Boilermate SP and GB20 boiler.
For those unfamiliar, the Boilermate was installed in a lot of modern homes in the 2000’s.
It has a “Thermal Store” (basically a tank of hot water in a heavily insulated compartment).
The heating works by pumping water from the store (once a valve opens) round the radiators to heat them up.
The system also supplies mains pressure hot water.
The cold water passes through a heat exchanger and uses the heat from the “Thermal Store” water to heat the cold water and make instant hot water.
Although there is a timer function for heating and hot water, the default setting is “Constant”.
So the boiler fires on one of two conditions.
1) The temperature of the thermal store has dropped below its preset (so the boiler runs until the temperature sensors indicate it is back to normal)
2) One of the zones calls for heat.
From what I have seen of Hive, we probably need the Hive Single Channel Receiver
I removed the cover from the downstairs TP5000 and found that it only has 2 wires.
These appear to be connected to
Brown - COM
Black - N/O
There are 3 possible connections on the tab
The unit has batteries installed.
I can only ask assume that there is no requirement for mains power to the unit.
The Boilermate instructions show a typical installation using the TP5000 units
It however describes the connections as 1, 2 & 3 vs A,B & C
1) which I assume is A is connected to Live
3) which I assume is C is connected to Switched Live
My thought process is this
Hive has a Live & Neutral Connection as well as
2 Heating Off N/C
3 Heating On N/O (see thumbnail image)
My understanding is that the Live & Neutral are used to power the Hive receiver.
So by connecting my Brown wire to Hive 1 and my Black wire to 2 Heating Off the system should work ?
The TP5000 is obviously a controller and thermostat built into one whereas the Hive controller is only the switching part of the circuit and the brains is the remote thermostat.
My other idea was to leave the other zone as is.
We do not use that room much, so it can continue to work off the TP5000 (I Hope)
So I am after some thoughts if my thinking is correct and anyone has come across the scenario with just 2 wires ?
There may well be a L,N & E tucked behind the TP5000 as I can see coloured wires that are in the wall behind the plate.
Otherwise I was going to take a spur from a mains socket to derive my L & N.