Hi
I am in the process of replacing an old Honeywell room thermostat (no model number but probably about 25 years old) with a digital programmable thermostat from Horstmann (Centaurstat 7).
There are three wires for the existing thermostat (red on 1, blue on 2 and yellow on 3). Reading various posts on this subject, I have assumed that red is live, blue is neutral and yellow is the switched live. The new thermostat has four connections as follows: 1 L (Line), 2 Load (Heat), 3 Load (Cool) and 4 N (Parking).
I have connected the red wire to 1, the yellow wire to 2 and the blue wire to 4 (to park the neutral as this is not needed).
When I switched on the programmer, the heating came on immediately, regardless of the settings on the thermostat. My first thought was to connect the yellow to 3 but the documentation clearly states that this is for a cooling system switch.
If there is anybody with experience with these thermostats then I would be grateful for your comments.
I am in the process of replacing an old Honeywell room thermostat (no model number but probably about 25 years old) with a digital programmable thermostat from Horstmann (Centaurstat 7).
There are three wires for the existing thermostat (red on 1, blue on 2 and yellow on 3). Reading various posts on this subject, I have assumed that red is live, blue is neutral and yellow is the switched live. The new thermostat has four connections as follows: 1 L (Line), 2 Load (Heat), 3 Load (Cool) and 4 N (Parking).
I have connected the red wire to 1, the yellow wire to 2 and the blue wire to 4 (to park the neutral as this is not needed).
When I switched on the programmer, the heating came on immediately, regardless of the settings on the thermostat. My first thought was to connect the yellow to 3 but the documentation clearly states that this is for a cooling system switch.
If there is anybody with experience with these thermostats then I would be grateful for your comments.