2 zone heating system problems
#1
02-11-14, 10:47 AM
2 zone heating system problems
I am having issues with my 2 zone baseboard heating system. It seems like only one zone will work at a time. I found a thermostat wiring diagram in one of the threads here and will be checking all of the wiring tonight when I get home. The odd thing i have noticed thus far is that the thermostat for the 1st floor (honeywell programmable) has 4 wires going into it. The thermostat on the second floor is a simple 2 pole thermo. There is no cooling system on the chain. We have window units only. Is this normal? Is there a reason for 4 wires on the programmable thermostat?
#2
02-11-14, 12:20 PM
Erik,
Generally a simple programmable t-stat for hot water only requires 2 wires.
If you have AC or warm air with a fan there can be more.
What kind of t-stat is it. Make & model and is it possible to take pics of the t-stat and wires.
Do you have zone valves or pumps to control your zones and what kind of zone valves if any.
Generally a simple programmable t-stat for hot water only requires 2 wires.
If you have AC or warm air with a fan there can be more.
What kind of t-stat is it. Make & model and is it possible to take pics of the t-stat and wires.
Do you have zone valves or pumps to control your zones and what kind of zone valves if any.
#3
02-11-14, 12:37 PM
Many thermostats can be wired with an 'extra' wire (called a "common" wire and connected to the "C" terminal in the thermostat) in such a way that the thermostat (even if it is battery powered) can be powered from the boiler controls.
Four wires though? not usual in a 'heat only' setup.
What terminals are the four wires connected to? and the bigger part of this question, what are they connected to at the other end, by the boiler?
Four wires though? not usual in a 'heat only' setup.
What terminals are the four wires connected to? and the bigger part of this question, what are they connected to at the other end, by the boiler?
#4
02-11-14, 03:48 PM
Well if you have AC as well as hot water you should have a minimum of 5 wires. Rw and W for your hot water heating Rc G and Y for your cooling. You may even have an additional wire for the C terminal. But 5 is the minimum.
