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I have a two zone system and two thermostats. I

I have a two zone system and two thermostats. I want to control both zones from one thermostat. The control is a L8124. Can this be done?

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This can be done is this a furnace or a boiler system?

Posted on Feb 01, 2010

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How do I connect a 24v damper motor with 6 colored wires red white yellow green blue black to NO COM NC terminals.


Choose two colors of the thermostat wire, and connect them to the NO and COM and connect them to the zone control board leads for the zone intended. Almost all zone valves spring return open when deenergized. So ensure the zone valve is open with the system is off. At the base of zone valve there is a set screw that needs to engage the damper valve shaft in the open position with the motor in the spring release position. Most zone valve are 90 degree moment from full open to full shut. If you have a Carrier zone valve, they go full open to full shut in 45 degrees of motion. Your open stop need to be set so the valve stops in the full stop position.
To help understand the operation of a zone system, say you have 2 zone system and zone 1 thermostat initiates a heat or cool demand. Zone 2 valves energizes and shuts and zone 1 stays open and allow air to heat/ cool zone 1. If zone 2 thermostat simultaniously initiates the same heat/cool demand, the zone 2 valve opens and both zone heat/cool. When either thermostat is satisfied the opposite zone valve closes and when both thermostat are satisfied both zone valves open.
Hope this helps you understand zone operation. The same works for higher multizone systems.

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1 Answer

I have a two zone water baseboard system... I installed a new zone valve to the upper zone which was not calling for heat.. the only heat it got was when the lower zone was circulating... Now the upper...


Good clues to work with--
Let's review how you wired up the Zone Valves, in relation to the Boiler Control panel...

You say the upper zone does NOT SHUT DOWN--
Does that mean it is OPEN ALL THE TIME?-- (even when the circulating pump is OFF? )
That sounds like the thermostat is not even in the circuit, then.

Have you been able to cycle each of the valves thru their cycles-- Open- and then closed?
-- It almost sounds like you have an interconnection between the two valves-- is this possible?

Each Thermostat has to control its valve only...
and most systems do this thru a control panel at the boiler--
So-- How is your control panel connected to the 2 thermostats, and how are the 2 zone valves connected to the Control board?

Are you following a wiring schematic for hooking the valves and thermostats to the control board?
There should be a schematic with the new valve you must installed, right?
did you wire it like the instructions showed?

Make a few more tests, and get back with us--

Mack B

Jan 18, 2011 | Heating & Cooling

1 Answer

We recently had Marley Double line break interrupter Thermostats installed as we could not turn our old thermostats "off". The lowest setting was 5'F. The heaters are in our cottage and when we...


Hi zone controlled thermostats are controlled normally by a master control stat that is wired ( linked ) to each zone. If you had them installed, they should have left you with the sequence of operation to explain to you how these stats work, and what to check in case of light trouble shooting? This I would insist on getting from them.Yes, I am sure they will click as each one is energized, but like I have said on all commercial heating and cooling thermostats that are zone controlled, even on a residential application, they came with a master control that sensed the temperature in that area where the zone covered, and the master received a signal to shut off the zone and automatically checked the other zones to see if they were calling for heat or cooling and would control the zone as needed. It doesn't make sense to me to have lets say 6 zones you are covering in the area of your cottage all alone like a thermostat.The click would be that it is either turning on the heat, or turning it off. This would be OK I assume, if they are controlling the heat and shutting the heaters off when you want them off, to save on your heating bill, but a programmable thermostat would do the exact same thing as the zone controllers, as these are used in office buildings, and for controlling hot water valves and dampers in the ceiling, as they have zone sensors located around the building to sense the temperature and send it back to a main controller. The zones are called slaves to this controller.I have never heard of this brand, most controllers for zone control are Johnston, Honeywell, Barber Coleman. I'm sure they are good, but I will need to find the sequence of operation, which I will get right on now. Hopefully, I can find out. If not, go back to the installer to get the paper work he should have left you explaining all to you and showing you the schematic on how they are arranged and operated either alone, or together. It just sounds to me like they are a digital sensor that senses the temperature, and maybe preset, or is adjustable inside for a certain comfort temperature, just like a programmable thermostat would do in this case. Please do what you can, and rate me on this, as I know you will be kind, but without a main control, I sincerely believe you are back where you started.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Industrial, Commercial, & Residential Contractor

Oct 28, 2010 | Heating & Cooling

1 Answer

Valve replaced , but 1 zone out of 3 no heat when


Hello. Each zone in you home has one thermostat controlling one zone valve. Generally, when a thermostat is calling for heat the zone valve opens and the circulating pump comes on to move the water around that loop. If your other two zones are both working as they should and you now have a new zone valve on the third loop I would suspect that the thermostat is faulty. Regards, Joe

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1 Answer

I have just installed underfloor heating with 4 zones. I also have the existing radiator system. The radiator system is currently programmed to come on and off twice a day but has no room thermostat. We...


You say you have3 rooms on the underfloor system that will probably require different temps. You said you have 1 zone valve for the under floor system. You can not control all the rooms with different thermostats and only 1 zone valve. You need more information and professional help here. I can give you more advice too...

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Honeywell T87f 3855 Doesn't Activate Heater


thats becaue you need more than this zone working like you said about the master/slave this zone is a slave.

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try removing power from t-stat and leave off for one minute and power back up see if resets

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It is possible the relay on the zone board is bad, You can test the thermostat if you own a voltage meter. It is possible for the thermostat to display and still be bad.

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