I have an older house that has two HVAC systems, one for the main house and one for the big extension on the back. There’s the obvious issue of warm air rising. Come on man, have you never read the install manual for a newer thermostat. If you need one thermostat to control two identical HVAC systems, we at HVAC Surplus have your solution! Most all modern thermostats can do what you want to do without adding any relays. I have since learned that the Nest will need to bypass the … (Sometimes installing one thermostat isn't the best solution to the perceived problem. I had my former HVAC guy upgrade my electric furnace to a 2 stage system two years ago and he also replaced my thermostat. I have one … I have tried lately to stay out of the technically focused forums while drinking. Nest Thermostat-E. Happens to the best of us. All is required that you run 2 separate 18/4 wires from each system to the thermostat. So, stay in the shade and keep cool until the next time we meet in . Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. Contact a mechanical engineer, HVAC controls company, or your HVAC supplier for assistance on this approach.Summer is coming to an end, but it is still 110 deg F in Phoenix, and Dallas has record heat and no rain. The control panel regulates various temperatures in the house by activating dampers in the HVAC system. Components – Coils, Heaters, Motors, etc. Next, interconnect all the units together with a "common" low voltage leg. There are ways you can check what both the type of system you have and how many stages it is, but this usually involves taking a look inside your current thermostat … Once that is done, the contractor can measure the setting for the heat anticipator requirement of the thermostat. One of the thermostats display was out, so I went and bought a Nest without knowing exactly what I was in for and what my system entailed. Ask an Expert; Home Improvement Questions; HVAC Questions; I have one system for my home but have two thermostats. (Caution: some thermostat heat anticipators cannot handle the load of more than one HVAC unit). One… Customer Question. The #1 question asked by NEW MEMBERS. Answered by CJ439 2 years ago The first of the two popular methods to control two or more HVAC units with one thermostat is to eliminate all of the low voltage transformers in all of the HVAC units, and install one large low voltage transformer in one HVAC unit. Any newer thermostat should be able to do it. You see, we are all used to seeing that control panel as a thermostat, the brain of the … Yes... we are 20 years old. These dampers work like a valve system — opening and closing the air flow to your zones. Can I have 2 HVAC Package Rooftop units controlled by One Nest Thermostat 1 Recommended Answer 1 Reply 0 Upvotes. Accessories – Pumps, Cooling Towers, Evap Condensers, etc, Components – Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Welcome from the Editor & Electrical Forum Rules, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. . Likewise, the rising air will continue to provide warmth to the upstairs rooms without having to run your heater that often. Two or three units controlled by one thermostat in a proper installation shouldn't pose too many complications, but four or more should be reviewed for potential problems by your mechanical engineer or consultant.As expected, controlling two or more HVAC units with one thermostat is a job for a professional. To find out if ecobee thermostats will work in your home, please use our compatibility checker. Dont waste your time with the nest. The thermostat is an Ecobee3. "It's not that I'm smart, it's that I stay with the problem longer”. These thermostats all connect to a central control panel in your home. Looking at the first method, total up the volt-amps (watts) rating of all the transformers, remove them all, and put one large low voltage transformer in one unit. A thermostat is then installed in each individual zone. The master controller requires 110 volts and has it's own transformer for control power to the relays in the device. Our 20th year anniversary is May 21, 2020. Set your downstairs thermostat to be your desired temperature, and set your upstairs unit two degrees cooler. However, if you're only interested in getting one Nest, you can have a Nest for one system, and a non-Nest for the other. A single zoned system has many … This helps you determine which thermostat will be compatible. As companies seem keen on making "smart" thermostats, I'm sure they could design them to communicate with each other. Nexia ® Diagnostics works with Trane’s Wi-Fi-enabled thermostats to send real-time data to your trusted dealer (with your permission) on your system’s performance. If you have more than one thermostat for your low voltage system (for example, one upstairs and one downstairs), Nest’s Thermostat-E makes the most sense. I wanted to add some details: Currently I have two AC units on the roof that share returns and ducts, but are controlled by two thermostats separated by 2'. Daikin FIT system air conditioners and heat pumps, residential inverter air conditioners and heat pumps, two stage air conditioners and heat pumps. )•Will your building code require smoke detectors or economizers in the units since the total combined capacity of the new "system" probably now exceeds the code's maximum tonnage or cfm quantity for standard units?With the additional input from your customer/end user, we can proceed to select the most appropriate thermostat control method. A single A/C unit in a two-story home often produces no-win situations. For example, you can keep the temperature lower in the kitchen and higher in the bedrooms. One thermostat can be surface-mounted on the controller box or it may be mounted remotely. Thermostat technology has come a long way since mercury thermometers, and smart thermostats offer significant benefits, especially if you have a multiple zone home. Mysa This can reduce your energy costs by as much as 30 percent. If you only have one HVAC unit I would suggest adding sensor and saving the cost on the second thermostat. Two or three wire Thermostats. Finally connect to the thermostat and turn on the power to the units.The second method involves a master controller where each HVAC unit's low voltage wiring is run to separate terminal strips of that device. The only true knowledge is the pursuit of knowledge. In the winter, the opposite is done. Is it possible to wire two thermostats into one unit? Your home is already divided into two zones, and the Nest’s learning features will save you energy and ensure comfort. RH is continuous power for heating, and RC is contentious power for cooling. Typically, the home is divided into … Wiring two or more HVAC units together has the potential of burning out the low voltage wiring throughout all of the units. To prevent this from happening, make sure the units are properly phased. The also have 10 x 10 branch ducts, 1 each, that cool walled off rooms in the center of the plant. Your new thermostat will be clearly labeled with one of the following: Works with 1 Stage heat or cool: For use where you have separate heating and air conditioning units. These types of systems give more control over the heating and cooling system and provide individual control of temperatures in each zone. Crank the thermostat down to offset the natural warming in upstairs living spaces and it’s too chilly downstairs. HVAC control systems are quite dumb, relying on simple relays to turn things on/off. One Nest can't control both units at the same time, unless your system is wired for having just one thermostat control the whole house. I'm just trying to come to terms with why they would put a whole different thermostat in for the A/C and not just use a single unit. Zoned HVAC systems allow the building or home to be divided into two or more separate zones. It is possible to install a single central air-conditioning unit, with two or more thermostats, that can cool the house equally. Also includes the Daikin One ecosystem of indoor air quality modules, which provide an integrated solution for temperature control and air … The Comfort Zone. This works to … I have the Honeywell 9421C1004 thermostat with the EIM in my house on two separate units. As we do so, we must keep in mind an important point.Each HVAC unit/system has its own low voltage transformer. Gotcha I skimmed over it too quick I guess and didn't see where the white wire was going on the second pick on the first go-around (doh!) These rooms are not occupied on a regular basis, but at times they require a staff of two for 8 - 10 hours at a time. The lower level is set to 71 and the upper level is set at 68 or 69. This master controller can easily be installed in the factory with very little chance of wiring errors.Air conditioners with heat strips and gas heat HVAC units would require less wiring, fewer relays, and less space in a master controller panel box than would a heat pump. Stage one heat and cool means you have units that work either at full capacity or not at all, it’s like an on/off switch. The fact that zoned HVAC systems use air conditioning units with variable speed motors means that they use approximately one-third of the energy of a traditional system. Both units will always have the same temperature settings on their thermostats. It may be because a conference room is open across all the module lines, the building is one large room, or the end user has simply requested it.When planning how to control more than one HVAC unit with one thermostat, start by discussing the following with your customer/end user:•Should this building have a "zoned" HVAC system, or the standard one HVAC unit per one floor/module system?•How will all of the other rooms be affected if the thermostat is located in the main room?•Is the main heat load located in the room with the one thermostat?•What is the reason for the request? I'm guessing that I can connect the heat pump to the thermostat … Participate in over 40 different forums and search/browse from nearly 3 million posts. Post photos, respond to polls and access other special features. Ask an HVAC Expert for answers. Understood. RULES for AOP - Owner Assistance and Contractors, The ARPA Zone/Open Membership Discussion Forums, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories – Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. Yes sir now that I took my foot out of my mouth its a lesson learned! Two units at our facility cool the core of the our printiing plant. An explanation of why they would bridge the R to Rc on the heat thermostat possibly? But what you are saying is that it has to stay the way it is (separate) or that the way each has been wired is so they can be combined possibly? Therefore, I'd like to only have one thermostat that controls them both. This not only improves comfort but can also enable you to save money on utility bills. There are limits as to how small you can make the zones. This first method will require an HVAC service contractor. Can I run both units off the … Currently they're controlled by two separate thermostats, both something like this.The one that controls the until for the main house likes to randomly reset itself to 71° in the middle of the night, which often disturbs my sleep because it get too hot in my room and … Wire nut all the appropriate leads together prior to the stat. ecobee thermostats are compatible with most residential heating and cooling systems in North America, including gas, oil, electric, and dual fuel systems. Stage two (or multi-stage) means your system is capable of heating and cooling on both low and high speeds. A great thermostat network for owned or rental property, office buildings, retail, restaurants, and more -- Sensi Multiple Thermostat Manager offers facility managers the power to monitor all of their thermostats in a single dashboard. With separate central air conditioning units for each floor of your home, you can maintain a comfortable temperature for each defined space. In general, upstairs bedrooms will be warmer than the rest of the house. Connect one-on-one with {0} who will answer your question. There no wireless or wired remote sensors . A regular central air-conditioning system, by contrast, pushes cool air to all parts of the house. This is the point at which you start wondering what to do about the missing wires of the HVAC indoor unit. However, phasing the low voltage system once initially, may not create a permanent condition. Sorry, could you explain a little more about the Rc? RC and RH are called that for a reason. Many homes today have multiple thermostats - one upstairs and one downstairs. In the warmer weather, I set the lower thermostat to 77degrees and the main floor thermostat to 74. We have two thermostats with one furnace. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. In the future, if anyone switches a wire around, poof, the wiring in all the units will fry! This caution applies to the first control method below and usually is not encountered in method number two.The first of the two popular methods to control two or more HVAC units with one thermostat is to eliminate all of the low voltage transformers in all of the HVAC units, and install one large low voltage transformer in one HVAC unit.The second method involves using a master control panel.

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