Browse Forums Heating, Cooling & Insulation Re: Air flow from the vent when the zone is OFF 13Mar 19, 2018 12:40 am It really comes down to how much it annoys you and if it will benefit your installation. They are marked as optional though hence why they were probably not installed. You might be paying for the other sensors to be installed if it wasn't in the original scope. How beneficial they are really comes down to how your house is laid out, how the zones are split up and location of registers in each zone. With a single main return air intake, all the return air needs to flow back to that point. If there's factors which could affect the accurate measurement of the incoming return air such as solar load, then you'd definitely see a benefit to sensing across multiple zones and averaging the readings for control. hth Re: Air flow from the vent when the zone is OFF 14Mar 19, 2018 5:48 am Thanks mate I think it makes sense to leave it as-is with one sensor. Is main RC, main remote control sensor and sub RC sub remote control sensor? Meaning the sensors are in the remote control and senses based on wherever the remote control is? They didn't give me any remote control. Just the wifi app so if what I'm guessing is right, then those 2 sensors are not applicable in the first place. Also the other sensor is outdoor sensor. Why would someone assign it to any indoor zone in the first place? Trying to understand. Thanks so much! Re: Air flow from the vent when the zone is OFF 15Mar 19, 2018 1:03 pm Every manufacturer uses different terminology. Main RC is generally the sensor in the wallpad controller, sub RC is generally the coil sensor but don't quote me on that. Outside air sensors are generally for ambient lockout function or for economy control. Hth Re: Air flow from the vent when the zone is OFF 16Mar 19, 2018 7:54 pm Bels Every manufacturer uses different terminology. Main RC is generally the sensor in the wallpad controller, sub RC is generally the coil sensor but don't quote me on that. Outside air sensors are generally for ambient lockout function or for economy control. Hth Hi Bels, I did a temperature test as suggested, please see below observation. Zone 1 sensor set to the following - 1.) IC (Indoor Unit) = 29 degree C Note: IC sensor was the setting I had for all zones when the AC guys finished. Works well. 2.) Main RC = 30 degree C When I set the zone 1 sensor to Main RC, I get the following error on the controller display after a few mins. Error code - 5191 Error unit - IC Address - 001 3.) Sub RC = 8 degree C (8 blinking) 4.) Optional Sensor 1 = 8 degree C (8 blinking) 5.) Optional Sensor 2 = 8 degree C (8 blinking) With this, can we conclude whether additional sensors have been installed or not? It looks like the unit works based on only one sensor called 'IC' (Indoor Unit). Is it all good? or should I contact the air con company and ask about other sensors etc. Appreciate your time & help again. Re: Air flow from the vent when the zone is OFF 17Mar 19, 2018 8:50 pm 1. return air sensor 2. unsure of what this error is as it's not in my list of error codes. You may need to contact the installer if you need to find out what this is as I'm not sure of what your model of unit is. 3. likely not installed 4. Likely not installed 5. Likely not installed Re: Air flow from the vent when the zone is OFF 18Mar 19, 2018 9:10 pm Thanks Bels, With this setup, is it all good (or) should I ask for more sensors? I would assume this is the standard installation by the air con guys but would definitely have a chat about the sensors and confirm. And the model numbers below. Model no: PEA-RP140GAA Indoor unit PUHZ-RP140VKA2 Outdoor unit Re: Air flow from the vent when the zone is OFF 19Mar 19, 2018 11:23 pm There's nothing wrong with the method of control of your system. The air supplied to the active zones still returns through the common return air intake and sensed by the indoor unit sensor. That said if you were after more exact control then you'd want sensors in each zone. Now with averaging sensors, if a sensor is in a zone with a high solar load, it would raise the averaged temperature sensed and bring on greater cooling or in the example of heating the opposite. How do you feel your system is operating? Are the conditions comfortable in your house? Is there excessive or inadequate compressor on cycles? Do you feel there's room for improvement? Sometimes people chasing absolutes end up dissatisfied or unhappy with an otherwise well functioning system. A mentor long ago knocked it into my thick head that air conditioning is an inexact science. hth How do you remove one of these ceiling air con vents? And is it possible to disconnect the duct joined to the vent from inside the house, without going into the roof cavity? 0 6046 Good luck with it. 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