Without battery backup, what happens in a power outage? Is there internal memory that keeps the settings and how long, and is thermostat still usable?
206127
No battery backup in mine. However if the power goes out, your furnace won't run it's fan anyway. When the power comes back on, the thermostat will resume as left off. We have ours in a vacation home and the power goes off intermittently throughout the winter. The thermostat is always reset and functioning when I check back in. I really enjoy this thermostat for checking in on the house and the external temperatures remotely, and for turning on the heat before we arrive in the winter.
1933314
The unit is powered by using the AC power supply, and it can also be powered using 3 AA batteries, you should use both together, in a power outage it will switch to using the batteries. Also the frequencies are stored in EEPROM non volatile memory, which means that it will stay in memory even when there is no power.Thank you.
1177201
It does *not* have a battery backup. Some settings survive a power outage, but some do not. For example, the setting to *not* go into power saving mode is not preserved; the "standby" mode - you have to reset the "standby" power level whenever the power comes back on - to disable that feature is you set the "standby" power level to 0 (zero) watts. The option to turn off the PIR motion detection feature does keep its setting when the power is restored. I don't know what happens to other settings that I do not change from their default values.
2056048
This is a wired thermostat. While the unit does have internal batteries, I believe that they are designed for backup since the primary power should come from your system.
823700
It's been quite awhile since I installed my timer and I don't remember now what number it was----but I know that it did take a back up battery. Are you sure your's does not? I've never seen one that didn't? But I suppose that it's possible that the newer models might use a system that won't dump your settings when the power goes off. I haven't researched your model number so I can't say one way or the other for certain.
138274
t requires 2 aa batteries to store info, and it gets wired up to the back panel. The front of the thermostat can be detached from the back panel. I had my a/c guy install the unit, but it's not very hard to do it. It comes with instructions.
896313
Yes, the thermostat has batteries which retain the settings for power outages.
1961641
The C wire provides the power for the thermostat. The batteries in the unit are only for backup purpose when your power goes out. You need to get new wiring put in from your unit to the thermostat location with a C wire.
1507886
it does not have a battery backup, but "Power outage: The screen is blank. Only the time must be set if the outage lasts more than 4 hours; all other settings and programs are permanently saved." This is from the direction sheet. I do like the unit!
1570229
This device, the P4400, will reset all of its timed measurement values to zero if power is lost or the device is unplugged. The P4460 has "non volatile" memory, using a battery to provide the necessary voltage to power the (S)RAM memory, which means that it will not lose the data if power to the 4460 is lost. The P4460 also will let you input the cost per KWH from your provider to calculate the cost to operate the appliance over a week, month and year (assuming that your use is the same during the extrapolated period as it was during the measurement period). For me the data retention feature is well worth the extra $4 since I want to keep track of the energy used by a window air conditioner which will vary by the outdoor temperature, the sun hitting the building, the humidity, etc.
1483794
No they don't have battery back up. They are great though and I now have them in every room of the house running baseboard heaters. With the exception of the one running the gas fireplace. Battery back up is usually found in the programmable thermostats so it will save your settings in the event of a power outage.
643926
Yes, there is built in backup. I don't know how long it will last, but definitely long enough for the typical power outage. Mine has been unplugged for over a day now and the display is still working (unlike the timer itself, which is permanently off, and ready for recyling).
480077
Its required to be plugged in to work. There is also no battery backup so when the power goes out or it is unplugged all the settings are lost.
2056046
If you don't mind that the back light will not be constantly on, you can run this thermostat off of batteries.If you have the wire providing power to the thermostat, you can set the back light to stay on which is very nice at night. The batteries at this point provide backup, but then if there is no power, the fan in the house for the HVAC system wouldn't be working either. It's just there in that case to hold settings including the time and date.
1462302
Funny you posted this question. I just had about 8 power outages in one day. The wine cooler came back on without a problem after each one.
1483797
No. It is just an electronic thermostat. And BTW it has been installed and is working very well. I may order some more to replace the old mechanical thermostats that are getting some age on them. I do have a thermostat which I use to control another rom that is programmable which will stay programmed during short power outages but it does not have a replaceable battery Hope this helps.
486535
There's a small lithium cell on the printed circuit board that keeps alive the settings you have made. Its major power draw is from the control wires, however. The one I have is a GREAT thermostat! Smart as hell, and I have it running my AC, my furnace, my humidifier, and my powered whole-house ventilator. I hooked in its outside thermocouple, and it keeps track of when to run a defrost cycle on the ventilator. I recommend it unreservedly, as my on-line review makes clear.