Programmable Tstat with Adjustable Differential
wallace58
15 years ago
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Comments (14)
ryanhughes
15 years agolast modified: 9 years agosniffdog
15 years agolast modified: 9 years agoRelated Discussions
Programmable thermostat with steam heat?
Comments (11)Actually, z1700, I found some of the literature on my thermostat and discovered that it does have an "elective" EMR - ran through the program and sure enough, there it was. It was not enabled, so I did select it - but I have to say I wonder how much better that is than simply setting the thermostat to come on 30 minutes earlier than when I want heat (that seems to be about how long it takes the boiler to kick in to really producing heat)....What about when the temp is set to go down? Does the EMR also begin to drop early, so you'll be at the set temp at the scheduled time, or does it cut off at the scheduled time so the temp gradually reduces? Seems like if the EMR accelerates the drop in temp, I lose some of the benefit of the residual hear in the radiators, no? And spot90, that's a good suggestion to check the amount of gas I've used, rather than the cost, although since one month (or winter) can vary a lot from the next, that, too, has potential issues. Our gas bills do show the average daily temperature for the billing period as well as the same month the prior year, so maybe I can find similar months. It's worth a try, if I still have any of the older bills - it's been 3 years since the boiler was replaced, so I may or may not have those. Once again, thank you all for your input - it's much appreciated!...See MoreLooking for T-stat that will changeover daily.
Comments (6)There might be some at home depot or the like that can switch between heat/cool and have an adjustable deadband. If you have a heat pump the vision pro series I am speaking of also have the ability to lock out the heat pump if it gets super cold out or lock the gas/strips out when the temp outside is moderate. If you have a heat pump and with what you are describing the pro series with outdoor temp sensor could easily pay for itself in a few years or less. I left a link to the honeywell site and there is a plethora of helpful information on YouTube that is more 'hands on' with the units. Here is a link that might be useful: Honeywell page to find what fits your needs...See MoreGeothermal Loop Control - Part II
Comments (17)This morning I caught the system just as it turned on (my ears are now trained to listen for the click of the tstat and the fan coming on.) This time, when the tstat started heat all by itself, the Aux Heat call did not come on. I have a feeling that anytime I try to force the heat on myself, the tstat is seeing a large enough delta between set and actual temp that it is kicking AH on. I will have to watch the operations over the next few days to see if it consistently works without AH. In the mean time, the breaker to the heater pack is off to avoid the toaster. I have decided to send an email to Honeywell tech support on the CPH setting for my tstat. Now that I understand what the CPH setting does, I need to know how the logic is implemented. For example, my tstat setting for Compressor Cycle Rate is set to 3. Does the tstat bleed these 3 cycles per hour (max) uniformly over an hour of time - or does it simply allow 3 on/off cycles in rapid succession, and then no more for the rest of the hour. If the allocation is uniform across an hour, then the Aux heat setting (which is currently 9 CPH) could be adjusted lower to keep Aux Heat from popping on so quickly - like when I increase the tstat setting by 2 degrees. Again - if it is a uniform distrubution of on/off cycles the tstat would permit Aux Heat to come on every 3 minutes with a 9 CPH setting and that is too frequent. So the CPH adjustment may in fact be part of the solution. I have also discovered a nagging issue with my second story heat pump. That unit is actually zoned - where 3 bedrooms each have their own tstat. My guess is that the CPH setting for each tstat is set to the recommended default (3 CPH) which means that there are actually a total of 9 CPH allowed (3 for each tstat). That explains why that unit kept cycling so frequnectly on me last winter. I believe that a CPH reduction is probably warranted in each of those tstats and that would reduce the number of total HVAC cycles upstairs. The downside is that some rooms way have a wider tempertaure swing and then a longer run to get up to the set temp. But I would rather have a reduction in cycles as long as the swings are not too big (which could cause Aux Heat to pop on). Imagine Room 1 calling for heat and getting serviced - then shutting off. Then a few minutes later, Room 2 does the same thing, then Room 3. If I stretch out the ON/OFF times in all rooms, I will increase the probability that heat calls will overlap. I will check on the L line. I believe that my tstat does not use L becasue I get no alarm lights when the compressor locks out - and I would like to have that. There have been cases where the compressor has locked out and the only way I knew it is when it got very cold in the room and I opened up the heat pump cover to see the red light on the contoller....See MoreIs this a programmable thermostat?
Comments (6)Two programmable room t-stats I like, do a search for each one: LUXPRO PSP511LCa & ACE ATX 1500 both low cost & have the very important 1 to 9 Temp-Swing setting so you can adjust runtimes; the off-time will be determined by how well weatherized your home is, along with outdoor conditions. Each cycle, you want the burner running 13-minutes or longer. Keep track of the runtime & ON-time to the next On-time (one complete cycle): divide the complete-cycle-time in minutes into the burner runtime in minutes; then multiple that fraction by the Btu/hr OUTPUT of the furnace. Always do load-calcs so you know whether there are duct leaks or other problems causing a poor performing system. Print results; because U can't save it; unless you use the 'Sniping Tool' to capture an image of the completed calc. - which you can even upload to this forum thread Here is a link that might be useful: Free Whole house load-calc...See Moreryanhughes
15 years agolast modified: 9 years agosniffdog
15 years agolast modified: 9 years agowallace58
15 years agolast modified: 9 years agoryanhughes
15 years agolast modified: 9 years agozl700
15 years agolast modified: 9 years agowallace58
15 years agolast modified: 9 years agoryanhughes
15 years agolast modified: 9 years agozl700
15 years agolast modified: 9 years agowallace58
15 years agolast modified: 9 years agosniffdog
15 years agolast modified: 9 years agowallace58
15 years agolast modified: 9 years ago
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