I have posted a few times and now have a 90 day in service update. Installed: 2T climatemaster T27 Downflow HWG...with pretank prior to WH 300' vertical loop w/20% methanol...jumper clipped for LWT less than 30deg. F. 10kw electric aux 30 day filter at filter grill in living space and 2" pleated at unit. Data is being gathered on: Stop/Start 1st stage / 2nd stage run times (this is determined by static pressure at the return) SAT RAT EWT LWT OAT Static pressure between filters Static pressure across the final filter. Here is what my observed evidence indicates: 1st stage...4 degree Delta T (EWT vs. LWT)....equals a 20 degree rise across coil. 2nd stage..6 degree Delta T (EWT vs. LWT)....equals a 25 degree rise across coil. 2nd stage is determined by the static pressure change. I have calculated about 10Kbtuh in 1st stage and 15Kbtuh in second. I have checked loop pressure drop across unit and think the flow may be 5gpm. My lowest LWT has been 36 deg. F. General Unit operating characteristics: When OAT is below 35 deg. F. the unit runs in 1st stage and cycles 2nd on/off. When OAT low is near 21/22 deg. F. the unit may call for AUX. I just wired it in and it has come on twice in two mornings for about 15 to 20 minutes. HWG is plumbed and wired in. I do not have sensors on that system yet. I will take readings on water in to tank, water out of tank, water feed to water heater, and domestic into the house. This should give me a complete compliment of data on that system. I am trying to decide if I should be running that system in the winter. Our incoming domestic is from a spring. It is very, very cold at this time of year. In the past the incoming line has froze. It runs along bluff rock and has only woods duff as covering. We came from a dual fuel with propane backup. I don't have energy cost/savings yet. I am trying to scavange some energy monitors that can interface with my data controller. If not, I will use some HOBOs I have, as soon as I can dig up the cable used to program. Well that's about it. I do have one question: what is the anticipated BTUH of the HWG and would that heat be transfered to the house if the HWG were to be disabled? Otherwise I would be very appreciative of any feed back as to how my unit is running. It seems to be on track according to the manufacturers data. It started right up and I have only changed my pre-filter since start up. Thanks guys for any input. Steve
The HWG is roughly 10% of the output of the heat pump. If you disable the HWG, the heat goes into the house. Thanks for the update. Where do you live?
We live in middle TN Thanks, We live in middle TN. Does my data look reasonable? The house is very comfortable, the temp seems to maintain within a degree or less, and the unit is super quiet. I like the sound of a good running compressor.
