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I recently had to swap out my circulator pump (it was a Taco 00R-MSF1-4IFC, Taco technical support recommended the 0015e3-f4 as the current equivalent). I,m curious about how much head pressure my system has because I've noticed that the performance curves for the three speeds are not the same...

It's the MXZ-3C revision. I don't have (and can't find) a users manual that really goes into the compressor itself. I downloaded the service and install manuals for the compressor but they don't seem to go into that detail. On another note I lost power for over a day during one of the recent...

How can I tell when it runs a defrost cycle?

LOL saw the movie and read the book. I think it's a cold start, at least most of the time. Fan definitely stops, I think compressor totally stops, and air is not warmer than normal when it starts blowing. As long as not doing damage or really killing efficiency I guess I shouldn't worry too...

There is no light to tell when the GLs are running in defrost. I have checked the outdoor unit when running below freezing and never noticed any overt frost etc on the fins but maybe didn't look at the right time or place. I have suspected that sometimes when the two green lights come on (manual...

Dana I took your advice and have been heating with the minisplits for several days (the two GL09s). I did observe last night (with outside temps in the mid 30s after a day that went up into the 40s) that I was getting heat cycles based on how long the vanes were in heat position) for 10 or 11...

Thanks for the math showing where the efficiency comes from. Most of my experience heating with the minisplits is when the outdoor temps are in the 30's or higher. The seem to run a lot of the time but not pushing a whole lot of volume. The seem to start off a little above room temperature and...

Thanks Dana, I actually do have a 2 1/2 ton Mitsubishi Mini-split system. There are 2 9k BTU units in the living area ( one in the master bedroom and one in the living room that opens to the dining and kitchen area). and a single 12k BTU unit in the basement. I don't usually run the unit in...

The 2.6 GPM at 77F rise was the one major negative I picked up on from the brochure. It is a 2 bathroom house but I currently occupy it alone, and am not in the habit of running the other water using appliances while showering. Another adult would be fine, but children would find it hard to...

Thanks for the sanity check Dana, if the worst case scenario amount of short cycling I may get on a mild day isn't abusing the boiler I won't worry about it so much. I did see pick up some literature on the Lochinvar Nobles at my propane suppliers showroom (too bad they do have an operational...

Dana, thanks for the degree day factor speculation, it seems to make sense so you are probably right on. A few years ago I did borrow an infrared thermometer and placed tape in several spots. I dont think I ever got a delta over 15F once the boiler was running. Last night I decided to put the...

Dana thanks for the reply and encouragement to use return, I will have to wait and see if we get any truly cold days during waking non-working times to try to time the burns and count the cycles. If I recall the burns themselves are a bit short in return and the the water continues to circulate...

Dana, I am wondering what you thoughts are as far as running this unit in return? This unit was a straight replacement for another of the same model that was experiencing the error code 12 problem. My builder replaced it (on their dime) but we did try running it in return mode for a month or...

Hi Dana, The primary loop is copper, I don't have the Navien manufactured manifold. I do have the remote (its's mounted next to the boiler), and the manual (but it doesn't show any adjustment for difference or delay before flame-out and re-fire). It is set up for supply control but have tried...

NY_Rob- you are obviously correct. But another user here that I have corresponded with had the outdoor reset on this series of Navien and could never really dial in a good curve (I believe they only have limited presets). Maybe I am basing this on anecdotal evidence, but I didnt see other users...

Thanks to everybody for your replies. Dana: here is the information you asked for and anything else that I can think of that might be important. The boilers is a Navien CH210ASME, No outdoor reset. Single zone plumbed the usual primary/secondary. Boiler in the unheated basement. Circulator...

Thanks Dana. Last night after a somewhat mild day, I noticed the boiler drop supply temp from around set point by 20 or more degrees. But it didn't look like it shut the flame off like a short cycle, maybe it dropped back a stage? The supply temperature did start to climb but the heat call ended...

When a boiler modulates I understand it is reducing the firing rate. Is the most obvious evidence of this seeing the boiler drop the supply temperature below the set point? I would assume this happens when the delta drops below a certain number, and the boiler reduces the supply temperature...

Yesterday I noticed my three year old Navien CH201ASME go through the same 2 second on- 2 second off at start up like the old unit did. It didn't reach 20 times and error out with a code 12, but it did do it again on the next call (maybe not as many times), but haven't noticed it since. I just...

Hey Jac- I'm with you on worrying about everything. I had Mitsubishi Mini-split air conditioning installed during the summer and I made sure that they could produce enough heat to get me by in a pinch if the Navien gave out. I used them to heat in the fall and my electric bill was still quite...