Waterfurnace pond-loop winter problems
Last May I installed a 5-ton Waterfurnace for my 3000 sq.ft. home with a pond loop. The pond is 6ft deep and 120'x60'. We live in southwest Michigan (hort. zone 6a). Cooling last summer was great, no problems at all. This winter is a disaster. The system goes into "fault" mode almost every day, sometimes more than once per day, and we can't get the temperature above 66 degrees. When the system is in the "fault" mode the compressor is turned off and the auxiliary electric heat runs by default. I shudder to think what my electric bill will be.
This autumn I got concerned about whether the system would heat enough in the winter and asked my dealer whether I should install a supplementary ground loop - he said no, we should be fine. I unfortunately did not know enough to turn the desuperheater off and I left a windmill-driven bubbler in the pond. The dealer's service man said that I should turn them both off (I did) but no improvement. He said that the coils are probably encased in ice and we may just have to wait until warmer weather melts the ice. Does this sound right? Is this system functioning correctly? Thanks
Thats a puddle not a pond
This sounds like a case of to little pond for to big of a loop.
I put a loop in a pond three times as deep and I have still been seeing really cold entering water temps. I think that the design of the pond loop needs to be tweaked because I added two extra coils to my loop just because cost wasn't a big issue.
I'm not confident that a pond at this depth would accomadate any size loop. And I definitly think that the bubbler taxed the whole loop system beyond recovery for this heating cycle.
Hopefully your geo contractor will work with you to resolve this issue. He probably was going on your information of the ponds depth, because I know that I rarely will measure a ponds depth if the homeowner seems to know the dimensions