I’ve had a local hvac tech maintaining my FHP units for about 5 years. Started using him when I began noticing increase power consumption. Over the last 5 years my power consumption has tripled.
System description: I have 2 FHP’s
FHP Model -GT042-1VTN, SN CG090069D
FHP MODEL - GT026-1CSN SN CG0990070D
Both have cupro nickel cores, gt042 desuperheater but its never been used. System was installed in 1996 originally an open loop system but converted in 1999 to a closed loop. Loop consisists of 4 vertical loops 225 feet deep for a total of 900 ft loop. 2 Bell & Gossett PL 36 pumps for the gt042 and 1 the same for the gt026
My problem seems to be with the gt042 although I have another problem with the gt026 (it slowly leaks Freon somewhere).
My hvac tech now recommending a replacement plus replacing the existing pump system with a new flow center enclosed unit. I don’t believe he did any real trouble shooting other than to check the Freon levels.
Its now mid February in New Jersey with one of the coldest winters we’ve had. The system is running almost constantly and my loop temp is steady at 45 degrees. I have little knowledge of hvac but this indicates to me the system is not extracting heat. I’ve measured the pipe temp going into the unit and out with maybe ½ to 1 degree delta. It does produce some heat, the air coming out is in the low 80’s. My understanding is it should be in the 90’s.
I’ve reached out to the mfg and all I get is a list of distributers. I did contact one and he confirmed that what I saw was not right. He suggested it could be scaling in the heat exchanger.
I’m at my wits end with this system now and its costing me thousands of dollars in wasted power now.
Is it possible there is a valve stuck? Does scaling sound correct with the cupro nickel core and a closed loop? Is there something else I should be checking?