Hi,
First post to the forum. Our house has radiant floor heating powered by both 1) a geothermal water-water heat pump (Carrier 50YER060) and 2) propane-fired boiler (triangle tube prestige solo 175). The two heat sources heat a hw storage tank for the radiant heat system. The tank has a Ranco tstat that calls the sources for heat, the heat pump is primary with a target of 120* and the boiler is secondary with 125* target.
The radiant is piped to a kitchen area (concrete slab; tstat set at a steady target) and first floor (largely viega climate panels under hw floor; I have these tstats set for a 2* setback at night, coming back to target starting 2 hrs before I want it). We live in New England, outside temps have ranged from 15* a few times to 20s and 30s lately.
My question: the heat pump is often locking out (I have removed the cover and can see the LED rapid flashing.) shorting the test terminal gives me a code 2 “HP fault”. When I clear the code, the pump comes back on, but runs variably for 5-10 minutes before throwing another fault (same code 2 HP fault), which is a slow LED flash. The fault clears by itself after 5 min, pump runs a shorter cycle (3-5 min), and then throws another “fault retry”. Lather rinse repeat, third time the pump goes back into lockout.
The pump is definitely heating the circuit. The hw tank thermostat reads anywhere between 85* (first thing in the morning, presumably the pump locked out hours before) and 107*. I have not noticed that the pump cycle times are related to the hw tank temperature (under theory that pump may be approaching efficiency limit at higher temp).
Is this cycle time of 3-5min, maybe as much as 10 min normal for a geothermal water-water heat pump? Or do we need to call a tech?
Thank you
First post to the forum. Our house has radiant floor heating powered by both 1) a geothermal water-water heat pump (Carrier 50YER060) and 2) propane-fired boiler (triangle tube prestige solo 175). The two heat sources heat a hw storage tank for the radiant heat system. The tank has a Ranco tstat that calls the sources for heat, the heat pump is primary with a target of 120* and the boiler is secondary with 125* target.
The radiant is piped to a kitchen area (concrete slab; tstat set at a steady target) and first floor (largely viega climate panels under hw floor; I have these tstats set for a 2* setback at night, coming back to target starting 2 hrs before I want it). We live in New England, outside temps have ranged from 15* a few times to 20s and 30s lately.
My question: the heat pump is often locking out (I have removed the cover and can see the LED rapid flashing.) shorting the test terminal gives me a code 2 “HP fault”. When I clear the code, the pump comes back on, but runs variably for 5-10 minutes before throwing another fault (same code 2 HP fault), which is a slow LED flash. The fault clears by itself after 5 min, pump runs a shorter cycle (3-5 min), and then throws another “fault retry”. Lather rinse repeat, third time the pump goes back into lockout.
The pump is definitely heating the circuit. The hw tank thermostat reads anywhere between 85* (first thing in the morning, presumably the pump locked out hours before) and 107*. I have not noticed that the pump cycle times are related to the hw tank temperature (under theory that pump may be approaching efficiency limit at higher temp).
Is this cycle time of 3-5min, maybe as much as 10 min normal for a geothermal water-water heat pump? Or do we need to call a tech?
Thank you
source https://hvac-talk.com/vbb/showthread.php?2225961-Geothermal-water-water-heat-pump-cycle-time&goto=newpost
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