I'm concerned the Safe-T-Switch SS2 (original version) on my interior unit was wired incorrectly. The drain line recently clogged, and the switch shut it off...more or less. Nest showed error E74 - no power to Rh wire.
However, the interior unit was "humming" (sounded like a motor that was energized but unable to turn), and the copper refrigerant tube was very hot. Is this normal when the overflow switch turns it off?
The SS2 is connected to the R wire. Should it be connected to Y1 (compressor) or another wire instead? The installation manual for my unit doesn't specify, but the one for a similar but newer model specifies that it should shut off the compressor.
I opened the cabinet, vacuumed the collected water, and cleaned the drain lines and the SS2. Everything then operated normally. I can recreate the humming by manually sliding the float to simulate water in the line. I did not check if the exterior unit continued to run, but I could easily test it.
The HVAC system is original to my house (16 years old). It's obviously been repaired at least once prior to me buying the house 11 years ago. The original transformer has been bypassed to another transformer with cut wires and splices everywhere. I wouldn't be surprised if a "tech" screwed something up based on other messes I've uncovered.
Equipment list:
Thanks in advance.
However, the interior unit was "humming" (sounded like a motor that was energized but unable to turn), and the copper refrigerant tube was very hot. Is this normal when the overflow switch turns it off?
The SS2 is connected to the R wire. Should it be connected to Y1 (compressor) or another wire instead? The installation manual for my unit doesn't specify, but the one for a similar but newer model specifies that it should shut off the compressor.
I opened the cabinet, vacuumed the collected water, and cleaned the drain lines and the SS2. Everything then operated normally. I can recreate the humming by manually sliding the float to simulate water in the line. I did not check if the exterior unit continued to run, but I could easily test it.
The HVAC system is original to my house (16 years old). It's obviously been repaired at least once prior to me buying the house 11 years ago. The original transformer has been bypassed to another transformer with cut wires and splices everywhere. I wouldn't be surprised if a "tech" screwed something up based on other messes I've uncovered.
Equipment list:
- Interior - Lennox CB28UH-018/024-230-01
- Exterior - Lennox 12HPB24-10P
- Tstat - Nest 3rd gen
Thanks in advance.
source https://hvac-talk.com/vbb/threads/2242559-Lennox-Heat-Pump-Overflow-Switch-Wiring-Confirmation?goto=newpost
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