Original message
| I dont know
 |  "high suction, high head, bad compressor???"
, posted Fri 11 Jul 16:30  
Copeland, CR18KQTF5980WB compressor, R-22. Running walk-in cooler. Pressures, 58 and 310. Suction temperature at expansion valve bulb is 58 degrees, liquid line at coil 74 degrees. Box temperature 54 degrees. Air from condenser unusually cool. Sight glass, some bubbles. No weight for refrigerant charge given on manufacturer tag. Tried to pump unit down by front seating reciever service valve. Head pressure rose steadily to 400psi and tripped head pressure control. Removed some refrigerant until head pressure and suction pressure steadily dropped during pumpdown, then compressor would only pump to 15 psi after 10 minutes.
Question. If valves are bad wouldn't I see high suction pressure and low head pressure, not high suction and high head pressure?
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Replies:
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| bigglenn357
| "Re(1):high suction, high head, bad compressor" , posted Sun 13 Jul 08:09
Uve seen high suction and head from bad valves the high side pressure can bleed over to low side causing these symptons
Big Glenn
"Imagination is more important than knowledge" (Albert Einstien)
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| theduke03
| "Re(1):high suction, high head, bad compressor" , posted Fri 11 Jul 19:05:
You've reported that the liquid line was 74 degrees? That suggests that the condenser entering air must be at or below 74 degrees. If this is the case then the 310 head pressure is way too high. Your subcooling is about 60 degrees, also too high. At this subcooling the sight glass should have no bubbles. I think your numbers are screwy so I would suggest thoroughly cleaning the condenser then recheck those pressures and temps.
The thing is that the suction is high because the head is high.
The system is overcharged.
"My dad was the most feared furnace fighter in Northern Indiana."
[this message was edited by theduke03 on Sun 13 Jul 01:36] |
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