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Champaign, Illinois
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Gaston, Oregon
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Sagamore Hills, Ohio
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Lafayette, Louisiana
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 Heat Pump Question(s)
[#4] Posted: 02/28/2010 - 5:29:15 PM |  |  |
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You bet it can be damaging. It's takes heat to evaporate liquid refrigerant to a gas and if the coils are clogged, with ice or whatever, it may remain as liquid, all the way to the compressor suction. Pumps move liquids, compressors move gases. Inject liquid into a compressor like a residential refrigerant hermetic unit and you'll blow the valves for sure.
Marc
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"If Guam gets too overpopulated, it might tip over."
Congressman Hank Johnson (D) GA |
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Gaston, Oregon
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Lafayette, Louisiana
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Heat Pump Question(s)
[#6] Posted: 03/01/2010 - 04:09:32 AM | | |
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The scroll is more tolerant to contaminants than reciprocating units with reed valves, but they can be damaged too and can fail if too much liquid refrigerant and oil enters the suction, don't you think Jim?
Marc
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"If Guam gets too overpopulated, it might tip over."
Congressman Hank Johnson (D) GA |
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Rochester, New York
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Lafayette, Louisiana
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Heat Pump Question(s)
[#8] Posted: 03/01/2010 - 05:07:01 AM | | |
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Gases.
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"If Guam gets too overpopulated, it might tip over."
Congressman Hank Johnson (D) GA |
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Gaston, Oregon
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Lafayette, Louisiana
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Heat Pump Question(s)
[#10] Posted: 03/01/2010 - 09:17:42 AM | | |
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Up until about 5 years ago when I last worked full time in HVAC, yes. Practically all of them. When they are tripped, it's usually been because someone flipped the thermostat from heat to cool or vice versa too quickly, spiking the head pressure long enough to trigger it. Don't see reciprocating compressors in residential/ light commercial HVAC units anymore, except for perhaps Trane. Commercial coolers/freezers still use them (last I heard).
Marc
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"If Guam gets too overpopulated, it might tip over."
Congressman Hank Johnson (D) GA |
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Gaston, Oregon
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Heat Pump Question(s)
[#11] Posted: 03/01/2010 - 11:50:39 AM | | |
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| Quote: Originally posted by Marc
Up until about 5 years ago when I last worked full time in HVAC, yes. Practically all of them. When they are tripped, it's usually been because someone flipped the thermostat from heat to cool or vice versa too quickly, spiking the head pressure long enough to trigger it.
It used to be a real problem with the old mercury bulb stats because the mercury would bounce back & forth causing the compressor to start/stop/start. I don't see that much with the newer electronic stats.
Quote: Don't see reciprocating compressors in residential/ light commercial HVAC units anymore, except for perhaps Trane. Commercial coolers/freezers still use them (last I heard).
Trane held out for a long time, but all of the new Tranes that I see have scrolls. Now they bray about it as if they invented them.
- Jim Katen, Oregon
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Jim Katen, Oregon
www.amipdx.com |
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Allen, Texas
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Heat Pump Question(s)
[#12] Posted: 03/01/2010 - 2:09:16 PM | | |
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Quote: Originally posted by fqp25Is this normal? 32 degree outside temp. New construction vacant for 2 years, t-stat set to 63 degrees. Click to View
 44.22 KBClick to View
 58.96 KBWhen I got inside I turned the t-stat up to 65, and the Aux light turned on and the heat pump turned off. Frank
Just a fine point, in the normal heat mode, the normal operation sequence would leave both the heat pump and strip heaters engaged unless there is a outdoor stat to shut the HP down or the indoor thermostat mode switch is moved to the "emergency" heat setting.
IMO you may have a unit that is not wired correctly or has a malfunction in the control circuit.
Around here, we may only have a 5K heater as supplemental heat and the unit may never catchup if the HP is shut down when the temperature falls below the set point.
No doubt that frost load on the coil is a tad bit on the heavy side so the defrost cycle needs attention.
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Jim Luttrall
Mr. Inspector.net, Inc.
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