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22-01-2015, 01:28 AM #1
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Hey, I am new to : RE
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rudd heat pump onstallation trouble?
so we replaced our rheem 5 ton heat pump. its only 45 out so we tried to trick it by using a blanket. couldn't get high side above 100 but the low side wouldn't come off zero. so we tried in heat just to see what we had. strange thing at service port we were at 45 true suction, but 225 on both high and low side and line large line was hotter than it should be. it does have a txv valve and not sure if this is whats making it so difficult or if I have something else going on. any help or ideas would be great and ty in advance
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22-01-2015, 11:36 AM #2
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I am starting to push the Mods: of RE
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Re: rudd heat pump onstallation trouble?
Welcome to the forum robershaw,
Don't know about Rudd, not something we normally come across on this side of the pond.
However, most modern systems have the expansion device in the outdoor unit.
This means that in cooling mode the smaller interconnecting pipe is an expansion line whilst the larger is suction. In Heat mode the larger pipe will be discharge and the smaller your liquid line, explaining why they both got the same pressure.
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22-01-2015, 05:56 PM #3
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Re: rudd heat pump onstallation trouble?
Viking, Think these will have an expansion device in the indoor and outdoor units, with some sort of check valve so they don't let by in the when not needed.
Originally Posted by The Viking
Welcome to the forum robershaw,
Don't know about Rudd, not something we normally come across on this side of the pond.
However, most modern systems have the expansion device in the outdoor unit.
This means that in cooling mode the smaller interconnecting pipe is an expansion line whilst the larger is suction. In Heat mode the larger pipe will be discharge and the smaller your liquid line, explaining why they both got the same pressure.
Robershaw, the 'suction line' and liquid line will have similar pressures in heating mode as the suction line performs as the discharge line in heating mode due to the indoor coil now being used as a condenser.
It sounds like your cooling TXV may be faulty, there have been issues with Copeland scroll compressor equipped systems fouling their TXV's due to a chemical reaction to a new rust proofing additive Copeland started using. There is some special treatment now to add to the system to try and prevent this though it may be too late in your case.
Is this a diy install?Mostly found in Oxfordshire, UK :)
