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Old 06-22-2010, 10:39 PM   #1
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Refrigerant pressures


Just had our first annual maintenance on our new HVAC systems.

Equipment (upstairs)
Rheem RASL-024-JEZ condenser, RCFN-2417 coil, RGJD-06EMCK furnace.
Pressures 140/250 at 95 degrees/90% humidity (outside), 76 degrees inside 20 degree delta. R-410 refrigerant.

Equipment (downstairs)
Rheem RASL-036-JEZ condenser, RCQD-3621 coil, RGJD-07EMCK furnace.
Pressures 130/295 at 95 degrees/90% humidity (outside), 76 degrees inside 20 degree delta. R-410 refrigerant.

The tech proclaimed them "normal". Is it possible to confirm if these numbers look good?

Thanks

Keith

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Old 06-22-2010, 11:10 PM   #2
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Refrigerant pressures


They look a little low on the high side but other factors could be in play. I wouldn't worry about it. Did the tech measure superheat/subcooling?

Delta T looks OK as long as you have good airflow.

Have you noticed any change in the system's performance?
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Last edited by hennyh; 06-22-2010 at 11:33 PM.
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Old 06-23-2010, 06:44 AM   #3
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Refrigerant pressures


Your second floor high side reading can't be right(or you got a problem).

R410A at 250PSIG is a saturated temp of 83.6. That would be under the 95 outdoor temp you posted. If it is right, then there is a restriction before the point where he took the temp reading.

Other unit's sat temp is just above outdoor temp. Doubt its a correct reading either.

His gauge may be having troubles.

As above. Without SC and SH readings. Those readings don't tell us much.
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Old 06-23-2010, 07:07 AM   #4
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Refrigerant pressures


Yes, I thought the high side pressures looked a little low for R410a (which is why I posted them here). The systems are working fine - no problems, no changes. He didn't measure (or at least he didn't report) SC and SH.

Keith
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