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08-03-2012, 08:45 PM #1Regular Guest
- Join Date
- Mar 2010
- Downriver, Michigan
What do you think of these numbers?
Here in Michigan it's 87 degrees outside and the discharge tempature is 52.3 degrees.
08-03-2012, 09:03 PM #2
Indoor supply air temps alone don't tell us what other things we need to know in order to tell how the system is performing.
What data is needed:
Performance Data Collection – Best Time to collect data is late afternoon around 4:30 pm, when attic is HOT; also when outdoor temps are around 85; 95; 105F or, anywhere in between.
*All U need is a good thermometer (digital reading in tenths preferable) & and indoor Humidity Gauge
1) Helpful; Tonnage & SEER of Unit & outdoor condenser model number: ___________
2) TXV or, orifice metering device? _______. Only if U know…
3) Outdoor condenser’s discharge-air-temperature ______-F
Subtract Outdoor air temperature: _______
Outdoor Condenser Air-Temp-Split _______
4) Need the ‘Indoor’ percent of relative humidity - in the middle of the rooms or, at Return-Air inlet grilles ___
5) Indoor Return-Air Temperature ______
Subtract Indoor Supply-Air Temperature ______ -F
Indoor temperature-split _______-F
We need the above information, plus "a Tech's" Pressure readings & Superheat & Subcooling temps, for troubleshooting & performance analysis.
A Goodman 2-Ton 13-SEER condenser, 800-cfm indoor airflow; 80-F indoor dry bulb & 50% relative humidity; Indoor temp-split 18 to 19-F.
@ 85-F outdoors; 103.9-F - 85-F outdoors or around an 18.9-F temp-split;
@ Indoor 75-F & 50% RH condenser temp-split is only around 14.9-F.
08-03-2012, 09:39 PM #3
52.3 degrees might be great, might not.
Post all the readings you have."Hey Lama, hey, how about a little something, you know, for the effort." And he says, "there won't be any money, but when you die, on your deathbed, you will receive total consciousness." So I got that goin' for me, which is nice. - Carl Spackler
08-04-2012, 03:42 PM #4
ill be even more impressed if you tell me your return air temp is 72.3 degrees.FILL OUT YOUR PROFILE!!