Measuring TESP

pirateo · 08-05-2009, 12:55 PM

Hi everyone. I was wondering how you go about measuring TESP if the evap coil is right on top of the AH. I know you measure directly after the filter (blower compartment) and between the AH and evap coil, but in several cases, it is difficult to find a good place to measure between AH and evap coil..

Any tips you have would be helpful.

Thanks.

**beenthere** · 08-05-2009, 04:14 PM

Drill hole in the furnace jacket.
Or, remove limit, and measure there.

pirateo · 08-06-2009, 11:16 AM

Quote:

Originally Posted by beenthere

Drill hole in the furnace jacket.
Or, remove limit, and measure there.

Thanks beenthere.

Do you typically also drill a hole in the blower compartment door for the negative pressure, or do you remove a side plug and test there?

**beenthere** · 08-06-2009, 12:02 PM

Side plug if there is one. Or through a rubber wiring harness.
Drill if not.

pirateo · 08-06-2009, 12:13 PM

Quote:

Originally Posted by beenthere

Side plug if there is one. Or through a rubber wiring harness.
Drill if not.

Thanks for your help.

pirateo · 08-10-2009, 06:37 PM

Quote:

Originally Posted by beenthere

Drill hole in the furnace jacket.
Or, remove limit, and measure there.

Just wondering, when I remove the limit and use that hole to test, can I just let the limit hang down or should I remove the two wires from it first before I turn the power back on?

Don't want to shock myself.

**beenthere** · 08-10-2009, 07:13 PM

It can hang, as long as you keep it from shorting against anything.

pirateo · 08-11-2009, 12:43 PM

Quote:

Originally Posted by beenthere

It can hang, as long as you keep it from shorting against anything.

Thanks for all of your help.