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It apears that I did not explain my question properly. Let me clear it up.
With manual dampers, you can adjust the percentage of fresh air (outdoor Air) from zero and up., normaly 15% ( code...

My question is about fresh air not economizer.

Mixed air setting could be the problem. Check and reset above 500F

Hello all,
any one can explaine the porpuse of motorized fresh air damper on roof tops since it is a code's requirement instead of manual fresh air damper.


Thanks

Recently I replaced many indoor coil which came with R410a TXV manf. installed. Keeping the condensing R22 unit, we must change the TXV compatible with R22.
My question is what happens to the...

I need some advise on how to hookup a UV light to a furnace/air-handler in a way on which when the unit is not running deenrgize the light (summer or winter).
Please be specific and with no or...

Does anyone know how they measure the tempreture when dry-bulb is 93F but feels like 105F. How we can measure our feeling? I undestand the windshield Temp, but does it apply to summer too? How?

"minusdegrees
NO Drop in pressure...vacuumed ..wieghed in charge..... suction pressure 55.... head 290 psi......added refrigerant to try and get suction pressure to rise ....no good ... head raised...

You should consulte with Carrier about your application before installing these units. Now, you can control latent heat by making a bypass duct from supply air to return air (recirculating air and...

Compare your readings with performance data. It should be in a plastic envelope attached to the unit.
Just as a reminder, performance data sheet is not a charging guide, you can only compare your...

It SEEMS to me the changeover valve is leaking.

Thanks Chris,
I orded two books on that site.

Low highside presure is due to very low evaporator temperature. I Agree that there is an air flow problem. Check the blower fan rotation. I had a not very similar case which was fixed by switching L1...

?

I need a book on erection of metal ducts. Any recomendation is appreciated.

Dryer is restrcted. They should change it at first place. Before installing new dryer remove old one, purge evaporator coil with high presure nitrogen <200psig from suction side out through liquid...

Another simple life.
Be aware of electricity and fan blades.