York 1-1/2 THRU 5 TON (10 SEER) D1NA036, ensureD1NA024Coil, Checking Supply Air CFM, D1NA08

035-16703-001-A-0202

Checking Supply Air CFM

To check the supply air CFM after the initial balancing has been completed:

1.Remove the two ¼ inch dot plugs in the duct panel.

a dry coil, the compressors should be deactivated while the test is being run.

4.Knowing the pressure drop across a dry coil, the actual CFM through the unit can be determined from the curve in Coil Delta P vs. Supply Air CFM figure.

2.Insert at least 8 inches of ¼ inch tubing into each of these									WARNING! Failure to properly adjust the total system air quan-
holes for sufficient penetration into the airflow on both sides of									tity can result in extensive system damage.
	9
	0.8
the indoor coil.									After readings have been obtained, remove					the tubes and rein-
3.Using an inclined manometer,				determine the pressure			drop		stall the two ¼ inch plugs removed in Step					1.
	7			the moisture on an			evapo-								D1NA036
across the dry evaporator coil. Since
rator coil may vary greatly, measuring				the pressure drop			across		NOTE: e-energize the compressors before taking any test
a wet coil under field conditionsD1NA018would be inaccurate. To							ensureD1NA024Coil		Deltame surementsPvsD1NA042Airflowto ensure a dry indoorD1NA048coil.-60									30
	6
																	3624-60
	5
CoilDeltaP	4															D1NA08			36)3
	2															Linear(D1NA018)
	3																		24-60)
	10
		600	800		1000	1200		1400		1600	1800	2000	2200
ID	400
							Airflow(CFM)

Unitary Products Group 7