York D1NA018, D2NA060 D1NA036, 1600, AirflowCFM, DeltameaPvsD1NA042urementsAirflow

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.

035-18265-001-A-0202

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

f

tity can esult in extensive system damage.

9

coil.

0.8

the indoor

After

readings have

been obtained, remove the tubes and rein-

3.Using

an inclined

manometer,

determine

the pressure dr

p

stall the

two ¼ inch

plugs removed in Step 1.

across the dry evaporator coil.

Since the

moisture on an evapo-

D1NA036

7

pressure drop across

NOTE:

De-energize

rator coil may vary greatly, measuring the

the compressors before taking any test

a wet coil under field conditionsD1NA018would be

inaccurate. D1NA024To ensureCoil

DeltameaPvsD1NA042urementsAirflow

to

ensure a dryD1NA048indoor-60coil.

30

6

24-60

5

36

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 13