036-21502-003-A-1105

TABLE 15: STATIC RESISTANCES

 

 

 

 

 

 

RESISTANCE, IWG

 

 

 

 

DESCRIPTION

 

 

 

 

 

CFM

 

 

 

 

 

 

 

1000

1200

1400

1600

1800

2000

2200

2400

2600

2800

3000

ECONOMIZER1 3

0.07

0.08

0.09

0.11

0.13

0.15

0.17

0.20

0.23

0.26

0.30

ELECTRIC

7-15KW

0.04

0.05

0.06

0.07

0.08

0.10

0.12

0.14

0.16

0.19

0.22

HEATERS1

 

 

 

 

 

 

 

 

 

 

 

 

20-30KW

0.06

0.07

0.08

0.09

0.11

0.13

0.15

0.17

0.20

0.23

0.26

BOTTOM DUCT CONNECTIONS1

0.06

0.07

0.08

0.09

0.10

0.11

0.12

0.14

0.16

0.19

0.22

COOLING ONLY2

0.08

0.10

0.12

0.14

0.16

0.18

0.20

0.23

0.26

0.29

0.32

1.Deduct these resistance values from the available external static pressure shown in SUPPLY AIR BLOWER PERFORMANCE Tables.

2.Add these resistance values to the available static resistance values on SUPPLY AIR BLOWER PERFORMANCE Tables.

3.The pressure through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct system is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.

TABLE 16: ELECTRIC HEATER CFM LIMITATIONS

 

 

 

 

MINIMUM SUPPLY AIR CFM

 

 

UNITMODEL SIZE NOMINAL

 

 

 

 

 

 

 

 

 

VOLTAGE

 

 

HEATER SIZE NOMINAL KW

 

 

TONS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

7

 

10

15

 

20

30

 

 

 

 

 

 

 

 

 

 

 

208/230-1-60

1100

1100

 

1200

1200

 

1300

-

 

 

 

 

 

 

 

 

 

 

3

208/230-3-60

1100

1100

 

1200

1200

 

1300

-

 

 

 

 

 

 

 

 

 

460-3-60

-

1100

 

1200

1200

 

1300

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

575-3-60

-

-

 

1200

1200

 

1300

-

 

 

 

 

 

 

 

 

 

 

 

208/230-1-60

1300

1300

 

1300

1300

 

1300

-

 

 

 

 

 

 

 

 

 

 

4

208/230-3-60

1300

1300

 

1300

1300

 

1300

-

 

 

 

 

 

 

 

 

 

460-3-60

-

1300

 

1300

1300

 

1300

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

575-3-60

-

-

 

1300

1300

 

1400

-

 

 

 

 

 

 

 

 

 

 

 

208/230-1-60

1600

1600

 

1600

1600

 

1600

1600

 

 

 

 

 

 

 

 

 

 

5

208/230-3-60

1600

1600

 

1600

1600

 

1600

1600

 

 

 

 

 

 

 

 

 

460-3-60

-

1600

 

1600

1600

 

1600

1600

 

 

 

 

 

 

 

 

 

 

 

 

 

 

575-3-60

-

1600

 

1600

1600

 

1600

1800

 

 

 

 

 

 

 

 

 

 

 

208/230-3-60

1800

1800

 

1800

1800

 

1800

1800

 

 

 

 

 

 

 

 

 

 

6

460-3-60

-

1800

 

1800

1800

 

1800

1800

 

 

 

 

 

 

 

 

 

 

 

575-3-60

-

-

 

1800

1800

 

1800

1800

 

 

 

 

 

 

 

 

 

 

Unitary Products Group

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York DM 072 warranty Static Resistances, Electric Heater CFM Limitations, Minimum Supply AIR CFM

DM 072 specifications

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