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036-21508-005-A-0305
24 Unitary Products Group
TABLE 12: STATIC RESISTANCES
TABLE 13: ELECTRIC HEATER CFM LIMITATIONS
1000 1200 1400 1600 1800 2000 2200 2400 2600
0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20 0.23
5-15KW 0.04 0.05 0.06 0.07 0.08 0.10 0.12 0.14 0.16
20-30KW 0.06 0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20
0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.14 0.16
BOTTOM DUCT CONNECTIONS
1
ELECTRIC
HEATERS
1
RESISTANCE, IWG
CFM
DESCRIPTION
ECONOMIZER
1, 2
1. Deduct these resistance values from the available external static pressure shown in SUPPLY AIR BLOWER PERFORMANCE Tables.
2. 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.
5 7 10 15 20 30
208/230-1-60 1100 1100 1200 1200 1300 -
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 -
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
208/230-3-60 1600 1600 1600 1600 1600 1600
460-3-60 - 1600 1600 1600 1600 1600
575-3-60 - - 1600 1600 1600 1800
3
4
5
MINIMUM SUPPLY AIR CFM
HEATER SIZE NOMINAL KW
VOLTAGE
UNIT MODEL SIZE NOMINAL
TONS