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036-21630-001-B-0904
Unitary Products Group 19
TABLE 6: BELT DRIVE BLOWER MOTOR AND DRIVE DATA
MODEL
SIZE
BLOWER
RANGE
(RPM)
MOTOR
1
ADJUSTABLE MOTOR PULLEY FIXED BLOWER PULLEY
BELT
(NOTCHED)
HP FRAME
DESIG-
NATION
OUTSIDE
DIA.
(IN.)
PITCH
DIA.
(IN.)
BORE
(IN.)
DESIG-
NATION
OUTSIDE
DIA.
(IN.)
PITCH
DIA.
(IN.)
BORE
(IN.)
DESIG-
NATION
PITCH
LENGTH
(IN.)
QTY.
6 TON 900/1250 1 1/2 56 1VL44 3.1-4.1 2.8-3.8 7/8 AK56 5.4 5.2 1 A36 37.3 1
1. All motors have solid bases and are inherently protected. these motors can be selected to operate into their service factor because they are located
in the moving air, upstream of any heating device.
TABLE 7: STATIC RESISTANCES
TABLE 8: ELECTRIC HEATER CFM LIMITATIONS
1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000
0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20 0.23 0.26 0.30
7-15KW 0.04 0.05 0.06 0.07 0.08 0.10 0.12 0.14 0.16 0.19 0.22
20-30KW 0.06 0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20 0.23 0.26
0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.14 0.16 0.19 0.22
0.08 0.10 0.12 0.14 0.16 0.18 0.20 0.23 0.26 0.29 0.32
COOLING ONLY
2
RESISTANCE, IWG
CFM
DESCRIPTION
ECONOMIZER
1 3
BOTTOM DUCT CONNECTIONS
1
ELECTRIC
HEATERS
1
1. Deduct these resistance values from the available external static pressure shown in 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.
2. Add these resistance values to the available static resistance values on SUPPLY AIR BLOWER PERFORMANCE Tables.
5 7 10 15 20 30
208/230-1-60 1800 1800 1800 1800 1800 1800
208/230-3-60 1800 1800 1800 1800 1800 1800
460-3-60 - 1800 1800 1800 1800 1800
575-3-60 - - 1800 1800 1800 1800
6
MINIMUM SUPPLY AIR CFM
HEATER SIZE NOMINAL KW
VOLTAGE
UNIT MODEL SIZE NOMINAL
TONS