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254597-YTG-B-0507
14 Unitary Products Group
TABLE 12: 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.
3 TON 790/1120 1 1/2 56 1VL40 2.7-3.7 2.4-3.4 5/8 AK61 5.9 5.7 1 A36 37.3 1
4 TON 790/1120 1 1/2 56 1VL40 2.7-3.7 2.4-3.4 5/8 AK61 5.9 5.7 1 A36 37.3 1
5 TON 850/1220 1 1/2 56 1VL40 2.7-3.7 2.4-3.4 5/8 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 13: STATIC RESISTANCES
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.
TABLE 14: ELECTRIC HEATER CFM LIMITATIONS
UNITMODEL SIZE NOMINAL
TONS
VOLTAGE
MINIMUM SUPPLY AIR CFM
HEATER SIZE NOMINAL KW
5 7 10 15 20 30
3
208/230-3-60 1100 1100 1200 1200 1300 -
460-3-60 - 1100 1200 1200 1300 -
575-3-60 - - 1200 1200 1300 -
4
208/230-3-60 1300 1300 1300 1300 1300 -
460-3-60 - 1300 1300 1300 1300 -
575-3-60 - - 1300 1300 1400 -
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 1800