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262292-YTG-B-0107
38 Unitary Products Group
TABLE 23: BLOWER MOTOR AND DRIVE DATA
MODEL
SIZE
DRIVE
BLOWER
RANGE
(RPM)
MOTOR
1
ADJUSTABLE MOTOR PULLEY FIXED BLOWER PULLEY
BELT
(NOTCHED)
HP FRAME
EFF.
(%)
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.
15 TON
Standard 790/970 5 184 T 89.5
1VP62 5.95
4.9-5.9
2
1-1/8 BK105 10.25 9.9
1 BX81 82.8 1
High
Speed
Access
940/1130 7.5 213 T 91 1-3/8 BK90 8.75 8.4
20 TON
Low
Speed
Drive
910/1100
7.5 213 T 91
1VP68 6.55 5.5-6.5 1-3/8
BK100 9.75 9.4 1-3/16 BX81 82.8 1Standard 10 215 T 91
High
Speed
Access
1000/1180 15 254 T 91 1VP71 7.1 5.4-6.6 1-5/8
25 TON
Low
Speed
Drive
900/1100
7.5 213 T 91
1VP65 6.0 4.8-6.0
1-3/8
1B5V94 9.7 9.5
1-3/16
BX78 79.8
1Standard
15 254 T 91 1-5/8 1-7/16
High
Speed
Access
1000/1200 1VP71 7.1 5.5-6.5 BX81 82.8
1. All motors have a nominal speed of 1800 RPM, a 1.15 service factor and a solid base. They can operate to the limit of their service factor because they are
located in the moving air, upstream of any heating device.
2. Do NOT
close this pully below 1 turn open.
TABLE 24: STATIC RESISTANCES
1
DESCRIPTION
RESISTANCE, IWG
CFM
15 TON 20 TON 25 TON
4500 6000 7500 6000 8000 9000 7500 8000 9000
WET INDOOR COIL 0.1 0.1 0.1 0.1 0.1 0.2 0.1 0.1 0.2
ELECTRIC HEAT OPTIONS
18 KW 0.3 0.4 0.4 0.4 0.4 0.5 0.4 0.4 0.5
36 KW 0.3 0.4 0.5 0.4 0.5 0.5 0.5 0.5 0.5
54 KW 0.4 0.5 0.5 0.5 0.5 0.6 0.5 0.5 0.6
72 KW 0.4 0.5 0.5 0.5 0.5 0.6 0.5 0.5 0.6
ECONOMIZER OPTION 0.1 0.1 0.1 0.1 0.1 0.2 0.1 0.1 0.2
HORIZONTAL DUCT CONNECTIONS
2
0.1 0.2 0.3 0.2 0.3 0.5 0.3 0.3 0.5
1. Deduct these resistance values from the available external static pressures shown in the respective Blower Performance Table.
2.
Since the resistance to air flow will be less for horizontal duct connections than for bottom duct connections, add these pressures to the
ESP values on the respective unit’s blower performance table.
TABLE 25: POWER EXHAUST PERFORMANCE
MOTOR
SPEED
1
STATIC RESISTANCE OF RETURN DUCTWORK, IWG
0.2 0.3 0.4 0.5 0.6
CFM kW CFM kW CFM kW CFM kW CFM kW
HIGH
2
5250 0.83 4500 0.85 4200 0.88 3750 0.93 3000 0.99
MEDIUM
4900 0.77 3900 0.79 3500 0.82 2900 0.85 - -
LOW
4400 0.72 3700 0.74 3000 0.78 - - - -
1. Power exhaust motor is a 3/4 HP, PSC type with sleeve bearings, a 48 frame and inherent protection.
2. The factory setting.