036-21539-003-B-0305
46
Unitary Products Group
TABLE 29: 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
760/940
5
184 T
89.5
1VP56
5.35
4.3-5.3
2
1-1/8
BK105
10.5
9.9
1
BX81
82.8
1
High
Speed
Access
875/1150 7.5
213 T
91.7
1VP60
6.0
4.2-5.5
1-3/8
BK90
8.75
8.4
20 TON
Standard 850/1010 7.5
213 T
89
1VP68
6.75
5.5-6.5
2
1-3/8
BK110
10.75
10.4
1-3/16
BX81
82.8
1
High
Speed
Access
950/1120 10
1VP71
7.1
5.4-6.6
25 TON
Low
Speed
Drive
842/1003
7.5
254 T
89
1VP60
6.0
4.2-5.5
1-3/8
1B5V94
9.7
9.5
1-3/16
BX78
79.8
1
Standard
15
91
1-5/8
1-7/16
High
Speed
Access
1020/1221
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 pulley below 1 turn open.
TABLE 30: STATIC RESISTANCES
1
DESCRIPTION
RESISTANCE, IWG
CFM
15 TON
20 TON
25 TON
4500
5600
7500
6000
8000
9400
7500
10000
12500
WET INDOOR COIL
0.1
0.1
0.1
0.1
0.1
0.1
0.11
0.11
0.11
ELECTRIC HEAT OPTIONS
18 KW
0.3
0.35
0.39
0.35
0.4
0.45
0.40
0.45
0.55
36 KW
0.32
0.40
0.44
0.40
0.48
0.50
0.45
0.5
0.6
54 KW
0.38
0.45
0.49
0.45
0.52
0.57
0.5
0.6
0.7
72 KW
0.38
0.45
0.49
0.45
0.52
0.57
0.5
0.6
0.7
ECONOMIZER OPTION
0.1
0.1
0.1
0.1
0.1
0.1
0.06
0.11
0.18
VERTICAL DUCT CONNECTIONS
2
0.1
0.2
0.3
0.2
0.3
0.5
0.36
0.32
0.46
1. Deduct these resistance values from the available external static pressures shown in the respective Blower Performance Table (See Note 2 for
exception.)
2. Since the resistance to air flow will be more for vertical duct connections than for side duct connections, deduct these pressures from the ESP values
on the respective unit’s blower performance table.
TABLE 31: 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.