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TABLE 31: BLOWER MOTOR AND DRIVE DATA
BLOWER
MODEL
DRIVE
RANGE
SIZE
(RPM)
HP FRAME
Standard 850/1065
High
15 TON
5
Speed
965/1190
Access
Standard 870/1025
17.5 &
High
7.5
20 TON
Speed
950/1120
Access
Standard 975/1165
High
25 TON
15
Speed
1140/1365
Access
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 32: STATIC RESISTANCES
DESCRIPTION
WET INDOOR COIL
ELECTRIC HEAT OPTIONS
ECONOMIZER OPTION
HORIZONTAL DUCT CONNECTIONS
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 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 33: POWER EXHAUST PERFORMANCE
MOTOR
1
SPEED
CFM
2
5250
HIGH
MEDIUM
4900
LOW
4400
1. Power exhaust motor is a 3/4 HP, PSC type with sleeve bearings, a 48 frame and inherent protection.
2. The factory setting.
40
1
ADJUSTABLE MOTOR PULLEY
MOTOR
OUTSIDE
EFF.
DESIG-
DIA.
(%)
NATION
(IN.)
184 T
83
1VP56
5.35
213 T
89
1VP68
6.75
254 T
91
1VP75X
1
15 TON
4500
6000
7200
0.1
0.1
18 KW
0.1
0.1
36 KW
0.1
0.2
54 KW
0.2
0.3
72 KW
0.2
0.4
0.1
0.1
2
0.1
0.2
STATIC RESISTANCE OF RETURN DUCTWORK, IWG
0.2
0.3
kW
CFM
0.83
4500
0.77
3900
0.72
3700
FIXED BLOWER PULLEY
PITCH
BORE
DESIG-
DIA.
(IN.)
NATION
(IN.)
BK90
2
1-1/8
4.3-5.3
BK80
BK120
2
1-3/8
5.5-6.5
BK110
1B5V110
2
7.5
1-5/8
6.2-7.4
1B5V94
RESISTANCE, IWG
CFM
17.5 TON
6000
7500
9000
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.3
0.1
0.2
0.3
0.4
0.2
0.3
0.4
0.6
0.2
0.4
0.6
0.1
0.1
0.1
0.1
0.3
0.2
0.3
0.5
0.4
kW
CFM
kW
0.85
4200
0.88
0.79
3500
0.82
0.74
3000
0.78
036-21410-001-A-0502
OUTSIDE
PITCH
BORE
DESIG-
DIA.
DIA.
(IN.)
NATION
(IN.)
(IN.)
8.75
8.4
1
BX81
7.75
7.4
1
BX78
11.75
11.4
1-3/16
BX83
10.75
10.4
1-3/16
BX81
11.3
11.1
1-7/16 5VX860
9.7
9.5
1-7/16 5VX840
20 TON
6000
8000
9400
7500
0.1
0.1
0.1
0.11
0.1
0.1
0.1
0.31
0.1
0.2
0.3
0.38
0.2
0.3
0.4
0.62
0.2
0.4
0.6
0.68
0.1
0.1
0.1
0.06
0.2
0.3
0.5
0.36
0.5
CFM
kW
CFM
3750
0.93
3000
2900
0.85
-
-
Unitary Products Group
BELT
(NOTCHED)
PITCH
LENGTH
QTY.
(IN.)
82.8
1
79.8
1
84.8
1
82.8
1
86.0
1
84.0
1
25 TON
10000 12500
0.11
0.11
0.56
0.87
0.68
1.07
1.10
1.72
1.21
1.90
0.11
0.18
0.32
0.46
0.6
kW
0.99
-
-
-
-
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