261660-YTG-C-0707
Unitary Products Group
23
TABLE 16: 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 850/1065
5
184 T
83
1VP56
5.35
4.3-5.3
2
1-1/8
BK90
8.75
8.4
1
BX81
82.8
1
High
Static
965/1190
BK80
7.75
7.4
1
BX78
79.8
1
17.5 &
20 TON
Standard 870/1025
7.5
213 T
89
1VP68
6.75
5.5-6.5
2
1-3/8
BK120
11.75
11.4
1-3/16
BX83
84.8
1
High
Static
950/1120
BK110
10.75
10.4
1-3/16
BX81
82.8
1
25 TON
Standard 975/1165
15
254 T
91
1VP75X
7.5
6.2-7.4
2
1-5/8
1B5V110
11.3
11.1
1-7/16
5VX860
86.0
1
High
Static
1140/1365
1B5V94
9.7
9.5
1-7/16
5VX840
84.0
1
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 17: STATIC RESISTANCES
1
DESCRIPTION
RESISTANCE, IWG
CFM
15 TON
17.5 TON
20 TON
25 TON
4500
6000
7200
6000
7500
9000
6000
8000
9400
7500
10000
12500
WET INDOOR COIL
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
ELECTRIC HEAT OPTIONS
18 KW
0.3
0.4
0.4
0.4
0.4
0.5
0.4
0.4
0.5
0.4
0.5
0.6
36 KW
0.3
0.4
0.5
0.4
0.5
0.5
0.4
0.5
0.5
0.5
0.5
0.6
54 KW
0.4
0.5
0.5
0.5
0.5
0.6
0.5
0.5
0.6
0.5
0.6
0.7
72 KW
0.4
0.5
0.5
0.5
0.5
0.6
0.5
0.5
0.6
0.5
0.6
0.7
ECONOMIZER OPTION
0.1
0.1
0.1
0.1
0.1
0.2
0.1
0.1
0.2
0.1
0.2
0.3
HORIZONTAL DUCT CONNECTIONS
2
0.1
0.2
0.3
0.2
0.3
0.5
0.2
0.3
0.5
0.3
0.5
0.6
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 18: 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.
