036-21489-001-C-1004
20
Unitary Products Group
TABLE 7: BLOWER MOTOR AND DRIVE DATA
MODEL
Drive
Blower
Range
(RPM)
Motor
1
Adjustable Motor Pulley
Fixed Blower Pulley
Belt
(Notched)
HP
Frame
EFF.
%
Designation
Outside
Diameter
Pitch
Dia.
(In.)
Bore
(In.)
Outside
Diameter
Pitch
Dia.
(In.)
Bore
(In.)
Outside
Diameter
Pitch
Dia.
(In.)
Qty.
BQ240
Standard
870/1025
7.5
213T
89
1VP68
6.75
5.5
6.5
1-3/8
BK120
11.75
11.4
1-3/16
BX83
84.8
1
High
Speed
Access
950/1120
BK110
10.75
10.4
1-3/16
BX80
81.8
1
1. All motors have a nominal speed of 1800 RPM, at 1.5 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.
TABLE 8: STATIC RESISTANCES
1
EXTERNAL STATIC PRESSURE DROP
DESCRIPTION
RESISTANCE, IWG
CFM
BQ240
6000
8000
9400
WET COIL
0.1
0.1
0.1
ELECTRIC HEAT OPTIONS
18 KW
0.1
0.1
0.1
36 KW
0.1
0.2
0.3
54 KW
0.2
0.3
0.4
72 KW
0.2
0.4
0.6
ECONOMIZER OPTION
0.1
0.1
0.1
HORIZONTAL DUCT CONNECTIONS
2
0.2
0.3
0.5
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 airflow will be less for horizontal duct connections than for bottom duct connections, add these pressures to the ESP values
listed in the respective units’ blower performance table.
TABLE 9: POWER EXHAUST PERFORMANCE
MOTOR
SPEED
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
1
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. Factory Setting
Power Exhaust motor is a 3/4 HP, PSC type with sleeve bearings, a 48 frame and inher-
ent protection.
