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.
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