Blower Motor And Drive Data; Static Resistances; Power Exhaust Performance - York BQ240 Technical Manual

TABLE 7: BLOWER MOTOR AND DRIVE DATA
Blower
Range
(RPM)
MODEL Drive
HP
Standard 870/1025
High
BQ240
Speed 950/1120
Access
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
WET 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 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
0.2
SPEED
CFM KW
1
5250 0.83
HIGH
MEDIUM 4900 0.77
LOW 4400 0.72
1. Factory Setting
Power Exhaust motor is a 3/4 HP, PSC type with sleeve bearings, a 48 frame and inher-
ent protection.
20
1
Motor
EFF. Outside
Frame Designation
% Diameter
7.5 213T 89 1VP68
1
EXTERNAL STATIC PRESSURE DROP
DESCRIPTION
2
STATIC RESISTANCE OF RETURN DUCTWORK, IWG
0.3 0.4
CFM KW CFM KW
4500 0.85 4200 0.88
3900 0.79 3500 0.82
3700 0.74 3000 0.78
Adjustable Motor Pulley
Pitch
Bore Outside
Dia.
(In.) Diameter
(In.)
BK120
5.5
6.75 1-3/8
6.5
BK110
6000
18 KW
36 KW
54 KW
72 KW
0.5 0.6
CFM KW CFM KW
3750 0.93 3000 0.99
2900 0.85 - -
- - - -
036-21489-001-C-1004
Fixed Blower Pulley
Pitch
Bore Outside
Dia.
(In.) Diameter
(In.)
11.75 11.4 1-3/16 BX83
10.75 10.4 1-3/16 BX80
RESISTANCE, IWG
CFM
BQ240
8000
0.1 0.1
0.1 0.1
0.1 0.2
0.2 0.3
0.2 0.4
0.1 0.1
0.2 0.3
Unitary Products Group
Belt
(Notched)
Pitch
Dia. Qty.
(In.)
84.8 1
81.8 1
9400
0.1
0.1
0.3
0.4
0.6
0.1
0.5