TABLE 8 - STATIC RESISTANCES*
TABLE 9 - POWER EXHAUST PERFORMANCE
TABLE 10 - 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
OUT-
SIDE
DIA.
(IN.)
PITCH
DIA.
(IN.)
BORE
(IN.)
DESIG-
NATION
OUTSIDE
DIA.
(IN.)
PITCH
DIA.
(IN.)
BORE
(IN.)
DESIG-
NATION
PITCH
LENGTH
(IN.)
QTY.
25 TON
Stan-
dard
1009/1245
15 254T 89 2MVP60 7.68
6.0-
7.4
2
P2
BUSH-
ING
2BK110H 10.75 10.4 1-7/16 BX83 84.8 2
High
Speed
Access
1117/1377 2BK100H 9.75 9.4 1-7/16 BX80 81.8 2
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.
MOTOR
SPEED
STATIC RESISTANCE OF RETURN DUCTWORK, IWG
0.2 0.3 0.4 0.5 0.6
CFMKWCFMKWCFMKWCFMKWCFMKW
HIGH* 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 ----
*
Factory Setting
Power Exhaust motor is a 3/4 HP, PSC type with sleeve bearings, a 48 frame and inherent protection.
EXTERNAL STATIC PRESSURE DROP
DESCRIPTION
RESISTANCE, IWG
CFM
9,000 10,000 11,000
WET COIL 0.1 0.1 0.1
GAS HEAT 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
INLET GUIDE VANCES 0.3 0.4 0.5
HORIZONTAL DUCT CONNECTIONS 0.2 0.3 0.5
*
Deduct these resistance values from the available unit ESP values listed in the respective blower performance table except for Horizontal Duct Connections
(Shaded ).
Add these values due to less airflow resistance.
530.18-N11Y
14 Unitary Products Group
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