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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.