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TABLE 23: BLOWER MOTOR AND DRIVE DATA |
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| MOTOR1 |
| ADJUSTABLE MOTOR PULLEY | FIXED BLOWER PULLEY |
| BELT |
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MODEL |
| BLOWER |
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| (NOTCHED) |
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SIZE | DRIVE | RANGE |
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| EFF. | DESIG- | OUTSIDE | PITCH | BORE | DESIG- | OUTSIDE | PITCH | BORE | DESIG- | PITCH |
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| (RPM) | HP | FRAME |
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| (%) | NATION | DIA. | DIA. | (IN.) | NATION | DIA. | DIA. | (IN.) | NATION | LENGTH | QTY. | |||
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| (IN.) | (IN.) |
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| Standard | 790/970 | 5 | 184 T |
| 89.5 |
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| BK105 | 10.25 | 9.9 |
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15 TON |
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| 1VP62 | 5.95 |
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| 1 | BX81 | 82.8 | 1 | |
High | 940/1130 | 7.5 | 213 T |
| 91 | BK90 | 8.75 | 8.4 | |||||||||
| Static |
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| Low |
| 7.5 | 213 T |
| 91 |
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| Static | 910/1100 |
| 1VP68 | 6.55 |
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20 TON | Standard |
| 10 | 215 T |
| 91 |
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| BK100 | 9.75 | 9.4 | BX81 | 82.8 | 1 | |
| High | 1000/1180 | 15 | 254 T |
| 91 | 1VP71 | 7.1 |
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| Static |
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| Low |
| 7.5 | 213 T |
| 91 |
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| Static | 900/1100 |
| 1VP65 | 6.0 |
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| BX78 | 79.8 |
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25 TON | Standard |
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| 1B5V94 | 9.7 | 9.5 |
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| High | 1000/1200 | 15 | 254 T |
| 91 | 1VP71 | 7.1 |
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| BX81 | 82.8 |
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| Static |
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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 pully below 1 turn open.
TABLE 24: STATIC RESISTANCES1
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| RESISTANCE, IWG |
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DESCRIPTION |
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| CFM |
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| 15 TON |
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| 20 TON |
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| 25 TON |
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| 4500 | 6000 | 7500 | 6000 | 8000 | 9000 | 7500 | 8000 | 9000 | |
WET INDOOR COIL |
| 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.2 | |
| 18 KW | 0.3 | 0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.4 | 0.4 | 0.5 | |
ELECTRIC HEAT OPTIONS | 36 KW | 0.3 | 0.4 | 0.5 | 0.4 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
54 KW | 0.4 | 0.5 | 0.5 | 0.5 | 0.5 | 0.6 | 0.5 | 0.5 | 0.6 | ||
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| 72 KW | 0.4 | 0.5 | 0.5 | 0.5 | 0.5 | 0.6 | 0.5 | 0.5 | 0.6 | |
ECONOMIZER OPTION |
| 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.2 | |
HORIZONTAL DUCT CONNECTIONS2 | 0.1 | 0.2 | 0.3 | 0.2 | 0.3 | 0.5 | 0.3 | 0.3 | 0.5 | ||
1.Deduct these resistance values from the available external static pressures shown in the respective Blower Performance Table.
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 25: POWER EXHAUST PERFORMANCE
MOTOR |
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| STATIC RESISTANCE OF RETURN DUCTWORK, IWG |
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SPEED1 |
| 0.2 | 0.3 |
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| 0.5 |
| 0.6 | ||||
CFM |
| kW | CFM | kW | CFM |
| kW | CFM |
| kW | CFM |
| kW | |
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HIGH2 | 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 | - |
| - | - |
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1.Power exhaust motor is a 3/4 HP, PSC type with sleeve bearings, a 48 frame and inherent protection.
2.The factory setting.
38 | Unitary Products Group |
