TABLE 6: BELT DRIVE BLOWER MOTOR AND DRIVE DATA
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| MOTOR1 | ADJUSTABLE MOTOR PULLEY |
| FIXED BLOWER PULLEY |
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| BELT |
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MODEL | BLOWER |
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| (NOTCHED) |
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RANGE |
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SIZE |
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| DESIG- | OUTSIDE | PITCH |
| BORE | DESIG- | OUTSIDE | PITCH |
| BORE | DESIG- | PITCH |
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(RPM) | HP | FRAME | DIA. | DIA. |
| DIA. | DIA. |
| LENGTH | QTY. | ||||||
| NATION |
| (IN.) | NATION |
| (IN.) | NATION | |||||||||
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| (IN.) | (IN.) |
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| (IN.) | (IN.) |
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| (IN.) |
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6 TON | 900/1250 | 1 1/2 | 56 | 1VL44 |
| 7/8 | AK56 | 5.4 | 5.2 |
| 1 | A36 | 37.3 | 1 | ||
1.All motors have solid bases and are inherently protected. these motors can be selected to operate into their service factor because they are located in the moving air, upstream of any heating device.
TABLE 7: STATIC RESISTANCES
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| RESISTANCE, IWG |
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DESCRIPTION |
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| CFM |
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| 1000 | 1200 | 1400 | 1600 | 1800 | 2000 | 2200 | 2400 | 2600 | 2800 | 3000 |
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ECONOMIZER1 3 | 0.07 | 0.08 | 0.09 | 0.11 | 0.13 | 0.15 | 0.17 | 0.20 | 0.23 | 0.26 | 0.30 | |
ELECTRIC | 0.04 | 0.05 | 0.06 | 0.07 | 0.08 | 0.10 | 0.12 | 0.14 | 0.16 | 0.19 | 0.22 | |
HEATERS1 | 0.06 | 0.07 | 0.08 | 0.09 | 0.11 | 0.13 | 0.15 | 0.17 | 0.20 | 0.23 | 0.26 | |
BOTTOM DUCT CONNECTIONS1 | 0.06 | 0.07 | 0.08 | 0.09 | 0.10 | 0.11 | 0.12 | 0.14 | 0.16 | 0.19 | 0.22 | |
COOLING ONLY2 | 0.08 | 0.10 | 0.12 | 0.14 | 0.16 | 0.18 | 0.20 | 0.23 | 0.26 | 0.29 | 0.32 | |
1.Deduct these resistance values from the available external static pressure shown in SUPPLY AIR BLOWER PERFORMANCE Tables.
2.Add these resistance values to the available static resistance values on SUPPLY AIR BLOWER PERFORMANCE Tables.
3.The pressure through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct system is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.
TABLE 8: ELECTRIC HEATER CFM LIMITATIONS
UNIT MODEL SIZE NOMINAL |
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| MINIMUM SUPPLY AIR CFM |
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VOLTAGE |
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| HEATER SIZE NOMINAL KW |
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TONS |
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| 5 | 7 | 10 | 15 | 20 | 30 | |
| 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | ||
6 | 1800 | 1800 | 1800 | 1800 | 1800 | 1800 | ||
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- | 1800 | 1800 | 1800 | 1800 | 1800 | |||
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| - | - | 1800 | 1800 | 1800 | 1800 | ||
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Unitary Products Group | 19 |
