TABLE 8 - STATIC RESISTANCES 1
EXTERNAL STATIC PRESSURE DROP
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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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| 4500 | 6000 | 7200 |
| 6000 | 8000 | 9400 |
WET INDOOR COIL |
| 0.1 | 0.1 | 0.1 |
| 0.1 | 0.1 | 0.1 |
| 18 KW | 0.1 | 0.1 | 0.1 |
| 0.1 | 0.1 | 0.1 |
ELECTRIC HEAT OPTIONS | 36 KW | 0.1 | 0.2 | 0.3 |
| 0.1 | 0.2 | 0.3 |
54 KW | 0.2 | 0.3 | 0.4 |
| 0.2 | 0.3 | 0.4 | |
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| 72 KW | 0.2 | 0.4 | 0.6 |
| 0.2 | 0.4 | 0.6 |
ECONOMIZER OPTION |
| 0.1 | 0.1 | 0.1 |
| 0.1 | 0.1 | 0.1 |
HORIZONTAL DUCT CONNECTIONS2 | 0.2 | 0.3 | 0.5 |
| 0.2 | 0.3 | 0.5 | |
1Deduct these resistance values from the available external static pressures shown in the respective Blower Performance Table. (See Note 2 for exception.)
2Since 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 9 - POWER EXHAUST PERFORMANCE
MOTOR |
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| STATIC RESISTANCE OF RETURN DUCTWORK, IWG |
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| 0.2 |
| 0.3 |
| 0.4 |
| 0.5 |
| 0.6 | ||||||
SPEED |
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CFM |
| KW | CFM |
| KW | CFM |
| KW | CFM |
| KW | CFM |
| KW | |
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HIGH* | 5250 |
| 0.83 | 4500 |
| 0.85 | 4200 |
| 0.88 | 3750 |
| 0.93 | 3000 |
| 0.99 |
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MEDIUM | 4900 |
| 0.77 | 3900 |
| 0.79 | 3500 |
| 0.82 | 2900 |
| 0.85 | - |
| - |
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LOW | 4400 |
| 0.72 | 3700 |
| 0.74 | 3000 |
| 0.78 | - |
| - | - |
| - |
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*Factory Setting
Power Exhaust motor is a 3/4 HP, PSC type with sleeve bearings, a 48 frame and inherent protection.
TABLE 10 - BLOWER MOTOR AND DRIVE DATA
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| BLOWER |
| MOTOR1 | ADJUSTABLE MOTOR PULLEY | FIXED BLOWER PULLEY |
| BELT |
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MODEL |
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| (NOTCHED) |
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DRIVE | RANGE |
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| OUTSIDE | PITCH |
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| OUTSIDE | PITCH |
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| PITCH |
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SIZE |
| (RPM) | HP | FRAME | EFF. | DESIG- | DIA. | DIA. | BORE | DESIG- | DIA. | DIA. | BORE | DESIG- | LENGTH |
| QTY. |
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| (%) | NATION | (IN.) | (IN.) | (IN.) | NATION | (IN.) | (IN.) | (IN.) | NATION | (IN.) |
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| Stan- | 850/1065 |
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| BK90 | 8.75 | 8.4 | 1 | BX70 | 71.8 |
| 1 |
| dard |
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| 4.3- |
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15 TON | High |
| 5 | 184T | 83 | 1VP56 | 5.35 |
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965/1190 | 5.32 | BK80 | 7.75 | 7.4 | 1 | BX68 | 69.8 |
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| Speed |
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| Access |
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| Stan- | 870/1025 |
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| BK120 | 11.75 | 11.4 | BX83 | 84.8 |
| 1 | |
| dard |
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| 5.5- |
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20 TON | High |
| 7.5 | 213T | 89 | 1VP68 | 6.75 |
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950/1120 | 6.52 | BK110 | 10.75 | 10.4 | BX80 | 81.8 |
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| Speed |
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| Access |
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1All 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.
2Do NOT close this pulley below 1 turn open.
Unitary Products Group | 13 |
