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| TABLE 11: ELECTRIC HEAT MINIMUM SUPPLY AIR | The Power Exhaust factory installed option is for Down Flow | |||||
| IMPERIAL |
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| application only. | |||
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| There are two field installed Power Exhaust accessories: | ||||
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| HEATER | UNIT MODEL SIZE, NOMINAL TONS | ||||
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| 1. Down Flow application. | |||||
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| kW |
| VOLTAGE | 7.5 | 10 | ||
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| 2. Horizontal Flow application that requires the purchase of | |||
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| MINIMUM SUPPLY AIR CFM | |||||
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| a barometric relief hood. | |
9 |
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| 2250 | N/A | |||
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| RAIN HOOD | |
18 |
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| 2250 | 3000 | |||
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24 |
| 380/415 | 2250 | 3000 | All of the hood components, including the filters, the gasket- | ||
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36 |
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| 2250 | 3000 | ing and the hardware for assembling, are packaged and | ||
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| located between the condenser coil section and the main unit | |
54 |
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| N/A | 3000 | |||
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| cabinet, if the unit has factory installed options. If field | |||||
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| METRIC |
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| installed accessories are being installed all parts necessary | |||
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| for the installation comes in the accessory. | ||||
| HEATER | UNIT MODEL SIZE, NOMINAL TONS | ||
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kW |
| VOLTAGE | 7.5 | 10 |
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| MINIMUM SUPPLY AIR M3S | |||
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9 |
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| 1.06 | N/A |
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18 |
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| 1.06 | 1.42 |
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24 |
| 380/415 | 1.06 | 1.42 |
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36 |
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| 1.06 | 1.42 |
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54 |
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| N/A | 1.42 |
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MOTORIZED OUTDOOR DAMPER
The Motorized Outdoor Damper can be a factory installed option or a field installed accessory. If factory installed, refer to the instructions included with the outdoor air hood to com- plete the assembly. Field installed Motorized Outdoor Damper accessories include complete instructions for instal- lation.
ECONOMIZER
The Economizer can be a factory installed option or a field installed accessory. If factory installed, refer to the instruc- tions included with the outdoor air hood to complete the assembly. Field installed Economizer accessories include complete instructions for installation.
There are two Economizer options:
1.Down Flow application with barometric relief hood stan- dard.
2.Horizontal Flow application that requires the purchase of a barometric relief hood.
POWER EXHAUST
The Power Exhaust can be a factory installed option or a field installed accessory. If factory installed, refer to the instruc- tions included with the outdoor air hood to complete the assembly. Field installed Power Exhaust accessories include complete instructions for installation.
ECONOMIZER AND POWER EXHAUST SET POINT ADJUSTMENTS AND INFORMATION
Remove the top rear access panel from the unit. Locate the economizer control module, where the following adjustments will be made.
Extreme care must be exercised in turning all set point, maximum and minimum damper positioning adjustment screws to prevent twisting them off.
MINIMUM POSITION ADJUSTMENT
•Check that the damper blades move smoothly without binding; carefully turn the Minimum Position Adjust screw (found on the damper control module) fully clock- wise and then set the thermostat indoor fan switch to the ON position and then OFF or energize and
•With the thermostat set to the indoor fan ON position or terminals “R” to “G” energized, turn the Minimum Posi- tion Adjusting screw (located on the damper control module) counterclockwise until the desired minimum damper position has been attained.
ENTHALPY SET POINT ADJUSTMENT
The enthalpy set point may now be set by selecting the desired set point shown in the Enthalpy Set Point Adjustment Figure 20. Adjust as follows:
•For a single enthalpy operation carefully turn the set point adjusting screw (found on the damper control mod- ule) to the "A", "B", "C" or "D" setting corresponding to the lettered curve of the Enthalpy Set Point Adjustment Figure 20.
20 | Unitary Products Group |