Bryant 582A manual SELECTION PROCEDURE with example

SELECTION PROCEDURE (with example)

I DETERMINE COOLING AND HEATING REQUIRE- MENTS AT DESIGN CONDITIONS:

Given:

Required Cooling Capacity (TC) . . . . . . . . . . 34,000 Btuh Btuh Sensible Heat Capacity (SHC) . . . . . . . 25,000 Btuh Btuh Required Heating Capacity . . . . . . . . . 60,000 Btuh Condenser Entering Air Temperature . . . . . . . . . . . . 95 F Indoor-Air Temperature . . . . . . . . . . . 80 F edb 67 F ewb Evaporator Air Quantity . . . . . . . . . . . . . . . . . . . 1200 cfm External Static Pressure . . . . . . . . . . . . . . . . . . 0.4 in. wg Electrical Characteristics . . . . . . . . . . . . . . . . . . 230-1-60

IISELECT UNIT BASED ON REQUIRED COOLING CAPACITY.

Enter Net Cooling Capacities table at outdoor entering temperature of 95 F. Unit 582A036 at 1200 cfm and 67 F ewb (entering wet bulb) will provide a total capacity of 34,400 Btuh and a SHC of 25,400 Btuh.

IIISELECT HEATING CAPACITY OF UNIT TO PROVIDE DESIGN CONDITION REQUIREMENTS.

In the Heating Capacities and Efficiencies table on page 3, note that the unit 582A036090 will provide 71,910 Btuh with an input of 90,000 Btuh.

IV DETERMINE FAN SPEED AND POWER REQUIRE- MENTS AT DESIGN CONDITIONS.

Before entering the air delivery tables, calculate the total static pressure required. From the given example, the Wet Coil Pressure Drop Table, and the Filter Pressure Drop table on page 15, find at 1200 cfm:

External Static Pressure	0.40 in. wg
Wet Coil	0.10 in. wg
Filter/Economizer	+ 0.12 in. wg
Total Static Pressure	0.62 in. wg

Enter the table for Dry Coil Air Delivery – Horizontal and downflow Discharge for 230 V and 460 V on page 14. The fan will deliver 1360 cfm at 0.60 ESP (external static pres- sure) at high speed and 1167 cfm at 0.60 ESP at medium speed. The fan speed should be set at high.

V SELECT UNIT THAT CORRESPONDS TO POWER SOURCE AVAILABLE.

The Electrical Data table on page 21 shows that the unit is designed to operate at 230-1-60.

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