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SELECTION PROCEDURE
I DETERMINE COOLING AND HEATING REQUIRE-
MENTS AT DESIGN CONDITIONS:
Given:
Required Cooling Capacity (TC) ..........34,000 Btuh
Sensible Heat Capacity (SHC) ...........24,000 Btuh
Required Heating Capacity ..............60,000 Btuh
Condenser Entering-Air Temperature ............95F
Indoor-Air Temperature ...........80Fedb, 67 F ewb
Evaporator-Air Quantity ...................1200 cfm
External Static Pressure .................0.20 in. wg
Electrical Characteristics (V-Ph-Hz) ..........208-1-60
II SELECT UNIT BASED ON REQUIRED COOLING
CAPACITY.
Enter Net Cooling Capacities table at condenser entering
temperature of 95 F. Unit 588A036 at 1200 cfm and 67 F
ewb (entering wet bulb) will provide a total capacity of
36,000 Btuh and an SHC of 26,200 Btuh. Calculate SHC
correction, if required, using Note 4 under Net Cooling Ca-
pacities tables.
III SELECT HEATING CAPACITY OF UNIT TO PROVIDE
DESIGN CONDITION REQUIREMENT.
In the Heating Capacities and Efficiencies table on page 4,
note that unit 588A036080 will provide 64,800 Btuh with an
input of 80,000 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, the Wet Coil
Pressure Drop table, and the Filter Pressure Drop table on
page 19, find at 1200 cfm:
External static pressure 0.20 in. wg
Wet Coil 0.088 in. wg
Filter 0.13 in. wg
Total static pressure 0.42 in. wg (rounded)
Enter the table for Dry Coil Air Delivery — Horizontal Dis-
charge for 230 and 460 V on page 17. For 208 v operation,
deduct 10% from value given. The fan will deliver 1233 cfm
at 0.4 external static pressure (1370 x 0.9) at high speed
and 852 cfm at 0.5 external static pressure (946 x 0.9) at
low speed. The fan speed should be set at high to satisfy
job requirements.
V SELECT UNIT THAT CORRESPONDS TO POWER
SOURCE AVAILABLE.
The Electrical Data table on page 20 shows that the unit
is designed to operate at 208-1-60.
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