48VLU-E, 48VLU-F Ultra Low NOx: Product Data
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
10
Selection Procedure (With Example)
DETERMINE COOLING AND HEATING REQUIREMENTS AT
DESIGN CONDITIONS:
Given:
Required Cooling Capacity (TC).......................................34,000 Btuh
Sensible Heat Capacity (SHC)...........................................25,000 Btuh
Required Heating Capacity................................................60,000 Btuh
Condenser Entering Air Temperature ...............................95°F (35°C)
Indoor-Air Temperature ..................80°F (26°C) edb 67°F (19°C) ewb
Evaporator Air Quantity....................................................... 1200 CFM
External Static Pressure ................................................ 0.100 IN. W.C.
Electrical Characteristics ........................................................208-1-60
SELECT UNIT BASED ON REQUIRED COOLING CAPACITY
Enter Net Cooling Capacities table at condenser entering temperature of
95°F (35°C). Unit 036 at 1200 CFM and 67°F (19°C) ewb (entering wet
bulb) will provide a total capacity of 34,200 Btuh and a SHC of 27,400
Btuh. Calculate SHC correction, if required, using Note 4 under Cooling
Capacities tables.
SELECT HEATING CAPACITY OF UNIT TO PROVIDE
DESIGN CONDITION REQUIREMENT.
In the Heating Capacities and Efficiencies table, note that the single
phase unit 036090 will provide 73,000 Btuh with an input of 90,000
Btuh.
DETERMINE FAN SPEED AND POWER REQUIREMENTS 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:
External Static Pressure
0.100 IN. W.C
Filter
0.07 IN. W.C
Wet Coil Pressure Drop
0.180 IN. W.C
Total Static Pressure
0.287 IN. W.C
Enter the table for Dry Coil Air Delivery—Horizontal and Downflow
Discharge. At.287 IN. W.C. ESP, the closest speed to 1200 CFM is
Med-Low (pink wire), which delivers 1213 CFM at .3 in ESP.
SELECT UNIT THAT CORRESPONDS TO POWER SOURCE
AVAILABLE.
The Electrical Data Table shows that the unit is designed to operate at
208-1-60.
