Technical Guide

718434-YTG-A-0811
16 Johnson Controls Unitary Products
Sound Performance
Electric Heat Minimum Supply Air
Size
(Tons)
Model Voltage
Minimum Supply Air (CFM)
Heater kW
5.0 7.5 10.0 15.0 20.0 25.0
024
(2.0)
DEX 208/230-1-60 630 630 800 - - -
030
(2.5)
DEX 208/230-1-60 630 630 800 800 - -
036
(3.0)
DEX
208/230-1-60 1070 1070 1070 1070 - -
208/230-3-60 1070 1070 1070 1070 - -
460-3-60 1070 1070 1070 1070 - -
042
(3.5)
DEX 208/230-1-60 1225 1225 1225 1225 - -
048
(4.0)
DEX
208/230-1-60 - - 1200 1430 1430 1430
208/230-3-60 - - 1200 1430 1430 1430
460-3-60 - - 1200 1430 1430 1430
Indoor Blower Specifications
Size
(Tons)
Model
Motor
HP RPM Eff. SF Frame
024
(2.0)
DEX 1/2 Variable 0.8 1.0 48
030
(2.5)
DEX 1/2 Variable 0.8 1.0 48
036
(3.0)
DEX 1/2 Variable 0.8 1.0 48
042
(3.5)
DEX 3/4 Variable 0.8 1.0 48
048
(4.0)
DEX 3/4 Variable 0.8 1.0 48
Electric Heat Multipliers
Voltage
kW Capacity Multipliers
1
1. Electric heaters are rated at nominal voltage. Use this table to determine the electric heat
capacity for heaters applied at lower voltages.
Nominal Applied
240
208 0.75
230 0.92
480 460 0.92
Outdoor Sound Power Levels
Size
(Tons)
Model
Sound Rating
1
dB (A)
1. Rated in accordance with ARI 270 standard.
Octave Band Centerline Frequency (Hz)
125 250 500 1000 2000 4000 8000
024
(2.0)
DEX 73 61.5 64.5 68.5 66.5 62 60 54
030
(2.5)
DEX 77 60 62.5 64.5 75.5 62.5 59.5 58.5
036
(3.0)
DEX 78 63 65 76 73 64.5 62.5 60
042
(3.5)
DEX 76 67.5 68.5 69.5 69 66 63.5 60
048
(4.0)
DEX 79 71.5 69.5 71.5 75.5 68 67 62