Fig. 1 — 50KC 04-06 Model Number Nomenclature (Example)
Coil Options  (outdoor-indoor-hail guard
A = Al/Cu - Al/Cu    
B = Precoat Al/Cu - Al/Cu   
C = E-coat Al/Cu - Al/Cu      
D = E-coat Al/Cu - E-coat Al/Cu  
E = Cu/Cu - Al/Cu      
F = Cu/Cu - Cu/Cu 
M = Al/Cu - Al/Cu – Louvered Hail Guards
N = Precoat Al/Cu - Al/Cu – Louvered Hail Guards
P = E-coat Al/Cu - Al/Cu – Louvered Hail Guards 
Q = E-coat Al/Cu - E-coat Al/Cu – Louvered Hail Guards
R = Cu/Cu - Al/Cu – Louvered Hail Guards
S = Cu/Cu - Cu/Cu – Louvered Hail Guards
5 0 K C - A 0 4 A 0 A 5 - 0 A 0 A 0
Unit Heat Type
50 – Cooling with Electric 
Heat
Series/Model
KC – 14 SEER Efficiency
Refrig. Systems Options
A - Standard One Stage Cooling Models
B – Standard One Stage Cooling Models
      with Humidi-MiZer 
Cooling Tons      
04 - 3 ton       
05 - 4 ton 
06 - 5 ton 
Packaging and Seismic Compliant
0 = Standard
1 = LTL
Electrical Options
A = None
C = Non-Fused Disconnect
D = Thru-The-Base Connections
F = Non-Fused Disconnect and Thru-The-Base 
      Connections
Service Options
0 = None
1 = Unpowered Convenience Outlet
2 = Powered Convenience Outlet
3 = Hinged Panels
4 = Hinged Panels, Unpowered Convenience Outlet
5 = Hinged Panels, Powered Convenience Outlet
Intake / Exhaust Options
A = None
B = Temperature Economizer w/ Barometric Relief
F = Enthalpy Economizer w/ Barometric Relief
K = 2-Position Damper
U = Temp Ultra Low Leak Economizer w/Baro Relief
W = Enthalpy Ultra Low Leak Econo w/Baro Relief
Base unit controls
0 = Electro-mechanical Controls Can be used with W7212 
      EconoMi$er IV (Non – Fault Detection and Diagnostic)
1 = PremierLink Controller
2 = RTU Open Multi-Protocol Controller
6 = Electro-mechanical - Can be used with W7220 EconoMi$er X 
      (with Fault Detection and Diagnostic)
Sensor Options
A = None
B = RA Smoke Detector
C = SA Smoke Detector
D = RA + SA Smoke Detector
E = CO
2
F = RA Smoke Detector and CO
2
G = SA Smoke Detector and CO
2
H = RA + SA Smoke Detector and CO
2
J = Condensate Overflow Switch (electro mech controls only)
K = Condensate Overflow Switch and RA Smoke Detectors
L = Condensate Overflow Switch and RA and SA Smoke 
Detectors 
Indoor Fan Options 
0 = Direct Drive X13 Motor 
2 = Medium Static Option – Belt Drive
3 = High Static Option – Belt Drive
Design Revision
Factory Assigned
Voltage
1 = 575/3/60            5 = 208-230/3/60
3 = 208-230/1/60 6 = 460/3/60
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Note:  On single phase (-3 voltage code) models, the following 
are not available as a factory installed option:
 - Humidi-Mizer
 - Coated Coils or Cu Fin Coils
 - Louvered Hail Guards
 - Economizer or 2 Position Damper
 - Powered 115 Volt Convenience Outlet
Not all possible options can be displayed above.     
 
Heat Size
- - No Heat
)