Power Supply Connections - Samsung SINGLE CNH ZDK Series Technical Data Book

Installation

Power supply connections

If the air handler has been installed prior to installing the electric heaters or if an older unit is being replaced, the supply
power wires must be checked to make sure the wires are the proper sizes to handle the current load for the heaters. Refer
to table below for correct wire size. If the supply power wire size is incorrect, new wires will need to be installed. Follow
the instructions "Power supply wiring" of these instructions for proper installation.
Indoor Unit
Model
Circuit
Qty.
AC018KNZDCH
1
/AA
AC024KNZDCH
1
/AA
AC030KNZDCH
1
/AA
AC036KNZDCH
1
/AA
AC042KNZDCH
1
/AA
AC048KNZDCH
1
/AA
1. Rated Motor Amps (at DOE External Static Rating Point)
2. Nominal Kw At 240V (Derate 25% For 208V)
3. Fuse or HACR Breaker
4. Maximum Overcurrent Device, Overcurrent Protection Installed On Breaker Models Are Sized Per MCA
To prevent damage, carefully insert the electric heating assembly through the rectangular opening in the front of the
discharge opening so the heat element support rod is seated into the hole on the back side of the discharge opening.
After installing the electric heater, a one inch clearance must be maintained on all sides of the supply air duct and/or plenum
for a minimum of thirty six inches from the air handler discharge opening.
ELECTRICAL DATA
Minimum Circuit
Electric Heater Data
Ampacity (MCA)
Amps Amps Amps Amps
208V 208V 240V 240V
208V 208V 240V 240V
Kw
(2) Circuit Circuit Circuit Circuit Circuit Circuit
1 2 1 2 1 2
SMALL CABINET-NOMINAL1.0, 1.5 & 2.0 TONS (0 To 5 Kw)
3 10.90 - 12.50 - 13.63 -
5 18.03 - 20.83 - 23.26 -
MEDIUM CABINET-NOMINAL 2.5, 3.0 TONS (0 To 10 Kw)
5 18.03 - 20.83 - 24.20 -
10 36.06 - 41.67 - 46.73 -
LARGE CABINET-NOMINAL 4.0, 4.5, 5.0, 6.0 TONS (0 To 20 Kw)
5 18.0 - 20.8 - 24.6 -
10 36.1 - 41.7 - 45.1 -
Maximum Overcurrent
Minimum Wire Size (AWG)
Protection (MOCP)
208V 208V 240V 240V Circuit 1
(3,4) (3,4) (3,4) (3,4)
167°F
(75°C)
Circuit Circuit Circuit Circuit Circuit Circuit
/ 194°F
1 2 1 2 1 2
(90°C)
15.63 - 15.0 - 20.0 - #12
26.76 - 30.0 - 30.0 - #10
27.70 - 30.0 - 30.0 - #10
53.74 - 50.0 - 60.0 - #6
26.0 - 30.0 - 30.0 - #10
52.1 - 50.0 - 60.0 - #6
Short-Circuit
Current Rating
Circuit 2 "SCCR"
167°F
140°F (75°C) 140°F kA rms V
(60°C) / 194°F (60°C) symmetrical maximum
(90°C)
#12 - - n/a n/a
#10 - - n/a n/a
#10 - - n/a n/a
#4 - - n/a n/a
#10 - - n/a n/a
#4 - - n/a n/a