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CNA-Series Tankless Heater
3
Electric Installation
WARNING All Bradley heaters must be fused
in accordance with National
Electric Code (NEC) for the full
load amperage listed on the
nameplate rating for each heater.
WARNING Failure to properly ground the unit(s)
per the National Electric Code could
result in injury or death.
A
Open enclosure door .
NOTICE! Any option that requires field wiring
must be done with 600V cable per
the schematic that was shipped with
the heater.
NOTICE! Use a 4-core cable or multi-stranded
machine tool wire from an approved
isolating 3-pole switch or circuit
breaker.
NOTICE! Make sure the electrical cable is the
correct size to carry 100% of the full
load current. See table for proper
wire sizes.
Using a hole punch, cut a hole the
proper size for conduit connection;
B
large enough for the wire size for each
heater . The connectors need to be rated
NEMA4/4X to ensure proper sealing of
the enclosure . .
C
Run wires through the appropriate size
conduit .
D
Connect wires to the system terminal
block or fused disconnect inside the
enclosure .
E
Connect the ground wire to the stud
provided with the "Ground" label beneath it .
If unit is ordered with a D1 or DC controller
option, the DB9 connector for hookup on a
standard unit is located on the upper left/
hinge side of the cabinet . Please review the
F
appropriate Special Installation & Operation
Instruction section for information regarding
controller programming and wiring . Proceed
to the Start Up Checklist once the steps
in the Special Installation & Operation
Instructions section have been completed or
if you do not have this option .
8
CNA & CNAR ELECTRICAL SPECIFICATIONS FOR HEATER**
Model
CNA-363/600D
CNA-543/600D
CNA-633/600D
CNA-723/600D
CNA-1083/600D
CNA-1263/600D
CNA-1443/600D
CNA-363/480D
CNA-543/480D
CNA-633/480D
CNA-723/480D
CNA-1083/480D
CNA-1263/480D
CNA-1443/480D
CNA-363/415D
CNA-543/415D
CNA-633/415D
CNA-723/415D
CNA-1083/415D
CNA-1263/415D
CNA-1443/415D
CNA-363/400D
CNA-543/400D
CNA-633/400D
CNA-723/400D
CNA-1083/400D
CNA-1263/400D
CNA-1443/400D
CNA-363/380D
CNA-543/380D
CNA-633/380D
CNA-723/380D
CNA-1083/380D
CNA-1263/380D
CNA-1443/380D
* Based on the NEC Table 310 .15 for 75°C insulated copper wire @ 30°C
Ambient . Aluminum wire requires larger gauges .
** CNAR (reverse models) electrical specifications are same as CNA heater
models .
8/1/2021
Not all available (optional) voltages are listed
in the table.
Voltage
Amps
600
600
600
600
600
600
600
480
480
480
480
480
480
480
415
415
415
415
415
415
415
400
400
400
400
400
400
400
380
380
380
380
380
380
380
Installation
Min Wire
kWatts
Size
35
36
8 AWG*
52
54
6 AWG*
61
63
4 AWG*
69
72
4 AWG*
104
108
2 AWG*
121
126
1 AWG*
139
144
1/0 AWG*
43
36
6 AWG*
65
54
4 AWG*
76
63
4 AWG*
87
72
3 AWG*
130
108
1 AWG*
152
126
1/0 AWG*
174
144
2/0 AWG*
38
27
8 AWG*
56
40
6 AWG*
65
47
4 AWG*
75
54
4 AWG*
113
81
2 AWG*
131
94
1 AWG*
150
108
1/0 AWG*
36
25
8 AWG*
53
37
6 AWG*
64
44
4 AWG*
72
50
4 AWG*
108
75
2 AWG*
126
87
1 AWG*
144
100
1/0 AWG*
35
23
8 AWG*
50
33
6 AWG*
59
39
6 AWG*
68
45
4 AWG*
103
68
2 AWG*
120
79
1 AWG*
137
90
1/0 AWG*
Bradley • 215-1814 Rev. G
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