6
SNA-Series Tankless Heater
Installation
10/17/2014
Keltech •
215-1815 Rev. B; ECN 130011
Electric Installation
3
CAUTION! Failure to properly ground the unit(s) per the National Electric Code could result in injury or death.
B
Using a hole punch, cut a hole the proper
size for conduit connection; large enough
for the wire size for each heater . The
connectors need to be rated NEMA4/4X
to ensure proper sealing of the enclosure .
(See Figure 2 for suggested location) .
A
Open enclosure door .
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 .
Any option that requires field wiring must
be done with 600V cable per the schematic
shipped with the heater.
Use a 4-core cable or multi-stranded
machine tool wire from an approved
isolating 3-pole switch or circuit breaker.
Make sure the electrical cable is the
correct size to carry 100% of the full load
current. See Table 1 for proper wire sizes.
IMPORTANT! All Keltech heaters must be fused in accordance with National Electric Code for the full
load amperage listed on the nameplate rating for each heater.
CAUTION! To avoid damage to the electronics or internal wiring, do not perform any brazing or sweat
soldering inside the enclosure.
ELECTRICAL SPECIFICATIONS FOR HEATER (PHASE 3)
Model
Voltage
Amps
kWatts
Min Wire
Size
SNA-363/600D
600
35
36
8 AWG*
SNA-543/600D
600
52
54
6 AWG*
SNA-633/600D
600
61
63
4 AWG*
SNA-723/600D
600
69
72
4 AWG*
SNA-1083/600D
600
104
108
2 AWG*
SNA-1263/600D
600
121
126
1 AWG*
SNA-1443/600D
600
139
144
1/0 AWG*
SNA-363/480D
480
43
36
6 AWG*
SNA-543/480D
480
65
54
4 AWG*
SNA-633/480D
480
76
63
4 AWG*
SNA-723/480D
480
87
72
3 AWG*
SNA-1083/480D
480
130
108
1 AWG*
SNA-1263/480D
480
152
126
1/0 AWG*
SNA-1443/480D
480
174
144
2/0 AWG*
SNA-363/415D
415
38
27
8 AWG*
SNA-543/415D
415
56
40
6 AWG*
SNA-633/415D
415
65
47
4 AWG*
SNA-723/415D
415
75
54
4 AWG*
SNA-1083/415D
415
113
81
2 AWG*
SNA-1263/415D
415
131
94
1 AWG*
SNA-1443/415D
415
150
108
1/0 AWG*
SNA-363/400D
400
36
25
8 AWG*
SNA-543/400D
400
53
37
6 AWG*
SNA-633/400D
400
64
44
4 AWG*
SNA-723/400D
400
72
50
4 AWG*
SNA-1083/400D
400
108
75
2 AWG*
SNA-1263/400D
400
126
87
1 AWG*
SNA-1443/400D
400
144
100
1/0 AWG*
SNA-363/380D
380
35
23
8 AWG*
SNA-543/380D
380
50
33
6 AWG*
SNA-633/380D
380
59
39
6 AWG*
SNA-723/380D
380
68
45
4 AWG*
SNA-1083/380D
380
103
68
2 AWG*
SNA-1263/380D
380
120
79
1 AWG*
SNA-1443/380D
380
137
90
1/0 AWG*
TABLE 1
* Based on the NEC Table 310 .15 for 75°C insulated wire @ 30°C Ambient
