Keltech SNA-36 - Electric Installation

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