III. ELECTRICAL HOOK-UP
WARNING
BEFORE BEGINNING ANY WORK ON THE ELECTRICAL INSTALLATION,
BE SURE THE SWITCH AT MAIN BREAKER PANEL IS “OFF” TO AVOID
ANY DANGER OF ELECTRICAL SHOCK.
“Series-two” heaters are manufactured to the following specifications:
This unit must have its own independent circuits, using 2 SETS of UL listed 2 conductor and
ground core copper wire cable of the appropriate size protected by 2 separate and independent
correctly rated Double Pole breakers. (208, 220, 240 V, see Figures 4 and 5). For 277 Volt models
use correctly rated single pole breakers.
Wire entry into the unit must be made through the hole provided in the flange on the backplate.
The “live” wires should be connected to the slots in the terminal block marked L1 and L2. The
ground lead must be connected to the slot marked GND. (277 models have neutral “N” slots.)
GROUND MUST BE BROUGHT TO THE “GROUND” AT THE CIRCUIT BREAKER PANEL.
DANGER
FAILURE TO GROUND THE SYSTEM MAY RESULT IN DEATH OR SERIOUS INJURY.
* Units rated for 240 V can operate at 220 V or 208V with reduced output.
The output will vary in accordance with the following ratios:
208 volts 220 volts 240 volts
.75 .84 1.0
output ratio
volts
MODEL TYPE OUTPUT / kW VOLTAGE / V AMPERAGE
EX 190 19 240 2 x 39 Amps
EX 144 15 240 2 x 32 Amps
EX 200 20 277 2 x 36 Amps
EX 160 16 277 2 x 29 Amps
EX1608 16.6 208 2 x 39 Amps
ONON
OFFOFF
ONON
OFFOFF
2 Separate and independent
correctly rated Double pole
breakers (240/208 Volts)
Figure 4
Figure 5
6
*
*
Circuit Breaker Panel
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