77
Ins
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C.2 Electrical
WARNING
WARNING.
Disconnect the power supply before
installation of the heater.
Lock the switch in the
“OFF”
(open) position and/or tag
the switch to prevent unexpected power application.
For heaters marked "IIC", insure to loosen the setscrew
before removing the cover. Installation and wiring of the
heater must adhere to all applicable codes.
1.
General
1.1 Use only copper conductors and approved
explosion-proof wiring methods during installation.
Refer to the Section H.1 1-Phase, page 12 and
Section H.2 3-Phase, page 14, or heater data
plate for the voltage, amperage and wattage ratings
when sizing for the appropriate conductors. All
supply conductors should be rated for operating at
temperatures up to 194°F (90°C).
1.2
Supply voltage must be within 10% of the data plate
rating. External over-current protection is required
and must meet data plate ratings for voltage,
amperage and frequency.
2.
Field Wiring
Heater has been supplied with an enclosure that has a
3/4" NPT or 1" NPT threaded opening to accommodate
the line conductors (see Figure 3, page 5 to for
connection details). Use wire connectors rated for
minimum 194°F (90°C).
NOTE:
If remote thermostats other than the factory supplied are
used, ensure that they will not allow the room temperature
to exceed ambient temperature limitations of the heater
(104°F/40°C) and are suitable for the area’s hazardous
atmosphere classification. When using any control devices,
ensure that the voltage and amperage ratings match
the heater’s electrical ratings. If not, a contactor may
be required.
3.
Final Inspection
3.1
Before application of electrical power:
–
Check that all connections are secured and comply
with the wiring diagram (see Figure 6 and Figure 7,
page 7 and applicable code requirements,
–
Confirm that the supply voltage and phase is
compatible with the data plate specifications,
–
Remove any foreign objects from the heater, and
–
Ensure all external fittings and enclosure covers
are secured.
Element
Room
Thermostat
L1*
L2
Element
* On 120V units
L1 represents
neutral
Figure 6 – Wiring Diagram for remote mount and built-in room
thermostats (1Ø units)
Elements
DPST Room
Thermostat
L1
L2
L3
GND
Figure 7 – Wiring Diagram for remote mount and built-in room
thermostats (3Ø units)