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WIRING
ELECTRIC SHOCK HAZARD. Any installation
involving electric heaters must be performed by a
qualified person and must be effectively grounded
in accordance with the National Electrical Code to
eliminate shock hazard.
1. All wiring should be done in accordance with local codes and
the National Electrical Code by a qualified person as defined in
the NEC.
CAUTION: Use copper conductors only.
2. Rough-in-line-wiring to unit in manner approved for hazardous
locations. (See warning below.)
3.
Wire per diagrams 1 through 6 based on the rating and control
options listed in table 2. Refer to table 3 for amperage specifications.
4. Remove cover of conduit box for connections. Use either opening
and plug the other with the plug provided.
5. In single phase units the heaters must be wired in parallel, com-
bining L1 to L1, L2 to L2 and for 3 phase unit, L3 to L3.
6. Re-assemble cover with a minimum of 7 turns.
FIRE/EXPLOSION HAZARD.
(Group B atmospheres)
To prevent ignition of Group B atmospheres, conduit
runs must not exceed 3/4” in size and all conduit
runs 1/2” size and larger must have a sealing fitting
connected within 2”, 6” or 18” of the terminal enclo-
sure depending on the exact model. For correct
placement, refer to data located on the enclosure
label.
OPERATION
The system designer is responsible for the safety
of this equipment and should install adequate
back-up controls and safety devices with their
electric heating equipment. Where the conse-
quences of failure could result in personal injury or
property damage, back-up controls are essential.
1. Do not operate heater at voltages in excess of that stamped on
the heater since excess voltage will shorten heater life and
cause high element temperatures which may exceed allowable
temperatures of operation in a hazardous atmosphere.
3
Elements
Optional Thermostat
Built-In or Ext. Supplied
Single Phase — No Controls, 120-277V
& Heater Amps < 22A
Diagram 1
Diagram 3
Diagram 5
Diagram 2
Diagram 4
Diagram 6
Elements
Optional Thermostat
Built-In or Ext. Supplied
Single Phase — No Controls, Volts > 277V
& 120–277V When Heater Amps > 22A
External
Contactor
Control
Voltage
Elements
Optional Thermostat
Built-In or Ext. Supplied
External
Contactor
Control
Voltage
Three Phase – No Controls
Optional Thermostat
Built-In or Ext. Supplied
Contactor
Transformer
Element Wiring
1 PH or 3 PH
Single or Double
Element
Single or Three Phase
With Controls — Contactor & Transformer
Optional Thermostat
Built-In or Ext. Supplied
Contactor
Line
Voltage
Control
Voltage
Element Wiring
1 PH or 3 PH
Single or Double
Element
Single or Three Phase
With Controls — Contactor & Line Voltage Control
Optional Thermostat
Built-In or Ext. Supplied
Contactor
Element Wiring
1 PH or 3 PH
Single or Double
Element
Single or Three Phase With Controls —
Contactor & External Supplied Control Voltage
Terminal
Block
External
Supplied
Control
Voltage