Chromalox CVEP-C installation instructions Wiring, Operation, Diagram

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.

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.

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.

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.

Single Phase — No Controls, 120-277V	Single Phase — No Controls, Volts > 277V
& Heater Amps < 22A	& 120–277V When Heater Amps > 22A
Elements	External
	Contactor	Elements

	Optional Thermostat	Control		Optional Thermostat
		Voltage		Built-In or Ext. Supplied
Diagram 1	Built-In or Ext. Supplied	Diagram 2
Three Phase – No Controls		Single or Three Phase
		With Controls — Contactor & Transformer
External			Contactor
Contactor	Elements			Element Wiring
				1 PH or 3 PH
				Single or Double
				Element
Control	Optional Thermostat
Voltage
	Built-In or Ext. Supplied
				Optional Thermostat
Diagram 3		Diagram 4	Transformer
				Built-In or Ext. Supplied
Single or Three Phase		Single or Three Phase With Controls —
		Contactor & External Supplied Control Voltage
With Controls — Contactor & Line Voltage Control
Contactor			Contactor	Element Wiring
	Element Wiring
				1 PH or 3 PH
	1 PH or 3 PH			Single or Double
	Single or Double
				Element
	Element
Line		External
Voltage	Optional Thermostat	Supplied
Control		Control
	Built-In or Ext. Supplied			Optional Thermostat
Voltage		Voltage	Terminal
				Built-In or Ext. Supplied
Diagram 5		Diagram 6	Block

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