Chromalox NWHMT Wiring, Operation, Maintenance, Renewal Parts Identification, Limited Warranty

INSTALLATION

5.DANGER: Hazard of Fire. Provide minimum of 6” spacing from a chamber and related piping to nearest combustible materi- al. Avoid operation of heater near combustible fluids or in com- bustible vapor or gas laden atmosphere.

6.Provide adequate space at terminal end to permit withdrawal of the heater from chamber should servicing be required.

7.If two or more heaters are needed to provide the needed heating capacity, arrange them for series water flow.

8.DANGER: Possible Explosion. A pressure relief valve should be provided by customer at outlet of vessel. There should be no other valving between vessel and valve.

WIRING

WARNING: Hazard of Shock. Any installation involving electric heaters must be effectively grounded in accordance with the National Electrical Code to elim- inate shock hazard.

1.Electrical wiring to heater must be installed in accordance with the National Electrical Code and/or local electrical codes by a quali- fied person as defined in the NEC.

2.When element wattages are not equal, heaters must not be con- nected in series.

3.Electrical wiring to heater should be connected in rigid conduit or in flexible hose to keep corrosive vapors and liquids out of the ter- minal housing. If high humidity is encountered, the conduit should slope down away from the heater.

4.If flexible cord is employed, a watertight connector should be used for entry of the cord into the terminal housing. Outdoor applica- tions require liquid-tight conduit and connectors.

5.Bring the power line wires through the opening in the terminal housing. Connect line wire as shown in Figures 3 through 5.

3 Pole Contactors	3 Heating Elements	2 Pole Contactors		1, 2 or 3 Heating Elements	3 Pole Contactors	3 Heating Elements
				in Series
				or Parallel
Line		Line			Line
Control		Control			Control
Volts	Thermostat	Volts		Thermostat	Volts	Thermostat
	Figure 3			Figure 4		Figure 5
For 1-Phase WYE Heaters			For 1-Phase Heaters		For 3-Phase Delta Heaters

NOTE: Dotted lines indicate “customer furnished.”

OPERATION

1.Do not heat materials that are corrosive to the heating element sheath or chamber. For water heating service, condensate drain may be provided from bottom of chamber. Check factory.

2.Terminal ends of heater must be protected from drippings, con- densation spray or direct spill-over of material whose presence at the terminals may damage heater electrical insulation. Liquid-tight

terminal housings are available to protect heater. Check with Local Chromalox Sales representative.

3.If foreign material is carried by the gaseous flow, install suitable filters in the inlet pipe to the heater.

4.Do not allow heater to operate when fluid flow is interrupted.

MAINTENANCE

WARNING: Hazard of Shock. Disconnect all power before servicing heater.

1.Remove heating element assembly periodically to check heater sheath for corrosion or excessive oxidation. Correct operating con- ditions to minimize sheath deterioration.

2.Periodically check temperature control and limit control operation to insure accurate and safe process operation.

3.Check all electrical connections periodically and retighten connec- tions which may have loosened in service. Replace wire terminals which show signs of oxidation which would interfere with estab- lishment of reliable electrical connections.

RENEWAL PARTS IDENTIFICATION

Thermostat AR-215 60-250˚F ....................................300-048518-013

Limited Warranty:

Please refer to the Chromalox limited warranty applicable to this product at

http://www.chromalox.com/customer-service/policies/termsofsale.aspx.

2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493	www.chromalox.com	TA - U0 - EF

Litho in U.S.A.