Chromalox PD412-5 operating instructions Wiring, Operation, Maintenance

INSTALLATION

B.Through-the-Wall

Model CIT-218 (Figure 3) is designed for through-the-wall installation.

1.To install, drill three holes in side of crucible at proper height using hole dimensions shown in Figure 4 or by using gasket enclosed with heater as a template.

2.Insert heater first through gasket and then through tank wall opening making sure that gasket is firmly seated between heater flange and tank wall.

3.Using standard hardware bolts and nuts consistent with the hole diameter and the tank wall thickness, secure heater into place.

DANGER: Hazard of Fire. - Since these heaters are capable of developing high temperatures, extreme care should be taken to:

A.Avoid installing heaters in an atmosphere containing combustible gases and vapors.

B.Avoid contact between heater and combustible material.

C.Keep combustible materials far enough away to be free of the effects of high temperatures.

WIRING

WARNING: Hazard of Shock. Any installation involving				2.	sonas defined in the NEC.
electric heaters must be effectively grounded in					When element wattages are not equal, heaters must not be connect-
accordance with the National Electrical Code to elimi-				3.	ed in series.
nate shock hazard.					Electrical wiring to heater should be contained in rigid conduit or in
1. Electrical wiring to heater must be installed in accordance with the					sealed flexible hose to keep corrosive vapors and liquids out of the
					terminal housing. If high humidity is encountered, the conduit
National Electrical Code and with local codes by a qualified per-
					should slope away from the heater.
Heating	Thermostat			4.
					If flexible cord is employed, a watertight connector should be used
Element		L1
			Power		for entry of the cord into the terminal box. Outdoor applications
		L2	Supply		require liquid-tight conduit and connectors.
				5.
	Ground				Bring the power line wires through the opening in the terminal box.
					Connect line wires as shown in the appropriate wiring diagrams
					(see Diagrams 1, 2 and 3).

Diagram 1 — Single Phase Heater and Thermostat

Heating	Contactor			Contactor
Element(s)			T1	L1	Three
	T1	Power
	L1		T2	L2	Phase
	T2	Supply	T3		Power
	L2			L3
					Supply
				Thermostat
		Control	Heating		Control
		Circuit			Circuit
	Thermostat		Elements
	Ground		Ground
Diagram 2 — Single Phase Heater with Contactor and Thermostat			Diagram 3 — Three Phase Heater Group with Contactor and Thermostat

OPERATION

1.Do not operate heaters at voltages in excess of that stamped on the heater since excess voltage will shorten life.

2.Always maintain 6" to 8" of liquid above the heated portion of the element to prevent exposure of the effective heated length. If the heater is not properly submerged, it may overheat and shorten heater life. DO NOT OPERATE HEATER IF DRY.

3.Sludge should not be allowed to buildup to the point where it con- tacts heater as this can lead to premature heater failure.

4.Buildup of dross accumulation on the surface of liquid metal should be prevented to insure satisfactory operation of the heater.

5.When melting solids by direct immersion, a surface vent should be provided to allow gases to escape.

MAINTENANCE

WARNING: Hazard of Shock. Disconnect all power to heater before servicing or replacing heaters.

1.Heaters should be checked periodically for coatings and corrosion and cleaned if necessary.

2.The tank should be checked regularly for sediment around the heater as sediment can act as an insulator and shorten heater life.

3.Remove any accumulated sludge deposits from heater and from tank.

4.Check for loose terminal connections and tighten if necessary.

5.If corrosion is indicated in the terminal housing, check terminal box gasket and replace if necessary. Check conduit layout to correct con- ditions that allow corrosion to enter the terminal housing.

6.Clean terminal ends of all contamination.

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		99 - 058
		TA - S9 - EF
Phone: 1-800-368-2493	www.chromalox.com
		Litho in U.S.A.