Chromalox PD412-5 - Manual (Page 2)

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.
9 9 - 0 5 8
T A - S9 - E F
Litho in U.S.A.
2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493 www.chromalox.com
WIRING
WARNING: Hazard of Shock. Any installation involving
electric heaters must be effectively grounded in
accordance with the National Electrical Code to elimi-
nate shock hazard.
1. Electrical wiring to heater must be installed in accordance with the
National Electrical Code and with local codes by a qualified per-
sonas defined in the NEC.
2. When element wattages are not equal, heaters must not be connect-
ed in series.
3. Electrical wiring to heater should be contained in rigid conduit or in
sealed flexible hose to keep corrosive vapors and liquids out of the
terminal housing. If high humidity is encountered, the conduit
should slope away from the heater.
4. If flexible cord is employed, a watertight connector should be used
for entry of the cord into the terminal box. Outdoor applications
require liquid-tight conduit and connectors.
5. 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). Ground
Thermostat Heating
Element
Power
Supply
L1
L2
Contactor
Heating
Element(s)
Ground
Thermostat
Power
Supply
Control
Circuit
T1
T2
L1
L2
Contactor
Heating
Elements
Ground
Thermostat
Three
Phase
Power
Supply
Control
Circuit
T1
T2
T3
L1
L2
L3
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.
Diagram 1 — Single Phase Heater and Thermostat
Diagram 2 — Single Phase Heater with Contactor and Thermostat Diagram 3 — Three Phase Heater Group with Contactor and Thermostat
INSTALLATION
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.