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TA- U0 - EF
Litho in U.S.A.
1347 HEIL QUAKER BLVD., LAVERGNE, TN 37086
Phone: (615) 793-3900 www.chromalox.com
WIRING
OPERATION
MAINTENANCE
RENEWAL PARTS IDENTIFICATION
1. Do not heat materials that are corrosive to the heating element
sheath or chamber.
WARNING: Type NWHO Circulation Heaters are
equipped with steel heating elements and galva-
nized-steel heating chambers. It is the responsibil-
ity of the user to know the chemical composition of
the corrosive solution and the character of the
materials entering the solution as well as the cor-
rosive effect of the solution upon the heating ele-
ments and chamber. Chromalox cannot warrant
any electric circulation heater against failure by
sheath corrosion if such failure is the result of
operating conditions beyond our control.
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 enclosures are available to protect heater.
Check Factory.
3. If foreign material is carried by the fluid flow, install suitable
filters in the inlet pipe line to the heater.
4. Do not allow heater to operate when oil flow is interrupted.
CAUTION: Hazard of Electric Shock. Any installa-
tion involving electric heaters must be grounded to
earth to eliminate shock hazard.
1. Electric wiring to heater must be installed in accordance with
National Electrical Code and with local codes.
2. Because of high operating temperatures expected, aluminum
wiring is not recommended.
3. Refer to Wiring Diagram Figure B for the typical wiring used
for connecting the NWHO-45 series heater.
4. Three 3 phase circuits is a typical design for these heaters.
Other circuit arrangements are often supplied depending upon
customer specifications or amperage rating.
1L1
1L2
1L3
2L1
2L2
2L3
3L1
3L2
3L3
Over-Temp
Cutout
120V
or
240V
Thermostat
Contactor
Fuses
Fuses
Fuses
Contactor
Contactor
1. CAUTION: Hazard of Electric Shock. Disconnect
all power before servicing heater.
2. Remove heating element assembly periodically to check heater
sheath for corrosion or excessive oxidation. Correct operating
conditions to minimize sheath deterioration.
3. Periodically check temperature control and pressure-tempera-
ture safety limit control operation to insure accurate and safe
process operation.
4. Check all electrical connections periodically and retighten con-
nections which may have loosened in service. Replace wire
and wire terminals which show signs of oxidation which would
interfere with establishment of reliable electrical connections.
Order Renewal Parts on a Special Order Basis. Give the name
of the part, part number, voltage, wattage and any special features
to your local Chromalox Representative or the factory.
Figure B
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.