Chromalox NWHMTO Prospecto

1. Electrical wiring to heater must be installed in accordance with the

National Electrical Code and local electrical codes by a qualified
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 box. Outdoor applications
require liquid-tight conduit and connectors.

5. Bring the power line wires through the opening in the terminal

box. Connect line wire as shown in the diagram. (Figures 1 thru 3)

Note: Dotted lines indicate “customer furnished.”

1. Do not heat materials that are corrosive to the heating element

sheath or chamber. For oil heating service, drain may be provided
from bottom of chamber. Check factory.

2. Terminal ends of heater must be protected from drippings conden-

sation spray or direct spill-over of material whose presence at the
terminals may damage heater electrical insulation. Liquid-tight ter-

minal enclosures are available to protect heater. Check with local
sales representative.

3. If foreign material is carried by the oil flow, install suitable filters

in the inlet pipe line to the heater.

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

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.

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

TA - U0 - EF

Litho in U.S.A.

3 Pole Contactors

3 Heating Elements

Line

Control
Volts

Thermostat

2 Pole Contactors

1, 2, or 3 Heating Elements

in Series

Line

Control
Volts

Thermostat

or Parallel

3 Pole Contactors

3 Heating Elements

Line

Control
Volts

Thermostat

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

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