Chromalox PN403-1 - Manual (Page 6)

6
Maintenance
FIRE or EXPLOSION HAZARD. Do not open en-
closure when energized. Do not open enclosure
when an explosive gas atmosphere is present.
ELECTRIC SHOCK HAZARD. Disconnect all
power before installing or servicing heater.
Failure to do so could result in personal injury
or property damage. Heater must be installed
or serviced by a qualified person in accordance
with applicable National Electric Codes, NFPA
70, and/or International Electric Codes.
1. Make certain both the terminals and the ceramic
insulators are free from contact with oil, liquid, or
other foreign matter.
NOTE: Chromalox cannot be
responsible for failures or damage caused by con-
tamination on the ceramic insulators. Make certain
the heaters are not exposed to contaminants.
2. Check electrical connections at heater terminals
and tighten if necessary. This will help avoid hot ter-
minals which may destroy wire insulation or heater
terminals
3. Check overheat operation to assure heater protection.
Element Replacement - Moisture Resistant Hous-
ing Only (E4 Option)
1. To remove the OCE heating elements, first turn the
circuit breaker to the off position.
2. Next remove the housing lid, element wiring and
the element mounting screw. Now pull the element
straight out of the heating tube. NOTE: OCE ele-
ments should only be bent in a vertical plane with
ground strap on the bottom.
3. When removing the heating elements, make certain that
the terminals and the ceramic insulators do not contact
oil or any other liquid foreign matter. Note: Chromalox
cannot be responsible for failures or damage caused
by contamination on the ceramic insulators.
4. Installation is the reverse of the above.
Element Replacement - Hazardous Locations,
Explosion Resistant Housing Only (E2 option)
1. To remove the OCE heating assembly, first turn the
circuit breaker to the off position.
2. Next remove the housing lid, element wiring, and
8mm bolting around the element flamepath module.
If bolts must be replaced, use a minimum of grade
10.9. If needed, (2) 1/4-20x2” bolts may be used to
break loose the module from the flange. Turn bolts
evenly until module is free. The flamepath module will
be re-used, so disconnect the heating element from
the module pins. Now pull the element assembly out
of the heating tube.
NOTE: OCE elements should
only be bent in a vertical plane with ground strap on
the bottom.
3. When removing the heating elements, make certain that
the terminals and the ceramic insulators do not contact
oil or any other liquid foreign matter. Note: Chromalox
cannot be responsible for failures or damage caused
by contamination on the ceramic insulators.
4. Inspect the element assembly flange and mat-
ing surface for any debris, oils, or contamination.
NOTE: Surfaces must be in suitable condition to en-
sure proper hazardous rating.
5. Wire connection to OCE heating element should
be made using ring connectors. Wire connection to
flamepath module must be made with crimp-style
barrel connectors. If wires between flamepath mod-
ule and OCE element need to be replaced, the wires
should be rated for a minimum of 250˚C. It is also
required to cover the barrel connector, wire and ring
connector with electrical sleeving to prevent un-
wanted grounding. Connect the new element to the
flame path module by wiring connection(s) to the
OCE element and slide the OCE element into tube.
6. Connect the new element to the flamepath module
and slide into tube. Flamepath module bolting must
be tightened to 26 ft/lbs. of torque.
7. Reattach element wiring. When reinstalling hous-
ing lid, be sure to properly align gasket, and tighten
housing bolts to 26 ft/lbs.