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OPERATION
1. Do not heat materials that are corrosive to the heating element
sheath or chamber.
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. Consult your
local Chromalox Sales office.
3. If foreign material is carried by the gaseous flow, install suitable
filters in the inlet pipe line to the heater.
4. Do not allow heater to operate when steam, air or gas flow is inter-
rupted.
FIRE/EXPLOSION HAZARD. Safe operating condi-
tions depend on operating pressure, mass velocity
of gas and discharge temperature of the gas. At a
given discharge gas temperature, heater element
sheath temperature and pipe body temperature
tend to increase as gas flow (mass velocity)
decreases. The standard GCH-6 has a 750˚F limita-
tion on the carbon steel body and a 1500˚F limit on
the INCOLOY sheath elements. Check factory if any
doubt exists as to temperatures that will be
encountered in your specific application. At pipe
body temperatures above 750˚F, stainless steel
pipe body is required (model GCHIS).
FIRE/EXPLOSION HAZARD. Do not exceed the
Pressure-Temperature rating of the flange as list-
ed in ANSI B16.5.
WIRING
CONTACTOR
THERMOSTAT
120V, 240V
Figure 7 – GCH6
480V, 3ø
L1
L2
L3
CONTACTOR
THERMOSTAT
120V, 240V
Figure 8 – GCHIS
240V, 3øY
L1
L2
L3
CONTACTOR
THERMOSTAT
120V, 240V
Figure 9 – GCHIS
40V, 3øY
L1
L2
L3
166-075229-014
166-014828-024
166-075229-018
240V LINE
FIGURE A
240V, 3ø (Parallel) Connected
166-075229-014
166-014828-024
480V LINE
FIGURE B
480V, 3ø (Series) Connected
Instructions for converting
GCH6, 240V, 3ø to GCH6, 480V, 3ø
1. Remove all jumper straps and separate
according to different lengths.
2. Discard jumper straps 166-075229-018
(1-1/4” long).
3. Reassemble jumper straps 166-014828-
024 (2-1/2” long) and 166-075229-014
(1-1/2” long) as in Figure B.
4. Replace washers and nuts.
5. Check circuits.
NOTE: Broken Lines Indicate “Customer-furnished”. However, thermostat could have been furnished by chromalox if so specified on order.
MAINTENANCE
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 and serviced by a qualified
person in accordance with the National Electrical
Code, NFPA 70.
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 con-
nections which may have loosened in service. Replace wire and
wire terminals that show signs of oxidation which would interfere
with establishment of reliable electrical connections.
NOTE: Maintenance intervals to be determined by the user based on
their knowledge of the heated medium and operating conditions.