Chromalox PM400-2 - Manual (Page 2)

INSTALLATION
WARNING: Hazard of Electric Shock. Disconnect all
power before installing heater.
1. Position slots in clamping band over terminal posts on heating
elements. Note: Terminal hardware must be removed to allow
clamping band slots to fit over terminal posts (Figure 1).
2. When heater band is correctly placed in the desired location,
compress ends of band together and insert bolt through non-
threaded trunnion socket and then into opposite threaded sock-
et. Hand tighten (Figure 2).
3. Turn Allen head bolt with 7/32” Allen wrench to draw heater
band tight on cylinder. Ensure that there is good contact
between heating element and cylinder and that there is electri-
cal clearance between the heater terminals and the clamping
band (Figure 1).
4. DANGER: Hazard of Fire. Since these heaters are capa-
ble of developing high temperatures, extreme care should be
taken to:
A. Avoid installing heaters in an atmosphere containing com-
bustible gases and vapor.
B. Avoid contact between heater and combustible material.
C. Keep combustible materials far enough away to be free of
effects of high temperature.
Figure 1 Figure 2 Figure 3
WIRING
WARNING: Hazard of Electric Shock. Any installation
involving electric heaters must be effectively ground-
ed in accordance with the National Electical Code to
eliminate shock hazard.
1. Rough-in Wiring — Wiring to heater should be to the volt-
age specified on heater band and in accordance with local and
National Electrical codes by a qualified person. As a guide in
determining line wire sizes see Amperes in Specifications
Table A on page 1. WARNING: Use copper conduc-
tors only.
2. Assemble terminal hardware and wiring in the order shown in
Figure 5.
3. Protection with proper size fuses and breakers is important to
minimize hazards.
WARNING: Do not exceed 25 inch pounds of torque
when tightening the hex nuts on the heater termi-
nals. Excessive torque will result in stripping the
terminals from the refractory of the heating ele-
ment.
4. For rated output for heater band, connect heating elements in
parallel. 240V elements to be run on 480V should be connect-
ed in series. When element wattages are not equal, heaters
must not be connected in series.
TESTING
DANGER: Hazard of Electric Shock or Burns. Avoid
contact of hot surfaces and live electrical terminals
during this adjustment.
1. Energize the heater and check for hot spots after the heater has
reached operating temperature. These can be identified as
bright red areas on the heating element or dark brown areas on
the clamping band. If hot spots are encountered, place a wood-
en block on the affected area and tap lightly with a hammer to
bring the heater in contact with the pipe or barrel surface.
2. It’s good practice to check the tightness of the clamping
band after a few hours at operation temperature. Chromalox
HTRC (Heat Trans-fer and Release Coating) is also available
for high temperature applications.
Figure 4
MAINTENANCE
WARNING: Hazard of Severe Shock. Disconnect all
power to heater before servicing or replacing
heaters.
1. For longer heater life, maintain good contact between heater
and work cylinder by periodically checking clamping band
tightness.
2. Make certain that both terminals and band are free from con-
tact with oil, liquids or other foreign matter. Such contaminants
can cause heater failures.
3. Check for loose terminal connections and tighten if necessary.