Durex industries DFX 250 Manual de instalación y funcionamiento - Página 3
Navegue en línea o descargue pdf Manual de instalación y funcionamiento para Calentador Durex industries DFX 250. Durex industries DFX 250 4 páginas.
Imprimir páginaWARNING!
ELECTRIC SHOCK HAZARD. Disconnect power prior
to making (or servicing) wire, cable and conduit con-
nections. Failure to do so may cause personal injury or
equipment damage. Only qualified electricians should
install wiring, and ensure proper grounding, in accor-
dance with the NEC, NFPA 70 and other local codes.
EXPLOSION & FIRE HAZARD. For classified hazard-
ous locations, user must verify that the properly rated
enclosure is being employed and is responsible for
proper field connections as required by NEC, NFPA70
and other local codes.
EXPLOSION & FIRE HAZARD. A high limit safety de-
vice (preferably FM Approved or similar rating) such as
high limit temperature controller, temperature switch
or other redundant control MUST be used to prevent a
potentially dangerous heater over-temperature condi-
tion. This condition could lead to personal injury and
equipment damage.
1. It is the user's responsibility to properly size and install
proper feed wire and protective conduit. Due to potentially
WARNING!
EXPLOSION & FIRE HAZARD. Do not operate the
heater at pressures higher than for which it is rated.
Also, do not heat materials that are corrosive to the flow
tubing. The flow tube may rupture potentially causing
personal injury or equipment damage.
WARNING!
ELECTRIC SHOCK HAZARD. Disconnect power prior
to servicing wire, cable and conduit connections. Fail-
ure to do so may cause personal injury or equipment
damage. Only qualified electricians should service wir-
ing, and ensure proper grounding, in accordance with
the NEC, NFPA 70 and other local codes.
1. Periodically check high limit functionality as well as tempera-
ture control.
190 Detroit Street, Cary, Illinois 60013 • Phone: 847-639-5600 • Fax: 847-639-2199 • Web: www.durexindustries.com • TOLL FREE: 800-762-3468
DFX Cast Circulation Heater
Installation & Operation Manual
WIRING
high operating temperatures, use minimum 250°C (480°F) rated
power feed wire. Apply appropriate ampacity de-rate factors
to the wire based on expected enclosure operating temperature
conditions. Feeder wire should also be housed in properly
sized and rated conduit.
2. Consult wiring diagrams for wiring connection guidance.
Consult factory if anything is unclear.
3. After heater is wired, check tightness on each terminal by
supporting lower hex nut and tightening upper hex nut to a
maximum torque of 20 in-lb (2.25 N-m). Over tightening will
lead to termination breakage and render heater inoperable!
4. Use copper connector lugs to land power supply wiring (not
applicable to DFX 250). Refer to wiring diagrams for assistance.
5. Ensure that process temperature controllers, high limit con-
trollers and thermocouple(s) are properly wired and connected.
Ensure that the power switching device (relay or SSR) is prop-
erly rated for voltage and current requirements.
6. If using a thermostat, ensure that it is properly wired and
connected. If the thermostat is used as pilot duty, verify proper
wiring to user supplied contactors and field wiring.
7. Thermostats and temperature controllers should not be used
to "power off" or disconnect power to the the heater. Use of
a disconnect switch or circuit breaker is required to interrupt
power supply to the heater and electrical connections.
OPERATION
1. Establish fluid flow. If a liquid, it is preferable to bleed the
air out of the lines if possible.
2. Energize the heater and control system. Set proper tempera-
ture and process parameters. Make sure the system is working
properly before leaving it unattended.
3. Do not allow heater to operate if flow is interrupted or allow
pressure to build up in access of pressure ratings.
MAINTENANCE
2. Periodically, check electrical connections and retighten those
that may have loosened in service. Replace wires and connec-
tion hardware that appear to be oxidized and which would
interfere with electrical conduction.
3. Periodically disconnect the process flow tube and visually
inspect to ensure no build up or corrosion of the flow tube.
4. If a moisture resistant enclosure, check the gasket condition
and replace if needed.
5. NOTE: Maintenance intervals are to be established by the
user.
3