Durex industries DFX 550 Руководство по установке и эксплуатации - Страница 3

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WARNING!

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.