WIRING

Note: All wiring should be done in accordance with local codes and the National Electrical Code by a qualified person.

WARNING: Hazard of Electric Shock. Any installation involving electric heaters must be effectively grounded in accordance with the National Electrical Code to eliminate shock hazard.

1.Connect heater according to the voltage and frequency speci- fied on the nameplate and using the appropriate wiring diagram (Figures 3 thru 8).

Note: Be sure to check voltage rating of the fan motor which is either 120, 208 or 240 volt, single phase since heater circuit could be 480 volts, single or three phase.

2.If a transformer is used to step down the voltage for operating the fan motor, use appropriate wiring diagram (Figures 5 or 7).

3.Heaters are not provided with a control switch and should be controlled by a magnetic contactor (integral or external) and a separately mounted thermostat. External contactor is not nec- essary with heaters having a model number suffixed with the letter “R”.

4.Protection against overheating is provided by an internal auto- matic thermal cutout which opens the electric circuit if the nor- mal air-flow is restricted or stopped. Cutout automatically energizes heater on removal of the obstruction.

WARNING: Users should install adequate back-up controls and safety devices with their electric heat- ing equipment. Where the consequences of failure may be severe, back-up controls are essential. Although the safety of installation is the responsi- bility of the user, Chromalox will be glad to make equipment recommendations.

OPERATION

DANGER:

1.Do not restrict air-flow through the heater by placing fabric or other obstructions in front of or behind the heaters. With some combustible materials, the resulting high discharge tempera- tures could cause a fire.

2.This heater is not intended for use in hazardous atmospheres where flammable vapors, gases, liq- uids or other combustible atmospheres are present as defined in the National Electrical Code. Failure to comply can result in explosion or fire. For these applications see Bulletin PDS CXH-EP PF305.

MAINTENANCE

WARNING: Turn off all power to service heater. Do not attempt to service heater while unit is operating as there is hazard of electric shock, injury from operat- ing fan, and burns from hot heating elements.

1.Fan motors in these heaters are provided with sealed ball bear- ings, factory lubricated, requiring no further lubrication under normal service conditions.

2.Following long periods of idleness, heater should be vacu- umed before start-up, to remove accumulated combustible par- ticles which otherwise may smoke or incinerate on initial heat up.

3.Periodically inspect all electrical connections and terminals to avoid electrical wiring difficulties. Inspect all wiring for frayed or worn insulation.

WIRING DIAGRAMS

Figure 3

Use with:

UB-502D

120V, 1Ø 208V, 1Ø or 3Ø 240V, 1Ø or 3Ø

UB-752D

208V, 3Ø

Control Source for

Separately Wired Motors 120 or 240 Volts, 60 Cycle

Fused

Fused

Switch

Switch

 

Contactor

 

When Heater and

}1 or 3 Phase 60 Hz Power Supply 120, 208 or 240 Volts

Heater

Ground

Heater Bank

1Ø Motor

Wiring Comp't

Baffle

240V, 3Ø

Motor Voltage are similar

Thermostat When Used

This Wiring

by Customer

F1

F2

For 3 Phase Only

L1

L2

L3

Figure 4

Use with:

UB-502D & UB-752D 480V, 1Ø or 3Ø

UB-752D

208V, 1Ø 208V, 1Ø

Control Source for

Separately Wired Motors 120 or 240 Volts, 60 Cycle

Fused

Fused

Control Switch

Switch

 

Contactor

}1 or 3 Phase 60 Hz Power Supply 208, 240 or 480 Volts

Heater

Ground

1Ø Motor

Heater Bank

 

Cutout

 

Wiring Comp't

 

Baffle

 

This Wiring

 

by Customer

 

F1

 

F2

 

T1

Thermostat When Used

L1

L2

 

 

L3

For 3 Phase Only

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Chromalox UB-502D, UB-752D specifications Operation, Maintenance, Wiring Diagrams

UB-752D, UB-502D specifications

The Chromalox UB-502D and UB-752D are advanced electronic temperature control units designed for precise temperature management in various industrial applications. These units excel in providing reliable and efficient heating solutions, making them suitable for diverse environments such as manufacturing facilities, laboratories, and testing centers.

One of the standout features of the UB-502D and UB-752D is their dual-output capability, rendering them capable of controlling two separate heating zones independently. This is particularly advantageous in processes requiring different temperature settings, allowing for greater flexibility and efficiency in operations. Each unit is equipped with a digital display and user-friendly interface, facilitating easy navigation and real-time monitoring of temperature settings.

The UB-502D and UB-752D utilize advanced PID (Proportional-Integral-Derivative) control technology. This sophisticated control algorithm continuously adjusts the heating output, ensuring temperatures remain stable and within the desired range. This level of precision enhances process reliability and contributes to improved product quality, which is essential in industries where temperature control is critical.

Both models incorporate a wide temperature control range, making them suitable for various applications. The UB-502D can regulate temperatures up to 500°F, while the UB-752D extends this capability to 750°F, catering to high-temperature requirements. This versatility allows them to accommodate a range of heating applications, from material processing to equipment heating.

Another significant aspect is the robust construction of these units, designed to withstand harsh industrial conditions. The durable housing not only ensures longevity but also contributes to safety, safeguarding against potential hazards associated with overheating or equipment failures. Moreover, the units are designed with built-in safety features like over-temperature protection and alarms, providing an extra layer of security in operational settings.

The Chromalox UB-502D and UB-752D also offer options for remote monitoring and control, allowing operators to manage temperature settings from a distance. This connectivity is increasingly important in modern industrial environments where real-time data and remote access can enhance operational efficiency and responsiveness.

In conclusion, the Chromalox UB-502D and UB-752D are state-of-the-art electronic temperature control units that combine precision, flexibility, and safety. Their advanced technologies, robust design, and user-friendly interfaces make them indispensable tools for any industrial application requiring reliable temperature management. Whether for manufacturing processes or laboratory experiments, these units set a standard for performance and efficiency in temperature control solutions.