Electric Heated Cabinet Oven for Overseas Electric Motor Paint Drying

This oven was developed for a global industrial procurement and integration partner supporting an overseas deployment of thermal-processing equipment for an electric-motor paint-drying application.

APPLICATION REQUIREMENT

• The equipment was required for drying polyurethane paint on electric motors.
• The customer required a repeatable batch-process platform suitable for industrial finishing work rather than a one-off laboratory unit.
• The project also reflected the need to support a customer relationship with global export reach through a procurement and integration partner.

WORK CHAMBER / LOAD REQUIREMENT

• Required work chamber: 48 in W × 48 in D × 38 in H.
• The oven was supplied with two 100 lb evenly distributed capacity shelves.
• The application also required load flexibility for varying motor sizes and configurations, with shelf loading limited to 100 lb per shelf.
• Customer loading practices had to preserve open airflow passage through the chamber for proper thermal performance.

PROCESS REQUIREMENT

• The system had to support drying of thin polyurethane paint coatings on electric motors.
• Process basis: approximately 0.25 gal of paint per batch.
• Required operating temperature: 482°F (250°C).
• The customer required consistent airflow and temperature control for repeatable batch drying results.

SAFETY REQUIREMENT

• The oven was configured as an NFPA 86 Class A unit.
• The documented maximum VOC load basis was 0.22 gal/batch (o-xylene basis).
• The control enclosure basis was UL 508A Open Industrial Control Panel.

UTILITY / SHIPMENT / EXPORT REQUIREMENT

• Required electrical service: 480V / 3PH / 60Hz.
• The equipment was shipped to for subsequent overseas export.
• Export crating was included as part of the project execution.
• The final operating site was overseas, with the project managed through a global procurement and integration channel rather than a purely domestic end-user installation.

These thermal process requirements were established from the customer’s need to dry thin polyurethane paint coatings on electric motors in a controlled Class A batch oven platform suitable for overseas deployment through a global procurement and integration partner.

TEMPERATURE CAPABILITY

• Operating temperature: 482°F (250°C)
• Maximum temperature: 550°F (288°C)
• Required work-area uniformity: ±10°F

PROCESS BASIS

• The thermal process basis was drying thin polyurethane paint on electric motors.
• Process basis: approximately 0.25 gal of paint per batch.
• The application required repeatable temperature exposure and airflow across varying motor sizes while maintaining proper open airflow paths through the load.

HEAT INPUT REQUIREMENT

• Heat source: electric resistance heat
• Heater bank: 24 elements × 1500 W
• Total installed heat: 36 kW

AIRFLOW DELIVERY REQUIREMENTS

• Airflow style: full horizontal airflow
• Recirculation airflow basis: 1,500 CFM
• Recirculation static pressure basis: 2 in. W.c.
• Recirculation fan motor: 1.5 HP

EXHAUST / VENTILATION BASIS

• Exhaust fan: PQ1 exhauster
• Exhaust airflow: 300 CFM
• Exhaust static pressure: 1 in. W.c.
• Exhaust fan motor: 0.75 HP

THERMAL INSTRUMENTATION / CONTROL BASIS

• Primary controller: SSI-804 temperature controller
• Work-area thermocouple: Type J
• Excess temperature controller: Gefran 650L high-limit arrangement

SAFETY / CLASSIFICATION BASIS

• Oven classification basis: NFPA 86 Class A
• Maximum VOC load basis: 0.22 gal/batch (o-xylene basis)
• Purge timer basis: 3 minutes minimum
• Airflow switches were used on both exhaust and recirculation fans as part of the safe-operating sequence

To deliver the customer and thermal process requirements for this oven, Precision Quincy developed the following equipment concept and architecture.

OVERALL CONCEPT

• One 40C-550 Class A electric cabinet oven
• Designed for drying thin polyurethane paint on electric motors
• Developed for a global industrial procurement and integration partner supporting an overseas deployment
• Configured as a full-horizontal-airflow batch oven for repeatable drying performance

HEATING ARCHITECTURE

• Heat source: electric resistance heat
• Heater bank output: 36 kW total
• Heater bank arranged as 24 × 1500 W heating elements
• Heat controlled through solid-state relay architecture with a back-up contactor

AIRFLOW / RECIRCULATION ARCHITECTURE

• Airflow pattern: full horizontal airflow
• Recirculation fan concept:
• 1,500 CFM
• 2 in. W.c.
• 1.5 HP motor
• Exhaust fan concept:
• PQ1 exhauster
• 300 CFM at 1 in. W.c.
• 0.75 HP motor
• The chamber and load concept required maintaining open airflow paths around the product for proper process performance

CHAMBER / CONSTRUCTION ARCHITECTURE

• Internal work chamber: 48 in W × 48 in D × 38 in H
• Wall thickness: 4 in
• Insulation: 4 in of 6 lb mineral wool
• Interior material: unpainted aluminized steel
• Exterior finish: PQ Blue
• Control panel finish: ANSI 61 gray
• Floor: 3/16 in plate floor

DOOR / ACCESS ARCHITECTURE

• Two swing doors
• Supplied with two 100 lb evenly distributed capacity shelves
• Shelf spacing shown at 3 in adjustable increments
• The shelf and chamber arrangement supported load flexibility for varying electric-motor sizes and configurations, with 100 lb maximum per shelf

CONTROLS ARCHITECTURE

• NEMA 1 control enclosure
• Primary temperature controller: SSI-804
• Excess temperature controller: Gefran 650L
• Work-area thermocouples: Type J
• Control enclosure listed to UL 508A Open Industrial Control Panel

SAFETY / COMPLIANCE ARCHITECTURE

• Oven classification basis: NFPA 86 Class A
• Applicable standards basis: NFPA 79, NFPA 86, UL 508A
• Included Class A exhaust, purge timer, airflow switches on exhaust and recirculation fans, and overtemperature protection
• Maximum VOC load basis: 0.22 gal/batch (o-xylene basis)

SHIPPING / INSTALLATION ARCHITECTURE

• The oven was shipped to for subsequent overseas export
• Export crating was included as part of the project execution
• The project reflects Precision Quincy’s ability to support equipment delivery through a global procurement and integration channel