1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the Intermatic DTAV40 Defrost Timer. This device is designed to control defrost cycles in refrigeration systems, ensuring efficient operation and preventing ice buildup.
The DTAV40 is a robust and reliable timer suitable for various commercial and industrial refrigeration applications. Please read this manual thoroughly before installation and use to ensure proper function and safety.
Image 1.1: The Intermatic DTAV40 Defrost Timer, enclosed in a durable gray plastic housing. The timer face is visible, along with green and red indicator lights for refrigeration and defrost status.
2. Safety Information
WARNING: Risk of electric shock. Installation and servicing should only be performed by qualified personnel. Disconnect power before installing or servicing this device.
- Always follow local electrical codes and regulations.
- Ensure the power supply matches the timer's voltage rating (120/240V AC).
- Do not exceed the maximum current rating of 40A.
- Verify all connections are secure and properly insulated.
- This device is intended for permanent installation.
Image 2.1: UL Listed certification logo, indicating compliance with safety standards.
3. Product Features
The Intermatic DTAV40 Defrost Timer offers the following key features:
- Voltage: 120/240V AC
- Amperage: 40 A
- Contact Type: 1 Normally Open (NO) / 1 Normally Closed (NC)
- Max. On/Off Cycles: Up to 48 per day
- Defrost Time Range: 15 to 1425 minutes
- Enclosure Material: Durable Plastic
- Termination Type: Temperature or Pressure, Time, Defrost Initiation Time
- Application: Designed for commercial refrigeration defrost control.
4. Installation
4.1 Mounting
- Choose a suitable location for mounting the timer, ensuring it is protected from direct weather exposure and excessive vibration.
- Mount the timer securely using appropriate fasteners through the mounting holes provided on the enclosure.
4.2 Wiring
Refer to the wiring diagram provided inside the timer's enclosure. Ensure all wiring is performed by a qualified electrician in accordance with national and local electrical codes.
- Power Supply: Connect the incoming 120/240V AC power to the designated terminals.
- Load Connections: Connect the refrigeration compressor and defrost heater circuits to the appropriate NO/NC contacts as per your system's requirements.
- Grounding: Ensure the timer is properly grounded.
After wiring, replace the insulating panel before restoring power to the unit.
Image 4.1: Internal view of the DTAV40 timer, showing the clock mechanism, terminals, and indicator lights. This view is for reference during wiring.
5. Operating Instructions
5.1 Setting the Time of Day
- Rotate the dial clockwise until the current time of day aligns with the pointer on the timer face.
- Ensure the AM/PM indication is correct.
5.2 Setting Defrost Cycles
The timer allows for up to 48 defrost cycles per day. Defrost pins are typically colored differently (e.g., red for defrost, green for refrigeration).
- Insert the defrost pins into the desired time slots on the dial where defrost is required. Each pin represents a specific duration or start time.
- Adjust the defrost duration setting (if applicable to your model) to set the length of each defrost cycle (15 to 1425 minutes).
5.3 Indicator Lights
- Green Light: Indicates the refrigeration cycle is active.
- Red Light: Indicates the defrost cycle is active.
6. Maintenance
The Intermatic DTAV40 Defrost Timer is designed for minimal maintenance. However, periodic checks are recommended:
- Visual Inspection: Periodically inspect the timer for any signs of physical damage, loose connections, or corrosion.
- Cleaning: Keep the enclosure clean and free from dust and debris. Use a dry cloth for cleaning. Do not use abrasive cleaners or solvents.
- Functionality Check: Verify that the defrost cycles are initiating and terminating at the programmed times.
Note: Always disconnect power before performing any maintenance or inspection.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Timer not operating | No power supply Loose wiring Internal fault | Check circuit breaker/fuse Verify all wire connections Contact qualified service personnel |
| Defrost cycle not initiating | Incorrect pin placement Defrost duration not set Faulty defrost heater | Ensure defrost pins are correctly inserted Adjust defrost duration setting Inspect defrost heater and associated wiring |
| Defrost cycle too long/short | Incorrect defrost duration setting | Adjust the defrost duration setting as needed |
| Indicator lights not working | Bulb failure Internal wiring issue | Lights are typically sealed; if functionality is fine, this may be cosmetic. If not, contact service. |
8. Specifications
- Model: DTAV40
- Voltage: 120/240V AC
- Amperage: 40 A
- Contact Configuration: 1 NO, 1 NC
- Max. On/Off Cycles: 48 per day
- Defrost Time: 15 to 1425 minutes
- Enclosure Material: Plastic
- Product Dimensions: 21"D x 18"W x 21"H (Note: These dimensions seem unusually large for a timer and may refer to package dimensions. Refer to product documentation for exact unit dimensions.)
- Item Weight: 1.9 Pounds
- Operating Temperature: Consult manufacturer's official documentation.
- Certifications: UL Listed
9. Warranty and Support
For detailed warranty information, please refer to the official manufacturer's documentation included with your product or visit the Intermatic website. The warranty typically covers defects in materials and workmanship for a specified period from the date of purchase.
For technical support, service, or replacement parts, please contact Intermatic customer service directly. Contact information can be found on the Intermatic website or in the packaging materials.
Manufacturer: Intermatic Incorporated
