מדריך למשתמש של בקרת הפשרה MR4PMUHV-12C של Johnson Controls

1. הקדמה

The Johnson Controls MR4PMUHV-12C Defrost Control is engineered for use in refrigeration and freezer units, supporting both hot gas and electric heat defrost methods. This control unit offers flexible defrost termination options, allowing selection between time-based or temperature-based methods. It integrates essential control functions including compressor management, defrost cycle management, fan operation control, and alarm management, providing a comprehensive solution for HVAC systems.

איור 1: Johnson Controls MR4PMUHV-12C Defrost Control unit and included temperature sensors. The central gray unit features a digital display and control buttons, while two coiled gray cables with metallic tips represent the temperature sensors.

2. מה בקופסה

• Johnson Controls MR4PMUHV-12C Defrost Control Unit
• Temperature Sensors (2 units)

3. תכונות עיקריות

• Integrated Functionality: Combines multiple control functions into a single unit, offering a cost-effective solution.
• הרכבה גמישה: The control unit and relay pack can be mounted together or separately to suit various installation requirements.
• חישת טמפרטורה מדויקת: Utilizes interchangeable temperature sensors for reliable performance, supporting wiring up to 300 ft. with offset compensation for longer runs.
• Clear Temperature Display: An easily readable display shows either evaporator or process temperature at the press of a button.
• Heavy-Duty Relays: Equipped with robust relays for direct control of compressors, fans, defrost heaters, and alarm systems.

4. התקנה והתקנה

Proper installation is crucial for the safe and efficient operation of the defrost control. Always ensure power is disconnected before beginning any installation or wiring procedures.

1. בטיחות ראשונה: Disconnect all power to the refrigeration or freezer unit before proceeding. Follow all local electrical codes and safety guidelines.
2. הַרכָּבָה: Select a suitable location for mounting the control unit and, if applicable, the separate relay pack. Ensure adequate ventilation and protection from moisture. The flexible design allows for combined or separate mounting.
3. חיבורי חיווט:
   • Connect the 24VAC power supply to the designated terminals on the control unit.
   • Wire the compressor, fans, and defrost heaters to the heavy-duty relay terminals as per the wiring diagram provided with the product.
   • Connect any external alarm systems to the dedicated alarm terminals.
4. התקנת חיישן: Install the temperature sensors in the appropriate locations within the evaporator or process area as required for accurate temperature monitoring. Ensure sensor cables are routed safely and securely.
5. הפעלה ראשונית: Once all connections are secure and verified, restore power to the unit. The control unit display should illuminate.

5. תפעול

After successful installation, the MR4PMUHV-12C is ready for configuration and operation.

1. תצוגה מעלview: Upon power-up, the digital display will show the current temperature. Pressing the designated button (refer to product-specific labeling) allows toggling between evaporator and process temperature readings.
2. Setting Defrost Parameters: Access the control unit's menu (typically via dedicated buttons) to configure defrost settings. This includes:
   • מרווח הפשרה: Set the frequency at which defrost cycles occur.
   • Defrost Duration: Specify the maximum time for a defrost cycle.
   • Defrost Termination Method: Choose between time-based termination (defrost ends after a set duration) or temperature-based termination (defrost ends when a specific temperature is reached).
   • Fan Delay: Configure any fan delay settings post-defrost.
3. הגדרות אזעקה: Configure temperature thresholds for alarms to ensure optimal operating conditions and prompt notification of deviations.
4. ניטור: Regularly check the display for current temperatures and system status.

6. תחזוקה

Routine maintenance helps ensure the longevity and reliable performance of your defrost control unit.

• ניקוי: יש לנקות מעת לעת את החלק החיצוני של יחידת הבקרה בעזרת מטלית רכה ויבשה. יש להימנע משימוש בחומרי ניקוי שוחקים או ממסים.
• בדיקת חיווט: Annually inspect all wiring connections for tightness and signs of wear or corrosion. Ensure all connections are secure.
• בדיקת חיישן: Verify that temperature sensors are securely in place and free from damage. Ensure their placement continues to provide accurate readings.
• מבחן פונקציונליות: Periodically observe the defrost cycles to confirm they are initiating and terminating correctly according to programmed settings.

7. פתרון תקלות

סעיף זה מספק הדרכה לבעיות נפוצות. במקרה של בעיות מורכבות, פנו לאנשי שירות מוסמכים.

• היחידה לא מופעלת:
  • Check the 24VAC power supply connection.
  • Verify that the circuit breaker or fuse supplying power to the unit is not tripped or blown.
• קריאות טמפרטורה שגויות:
  • Ensure temperature sensors are correctly installed and not damaged.
  • Check sensor wiring for loose connections or breaks.
  • Verify sensor calibration if possible (refer to advanced settings).
• Defrost Cycle Not Initiating/Terminating:
  • Review defrost interval and duration settings in the control unit's menu.
  • Confirm the selected defrost termination method (time or temperature) is appropriate for the application.
  • Check wiring to defrost heaters or hot gas valve.
• Alarms Activating Unexpectedly:
  • Verify alarm setpoints are correctly configured.
  • Check for actual temperature deviations that might be triggering the alarm.

8. מפרטים

9. אחריות ותמיכה

For information regarding product warranty, technical support, or service, please contact Johnson Controls directly or refer to the official documentation included with your purchase. Keep your proof of purchase for warranty claims.

פרטי קשר של ג'ונסון קונטרולס: אנא בקרו באתר הרשמי של ג'ונסון קונטרולס webאתר לקבלת פרטי הקשר ומשאבי התמיכה העדכניים ביותר.