1. Introduction
The Jiubei CT8893D and CT8893B are advanced temperature controllers designed for precise management of cold dryers, refrigerated dryers, and air compressor systems. These controllers offer a comprehensive suite of functions including accurate temperature display, adjustable temperature control (cooling/heating modes), compressor startup delay protection, and multiple defrosting options. They are engineered to ensure optimal performance and energy efficiency in industrial refrigeration and air treatment applications.
2. Specifications
The following table details the technical specifications for the CT8893D/CT8893B controllers:
| Feature | Specification |
|---|---|
| Model | CT8893D, CT8893B |
| Temperature Range | -50~150 ℃ (resolution 1 ℃) / -58~302 ℉ (resolution 0.1 ℉) |
| Power Supply Voltage | 220V ± 10% or 380V ± 10% (refer to product label) |
| Usage Environment Temperature | -10 ℃ ~ 50 ℃ |
| Usage Environment Humidity | ≤ 85% (non-condensing) |
| Compressor Output Contact Capacity | 20A/250VAC (pure resistive load) |
| Defrosting Output Contact Capacity | 8A/250VAC (pure resistive load) |
| Temperature Sensor | NTC R25=5kΩ, B(25/50)=3470K |
| DIY Supplies Category | Electrical |
| Certification | CE |
| Warranty | 1 Year |
| Material | Plastic |
| Origin | Mainland China, Guangdong |
3. Product Features
The CT8893D/CT8893B controller offers a robust set of features for comprehensive temperature management:
- Temperature Display: Clear digital display of current temperature.
- Temperature Control: Adjustable cooling/heating modes to suit various applications.
- Compressor Startup Delay Protection: Protects the compressor from frequent starts, extending its lifespan.
- Dual Defrosting Modes: Supports both electric and hot defrosting methods.
- Flexible Defrosting Start Modes: Initiates defrosting based on time interval or cumulative compressor operation time.
- Dual Defrosting End Modes: Defrosting can be terminated by timing or temperature, ensuring efficient defrosting.
- Defrosting Drip: Manages drip time after defrosting to prevent ice buildup.
- Manual Defrosting: Allows for manual initiation of defrost cycles.
- Sensor Abnormal Alarm: Alerts users to issues with temperature sensors.
- External Alarm Signal Input: Can receive and respond to external alarm signals.
- Password Protection: Secures settings from unauthorized changes.
- Fahrenheit/Celsius Conversion: User-selectable temperature units.
4. Setup & Installation
4.1 Safety Precautions
- Ensure all power is disconnected before installation or wiring to prevent electric shock.
- Installation should be performed by qualified personnel in accordance with local electrical codes.
- Verify the power supply voltage matches the controller's requirements (220V AC or 380V AC as per product label).
- Avoid installing the controller in environments with excessive vibration, moisture, or corrosive gases.
4.2 Mounting
The controller is designed for panel mounting. Cut an appropriate opening in the control panel and secure the controller using the provided clips or fasteners. Ensure adequate space for wiring at the rear of the unit.
4.3 Wiring Diagram
Refer to the wiring diagram below for proper connection of the temperature sensors, compressor, fan, and power supply. Ensure all connections are secure and correctly terminated.
Terminal Connections:
- Terminals 1 & 2 (T1): Connect to the Dew Point Temperature Sensor (NTC type).
- Terminals 3 & 4 (T2): Connect to the Condensation Temperature Sensor (NTC type).
- Terminals 5 & 6 (S1): Connect to the External Alarm Signal input.
- Terminals 7 & 8 (Comp): Connect to the Compressor load (Output contact capacity: 20A/250VAC).
- Terminals 9 & 10 (Fan): Connect to the Fan load (Output contact capacity: 8A/250VAC).
- Terminals 11 & 12 (N, L): Connect to the 220V AC power supply.
Ensure that the NTC temperature sensors (R25=5kΩ, B(25/50)=3470K) are correctly installed in their respective locations within the dryer or compressor system for accurate readings.
5. Operating Instructions
The CT8893D/CT8893B controller features a digital display and intuitive buttons for operation:
5.1 Display and Buttons
- Digital Display: Shows the current temperature, set points, and alarm codes.
- Up/Down Arrows: Used to navigate menus, adjust set values, and switch between Fahrenheit/Celsius.
- 'M' (Mode) Button: Typically used to enter/exit menu modes or confirm selections.
- 'Set' Button: Used to confirm settings or access parameters.
5.2 Setting Temperature Control
To set the desired temperature, typically press the 'Set' button to enter the set point adjustment mode. Use the Up/Down arrows to change the value, then press 'Set' or 'M' to confirm. The controller supports both cooling and heating modes, which can be configured in the advanced settings.
5.3 Defrosting Settings
The controller allows for detailed configuration of defrosting cycles:
- Mode Selection: Choose between electric or hot gas defrosting.
- Start Conditions: Set defrosting to start after a specific time interval or after a cumulative compressor run time.
- End Conditions: Configure defrosting to end based on a set duration or when a specific temperature is reached (dual control).
- Drip Time: Adjust the post-defrosting drip time to allow water to drain.
- Manual Defrost: Consult the full manual for specific button sequences to initiate a manual defrost cycle.
5.4 Fahrenheit/Celsius Conversion
The unit of temperature display can be switched between Fahrenheit (℉) and Celsius (℃) through the settings menu, typically by holding down a combination of arrow keys or accessing a specific parameter.
6. Maintenance
Regular maintenance ensures the longevity and reliable operation of your CT8893D/CT8893B controller:
- Cleaning: Periodically wipe the controller's surface and display with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Connection Checks: Annually inspect all wiring connections to the controller to ensure they are tight and free from corrosion. Loose connections can lead to erratic behavior or failure.
- Sensor Inspection: Check the temperature sensors (T1, T2) for physical damage or buildup that might affect their accuracy. Ensure they are securely mounted.
- Environmental Conditions: Confirm that the operating environment remains within the specified temperature and humidity ranges to prevent damage to internal components.
While this manual focuses on the controller, remember that the associated air compressor and dryer components (e.g., air filters, oil filters, oil separators, lubricating oil) also require regular maintenance as per their respective manuals to ensure the overall system's efficiency and performance.
7. Troubleshooting
This section provides guidance on common issues you might encounter with your controller:
| Problem | Possible Cause | Solution |
|---|---|---|
| Controller display is off | No power supply; loose wiring connection | Check power input (Terminals 11-12); verify all power connections are secure. |
| "Sensor Abnormal" alarm | Faulty temperature sensor (T1 or T2); loose sensor connection | Check sensor wiring (Terminals 1-2 for T1, 3-4 for T2); replace sensor if faulty. |
| Incorrect temperature reading | Sensor misplacement; sensor calibration issue | Ensure sensors are correctly positioned; check sensor specifications and replace if necessary. |
| Compressor/Fan not activating | Incorrect temperature set point; wiring issue; compressor delay protection active | Verify set temperature and operating mode; check wiring to compressor/fan (Terminals 7-8, 9-10); wait for delay protection to clear. |
| Defrosting not working | Incorrect defrost settings; defrost heater/fan fault | Review defrost mode, start, and end settings; check external defrosting components. |
For persistent issues or complex problems, contact technical support.
8. User Tips
- Optimal Sensor Placement: Ensure temperature sensors are placed in locations that accurately reflect the conditions you wish to control, away from direct airflow or heat sources that could skew readings.
- Regular Monitoring: Periodically check the display to ensure the system is operating within desired parameters and to catch any anomalies early.
- Parameter Backup: If possible, record your controller's settings, especially after initial setup and any adjustments, for quick reference or restoration.
- Environmental Control: Maintain a stable environment around the controller itself, avoiding extreme temperatures or humidity, to ensure its reliable performance.
9. Warranty & Support
The Jiubei CT8893D/CT8893B Cold Dryer Temperature Controller comes with a 1-year warranty from the date of purchase, covering manufacturing defects and malfunctions under normal operating conditions.
For technical assistance, troubleshooting beyond this manual, or warranty claims, please contact your supplier or the manufacturer's customer support. When contacting support, please have your product model (CT8893D or CT8893B) and a detailed description of the issue ready.