1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the Sanhua Electronic Expansion Valve Controller and Solenoid Valve Driver, including models SEC611-R4, SEC612-R4, SEC611-R7, and SEC612-R7. These controllers are designed for precise regulation in various refrigeration and air conditioning systems, ensuring optimal performance and energy efficiency.
2. Specifications
2.1 General Specifications
- Applicable Refrigerants: Various refrigerants
- Operating Temperature: -10°C to 50°C
- Storage Temperature: -20°C to 60°C
- Relative Humidity: ≤90%RH
- Certification: CE Declaration according to EMC
- Installation Method: DIN rail snap-in or wall mounting with screws
- Origin: Mainland China
- Type: Actuator
2.2 Electrical Parameters
- Power Supply: 24Vac/24Vdc (+10%/-15%, 50/60Hz)
- Requested Transformer: ≥ 30VA
2.3 Inputs and Outputs
- Inputs:
- 1 x Pressure sensor input
- 1 x Temperature sensor input
- 1 x Communication input (RS485 Modbus)
- Outputs:
- 1 x Auxiliary relay output (30Vdc/5A)
- 1 x EEV output (12V DC±10%), rectangular wave
2.4 Available Models
- SEC611-R4 0.5-3.5V
- SEC612-R4 4-20MA
- SEC611-R7
- SEC612-R7
- SEC611-R4 set
- SEC612-R4 set
- SEC611-R7 set
- SEC612-R7 set
- SEC612-R4 high
- NTC2A1 (Temperature Sensor)
- YCQB02L12 2M (Sensor)
- YCQB02H01 2M (Sensor)
- YCQC02L18 1-12bar (Sensor)
- YCQC03l05 0-30bar (Sensor)
3. Setup and Installation
3.1 Mounting the Controller
The controller can be installed using either a DIN rail snap-in mechanism or by wall mounting with screws. Ensure the mounting location is free from excessive vibration, moisture, and extreme temperatures, within the specified operating range of -10°C to 50°C.
3.2 Wiring Connections
Refer to the following table and wiring diagram for proper electrical connections. All wiring should be performed by a qualified technician, adhering to local electrical codes and safety standards. Ensure the power supply is 24Vac/24Vdc and the transformer is rated for at least 30VA.
| NO. | Function | Description |
|---|---|---|
| J1.1 | AC/DC 24V | +24V Power Input AC24V or DC24V+ |
| J1.2 | ||
| J1.3 | -24V Power Input AC24V or DC24V- | |
| J1.4 | ||
| J2.1 | RUN | SIG Run / Stop signal Input |
| J2.2 | GND Signal common | |
| J3.1 | RS485 | TRX+RS485 comm. TRX+(A) |
| J3.2 | TRX-RS485 comm. TRX-(B) | |
| J4.1 | AUX-RLY | N.O Auxiliary relay - Normal Open contact |
| J4.2 | COM Auxiliary relay - common | |
| J4.3 | N.C Auxiliary relay - Normal Close contact | |
| J5.1 | P-SENS | Power: YCQB: +5V (red) YCQC: 10-30Vdc |
| J5.2 | S1 YCQB: 0.5-3.5V (white) YCQC: 4-20mA | |
| J5.3 | GND (black) YCQC: N/A | |
| J5.4 | ||
| J6.1 | T-SENS | S2 Temperature sensor |
| J6.2 | GND Temperature sensor common | |
| J7.1 | EEV | A EEV phase 1(A) |
| J7.2 | B EEV phase 1(B) | |
| J7.3 | A#EEV phase 2(A#) | |
| J7.4 | B#EEV phase 2(B#) | |
| J7.5 | COM EEV common | |
| J7.6 | COM EEV common |
4. Operation
4.1 Control Method (DIP Switches)
The control mode of the device is determined by the settings of DIP switches SW1 and SW4. Adjust these switches according to the desired operational behavior.
- DIP SW1: OFF, DIP SW4: OFF
- Superheat control
- Automatic or use RS485
- DIP SW1: ON, DIP SW4: ON
- Drive mode
- By external signal from J5
- DIP SW1: ON, DIP SW4: OFF
- Manual operation
- By +/- button
- DIP SW1: OFF, DIP SW4: ON
- Temp. control
- Precise temp. control
4.2 Front Panel Buttons
The front panel features several buttons for interaction:
- PRG/rst: Program/Reset button. Used to enter programming mode or reset settings.
- +: Increase value button. Used to increment values during parameter adjustment.
- -: Decrease value button. Used to decrement values during parameter adjustment.
- SEL: Select button. Used to confirm selections or navigate menus.
The display shows current operational parameters such as SH (Superheat), PRESS (Pressure), and OPEN TEMP (Opening Temperature).
5. Maintenance
To ensure the longevity and reliable operation of your Sanhua Electronic Expansion Valve Controller, follow these general maintenance guidelines:
- Keep the controller clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Ensure all electrical connections remain secure. Periodically check for any loose wiring.
- Avoid exposing the unit to direct sunlight, excessive heat, or corrosive environments.
- If the unit is installed in a dusty or humid environment, consider additional protective enclosures.
- Regularly check the sensors for any physical damage or accumulation of dirt that might affect their accuracy.
6. Troubleshooting
If you encounter issues with your Sanhua Electronic Expansion Valve Controller, consider the following basic troubleshooting steps:
- No Power/Display Off:
- Check the power supply connections (J1 terminals) to ensure they are correctly wired and receiving the specified 24Vac/24Vdc.
- Verify the transformer is functioning and providing sufficient power (≥ 30VA).
- Incorrect Readings (Pressure/Temperature):
- Inspect the pressure sensor (J5 terminals) and temperature sensor (J6 terminals) connections for looseness or damage.
- Ensure the sensors themselves are correctly installed and not obstructed.
- Check if the sensor type matches the controller's configuration (if configurable).
- Valve Not Operating Correctly:
- Verify the EEV output connections (J7 terminals) are secure and correctly wired to the expansion valve.
- Check the DIP switch settings (SW1 and SW4) to ensure the correct control mode is selected (e.g., Superheat control, Drive mode, Manual operation, Temp. control).
- If in manual mode, ensure the +/- buttons are being used correctly to adjust the valve.
- If using RS485 communication, verify the communication link (J3 terminals) and protocol settings.
- Auxiliary Relay Malfunction:
- Check the auxiliary relay output connections (J4 terminals).
- Ensure the conditions for the relay activation are met according to your system's logic.
For persistent issues or complex problems, please contact technical support.
7. Warranty and Support
7.1 Manufacturer's Warranty
The Sanhua Electronic Expansion Valve Controller comes with a 12-month limited warranty from the manufacturer for defective items. This warranty does not cover items damaged or misused after receipt. Accessories included with the product are covered by a 3-month warranty.
Defective items must be reported and returned within the warranty period. Please provide your order number and a description of the defect when reporting an issue. Items with an expired warranty will not be repaired or replaced under this policy.
7.2 Return Policy
If you are not satisfied with your purchase, you may return the item within 14 days for a replacement or a refund. Please contact the seller before initiating a return.
7.3 Technical Support
For further assistance, technical inquiries, or support, please contact the seller, All Stars Life Store, through the platform where the purchase was made.
