| Technical Instructions | |
| No. | 0295 |
| Revision | 01 |
Please note: Ensure the electrical supply to the unit is completely isolated before any remedial work is carried out.
Technical instruction to be carried out by a competent person(s).
1. Ensure the power supply to the unit is completely isolated.
2. Remove the 2no. screws that secure the top panel to both left and right side panels. Remove the top panel from the unit.
3. Remove the 2no. screws that secure the front panel to the Main Control Board bracket. Pull the top of the front panel towards the front and then pull up to remove.
4. Disconnect and discard the HMI cable and Carb Level Sensor – RED. Disconnect and retain the NTC sensor – GREEN.
5. When disconnecting the Carb Level Sensor ensure not to disconnect from the carb level probe. Image shown is NOT GOOD – Heat shrink should cover the probe and blue wire to the probe must remain connected.
6. Disconnect the wires for the compressor, fan, and AC input. Remove the 4 x screws securing the PCB
7. Remove and discard the old PCB.
8. Secure the new PCB to the PCB fixing plate with the 4 x screws. Secure the Anti-Drip Jumper provided in the upgrade kit to the connector labelled ‘Flow Meter’
9. Individually disconnect the solenoid wires from the old PCB and reconnect to the new PCB, ensuring the right wire is connected to the right input/output. The connectors are labelled on both boards.
10. Connect the AC power input Connect the Carb pump (Red Live, Black Neutral).
11. Clip the cable ties securing the compressor wires and the fan wires.
12. Identify the two wiring looms, the compressor HAS the earth wire.
13. Connect the fan and compressor wires.
14. Connect the new HMI wire to the HMI interface connector and secure to the USB connector on the back of the unit.
15. Connect the Carb Level Sensor to the PCB and the blue wire from the Carb Level Probe. Connect the NTC sensor.
Ensure the NTC sensor probe is firmly down into the tube. Then ensure all wiring connections are correct and secure before proceeding.
Test the unit before refitting the panels.
