Materials Needed:

• Control box extension
• Appropriate screwdriver tools
• Labels for marking wires if necessary

Steps:

1. Electrical Safety: Before starting any work, ensure that the heat pump is completely disconnected from any electrical power source. This may involve cutting the main power supply or disconnecting the heat pump from its power source.

2. Locate the Panel: Find the control panel of the heat pump. Typically, this panel is located to the left of the equipment's nameplate.

3. Open the Panel: Use the appropriate screwdriver tools to open the control panel by unscrewing the screws on the left and right sides of the panel.

4. Remove Cable Gland: Identify the cable gland among the four present and unscrew the one located furthest to the right.

5. Prepare the Wires: You'll need four separate wires for this installation. Connect them according to the following indications:

   • Green wire -> Slot A
   • Yellow wire -> Slot B
   • Black wire -> Slot G
   • Red wire -> Slot V

6. Wire Connection: Take the green wire and connect it to the slot marked as A on the control box. Repeat this process with the yellow, black, and red wires, connecting them respectively to slots B, G, and V.

7. Check Connections: Once all wires are correctly connected, ensure they are securely fixed. Also, check for any excess wires that could cause a short circuit or malfunction.

8. Close the Panel: Reassemble the cable gland properly and close the control panel by screwing back the previously removed screws.

9. Final Check: Before reconnecting the heat pump, double-check that all wires are correctly connected and that the control panel is securely closed.

10. Reconnect Electrical Supply: Now, reconnect the heat pump to its electrical power source.

11. Testing: Power on the heat pump and perform a test to ensure that the control box operates correctly with the newly installed extension.

Safety Tips:

• Make sure to wear appropriate protective gear when working with electricity.
• If you're not confident in your electrical skills, it's recommended to hire a professional to perform this installation.

By following these steps accurately, you should be able to install the control box extension for your heat pump professionally and safely.