(trimmers) to manually adjust the volume for both the entry panel speaker and the indoor receiver. 🔌 Terminal Connections
The system gauge reads zero or low pressure, even when the pump is running.
| Terminal Label | Wire Color (Typical) | Function | | :--- | :--- | :--- | | | Red | Positive Power (12V DC) | | - | Black | Negative Power (Ground) | | A | Yellow or White | Audio (Listen/Talk bus) | | C | Blue or Green | Call / Common line | | S (if present) | Orange | Secondary / Service (rarely used in basic audio) |
Adjust these while the system is live (with a visitor at the door or an assistant testing the call). Use a non-conductive ceramic screwdriver to avoid shorting the circuit.
If you found this article because you moved into a new apartment and the manual is missing, here is how to use the BPT HA 200: