Daikin Altherma with BRP adapter - plan-d-io/SGR-dongle GitHub Wiki
Older versions of the Daikin Altherma 3 do not have integrated SGR contacts, but require the BRP069A61 LAN adapter. This requires some more preparation.
The main function of the BRP LAN adapter is to add network connectivity to your Altherma, so you can control your heatpump through the Daikin app. Newer Althermas have this feature built-in. The LAN adapter (and only the LAN adapter, not the WiFi adapter!) also provides SGR contacts.
The (green) X1A connector provides the SGR contacts. In contrast to the SGR contacts in newer Altherma heat pumps, these are not potential-free contacts, but require a 230V mains signal to function (the a2 connection on the schematic). This was probably designed to be connected to smart WiFi power outlets. The manual stipulates you need to secure this connection with a fast acting 100mA-6A fuse.
The BRP LAN adapter X3A connector must be hooked up to the P1/P2 or A2P user interface of the heat pump, which also connects to the room thermostat. You can connect both the adapter and the thermostat in parallel. Power to the adapter is provided trough this interface.
Materials required
- SGR cookie with relay unit
- BRP069A61 LAN adapter
- Inline fuse holder, e.g. Farnell ref 3650464
- Suitable cartridge fuse, 230V max 6A, e.g. Farnell ref 1354593
- Mains Power Cord with wire ends, e.g. Farnell ref 1124386
- Some 0,75-1.5mm² flexible electrical wires
- A JST-XH 5p wire-ended connector, e.g. Tinytronics ref 002020
- Several meters of 4- or 8-wire twister pair cable
- (Optional) 4-pins solderless pluggable terminal blocks, e.g. these from AliExpress
Assembly instructions
Step 1: prepare the BRP LAN adapter
- Unpack the adapter. Unpack the green connector terminal. This connector slides on and clicks onto the copper X1A SGR contacts on the adapter PCB. However it is easier to first connect the wires before clicking it onto the PCB.
- Break off one of the cable entry points of the adapter enclosure. Unpack a cable gland. Make a hole in it with a screwdriver.
- Run the wire end of the mains power cord several centimetres through the gland. Mount the cable gland in the adapter enclosure.
- Connect the phase/line wire of the power cord to the inline fuse holder (e.g. with a WAGO terminal). Securely insert the other end of the fuse holder to the first
Lterminal on the green connector. - Securely insert the neutral wire end of the power cord into
Nterminal of the green connector.
You need to press the orange part of the connector in with a small flat-headed screwdriver. This opens up the terminal below it, so you can insert the blank copper part of the wire
- Insert a cartridge fuse into the fuse holder
- Cut off 4 pieces of flexible wire to around 5cm length. Denude the wires at both ends. This will be used to connect the relay unit to the SGR connector.
- Securely insert the 4 wires into the
SG0andL, andSG1andLterminals. - Slide, press and click the green terminal onto the PCB. Mount the PCB into the adapter enclosure with the 4 provided screws.
- Take the cookie relay unit. Connect the
SG0andLwires to relay 1, and theSG1andLwires to relay 2. - Connect the cookie relay unit to the SGR cookie.
The end result should look something like this.
Step 2: connect the cookie to the Altherma mainboard
- Disconnect power from the heat pump
- Open up the heat pump to gain access to the main circuit board.
- Locate the X10A connector on the mainboard. This is a 5-pin shrouded connector placed semi-central on the heat pump circuit board.
The X10A connector has the following pin-out:
| X10A | ESP32 |
|---|---|
| 1-5V | 5V |
| 2-TX | RX_PIN (goes to TX on the dongle) |
| 3-RX | TX_PIN (goes to RX on the dongle) |
| 4-NC | Not connected |
| 5-GND | GND |
Depending on the version number of your Altherma 3, the X10A might be upside down. Locate pin #1 by looking for the encircled 1 printed on the circuit board.
- Plug in the PTH cable, respecting the polarity of the connector. Be careful not to bend any pins!
Note that the X10A cable is not PTH-compliant. Your 5-pins PTH cable must have flat sides everywhere. If it has polarity 'ridges', it will not fit. Trim these down with small pliers and/or a file).
- Run a cable with at least 4 wires from the inside of the heat pump to the location you want to place the BRP adapter. Do not forget to make this cable enter the BRP adapter enclosure through a cable gland!
- Use the pluggable terminal blocks (or some other reliable form of connection) to connect the wire ends of the PTH cable to the cable running to the SGR cookie in the adapter. You only need to connect the 4 signal wires, you can cut off or wire wrap the
NCwire (so it doesn't touch anything on the circuit board).
- Connect the cable coming from the X10 connector the screw terminal of the SGR cookie according to the schematic below. Note: the wire colours in the schematic are for illustration only!
Step 3: connect the BRP adapter to the P1/P2 (A2P) user interface
- Next to the heat pump mainboard, locate the screw terminals labeled
A2P USER INTERFACEorP1P2 - On the BRP adapter, locate the
X3Aconnector (with additionalP/P1andN/P2labels) - Run a single pair of twisted wire between the
A2P USER INTERFACEterminal on the mainboard to theX3Aconnector on the BRP adapter. Polarity doesn't matter. Do not forget to make this cable enter the BRP adapter enclosure through a cable gland!
Step 4: finalising
- Make sure all new or modified connections are safe and secure
- Close up the heat pump again
- Reapply power to the heat pump. The SGR cookie should receive power from the X10 connector and start up (LED going from red to green). The BRP adapter receives power through the P1/P2 interface, its LEDs should start blinking.
- Connect the mains power cable to a 230V power outlet socket