ESPAltherma v2 and Dashboard drawing for bi-zone units (direct zone + mixed zone with mixing valve)

[pvodoz]

Hi @raomin and thanks for ESPAltherma 2. The new web interface and the installation drawing are great.

I'm from France and my unit is an EHVZ04S18DA6V (ERGA04DAV3 + EHVZ, definition ERGA D EHV-EHB-EHVZ DA series 04-08kW). It is a bi-zone integrated indoor unit. According to the Daikin installer reference guide (piping diagram 3D112187A, doc 4P495249-1A), after the space heating / DHW 3-way valve (M3S) the water splits into two zones.

Is it possible to deal with?

[raomin]

Salut @pvodoz!
Yes, it should be doable. Your definition already has the values of the second zone, they're just not selected by default: Mixed water temp. (R7T, the mixed zone outlet), Main pump / Add pump, and LW setpoint (main) / (add). Could you select them in the Values tab and tell me what they read while both zones are heating, or paste the Diagnostics → Heat pump survey?
Then I'll see how to draw the two zones: the direct one straight after the heat pump, and the mixed one with its valve and R7T.

[pvodoz]

Salut! ;) Is it what you need? { "v": 1, "fw": "2.0.0-beta.1", "board": "esp32", "protocol": "I", "key": "I|63:017074524000|60:0174|CAP:50|11:015029630302|00:C4E7", "id": { "iu_eeprom": "017074524000", "iu_as": "AS1707452-04", "iu_sw": "0174", "iu_cap": 80, "iu_opt": 16, "iu_eeprom_ver": 0, "iu_code": "0000", "ou_eeprom": "015029630302", "ou_pn": "1P502963-3", "ou_mpu": "C4E7", "ou_cap": 80 }, "regs": { "10": "01000000000000000000000000000000", "11": "015029630302", "20": "6E000000CD0000005F0000002800000001", "21": "00000000EB00005F0000000000000000", "30": "000000C201000000000000", "60": "8000180000005026021201C00210017400", "61": "8000CB00C900F800CB000602CA005C00", "62": "8000881201DC00400109010D0400006400", "63": "8000017074524000", "64": "8000020000000012010607000D020505", "65": null, "00": "04010001010100000101C4E750", "A0": null, "A1": null }, "detect": { "model": "Altherma(ERGA D EHV-EHB-EHVZ DA series 04-08kW)", "family": "L", "confidence": "medium", "method": "as_number+rules", "margin": 26, "candidates": [ { "model": "Altherma(ERGA D EHV-EHB-EHVZ DA series 04-08kW)", "score": 51 }, { "model": "Altherma(ERGA D EHV-EHB-EHVZ DJ series 04-08 kW)", "score": 25 } ] } } Tell me if you need further information

…

----- Mail original ----- De: "Raomin" ***@***.***> À: "raomin/ESPAltherma" ***@***.***> Cc: "pvodoz" ***@***.***>, "Mention" ***@***.***> Envoyé: Dimanche 11 Octobre 2026 22:26:48 Objet: Re: [raomin/ESPAltherma] ESPAltherma v2 and Dashboard drawing for bi-zone units (direct zone + mixed zone with mixing valve) (Discussion #602) Salut @pvodoz! Yes, it should be doable. Your definition already has the values of the second zone, they're just not selected by default: `Mixed water temp.` (R7T, the mixed zone outlet), `Main pump / Add pump`, and `LW setpoint (main)` / (add). Could you select them in the Values tab and tell me what they read while both zones are heating, or paste the Diagnostics → Heat pump survey? Then I'll see how to draw the two zones: the direct one straight after the heat pump, and the mixed one with its valve and R7T.

-- Reply to this email directly or view it on GitHub: #602 (comment) You are receiving this because you were mentioned. Message ID: ***@***.***>

[raomin]

Thanks @pvodoz, exactly what I needed! Your readings confirm the layout: R7T (mixed water) at 17.9°, both pumps on, 27.4° target on both zones.
I've added the two zones to the drawing: the mixing valve with its reading and target, a pump per zone, radiators for the direct zone and the floor loop for the mixed one. It shows up by itself as soon as Mixed water temp. is among your selected values and other than 0 :)
It'll be in the next beta for the web page; the Home Assistant card already has it in v1.0.2 (update it in HACS).

[pvodoz]

Many Thanks! I will propose you an update of the diagram because there's something weird with the end of each zone...

[pvodoz]

Proposition of a new picture with Claude Help

[pvodoz]

[pvodoz]

Hi @raomin What do you think about the last proposed drawing for bi zone?

[raomin]

Salut @pvodoz, sorry for the wait! You were right about the end of the zones: each zone now goes back to the indoor unit on its own return. Here's a proposal based on your drawings:

• The house is split in two floors: the direct zone upstairs with its water target, the mixed zone downstairs with the room temperature.
• The mixed zone's pump is on its return, before the bypass to the mixing valve, as in the Daikin diagram; pump l stays on the main return.
• Where pipes cross without joining, the pipe underneath is interrupted.
• The pressure gauge moved to the supply, where B1PW is.

I kept the Daikin part names (M1S, M3S, B1PW…) out of the drawing so it stays readable for everyone. What do you think? If it looks right to you, it goes in the next beta and in the Home Assistant card.

[pvodoz]

@raomin sounds good! So waiting the next beta ;)

[pvodoz]

Additionaly, is there any way to download the ota file of beta branch?

[raomin]

@pvodoz the new two-zone drawing is in v2.0.0-beta.9, out now: System → Firmware update → Check for an update. Two-zone units also get the mixed water, both pumps and the second zone's target selected by default now.

For the beta branch between releases, tick Development builds next to Check for an update: it installs the latest preview build, no file needed. The files of each release are on the releases page (esp32-ota.bin for an ESP32 DevKit). The Home Assistant card gets the new drawing is now in the newest version (1.0.10)

[pvodoz]

@raomin , I noticed some diplay bugs for wrong colored piped in mono and bi zone.
I also propose you to redesign the display as follow for better comprehension. The upper pump is principal pump, and the lower one is the additional.

[raomin]

Ok, I reworked this topic using your daikin schema. For me this should be good:

What do you say?

[pvodoz]

@raomin that's perfect for the schema.
Also a proposition to put the Target/real mixed water temperature in a same tootltip but near from the mixed zone from the house.
And in the house, differentiate Air temperature from heatpump water temperature

[pvodoz]

@raomin, do you know when you will change the bi zone schema in beta and HA card?

[stav242]

can someone point me at the HACS card setup please.

[raomin]

You need first HACS, then follow here on Readme of ESPAltherma card. Let me know if you're struggling.

[herbert131]

Is this bi-zone also available on the web web interface or only on HA? I do have a seconde zone but its just shown in web interface .

[pvodoz]

available in HA but need some changes. you need ESPAltherma card

[herbert131]

I installed it in HACS, but still the second zone is not visible:

this is my data: ( the Wohnzimmer temp seems a little too much ;-)
{
"v": 1,
"fw": "2.0.0-beta.23",
"board": "m5stickcplus2",
"protocol": "I",
"key": "I|63:017099680101|60:1335|CAP:50|11:074F01000100|00:----",
"id": {
"iu_eeprom": "017099680101",
"iu_as": "AS1709968-1 A",
"iu_sw": "1335",
"iu_sw_id": "23015103",
"iu_cap": 80,
"iu_opt": 51,
"iu_eeprom_ver": 0,
"iu_code": "0000",
"ou_eeprom": "074F01000100",
"ou_mpu": "----",
"ou_cap": null
},
"regs": {
"10": "01400000000000800002000000000000",
"11": "074F01000100",
"20": "34004000BC0248004800AB012F002F0001",
"21": "00000000AB0100000000A00284017501",
"30": "000000E00100000000000080000000",
"60": "8000000000005000000000600033133500",
"61": "8000F501F40100000000BC0104000000",
"62": "800000000000000020290010000000BBFF",
"63": "8000017099680101EF0100000000000000",
"64": "8000020000000000000000006AFE0505",
"65": "8000F50100000000000000000000000000",
"66": null,
"00": "0D010001020101020401",
"A0": "02080208E427C0040000753703210000",
"A1": "C02DEC2D00EE0200000B850134010000"
},
"detect": {
"model": "Altherma 4(EPSK-EPSKS EPBX-EPSX-EPVX-EPVZ series 04-14kW)",
"family": "G",
"confidence": "high",
"method": "as_number",
"margin": 100,
"candidates": [
{
"model": "Altherma 4(EPSK-EPSKS EPBX-EPSX-EPVX-EPVZ series 04-14kW)",
"score": 50
}
]
}
}