Add Mitsubishi MSZ-FH I-SAVE mode

[ratnick]

Awesome library - thanks a lot!!

I would really like a simple add-on for my Mitsubishi MSZ-FH heat pump: Support for I-SAVE mode.
In normal heat mode, the A/C only allows down to 16 deg. But it has an option called I-SAVE which allows the temperature to be lowered to 10 deg (which is the temperature you want if you leave a (summer) house during the winter.

I found this link which is hopefully useful: https://img.sauf.ca/pictures/2018-06-01/8efdfb6ea409ba7c5394837904ceeeb4.pdf
I believe they are discussing a setup where the ESP is wired to the connectors on the heat pump (not using IR), but the commands are the same. In section 32, Jakob writes that:

However, this model has an "i-save" mode, which allows you to set the temperature down to 10 C.
I want to be able to set this mode, but looking at the code it doesn't look like it supports that.
Of course I tried to set it from the remote and see what happens, this is what I saw in the debug print outs:
isave 10 degrees, heat, fan auto, vane swing:
HP Packet: 0x62 : 02,00,00,01,01,0f,00,07,00,00,03,94,00,00,00,00 : 0xac
isave 16 degrees, heat, fan auto, vane swing:
HP Packet: 0x62 : 02,00,00,01,01,0f,00,07,00,00,03,a0,00,00,00,00 : 0xa0
heat 16 degrees, heat, fan auto, vane swing:
HP Packet: 0x62 : 02,00,00,01,01,0f,00,07,00,00,03,a0,00,00,00,00 : 0xa0
The only thing that changes, as far as I can see, is the 12th byte.
"94" for 10 degrees, "a0" for 16 degrees.
I tried setting the temperature to 31 C, and it changes to "be"_

I wonder if this is doable? I will try the simple solution, just sending a temperature of 10 deg, but as the heat pump does not provide a status, I will have to wait and see if the temperature drops. A bit slow development cycle :-)

best regards, Nikolaj

[crankyoldgit]

If you want support for it, you will need to do the analysis.
Read & follow this:

• https://github.com/crankyoldgit/IRremoteESP8266/wiki/Adding-support-for-a-new-AC-protocol#raw-data-should-no-longer-be-needed-now
• https://github.com/crankyoldgit/IRremoteESP8266/wiki/Frequently-Asked-Questions#Can_you_reverse_engineer_my_AirCon_protocol_for_me

"10C mode" or "hold" etc modes are uncommon, but supported on some protocols. So this is doable. We just need you to capture the IR signals with IRrecvDumpV2+ and do some fairly simple analysis. e.g. what bytes/bits change with the I-save mode on and off etc.
Using the IRrecvDumpV2 or V3 program will also tell us which actual Mitsubishi protocol it is, as this library supports several.

When you have that info, please create a New Issue and we can track adding it there.

[ratnick]

OK, thanks. I will give it a try. It may take a few weeks, but I'll be back :-)

[ratnick]

@crankyoldgit
Hi again, I have now forked and pushed my proposed changes back.
The interpretation of iSAVE mode may look a bit weird - I think it's because it is kind of weird. Even when the remote shows 10 deg, it still transmits 16 deg, and the 10 deg is only observed in another bit flipping.
I have not made a full implementation of the iSAVE mode. I have (hopefully - not yet tested) made enough to be able to send the right IR code to the A/C. I can only test that when close to the actual A/C (in my summer house).

But so far, I can decode the remote, so it set iSAVE to true when remote shows 10 deg.

I used the general A/C setting "Econo" as iSave. That setting was not used by Mitsubishi, and I guess the intention is the same - to save power by keeping a lower temperature than normal.

[crankyoldgit]

Hi again, I have now forked and pushed my proposed changes back.

@ratnick No PR has shown up here yet.

I used the general A/C setting "Econo" as iSave.

Generally "Econo" mode is different to the 10C mode(s). It's best not to reuse that feature/name. Some A/Cs may have both.

See also:

IRremoteESP8266/src/ir_Fujitsu.cpp

Lines 570 to 597 in 635ec85

	/// Set the 10C heat status of the A/C.
	/// @param[in] on true, the setting is on. false, the setting is off.
	void IRFujitsuAC::set10CHeat(const bool on) {
	switch (_model) {
	// Only selected models support this.
	case fujitsu_ac_remote_model_t::ARREW4E:
	setClean(on); // 10C Heat uses the same bit as Clean
	if (on) {
	_.Mode = kFujitsuAcModeFan;
	_.Power = true;
	_.Fan = kFujitsuAcFanAuto;
	_.Swing = kFujitsuAcSwingOff;
	}
	default:
	break;
	}
	}
	/// Get the 10C heat status of the A/C.
	/// @return true, the setting is on. false, the setting is off.
	bool IRFujitsuAC::get10CHeat(void) const {
	switch (_model) {
	case fujitsu_ac_remote_model_t::ARREW4E:
	return (_.Clean && _.Power && _.Mode == kFujitsuAcModeFan &&
	_.Fan == kFujitsuAcFanAuto && _.Swing == kFujitsuAcSwingOff);
	default: return false;
	}
	}

IRremoteESP8266/src/ir_Neoclima.cpp

Lines 431 to 446 in 77ba26b

	/// Set the 8°C Heat setting of the A/C.
	/// @param[in] on true, the setting is on. false, the setting is off.
	/// @note This feature maintains the room temperature steadily at 8°C and
	/// prevents the room from freezing by activating the heating operation
	/// automatically when nobody is at home over a longer period during severe
	/// winter.
	void IRNeoclimaAc::set8CHeat(const bool on) {
	_.Button = kNeoclimaButton8CHeat;
	_.CHeat = on;
	}
	/// Get the 8°C Heat setting of the A/C.
	/// @return true, the setting is on. false, the setting is off.
	bool IRNeoclimaAc::get8CHeat(void) const {
	return _.CHeat;
	}

[ratnick]

Didn’t really know how to do that, but I think I figured it out now. It’s my first time. 😊 From: David Conran ***@***.***> Sent: 7. november 2021 13:40 To: crankyoldgit/IRremoteESP8266 ***@***.***> Cc: Nikolaj Nøhr-Rasmussen ***@***.***>; Mention ***@***.***> Subject: Re: [crankyoldgit/IRremoteESP8266] Add Mitsubishi MSZ-FH I-SAVE mode (Discussion #1647) Hi again, I have now forked and pushed my proposed changes back. @ratnick <https://github.com/ratnick> No PR has shown up here yet. I used the general A/C setting "Econo" as iSave. Generally "Econo" mode is different to the 10C mode(s). It's best not to reuse that feature/name. Some A/Cs may have both. See also: https://github.com/crankyoldgit/IRremoteESP8266/blob/635ec85164ff7fcd94e7bc5adc3e9f5bba328871/src/ir_Fujitsu.cpp#L570-L597 https://github.com/crankyoldgit/IRremoteESP8266/blob/77ba26b4d9a53a61b243251aec6d8f7183518613/src/ir_Neoclima.cpp#L431-L446 — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1647 (reply in thread)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACASITXV6D6QO77IHEF52P3UKZXTFANCNFSM5GR5XRWA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub> . <https://github.com/notifications/beacon/ACASITRJME4QYCKJ43B7BSLUKZXTFA5CNFSM5GR5XRWKYY3PNVWWK3TUL52HS4DFWFCGS43DOVZXG2LPNZBW63LNMVXHJKTDN5WW2ZLOORPWSZGOAAMHAUQ.gif>

[ratnick]

Hmm, thanks. Let me see if I can copy that approach instead.