Release notes ACC MTL, MT-1 and MG Description: Air Center Control with 7" display, 10" display and gateway without display Software version: 7.0.0 Release date: August 2026 Hardware: ACC MTL: 7 738 114 119, ACC MT-1: 7 738 114 120, ACC MG: 7 738 114 121 These release notes show an overview about the status of the software including limitations and known issues of ACC software version 7.0.0. Software Status 7.0.0: ---------------------- Software release for ACC Gen2 (for ACC MTL, ACC MT-1, ACC MG variants) Newly added features: - RAC/ Multi/ Large system compatibility (AC-MBG support) Improvements: - ED meterless with higher accuracy - ED improvements - Perfomance improvement on max system support - OS upgrade from Kirkstone to Scarthgap - Java upgrade (Bosch IOT SDK, Azul Zulu) Software limitations / known issues: ------------------------------------ Depending on the device type: - ACC MTL is feature-limited. It does not offer: - Calendar - Floor plan manager - Energy distribution (meter-based) - ACC MG is display-less. It can be accessible only via PC interface. General: - To be able to select a country not yet existent in the pre-installed software version, this version must be already installed first. A factory reset is required after a software update to reach the installation wizard again to select the country. - Sometimes after a scan, the values for indoor units do not get updated on the GUI. Workaround: reboot once after scanning via the menu (graceful reboot). - AF4300 / AF5301 cannot be connected on the same XYE as MDCI/Multi Split/Large Split, or AF5300/AF6300 systems This general system limitation means, one XYE port only supports - either AF4300 / AF5301 systems - or AF5300/AF6300 systems - or MDCI/Multi Split/Large Split systems. - The internet status is not reflected immediately when the connection status changes. The UI update is often delayed and may only occur after a device restart. - A "System Not Ready" message is displayed after power-up until the system is fully initialized and operational. RAC/ Multi/ Large: - General Limiation - Auto mode can be enabled on all controls (ACC, ARC and IRC) for IDUs connected to RAC/ Multi/ Large systems. - Fan speed is with a maximum of 3 levels along with Auto mode. Although certain RAC units offer 7 Fan speeds, it is mapped to 3 levels in the ACC. - Only mode, ARC and IRC lock are possible, other locks are non-functional in RAC/ Multi/ Large systems. - ACC shows common icon for all RAC/Multi/Large systems. - The current outdoor temperature display is not available. - System and outdoor unit information is not available. - Energy distribution, monitoring, output limitation are not available. - Modbus TCP/IP data points are not available. Lock manager: - When changing the lock settings very fast multiple times on the same IDUs, the lock status displayed on the ACC may be out-of-sync. For example, the ACC shows no lock, although a lock within the IDU exists (locks are generally stored within the IDUs, not within the ACC). Work around: E.g. when setting a lock, and unsetting it again on the same IDUs, wait at least one minute after the first change before performing the second change of the lock settings. IDU listings: - Scrolling with a long list of IDUs: Use either scroll bar, or touch the white area left of the check boxes or right of the rename icon to scroll instead of drag-n-drop. Fault and event history - In rare cases (more than one error of a single system device), already solved errors on IDU side still show as pending error within the fault and event history. If this is the case, please clear the fault and event history. MDCI: - General system limitation - Dry mode can be enabled on all controls (ACC, ARC and IRC) for IDUs connected to MDCI systems, but response to ACC is always cooling mode. This means, after some seconds, ACC will show cooling mode instead of dry mode. - Only mode and IRC lock are possible, although others like ARC lock are now offered by the ACC, those locks are non-functional in MDCI systems. - IDUs which are in mode conflict are shown as "off" on ACC. - ACC shows always the default icon "4-way cassette IDU", independent from the real IDU type. - The current outdoor temperature display is not available. - System structure: No outdoor unit information available. - System monitor: No diagnosis data available for MDCI systems. - Limitations depending on ODU firmware - Although the ACC offers seven fan speeds, those may be mapped to three fan speeds in case the ODU executes an old firmware (update not possible). Use of seven fan speeds via the ARC and IRC still possible. Climate 5000L / Climate 5000M - ACC MT shows always the default icon "4-way cassette IDU", independent from the real IDU type. - Although the ACC offers seven fan speeds, those are be mapped to three fan speeds. Use of seven fan speeds via a local control is still possible. Energy distribution: - In case of a broken Modbus/RTU connection to a energy meter, the energy distribution report may need manual correction. - For larger system configurations, hourly energy distribution reporting is available only for a single day. Contact: -------- In case of facing abnormalities and limitations which are not recoverable by the resolutions offered in this document, please contact your regional sales department.