246 12.4 Outline of Functions
Interface for use in LONWORKS
®
12.4.4 Setting/Monitoring Restrictions from LON according to A/C Unit Model/Installation
Method
- Operation mode changeover commands directed to A/C units without a cooling/heating option are ignored. If the same
command is sent to A/C units with the option, the operation mode of subordinate A/C units (without the option) may be
changed over even if there is no direct instruction.
- When A/C units without Auto Mode are set on Auto, the Auto Mode (message) is ignored and the temperature control
mode at that moment is maintained.
- BS units are not handled in any special manner.
- When sub A/C unit within a remote control group have a location address, they are monitored as one A/C unit.
However, all commands directed to these A/C units are ignored.
- Upon the occurrence of an error within a remote control group, the Interface for LONWORKS
®
reports as follows:
(1) In cases where only the main A/C units within a remote control group have location addresses:
When any of the indoor units within the group malfunctions, the respective message is sent to the LON monitoring
node in the form of the A/C number of the main A/C unit. In other words, if any of the A/C units within the group
malfunctions, the message is output. However, the LON cannot recognize in which unit the error is occurring.
(2) In cases where all the indoor units within an remote control group have location addresses:
When any of the units within a group malfunctions, the corresponding message is sent to the LON monitoring node
in the form of the A/C numbers of all main and sub A/C units within the group. In other words, if any one of the A/C
units within the group malfunctions, the message is sent reporting all A/C numbers within the group; once again the
LON cannot recognize in which unit the error is occurring.
However, this can be confirmed on a hand-held remote controller.
- When the A/C units and HRV are being controlled as a remote control group, the HRV cannot be independently
operated by the central monitoring panel.
(If the independent operation command is sent to the HRV with a remote controller, the operation mode becomes
‘ventilation’.)
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