System Set-Up
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• Following features are permitted in emergency operation :
- Operation On/Off
- VIEW TEMP button(*)
- Temperature adjusting button(**)
- Sanitary water heating button
(*) : Temperature measured by failed sensor is displayed as ‘- -’.
(**) : The unit is not turned on/off according to the setting temperature at the remote controller.
It is turned on/off according to the thermostat signal.
• Following features are NOT permitted in emergency operation :
- Operating mode (heating/ weather-dependent) selection
- Time scheduling
- SET TEMP button
• Duplicated trouble : Option trouble with Slight or Heavy trouble
If option trouble is occurred with slight (or heavy) trouble at the same time, the system puts higher
priority to slight (or heavy) trouble and operates as if slight (or heavy) trouble is occurred.
Therefore, sometimes sanitary water heating can be impossible in emergency operation mode.
When sanitary water is not warming up while emergency operation, please check whether the sani-
tary water sensor and related wiring are connected well or not.
• Emergency operation is not automatically restarted after main electricity power is reset.
In normal condition, the unit operating information is restored and automatically restarted after main
electricity power is reset.
But in emergency operation, automatic re-start is prohibited to protect the unit.
Therefore, user must restart the unit after power reset when emergency operation has been run-
ning.
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