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LG AHUW076A2 Manual

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Using Thermostat
26 Air-to-Water Heat Pump
Emergency Operation
• Definition of terms
- Trouble : a problem which can stop system operation, and can be resumed temporally under
limited operation without certificated professional's assist.
- Error : problem which can stop system operation, and can be resumed ONLY after certificated
professional's check.
- Emergency mode : temporary heating operation while system met trouble.
• Objective of introducing 'Trouble'
- Not like airconditioning product, Air-to-Water heat pump is generally operation in whole winter
season without any system stopping.
- If system found some problem, which is not critical to system operating for yielding heating
energy, the system can temporarily continue in emergency mode operation with end user's
decision.
• Classified trouble
- Trouble is classified two levels according to the seriousness of the problem. : Slight trouble and
Heavy trouble
- Slight trouble : Sensor trouble. In most case, this trouble is concerned with sensor problems.
The unit is operating under emergency mode operation(level 1).
- Heavy trouble : Compressor cycle trouble. Emergency mode operation(level 2) is performed by
optional electric heater.
- Option trouble : a problem is found for option operation such as water tank heating. In this
trouble, the troubled option is assumed as if it is not installed at the system.
• Emergency operation level
- When system met trouble, it stops operation and wait for user’s decision : Calling service center
or starting emergency operation.
- To start emergency operation, user simply push ON / OFF button once more.
- Two different levels are prepared for emergency operation : High temperature cycle and low
temperature cycle.
- In emergency operation mode, user can not adjust target temperature.
※ It can not be operated, if the electric heater accessory is not installed.
High temperature cycle OFF 50°C 24°C 70°C
Low temperature cycle ON 30°C 19°C 50°C
Dip
Switch
(#4)
Target
Leaving Water
Temperature
Target
Room Air
Temperature
Target
Sanitary Water
Temperature
… 26 …


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