LG THERMA V AHBW076A0, Service Manual, Page: 22 / 98

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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 unit, Air-to-Water heat pump is generally operating 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.
- Heavy trouble :
Compressor cycle trouble.
- Option trouble :
a problem is found for option operation such as water tank heating. In this trouble, the trou-
bled 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