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Emergency Operation
• Definition of terms
- Trouble : a problem which can stop system operation, and can be resumed temporally under lim-
ited 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 ener-
gy, 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 : a problem is found inside the indoor unit. In most case, this trouble is concerned
with sensor problems. The outdoor unit is operating under emergency mode operation condition
which is configured by DIP switch No. 4 of the indoor unit PCB.
- Heavy trouble : a problem is found inside the outdoor unit. As the outdoor unit has problem, the
emergency mode operation is performed by electric heater located in the indoor unit.
- Option Trouble : a problem is found for option operation such as water tank heating. In this trou-
ble, 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.
High temperature cycle
Low temperature cycle
Target
DIP
Leaving Water
Switch
Temperature
OFF
50°C
ON
30°C
Using Thermostat
Target
Target
Room Air
Sanitary Water
Temperature
Temperature
24°C
70°C
19°C
50°C
Owner's Manual 27
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