Mitsubishi Electric PAC-IF051B-E Installation Manual page 30

5. Dip Switch setting
5.5 Emergency mode (Heater only operation)
The emergency mode is available when a failure on the outdoor unit of the heat pump or a communication error occurs.
This mode uses booster heater or immersion heater as a heat source and automatically controls between the DHW mode and the heating mode. When the system is not
incorporated with heater, the emergency mode is not available.
Before starting the emergency mode, turn off the outdoor unit and FTC4 (Master), and then turn Dip SW 4-5 to ON. Then, turn on FTC4 (Master) to start the emergency
mode. FTC4 (Master) can be power-supplied by the outdoor unit or directly by power source.
If emergency mode is no longer required, please turn off both outdoor and indoor unit power supply before returning Dip SW4-5 to OFF position.
5. Emergency mode (Boiler operation)
The emergency mode is available when a failure on the outdoor unit of the heat pump or a communication error occurs.
This mode uses boiler as a heat source and automatically controls the heating mode. When the system is not incorporated with boiler, the emergency mode is not avail-
able.
Before starting the emergency mode, turn off the outdoor unit and FTC4 (Master), and then turn Dip SW 4-6 to ON. Then, turn on FTC4 (Master) to start the emergency
mode. FTC4 (Master) can be power-supplied by the outdoor unit or directly by power source.
If emergency mode is no longer required, please turn off both outdoor and indoor unit power supply before returning Dip SW4-6 to OFF position.
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