Mitsubishi Electric EHPT20X-VM2HA, Service Manual

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<Emergency operation>
In Emergency operation mode the outdoor heat pump unit will not operate. Heat
-
ing for DHW and space heating is provided by the booster heater and the tank
immersion heater (if installed). Space heating flow temp is restricted 40°C if an
immersion heater is not present on the DHW tank then the booster heater will
also indirectly heat the DHW.
When in Emergency operation the main control has NO control functions. It's only
function is to display the Main screen and Information screen by pressing F1, all
other buttons are disabled.
• Activating Emergency operation mode
To activate Emergency operation see the following:
Switch OFF the breaker for the outdoor unit (or both breakers if cylinder pow
-
ered independently).
Change DIP switch SW4-5 to ON.
Switch ON the breaker(s).
Emergency Operation is now activated.
• Deactivating Emergency operation mode
To deactivate Emergency operation see the following:
Switch OFF the breaker for the outdoor unit (or both breakers if cylinder pow
-
ered independently).
Change DIP switch SW4-5 to OFF.
Switch ON the breaker(s).
Emergency operation is now deactivated.
WARNING
Do not attempt to change the DIP switches whilst the breaker(s) are ON as
this could result in ELECTROCUTION.
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