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Haier YR-E20 Operation & Installation Manual page 23

Wired controller

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3.This function is valid only when SW4 is OFF and invalid
when SW4 is ON.
Switch between Fahrenheit and Celsius
1. If the current temperature is displayed in Celsius, set temp.
should be adjusted to 30°C in each mode(when energy
saving function is set currently, the heating mode will be
the highest limit value of the energy saving function). Then
press
key for 15s to switch to Fahrenheit, the interface
will display 86°F (when energy saving function is set, its
highest limit value of Fahrenheit will be displayed).
2. If the current temp. is displayed in Fahrenheit,set temp.
should be adjusted to 60°F in each mode(when energy
saving function is set currently, the cooling/dry mode will be
the lowest limit value of the energy saving function). Then
press
key for 15s to switch to Celsius, the interface will
display 16°C (when energy saving function is set, its lowest
limit value of Celsius will be displayed).
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