Harbor Point HF-25GW Installation, Operation And Maintanance Manual page 27

OPERATION SECTION FOR
Remote Control Operation
HF-51/HF-70 & HFR-51/HFR-70
When air-conditioner is cool-only model, the HEAT
mode is bypassed to FAN mode.
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This button, when pressed, starts operation
and stops when pressed again.
This button is used for selection of the left/right air
flow direction, whenever pressed the flap changes
from osculating to fix, or from fixed to osculating.
(fixed direction)