Daikin Super Multi NX C-Series Service Manual page 117

Control Specification
3.16.5 Cooling / Heating Mode Lock
Use the S100 connector to set the unit to only cool or heat.
Setting to only cool (C): Short-circuit pins 1 and 3 of the connector <S100>.
Setting to only heat (H): short-circuit pins 3 and 5 of the connector <S100>.
The following specifications apply to the connector housing and pins.
JST products Housing: VHR-5N
Note that forced operation is also possible in COOL / HEAT mode.
106
Pin: SVH-21T-1, 1
COOL mode (C)
5<C>3<H>1
HEAT mode (C)
(R1397)
SiE12-411
Function and Control