11 | Configuration
Installer reference guide
54
2MXM40+50A
R32 Split series
4P600463-4E – 2021.12
11.2 About night quiet mode
The night quiet mode function makes the outdoor unit run more quietly at
nighttime. This will reduce the cooling capacity of the unit. Explain Night quiet
mode to the customer and confirm if customer wants to use this mode.
11.2.1 To turn ON the night quiet mode
Prerequisite: The main power supply MUST be turned off.
1 Remove the top plate and the electric box cover of the outdoor unit (see
"11.1.1To turn ON ECONO mode prohibition setting"[453])
2 Cut the jumper J6.
3 Reinstall the top plate and the electric box cover.
CAUTION
When reinstalling the electric box cover, be careful not to pinch the fan motor lead
wire.
11.3 About heat mode lock
Heat mode lock limits the unit to heat operation.
11.3.1 To turn ON heat mode lock
1 Remove the top plate (2 screws) and the front plate (8 screws).
2 To set heat mode lock remove the S99 connector.
3 To reset the heat pump mode (cooling/heating), plug the connector back.
a Front plate
b Top plate
c S99 connector
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