Si33-105 Test Operation
Test Operation R407C PLUS Series Heat Recovery System 119
1.6 Low Noise Operation
By connecting the external contact input to the low noise input of the outdoor unit external
control adaptor for outdoor unit (optional), you can save power and lower operating noise by 2 -
3 dB.
Instructions for
Demand Control
Operation
1. Outdoor unit field setting
&
Setting mode 1: Set low noise operation to “ON.”
&
Setting mode 2: Match low noise operation and demand control address with address of
outdoor unit external control adaptor.
2. Outdoor unit external control adaptor setting
&
Function switch (SS1)
Set to “BOTH” or “DE.”
&
Address setting switches (DS1, DS2)
Match with outdoor unit low noise operation and demand control address.
3. Short-circuit the low noise input of outdoor unit external control adaptor for outdoor
unit.
Low Noise
Control System
Example
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