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MULTI V 5 Outdoor Unit Service Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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OTHER CONTROLS
Setting Optional Modes
Refrigerant Sound Reduction Mode
(SE9)
This function reduces refrigerant flow sound in the liquid piping
caused by mixed-state refrigerant by adjusting air flow across the
outdoor unit coil. It reduces the refrigerant flow sound at all indoor
units when system is operating in heating or cooling. The function
will impact all indoor units; selective indoor unit application is not
possible.
In cooling, when the compressor speed remains constant, reduc-
ing the airflow over the outdoor unit coil raises head pressure and
sub-cooling. Increased subcooling reduces the possibility that gas
bubbles will form in the liquid line before reaching the indoor unit
EEVs.
In heating, when the compressor speed remains constant, the
temperature of the superheated gas leaving the compressor and en-
tering the indoor coil is reduced. This results in slightly less heating
performance, but sub-cooling rises in the liquid leaving the indoor
(condenser) coil. More sub-cooling keeps gas bubbles from forming
before the liquid passes through the condenser coil EEV valve.
Can be used with Fn14 - Smart Load Control and Id10 - Comfort Cooling without severely impacting the energy saved or reducing comfort
levels
For use on both heat pump and heat recovery systems.
• Because of the restricted refrigerant flow, it will take longer to preheat the coil on startup.
• An incorrect charge can result in refrigerant flow related sound. Verify the system’s refrigerant charge is correct before using this function.
Table 45: Setting the Refrigerant Sound Reduction Function.
Settings Adjustment Description
oFF (Default) Normal RPM No Adjustment
oP1 Normal - 200 Outdoor Unit Fan Speed Reduced by 200 RPM
oP2 Normal - 100 Outdoor Unit Fan Speed Reduced by 100 RPM
Turn No. 5 on the master outdoor unit PCB
DIP switch bank SW01 to ON.
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Select from “oFF”, “oP1”, or “oP2” by using the SW03C forward
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Figure 35: Setting the Refrigerant Sound Reduction Function.
Press the SW01D Reset Button one (1) time to reset PCB.
The Refrigerant Sound Reduction function begins.
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