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9. Functions and Protection Features
9.1 Functions
9.1.1 “COOL” Mode
Temperature range: 61~86°F
4 way valve position: Closed (Off)
On operation: • The compressor will only start running when any of the indoor units call
for cooling and the compressor delay interval has passed.
• When the compressor is operating, the electronic expansion valve and
outdoor fan will also turn on.
• Using the indoor/outdoor ambient temperature, the set temperature,
and the operating indoor units’ capacity, the main board will calculate
the system’s load and set the working frequency of the inverter
compressor.
Off Operation: • The compressor will stop running when all indoor units have reached the
set temperature.
• If one indoor unit has reached the set temperature while others are still
operating, the corresponding electronic expansion valve for that
particular unit will close completely after a five (5) second delay.
• The outdoor fan will turn off one (1) minute after the compressor shuts
off.
Outdoor Fan Operation: • The outdoor fan starts five (5) seconds before the compressor
starts running.
• The outdoor fan will run at high speed for forty (40) seconds
when it first starts, then it will run at a set speed. The fan will
run at each set speed for at least eighty (80) seconds.
• When the number of running indoor units is changed, the PC
board will change the outdoor fan accordingly.
• When the compressor stops, the outdoor fan runs at the last set
speed and then stop one (1) minute after.
Switching to “HEAT” mode: When all operating indoor units are switched from “COOL” to
“HEAT” mode, the compressor will turn off and wait three (3)
minutes before turning back on. The 4-way valve will open (on)
two (2) minutes after the compressor stopped.
9.1.2 “DRY” Mode
Temperature range: Same as “COOL” mode
4 way valve position: Same as “COOL” mode
On operation: Same as “COOL” mode
NOTE: The maximum capacity of “DRY” mode is 90% of that of “COOL” mode.
9.1.3 “FAN” Mode
Temperature range: 61~86°F
4 way valve position: Closed (Off)
On operation: • Indoor fan operates. Can be set to AUTO, HIGH, MED, or LOW.
• Compressor does not turn on
Outdoor Fan Operation: Off
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