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9.1.4 “HEAT” Mode
Temperature range: 61~86°F
4 way valve position: Open (On)
On Operation: • The compressor will only start running when any of the indoor units call
for heating 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 maintain a certain opening angle to make sure that
the refrigerant in the coil can be returned to the compressor.
• The outdoor fan will turn off one (1) minute after the compressor shuts
off.
• The 4 way valve will close (turn off) two (2) minutes 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 “COOL” Mode: When all operating indoor units are switched from “HEAT” to
“COOL” mode, the compressor will turn off and wait three
(3) minutes before turning back on. The 4-way valve will
close (off) two (2) minutes after the compressor stopped.
Defrost Function: • This feature will activate according to specific conditions for the
indoor/outdoor ambient and outdoor coil temperatures.
• “H1” code will be displayed on the indoor unit display or wall
control.
• Unit will exit defrost mode after outdoor coil temperature reaches
50°F or the maximum defrost time has passed (generally 7-10
minutes).
Oil Return Function: • Same as “Defrost Function”
• Maximum duration is five (5) minutes instead of 7-10 minutes.
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