YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
YMGI: Your Modern Green Idea
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Step 2:
Judge whether the operating noise of the compressor is normal, and whether there is a sharp noise or obvious
scraping. If there is a normal compressor working nearby, compare their operating noise.
Step 3:
Examine whether the electronic expansion valve of the outdoor unit is active and whether the 4-way valve works or
not. How to examine:
1) Electronic expansion valve:
The electronic expansion valve will be reset every time when the unit is powered on or off. Touch the valve and
you can feel the movement of the valve spool. In the last stage of the reset process, you will hear the click of the
valve and feel its vibration.
Touch the electronic expansion valve:
a. Touch the top of the electronic expansion valve and you can feel its move as it is reset upon
startup.
b. Make sure the coil is fixed firmly.
2)
4-way valve:
During normal operation, the 4 copper tubes that connect to the valve will have different temperature. When the 4-
way valve is working, it will generate some noise and vibration.
