Typical case analysis
- 113 -
face.
Case XIV: In installation company installed one FR71-B air duct type air conditioner. Main
unit was installed in office. As limited by decoration structure, no air duct was used for indoor
unit and direct lateral air exhaust was used. Noise of air flow was too high.
Analysis:
(1) Sectional size of return air box was too small and air speed too high;
(2) Right angle bent connection used between main unit and air delivery hose.
Solution:
(1) Remove return air box, increase air return cross sectional area and lower air speed;
(2) Use arc transition connection between air delivery hose and main unit to reduce resistance.
Case XV: A user installed one FR260/S air duct type air conditioner. Main unit air delivery
port had high noise.
Analysis:
(1) Fixing of indoor unit did not follow instruction manual requirements;
(2) Distance between return air box and ceiling was only 12cm and return air space was too
small.
(3) Static pressure box was not installed.
Solution:
(1) Re-fix indoor unit to instruction manual requirements;
(2) Remove return air box to increase return air space;
(3) Install static pressure box and use sagging sponge inside for noise reduction;
(4) Use cotton felt for noise reduction of indoor unit.
Note:
1. For relevant models and parameters provided in this manual, actual products and nameplate
information shall govern;
2. This manual has been carefully checked. In case of printing error, our company shall not
bear responsibility for the consequences.
3. Our company is in constant technology advancement and product series and sizes will be
adjusted from time to time. Please note information of our new products.
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