Installation
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4. Connection of air delivery duct with the unit
Soft connection (canvas etc.) shall be used between air delivery duct and the unit. Refer to
indoor unit installation dimensions for air delivery port dimensions.
Based on FR(D)95
5. Connection of return air duct with the unit
(1) Soft connection (e.g. canvas) shall be used between return air duct and the unit;
(2) For FR(D)95, FR(D)125/S, FR(D)180/S and FR(D)260/S, it is necessary to remove
retaining strips on both sides of indoor unit return air port strainer;
(3) Use tapping screws or rivets to connect return air duct to indoor unit return air port.
Control depth of drilling for tapping screws to avoid penetrating evaporator copper tube or
condensate tray;
(4) For FRD23-B, FRD35-B, FRD50-B, FR(D)71-B and FR(D)100-B, a segment of canvas
air duct can be fabricated and reinforced by 8
＃
iron wire. This shall be folded, and have one
end connected to indoor unit air exhaust via rivet and the other end connected to return air
louver or strip return air port, so that free adjustment can be made according to height of
indoor ceiling. Return air grating with washable air strainer must be installed to prevent dust
from entering the unit. Recommended distance between return air port edge and wall is above
150mm.
(5) Return air duct installation mode for FR95-C and FR125-C/S is the same as for FRD23-B,
FRD35-B, FRD50-B, FR(D)71-B and FR(D)100-B. 3 return air modes can be adopted: upper
air return, lower air return and rear air return. Return air mode selection depends on unit
installation mode and return air duct installation mode;
(5) Canvas soft connection is adopted for air delivery port, air return port and main unit. No
tensile force shall exist between air duct and main unit; otherwise noise level will be higher.
⑥
Note
: For FR(D)95, FR(D)125/S, FR(D)180/S and FR(D)260/S, strainer with mesh
similar to unit strainer shall be fitted at end return air grating; otherwise a 70~100mm wide
area on lower side face at connection between return air duct and indoor unit shall be
removable, so that user can directly withdraw unit strainer for cleaning (as shown in the figure
below). If return air port is complete with strainer, we recommend that indoor unit strainer be
removed.
Air delivery duct fixing holes
Summary of Contents for -B
Page 38: ...Main technical parameters 36 3 Value in is nominal value for auxiliary electric heating...
Page 43: ...Circuit diagrams 41 Chapter V Circuit diagrams I Circuit diagrams...
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