Installation
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(6) Thermal insulation layer shall be stuck on air delivery ducts and no leakage shall exist at
connections.
2. Recommended cross sectional area of air ducts
Model FR(D)95 FR(D)125/S FR(D)180/S FR(D)260/S FR(D)71-B FR(D)100-B
Return air duct CS area (m
2
)
≥0.3 ≥0.4 ≥0.6 ≥0.7 ≥0.225 ≥0.3
Air delivery duct CS area (m
2
)
≥0.135 ≥0.15 ≥0.27 ≥0.325 ≥0.101 ≥0.135
Note: FRD23-B, FRD35-B and FRD50-B can be directly connected to air delivery/return
ports via soft connection. Refer to indoor unit installation dimensions for size of air
delivery/return ports.
3. Arrangement of fresh air port
Based on FRD23-B, FRD35-B and FRD50-B
One 100×100 bottom fresh air port is provided at side and bottom face of FRD23-B,
FRD35-B and FRD50-B respectively.
Arrangement of fresh air port in FR95-C and FR125-C/S is the same as in FRD23-B,
FRD35-B and FRD50-B, and one fresh air port is provided at each side of the unit and can be
open to needs.
Refer to installation mode 3 for fresh air port arrangement for FR(D)95, FR(D)125/S,
FR(D)71-B, FR(D)100-B, FR(D)180/S and FR(D)260/S.
Precautions for arrangement of fresh air ports:
a. Requirement on fresh air damper: Closing of fresh air damper shall be tight and fresh air
flow shall be adjustable;
b. Requirements on fresh air port: Fresh air port shall be arranged upstream of air exhaust port
as much as possible, and lower than air exhaust port. Fresh air port shall be arranged on north
wall as much as possible and height of its bottom above outdoor floor should be not smaller
than 2m, and not smaller than 1m when arranged in afforestation area. Strainer shall be
provided at inlet of fresh air to purify outdoor air and improve indoor air quality.
Rear air return
(vertical view)
Fresh air
Return air
Delivery air
Fresh air
Lower air return
Fresh air port
Air delivery port
Return air port
One fresh air port at left side, right side and rear (bottom) side
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