■ Concealed-Duct Type (U Type)
3-18. Required Minimum Space for Installation and
Service
● This air conditioner is usually installed above the ceiling so
that the indoor unit and ducts are not visible. Only the air
intake and air outlet ports are visible from the unit bottom.
● The minimum space for installation and service is shown in
Fig. 3-61-1 and Table 3-3-1.
Table 3-3-1
Type
12, 16, 18
A (Length)
780
Number of
2
duct flanges
● It is recommended that space be provided (450 × 450 mm)
for checking and servicing the electrical system.
● The detailed dimensions of the indoor unit is shown in Fig.
3-62-1 and Table 3-4-1.
(Suspension bolt pitch)
25
115
85
25
25
36, 48, 60
1,080
3
185
(Ceiling opening dimension)
580
100
630
25
10
70 30
160
190
Min. 250
or more
Unit: mm
1,560
4
25
260
A (O.D)
55
200
275
10
88
Fig. 3-62-1
27
A (Suspension bolt pitch)
Indoor unit
Air outlet duct flange
55
10
Electrical
component box
Inspection
access
450 × 450
Refrigerant
tubing
Min. 650 or more
Unit: mm
Fig. 3-61-1