Unit installation

3. LIMITATION OF REFRIGERANT PIPING LENGTH
CAUTION
The total maximum pipe lengths and height difference of
this product are shown in the table.
If the units are further apart than this, correct operation
cannot be guaranteed.
Total max. length (a+b+c+d) 70 m (230 ft)
*2
Max. length for each indoor unit
(A, B, C, or D)
25 m (82 ft)
Max. height difference (H) 15 m (49 ft)
Min. length for each indoor unit
(A, B, C, or D)
5 m (16 ft)
*2 If the total piping length is 51 m (167 ft) or longer, additional refrige-
rant charging is necessary. (For more information, refer to “2-6
ADDITIONAL CHARGE”.)
Total max. length (a+b) 30 m (98 ft)
Max. length for each indoor unit
(A or B)
25 m (82 ft)
Max. height difference (H) 10 m (33 ft)
Min. length for each indoor unit
(A or B)
5 m (16 ft)
36 type
24 type
4. SELECTING PIPE SIZES
The diameters of the connection pipes differ according to the capacity of
the indoor unit.
Refer to the following table for the proper diameters of the connection
pipes between the indoor and outdoor units.
9 – 12 ø9.52 mm (0.8 mm) (3/8" (1/32")) ø6.35 mm (0.8 mm) (1/4" (1/32"))
18 ø12.7 mm (0.8 mm) (1/2" (1/32")) ø6.35 mm (0.8 mm) (1/4" (1/32"))
Liquid pipe size
(thickness)
Capacity of
indoor unit
Gas pipe size
(thickness)
CAUTION
Operation cannot be guaranteed if the correct combina-
tion of pipes, valves, etc., is not used to connect the in-
door and outdoor units.
5. HEAT INSULATION AROUND CONNECTION
PIPES REQUIREMENTS
CAUTION
Install heat insulation around both the gas and liquid pipes.
Failure to do so may cause water leaks.
Use heat insulation with heat resistance above 248 °F. (Re-
verse cycle model only)
In addition, if the humidity level at the installation location
of the refrigerant piping is expected to exceed 70%, install
heat insulation around the refrigerant piping. If the ex-
pected humidity level is 70-80%, use heat insulation that
is 5.9 in. or thicker and if the expected humidity exceeds
80%, use heat insulation that is 7.9 in. or thicker.
If heat insulation is used that is not as thick as specified,
condensation may form on the surface of the insulation.
In addition, use heat insulation with heat conductivity of
0.045 W/(m·K) or less (at 68 °F).
Connect the connection pipes according to “2 CONNECTING THE
PIPING” in this installation instruction sheet.
6. ELECTRICAL REQUIREMENT
Always make the air conditioner power supply a special branch
circuit and provide a special switch and receptacle. Do not extend
the power cord.
CAUTION
24 type 36 type
MINIMUM CIRCUIT AMPACITY 17 A 25 A
MAXIMUM OVERCURRENT PROTECTION
20 A 30 A
(TIME DELAY FUSE OR HACR TYPE CIRCUIT BREAKER)