10
Specifications subject to change without notice. 38MAR-04SI
Step 4 - Refrigerant Piping
Table 6 — Piping and Refrigerant Information
IMPORTANT: Both refrigerant lines must be insulated
separately. Use refrigeration grade tubing ONLY. No other
type of tubing may be used. Use of other types of tubing
will void the manufacturer's warranty.
• The minimum refrigerant line length between the indoor and
outdoor unit is 10 ft. (3m).
• When paired with Ductless indoor units, size the line sets based on
the connection size of the indoor unit unless specified.
• When paired with conventional or multi-family fan coils, size the
line sets based on the liquid and gas connection size of the outdoor
unit; a field supplied reducer may be required.
• All outdoor units have an electronic expansion valve to manage the
refrigerant flow of the fan coil connected.
• Do not open the service valves or remove the protective caps from
the tubing ends until all connections are made.
• Bend the tubing with bending tools to avoid kinks and flat spots.
• Keep the tubing free of dirt, sand, moisture, and other
contaminants to avoid damaging the refrigerant system.
• Avoid sags in the suction line to prevent the formation of oil traps.
• Insulate each tube with a minimum 3/8-in. (10 mm) wall thermal
pipe insulation. Inserting the tubing into the insulation before
making the connections will save time and improve installation
quality.
SIZE
12K
(115V)
9K
(208/230V)
12
(208/230V)
18K
(208/230V)
24K
(208/230V)
30K
(208/230V)
36K
(208/230V)
Piping
Min. Piping Length
Ft (m)
10 (3)
10 (3)
10 (3)
10 (3)
10 (3)
10 (3)
10 (3)
Standard
Piping Length
Ft (m)
25 (7.5)
25 (7.5)
25 (7.5)
25 (7.5)
25 (7.5)
25 (7.5)
25 (7.5)
Max. Outdoor indoor
height difference
Ft (m)
32 (10)
32 (10)
32 (10)
65 (20)
65 (20)
82 (25)
82 (25)
Max. Piping Length
with no additional
refrigerant charge
Ft (m)
26 (8)
26 (8)
26 (8)
26 (8)
26 (8)
26 (8)
26 (8)
Max. Piping Length
Ft (m)
82 (25)
82 (25)
82 (25)
98 (30)
164 (50)
164 (50)
164 (50)
Additional refrigerant charge
(between Standard – Max
piping length)
Oz/ft (g/m)
0.16 (15)
0.16 (15)
0.16 (15)
0.16 (15)
0.32 (30)
0.32 (30)
0.32 (30)
Gas Pipe
in
1/2
3/8
1/2
1/2
5/8
5/8
5/8
(mm)
12.7
9.52
12.7
12.7
16
16
16
Liquid Pipe
in
1/4
1/4
1/4
1/4
3/8
3/8
3/8
(mm)
6.35
6.35
6.35
6.35
9.52
9.52
9.52
Refrigerant
Refrigerant Type
-
R410A
R410A
R410A
R410A
R410A
R410A
R410A
Charge Amount
Lbs
(kg)
2.76 (125)
3.31 (1.5)
3.31 (1.5)
4.30 (1.95)
5.73 (2.60)
6.06 (2.75)
7.50 (3.40)
All field piping must be completed by a licensed technician and
must comply with the local and national regulations.
When the system is installed in a small room, measures must be
taken to prevent the refrigerant concentration in the room from
exceeding the safety limit in the event of refrigerant leakage. If the
refrigerant leaks and its concentration exceeds its proper limit,
hazards due to lack of oxygen may result.
When installing the refrigeration system, ensure that air, dust,
moisture or foreign substances do not enter the refrigerant circuit.
Contamination in the system may cause poor operating capacity,
high pressure in the refrigeration cycle, explosion or injury.
Ventilate the area immediately if there is refrigerant leakage
during the installation.
Leaked refrigerant gas is hazardous. Ensure there is no refrigerant
leakage after completing the installation work.
WARNING
DO NOT
install the connecting pipe until both the indoor and
outdoor units have been installed.
Insulate both the gas and liquid piping to prevent condensation.
CAUTION
