SYSTEM
Part 3: Installation Requirements
3.1 Lineset
A. The connecting refrigerant lines between the indoor and outdoor units are to be supplied by the installer.
B. The tubing must be annealed ACR-type copper, meeting ASTM B280 standards.
C. The connecting tubing between the outdoor and indoor units shall be continuous in all possible situations.
D. Liquid and vapor tube sizes must match the indoor unit flare connections.
E. 9K and 12K outdoor units shall ship with 1/2 to 3/8 flare port adapter. This adapter must be used to connect outdoor
unit to approved matched indoor units with 3/8 vapor flare size.
F. The tubing ends must be reamed inside and out, and must be flared using a 45° flaring tool approved for R-410A.
G. Connections to the indoor and outdoor units shall be made with flare nuts that are supplied with the individual units.
H. The flare nuts must be attached to indoor and outdoor units using a torque wrench and
back -up wrench.
I. Each tube must be insulated with a minimum of 1/2 inch (12.7mm) closed-foam insulation that is UV resistant and
meets ASTM Standard E84 25/50 flame spread/smoke development.
J. The lineset between the indoor and outdoor must not exceed the listed maximum length and maximum height
difference. See chart below.
System Type
System Models
1U09EH2VHD / 1U09EH2VHE
AW09EH2VHD
1U12EH2VHD / 1U12EH2VHE
Wall Mount
AW12EH2VHD
1U18EH2VHD / 1U18EH2VHE
AW18EH2VHD
1U09EH2VHE
USYM09UCDSA
Mid-Static
1U12EH2VHE
Duct
USYM12UCDSA
1U18EH2VHE
USYM18UCDSA
1U09EH2VHE
USYF09UCDWA
1U12EH2VHE
Floor Console
USYF12UCDWA
1U18EH2VHE
USYF18UCDWA
1U09EH2VHE
AB09SC2VHA
1U12EH2VHE
Compact
AB12SC2VHA
Cassette
1U18EH2VHE
AB18SC2VHA
Part 4: Electrical Requirements
4.1 Electrical Supply
A. The operating electrical requirements shall be 208/230 volts AC, single-phase, 60 hertz. Voltage supplied to
the outdoor unit must be between 187-253 volts.
B. Power supply must be installed in accordance to NEC standards.
4.2 Connecting Wire to Indoor
A. Connecting cable between the indoor unit(s) must be made with 4 conductor - 14 AWG stranded copper wire.
B. Connecting wire must be continuous (without break) unless local code requires power disconnect next to
indoor unit. See indoor electrical section 3.1 for the specification.
31-5000585 Rev. 0
Pipe Size
Torque
1/4
12 lb/ft 16.3 Nm
0.327-0.343
3/8
27 lb/ft 36.6 Nm
0.472-0.488
1/2
40 lb/ft 54.2 Nm
0.488-0.654
5/8
50 lb/ft 67.8 Nm
0.732-0.748
3/4
80 lb/ft 108.5 Nm
0.902-0.917
Liquid
Vapor
Minimum Length
1/4 in
1/2 in
6ft (1.8m)
1/4 in
1/2 in
6ft (1.8m)
1/4 in
1/2 in
6ft (1.8m)
1/4 in
3/8 in*
6ft (1.8m)
1/4 in
3/8 in*
6ft (1.8m)
1/4 in
1/2 in
6ft (1.8m)
1/4 in
3/8 in*
6ft (1.8m)
1/4 in
3/8 in*
6ft (1.8m)
1/4 in
1/2 in
6ft (1.8m)
1/4 in
3/8 in*
6ft (1.8m)
1/4 in
3/8 in*
6ft (1.8m)
1/4 in
1/2 in
6ft (1.8m)
A (inch)
Flare Shape
A
Maximum Length
50ft (15m)
50ft (15m)
83ft (25m)
50ft (15m)
50ft (15m)
83ft (25m)
50ft (15m)
50ft (15m)
83ft (25m)
50ft (15m)
50ft (15m)
83ft (25m)
*Use 1/2 x 3/8 adapter shipped with outdoor unit
Maximum Height Difference
33ft (10m)
33ft (10m)
50ft (15m)
33ft (10m)
33ft (10m)
50ft (15m)
33ft (10m)
33ft (10m)
50ft (15m)
33ft (10m)
33ft (10m)
50ft (15m)
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