Specifications

• If tubing is to be run underground, it must be run in a sealed watertight chase.
• Use care in routing tubing and do not kink or twist. Use a tubing bender on the
vapor line to prevent kinking.
• The vapor line must be insulated to prevent dripping (sweating) and prevent
performance losses. Armaflex and Rubatex are satisfactory insulations for this
purpose. Use 1/2” minimum insulation thickness, additional insulation may be
required for long runs.
• Check Table 2 for the correct vapor line size. Check Tables 4 and 5 for the cor-
rect liquid line size.
9.6 TUBING CONNECTIONS
Indoor evaporator coils have only a holding charge of dry nitrogen. Keep all tube
ends sealed until connections are to be made.
• Use type “L” copper refrigeration tubing. Braze the connections with accepted
industry practices.
• Be certain both refrigerant service valves at the outdoor unit are closed.
• Clean the fittings before brazing.
• Remove the cap and schrader core from service port to protect seals from heat
damage.
• Use an appropriate heatsink material around the copper stub and the service
valves before applying heat.
• IMPORTANT: Do not braze any fitting with the TEV sensing bulb attached.
• Braze the tubing between the outdoor unit and indoor coil. Flow dry nitrogen
into a service port and through the tubing while brazing.
• After brazing – use an appropriate heatsink material to cool the joint and
remove any flux residue.
9.7 LEAK TESTING
• Pressurize line set and coil through service fittings with dry nitrogen to 150 psig
maximum. Leak test all joints using liquid detergent. If a leak is found, repair
and repeat leak test procedures.
12
UNIT SIZE
Suction Line
Connection Size
TABLE 2
SUCTION LINE LENGTH/SIZE VS. CAPACITY MULTIPLIER (R-410A)
1
1
⁄2 Ton 2 Ton 2
1
⁄2 Ton 3 Ton 3
1
⁄2 Ton 4 Ton 5 Ton
3/4" [19] I.D. 3/4" [19] I.D. 3/4" [19] I.D. 3/4" [19] I.D. 7/8" [22.2] I.D. 7/8" [22.2] I.D. 7/8" [22.2] I.D.
Suction Line Run -
Feet [m]
5/8” [15.9]
3/4” [19]*
—
Optional
Standard
Optional
Optional
Standard
Optional
Optional
Standard
Optional
Optional
Standard
Optional
25’
[7.6]
50’
[15.24]
100’
[30.5]
150’
[45.7]
5/8” [15.9]
3/4” [19]* 3/4” [19]*
— 7/8” [22.2]
5/8” [15.9] —
3/4” [19]*
7/8” [22.2]
3/4” [19]
7/8” [22.2]*
—
—
7/8” [22.2]*
1
1
⁄8” [28.6]
—
1
1
⁄8” [28.6]
1.00 1.00 1.00 — 1.00 ——
1.00 1.00 1.00 1.00 1.00 1.00 1.00
——1.00 1.00 — 1.00 1.00
0.98 0.98 0.96 — 0.99 ——
0.99 0.99 0.98 0.98 0.99 0.99 0.99
——0.99 0.99 — 0.99 0.99
0.95 0.95 0.94 — 0.96 ——
0.96 0.96 0.96 0.96 0.98 0.96 0.97
——0.97 0.97 — 0.98 0.98
0.92 0.92 0.91 — 0.94 ——
0.93 0.94 0.93 0.94 0.96 0.95 0.94
——0.95 0.95 — 0.96 0.97
NOTES:
*Standard
Note: Using suction line larger than shown in chart will result in poor oil return and is not recommended.
7/8” [22.2]*
!
WARNING
DO NOT USE OXYGEN TO PURGE LINES OR PRESSURIZE SYSTEM FOR
LEAK TEST. OXYGEN REACTS VIOLENTLY WITH OIL, WHICH CAN
CAUSE AN EXPLOSION RESULTING IN SEVERE PERSONAL INJURY OR
DEATH.