10
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.
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.
!
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.
TABLE 3
VAPOR LINE LENGTH SIZE AND CAPACITY MULTIPLIER
18 24 30 36 42 48 60
Opt. .98 — — .99 — .99 .99
0’ - 25’ Std. 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Opt. 1.01 1.01 1.01 1.01 1.01 1.01 1.01
Opt. .96 — — .97 — .97 .97
26’ - 50’ Std. .99 .99 .98 .99 .99 1.00 .99
Opt. 1.00 1.00 1.00 1.01 1.01 1.01 1.0
Opt. .93 — — .93 — .96 .95
51’ - 100’ Std. .98 .97 .96 .98 .98 .99 .99
Opt. .99 .99 .99 1.00 1.00 1.00 1.00
Opt. — — — — — .93 .93
101’ - 150’ Std. .97 .95 .93 .97 .96 .99 .98
Opt. .98 .97 .97 .99 .99 1.00 .99
Suction Line Run Feet
NOTES:
1) Capacity Multiplier x Rated Capacity = Actual Capacity.
2) Additional Compressor oil is not required for runs up to 150 feet.
3) Oil traps in vertical runs are not required for any height up to 125 feet. See Liquid Line chart for Vertical
Separation Requirements and Limitations.
4) Actual suction line connection size is 7/8". Adapter to 1-1/8" is factory supplied.
5/8” O.D. Optional
3/4” O.D. Standard
7/8” O.D. Optional
3/4” I.D. Sweat
3/4” O.D. Optional
7/8” O.D. Standard
1-1/8” O.D. Optional
7/8” I.D. Sweat
7/8” I.D.
Sweat (4)
7/8” O.D. Optional
1-1/8” O.D. Standard
1-3/8” O.D. Optional
Suction Line
Connection Size
Cooling
Capacity
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