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Table 7. Refrigerant Line Set Requirements
OUTDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
INDOOR UNIT
Maximum Line Set
Length
Maximum Line Set
Length
Maximum
Elevation -
Outdooor
Unit BELOW
Indoor Unit
Maximum
Elevation -
Outdooor
Unit ABOVE
Indoor Unit
Minimum Line Set
Length - 10 ft. (3m)
Minimum Line Set
Length - 10 ft. (3m)
Outside Unit BELOW Indoor Unit Outside Unit ABOVE Indoor Unit
Do not allow for excess length of line sets to be left rolled up as part of the
required distance, or in general. This will also cause additional performance issues.
IMPORTANT
Each system size has a line set length and vertical elevation parameters.
System Size (KBtu)
Line Set Diameters (in.)
Maximum Elevation
Outdoor Unit BELOW
Indoor Unit - Feet
(Meter)
Maximum Elevation
Outdoor Unit ABOVE
Indoor Unit - Feet
(Meter)
Maximum Line
Set Length - Feet
(Meters)
Liquid Gas
006, 009 1/4 3/8 40 (12) 40 (12) 82 (25)
012 1/4 1/2 40 (12) 40 (12) 82 (25)
018 1/4 1/2 66 (20) 66 (20) 98 (30)
024/030 3/8 5/8 82 (25) 82 (25) 164 (50)
Leak Test and Evacuation
Air and moisture remaining in the refrigerant system will
have undesirable effects as indicated below:
• Pressure in the system rises
• Operating current rises
• Cooling or heating efciency drops
• Moisture in the refrigerant circuit may freeze
• Water may lead to corrosion of parts in the refrigera-
tion system
The line set between the indoor and outdoor
units must be leak tested and evacuated to re-
move any non-condensables and moisture from
the system.
Leak Test
Use the following procedure to test for system
leaks:
1. Connect the manifold gauge set and dry nitrogen gas
cylinder to the suction and gas service ports.
2. Open valve on nitrogen cylinder.
3. Pressurize the system per the pressure test
specications in “Table 8. Pressure Test Specications”.
4. Check that the system pressure remains stable. If
there is any movement check system for leaks.
5. After the system is found to be free of leaks:
• Close valve on nitrogen cylinder
• Relieve the nitrogen pressure by: loosening the
charge hose connector at the nitrogen cylinder
• When the system pressure is reduced to normal,
disconnect the hose from the cylinder
Table 8. Pressure Test Specications
Bar Psig kPa Duration
1 3 44 303 Minimum of 10 minutes
2 15 220 1517 Minimum of 10 minutes
3 32 470 3241 Minimum of 10 minutes
4 45 650 4482
1 hour. Stress test to prove the
integrity of the complete installation.
5 32 470 3241
24 hours. Lower system pressure
test, after conrmation No. 4 was
successfully completed.
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