Section IV - Refrigerant Piping
A. Purpose
1. Liquid line - The purpose of the liquid refrigerant line is to convey refrigerant, in the liquid state, from
the outdoor unit to the indoor unit in the cooling mode and from the indoor unit to the outdoor unit in the
heating mode.
2. Gas line - The purpose of the gas line is to convey refrigerant in the gas state and oil from the indoor
unit to the outdoor unit in the cooling mode and from the outdoor unit to the indoor unit in the heating
mode.
B. Limitations:
1. The Allegiance / Heritage 18 utilizes two compressors that share the same refrigeration circuit, how
ever, do not operate simultaneously. Therefore, it is crucial that refrigerant lines are properly sized and do
not exceed the length set forth in the unit’s installation manual.
2. Line length limits:
A. Gas line = 80 feet linear length / of the linear length, 25 feet may be installed vertical.
B. Liquid line = 80 feet linear length / of the linear length, 25 feet may be installed vertical.
3. No exceptions shall be allowed to these piping limitations.
C. Explanation:
1. Refrigerant lines shall not exceed 80 feet total line length. / 25 feet of the 80 feet may be vertical. .
2. Liquid subcooling can not be achieved on first stage if the liquid line exceeds 80 feet / 25 feet vertical.
3. Insufficient oil return during first stage operation if the gas line exceeds 80 feet / 25 feet vertical.
D. For greater detail regarding refrigerant piping refer to Publication 32-3009-* (latest version)
25 Ft. Max
55 Ft. Max
80 Feet Max.
55 Ft. Max
25 Ft. Max
vertical
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Summary of Contents for 2A6H8030A
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