Discharge Lines - Data Aire gForce Ultra User Manual

The chart covers distances up to 200 equivalent feet (61 m). For installations beyond
this distance, consult ASHRAE or similar references.
Note:
and efficient operation. The interconnecting lines to the remote air cooled
condenser or condensing unit must be installed by a qualified refrigeration
mechanic.

2.7.2 Discharge Lines

Discharge lines, also called hot gas lines, should be trapped at the top (inverted) and
bottom as well as every 15 to 20 feet (4.6 to 6.1 m) of vertical rise. Discharge check
valves (field provided) are recommended on all installations, especially those where
there are long pipe runs or cold climates. Check valves should be installed no less than
six (6) to ten (10) feet (1.8 to 3.1 m) from the compressor. The evaporator section
ships with a nitrogen holding charge. Do not vent the evaporator until all refrigerant
piping is in place, ready for connection to the evaporator and condenser.
discharge, suction and liquid lines need to be refrigerant grade copper and in
accordance with local code.
temperature brazed joints. When brazing, a supply of nitrogen gas needs to be fed
through the refrigerant lines. Be sure to open the other end of the refrigerant line to
allow the nitrogen to bleed off and not pressurize the piping.
refrigeration practices should be employed for piping support, leak testing, dehydration
and charging the refrigerant circuits. During the installation, the lines should be capped
off and filled with dry nitrogen at the end of each day's work or until the system is
completed and sealed.
Data Aire recommends a silver/phosphorus/copper alloy with 5 to 15% silver be used to
braze the refrigerant line sets to the indoor and outdoor units. Nitrogen needs to be
flowing through the lines to eliminate carbon deposit build-up on the inside of the
joints. Carbon could contaminate the refrigerant and restrict the metering device.
Piping must be supported within 18" (457 mm) of the inlet and outlet connections
external to the unit. Internal to the unit, the inlet connection is located on the top
header of all units. The discharge outlet is located at the bottom of the header.
Discharge line pressure should not exceed 9 PSI (62 kPa) for R-410A. Recommended
gas velocity for proper oil return is 1,000 FPM (5.1 m/sec).
downward in the direction of the refrigerant flow. The recommended slope is 1/2" (12
16 ● gForce Ultra User Manual
Standard piping practice must be used to ensure proper oil return
All refrigeration piping should be installed with high
The
Prevailing good
Slope horizontal lines
10-2014