!WARNING
DO NOT USE OXYGEN TO PURGE LINES OR PRESSURE SYSTEM FOR LEAK TEST . OXYG EN REACTS VIOLENTLY WITH OIL, WHICH CAN CAUSE AN EXPLOSION RESULTING IN SEVERE PERSONAL INJURY OR DEATH.
FIGURE 5
LIQUID LINE PRESSURE DROP PER 100 FEET EQUIVALENT LENGTH (TYPE L COPPER TUBING)
NOTES:
1.When evaporator coil is above condenser, the pressure drop due to vertical lift (.5 PSIG per foot of lift) must be added to the pressure drop derived from this curve.
2.Size liquid line for no more than 10°F loss (approximately 50 PSIG total pressure drop).
3.Do not oversize liquid line. Oversized liquid lines add significantly to the amount of refrigerant required to charge the system.
4.The maximum recommended velocity with solenoid valves or other quick closing devices in the liquid line is 300 FPM.
A. INSTALLATION OF PIPING
Once located, the condensing unit is ready to be interconnected with the evaporator using ONLY refrigeration grade dehydrated tubing. The following should be considered when connecting the tubing.
1.Pitch the suction line toward the compressor approximately 1⁄2 inch every 10 feet to facilitate oil return.
2.It is recommended that the sight glass, filter drier and liquid line solenoid valve be installed in the liquid line just prior to the evaporator.
3.Silver solder (such as silfos, Easy Flow, etc.) should be used for all refrigerant joints.
4.Thoroughly clean all joints before fluxing. DO NOT USE ACID FLUX.
5.When fluxing, limit the application of paste to the minimum and always apply flux to the male portion of the connection.
6.Suction lines should be insulated to prevent condensate drip. Use insulation of at least 3⁄8 inch wall thickness. The insulation should be installed on the tubing prior to making the sweat connections.
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