Refrigerant Piping Procedures Outdoor Units

Installation

Note: Insulate all refrigerant piping and connections.

Refrigerant Piping Procedures (Outdoor Units)

Each CTA unit ships with a holding charge of dry nitrogen. The nitrogen should be removed and the entire sys- tem evacuated (at the proper time) to avoid possible contamination.

1.Remove the service access panel.

2.Locate the liquid and discharge lines. Check that the piping connec- tion stubs on the valves (Figure 6) line up properly with the holes in the unit cabinet.

Figure 6

3.Locate the gauge ports on the dis- charge and liquid lines. Depress the valve core to release the nitrogen from the unit.

Note: If nitrogen is not released from the unit, there is a leak in the system. Locate the leak and repair before pro- ceeding with the installation.

4.Unbraze the tube seal caps to reveal the line braze connections.

WARNING:

Hazardous Pressures!

Coil has a nitrogen holding charge. Do not remove seal caps by heating the caps while coil is under pressure. Depress the gauge port valve cores to gradu- ally relieve nitrogen holding charge. Remove valve cores before removing the tubing seal caps. Failure to properly relieve pressure could result in death or serious injury.

CAUTION:

Equipment Damage!

Do not remove the seal caps from refrigerant connections until pre- pared to braze refrigerant lines to the connections. Excessive expo- sure to atmosphere may allow moisture or dirt to contaminate the system, damaging valve seals and causing ice formation in sys- tem components.

5.Cut, fit and braze tubing, starting at the outdoor unit and work toward the indoor unit.

Note: Use long radius bells for all 90 degree bends.

All brazing should be done using a 2 to 3 psig dry nitrogen purge flowing through the pipe being brazed (Figure 6).

WARNING:

Hazardous Pressures!

When using dry nitrogen cylin- ders for pressurizing units for leak testing, always provide a pressure regulator on the cylinder to prevent excessively high unit pressures. Never pressurize unit

above the maximum recom- mended unit test pressure as specified in applicable unit litera- ture. Failure to properly regulate pressure could result in a violent explosion, which could result in death or serious injury or equip- ment or property-only-damage.

CAUTION:

Equipment Damage!

Wet-wrap all valves and protect painted surfaces from excessive heat. Heat can damage system components and the unit finish.

6.Shut off nitrogen supply.

7.Shut off the manifold valve for the line that is connected to the dis- charge line gauge port.

Figure 7

Refrigerant Piping Procedure (Indoor Unit)

Once liquid and discharge lines are complete to the refrigerant connec- tions on the indoor unit, depress the gauge port valve cores on the suction and discharge lines to gradually relieve nitrogen holding charge.

PKG-SVX17A-EN

PKG-SVX17A-EN specifications

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