Heatcraft Refrigeration Products 2500018 warranty Typical Piping Arrangements

Remote Air-Cooled Condenser

Leg Assembly for Horizontal Airflow Installation (Models 024-133; 5-26)

Figure 6. Leg assembly (horizontal airflow, models 024-133; 5-26)

1. Remove bolts securing condenser to skid.

. Remove item 1 and attach to rear of bottom leg (item A) to complete mounting base. Item 2 is not required in the horizontal discharge application and may be discarded.

3.Condenser can be hoisted by the 1-1/2” holes in leg assemblies.

Typical Piping Arrangements

Figure 7 illustrates a typical piping arrangement with a remote condenser located at a higher elevation, common when the condenser is on a roof and the compressor and receiver are on grade level or in a basement equipment room.

Figure 7

In this case, the design of the discharge line is very critical. If properly sized for full load conditions, the gas velocity might be too low at reduced loads to carry oil through the discharge line and condenser coil. Reducing the discharge line size would increase the gas velocity sufficiently at reduced load conditions; however, when operating at full load, the line would be greatly undersized and create an excessive refrigerant pressure drop.

This condition can be overcome in one of two following ways:

1.The discharge line may be properly sized for the desired pressure drop at full load conditions and an oil separator installed at the bottom of the trap in the discharge line from the compressor.

. A double riser discharge line may be used as shown in Figure 8. Line A should be sized to carry the oil at minimum load conditions and Line B should be sized so that at full load conditions, both lines would have sufficient flow velocity to carry the oil to the condenser.

Figure 8

For more complete information, please refer to the ASHRAE Handbook on Systems.

NOTES:

1� All oil traps are to be as short in radius as possible. Common practice is to fabricate the trap using three 90-degree ells.

2� Pressure relief valves are recommended at the condenser to protect the coil.

3� A drain line check valve is recommended for applications where the condenser may be at a lower temperature than the receiver.

See Tables 1, 2, and 3 for discharge and liquid drain line size recommendations for remote condenser selections.

Installation, Refrigerant Piping

Install piping according to standard accepted refrigeration practice. The following recommendations should be adhered to:

1.Use only refrigeration-grade copper tubing. . Soft solder joints are not acceptable.

3.Put dry nitrogen through lines while brazing.

4.Do not leave dehydrated piping or components open to the atmosphere any longer than is necessary.

Remote Air-Cooled Condenser Installation and Operations Manual, August 2007 5