Heatcraft Refrigeration Products Air-Cooled Condensers none User Manual download pdf (Page 5)

Typical Arrangements

Figure 1 illustrates a typical piping arrangement involving a

remote condenser located at a higher elevation, as commonly

encountered when the condenser is on a roof and the compressor

and receiver are on grade level or in a basement equipment

room.

In this case, the design of the discharge line is very critical. If

properly sized for full load condition, the gas velocity might be

too low at reduced loads to carry oil up through the discharge

line and condenser coil. Reducing the discharge line size would

increase the gas velocity suciently at reduced load conditions;

however, when operating at full load, the line would be greatly

undersized, and thereby 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.

2. A double riser discharge line may be used as shown in

Figure 2. Line “A” should be sized to carry the oil at minimum

load conditions and the line “B” should be sized so

that at the full load conditions both lines would have

sucient ow velocity to carry the oil to the condenser.

For more complete information, refer to the ASHRAE Handbook

on Systems.

Figure 1

Figure 2

Notes:

1. All oil traps are to be as short in radius as

possible. Common practice is to fabricate the

trap using three 90 degrees ells.

2. Pressure relief valves are recommended at the

condenser for protection of the coil.

3. A drain line check valve is recommended for

applications where the condenser may be at a

lower temperature than the receiver.

Installation, Refrigerant Piping

Install piping according to standard accepted refrigeration

practice. The following recommendations should be adhered to:

1. See Tables 1 and 2 for discharge and liquid

drain line sizes for remote condenser

connections.

2. Use only refrigeration grade copper tubing.

3. Soft solder joints are not acceptable.

4. Put dry nitrogen through lines while brazing.

5. Do not leave dehydrated piping or components

open to the atmosphere any longer than is

absolutely necessary.

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Heatcraft Refrigeration Products Air-Cooled Condensers none User Manual Page 5

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