CLCH-SVX03C-EN 57
Coil Piping and Connections
Liquid Lines
Line Sizing. Properly sizing the liquid line is critical to a successful split-system application. The
selected tube diameter must provide at least 5°F [2.7°C] of subcooling at the expansion valve
throughout the operating envelope. Increasing the size of the liquid line will not increase the
available subcooling.
Routing. Install the liquid line with a slight slope in the direction of flow so that it can be routed
with the suction line. Minimize tube bends and reducers because these items tend to increase
pressure drop and to reduce subcooling at the expansion valve. Liquid line receivers, other than
those that are factory-installed, are not recommended.
Insulation. The liquid line is generally warmer than the surrounding air, so it does not require
insulation. In fact, heat loss from the liquid line improves system capacity because it provides
additional subcooling.
Components. Liquid-line refrigerant components necessary for a successful job include a filter
drier, access port, solenoid valve, moisture-indicating sight glass, expansion valve(s), and ball
shutoff valves. Figure 54 illustrates the proper sequence for positioning them in the liquid line.
Position the components as close to the evaporator as possible.
Figure 54. Example of placement for split-system components
Discharge
line
Manual
ball valve
Access
port
Filter
Access
port
Access
port
Filter drier
with access
port
Manual
angle valves
Check/relief
valve
Condensing unit
Condenser and
sbucooler coil
Compressors
Liquid line
Access
port
Manual
ball valve
Solenoid
valve
Moisture-
indicating
sight glass
Expansion
valves
Evaporator coil
Distriburtor
Manual ball valve
Suction lineFrostat™ control
Manual
ball valve
Kit with sensor - X13790452010 SEN-01212
Kit with switch - X13100429010 THT 02442
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