88 CLCH-SVX07C-EN
Coil Piping and Connections
formation (adversely affecting indoor air quality). After operating the system and testing all fittings
and joints to verify the system is leak-free, insulate the suction lines all the way to inner side panel
to prevent heat gain and unwanted condensation.
Components
Installing the suction line requires field installation of these components: a filter, access port, and
a Frostat™ control when the refrigerant coil is used with Trane condensing units. Position them as
close to the compressor as possible.
Note: Placement of the Frostat control is illustrated in Figure 76 on page 85.
• Filter. The suction filter prevents contaminants, introduced during installation, from entering
the compressor. For this reason, the suction filter should be the replaceable-core type, and a
clean core should be installed after the system is cleaned up.
• Access port. The access port is used to determine suction pressure. This port is usually a
Schraeder valve with a core.
• Frostat™ coil frost protection. The Frostat control is the preferred method for protecting
evaporator coils from freezing when the refrigerant coil is used with Trane condensing units.
It senses the suction-line temperature and temporarily disables mechanical cooling if it detects
frost conditions. The control is mechanically attached to the outside of the refrigerant line, near
the evaporator, and wired to the unit control panel.
• Ball shutoff valve. Adding manual, ball-type shutoff valves upstream and downstream of the
filter simplifies replacement of the filter core.
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