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Installation
CAH-SVX01A-EN 35
• 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.
Figure 35. Single-circuit evaporator coil with one distributor
Examples of Field-Installed
Evaporator Piping
Single-Circuit Condensing Units:
Evaporator Coil with One Distributor
(see Figure 35)
1 Pitch the liquid line slightly—
1 inch/10 feet [1 cm/3 m]—so that
the refrigerant drains toward the
evaporator.
2 Provide one expansion valve per
distributor.
3 Slightly pitch the outlet line from
the suction header toward the
suction riser—that is, 1 inch/
10 feet [1 cm/3 m] in the direction
of flow. Use the tube diameter
that matches the suction-header
connection.
4 For the vertical riser, use the tube
diameter recommended by the
condensing unit manufacturer.
Assure the top of the riser is
higher than the evaporator coil.
5 Arrange the suction line so the
refrigerant gas leaving the coil
flows downward, past the lowest
suction-header outlet, before
turning upward.
6 Pitch the suction line slightly—
1 inch/10 feet [1 cm/3 m]—so the
refrigerant drains toward the
evaporator.
7 Insulate the suction line.