CLCH-SVX07C-EN
91
Coil Piping and Connections
Single-Circuit Condensing Unit: Evaporator Coil with Four Distributors
Figure 80. Single-circuit evaporator coil with four distributors
1.
Pitch the liquid line slightly—1 inch/
10 feet —so 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 in the
direction of flow. Use the tube diameter
that matches the suction-header
connection.
4. Arrange the suction line so the
refrigerant gas leaving the coil flows
downward, past the lowest suction-
header outlet, before turning upward.
Use a double-elbow configuration to
isolate the thermal expansion valve
bulb from other suction headers.
5. For horizontal tubing, use the tube
diameter recommended by the
condensing unit manufacturer.
6. 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.
7.
Pitch the suction line slightly—1 inch/
10 feet —so the refrigerant drains
toward the evaporator.
8. Insulate the suction line.
9. Only use a “trim” solenoid valve for
constant-volume, humidity-sensitive
applications. For all other applications,
install a single solenoid valve (the
“pumpdown” solenoid valve) between
the liquid-line filter drier and the sight
glass.
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