Coil Piping and Connections
42
CLCH-SVX009A-EN
Figure 38.
Dual-circuit condensing unit: evaporator coil with four distributors
1.
Pitch the liquid line slightly—1 inch/10 feet —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— 1 inch/10 feet
in the direction of flow. Use the tube diameter
that matches the suction-header connection.
4. This looks like a drain trap, but is actually due to
the requirement that the refrigerant gas leaving
the coil flows downward, past the lowest
suction-header outlet, before turning upward.
Use the double-elbow configuration to isolate
the TXV bulb from other suction headers.
5. Use the “horizontal” tube diameter as specified
in the condensing unit application manual.
6. Use the tube diameter recommended for a
vertical rise as specified in the condensing unit
application manual. Ensure that the top of the
riser is higher than the evaporator coil.
7.
Pitch the suction line slightly—1 inch/10 feet —
so that the refrigerant drains toward the
evaporator.
8. Insulate the suction line.
9. The top of the Circuit 1 suction riser must be
higher than the bottom evaporator coil. Use the
tube diameter recommended for a vertical rise
as specified in the condensing unit application
manual.
10. The top of the Circuit 2 suction riser must be
higher than the top evaporator coil. Use the tube
diameter recommended for a vertical rise as
specified in the condensing unit application
manual.
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