CLCH-SVX06A-EN •
T-Series Climate Changer Air Handler IOM
59
Installation - Piping
CAUTION
Valve Damage!
Disassemble the thermal expansion valve before completing the brazing connections.
If necessary, wrap the valve in a cool, wet cloth while brazing. Failure to protect the
valve from high temperatures may result in damage to internal components.
Suction Lines
Line sizing. Proper suction-line sizing is required to guarantee the oil returns to the
compressor throughout the system’s operating envelope. At the same time, the line must
be sized so that the pressure drop does not excessively affect capacity or efficiency. To
accomplish both objectives, it may be necessary to use two different line diameters: one
for the horizontal run and for vertical drops, and another for the vertical lifts.
Routing. To prevent residual or condensed refrigerant from “free-flowing” toward the
compressor, install the suction line so it slopes slightly—that is, by ¼ inch to 1 inch per
10 feet of run [1 cm per 3 m]—toward the evaporator. When the application includes a
suction riser, oil must be forced to travel the height of the riser. Riser traps and double
risers are unnecessary in the suction line when the refrigerant coil is used with Trane
condensing units.
Avoid putting refrigerant lines underground. Refrigerant condensation or installation
debris inside the line, service access, and abrasion/corrosion can quickly impair
reliability.
The thermal expansion valve must be
selected for proper size and capacity.
The size of the expansion valve should
cover the full range of loadings. Check
that the valve will successfully operate
at the lightest load condition. For
improved modulation, choose
expansion valves with balanced port
construction and external equalization.
Cut the process tube and cap assembly
from the liquid connection as shown in
Figure 45
and install the expansion
valve directly to the liquid connections.
Figure 45. Type F refrigerant coil with packed elbow
Cut here
for piping
Perforated plate
(packed elbow)
Panel
Venturi type
distributor
Coil
