14 UV-PRC001-EN
Direct Expansion Main Coils
Direct Expansion Main Coils
All refrigerant coils (Table 11 and
12) include a factory mounted
thermal expansion valve and
equalizing tube. The direct expan-
sion (DX) configuration is avail-
able in a left hand cooling
configuration ONLY.
Trane also provides a 50 VA trans-
former, time delay relay, a frost
detection sensor, and a selectable
outside air sensor on all DX unit
configurations. See Figure 18
for main coil header sizing.
Table 11: Single coil (4-pipe) data
Coil
Description
Coil
Type
Unit
Size
Fins per
inch FPI
Rows
Cooling
(Main)
Face
&
Bypass
DX-Main
E-heat
(preheat)
Aux. Coil
F3-F6
075-150 12
1 Not
Available
200 14
Figure 18: Main DX coil header sizing. (Only available with left
hand configuration)
Indicates air flow
Table 12: Single coil (4-pipe) data
Coil
Description
Coil
Type
Unit
Size
Fins per
inch FPI
Rows
Cooling
(Main)
Face
&
Bypass
DX-Main
Coil FO
075-150 12
2 Not
Available
200 14
DX-Main
HW
(preheat)
Aux. Coil
FA
075-150
12
2
Not
Available
200 14
Thermal Expansion Valve
All refrigeration coils (F0, FA, F3-F6) come with a thermal expansion
valve flow metering device. This thermal expansion valve (TXV) precise-
ly meters refrigerant flow through the coil and allows the unit to operate
at an entering air temperature from 40 F to 90 F.
Unlike cap-tube assemblies, the expansion valve device allows the exact
amount of refrigerant required to meet the coil load demands. This pre-
cise metering by the TXV increases the efficiency of the unit. See Figure
19 for expansion valve.
Figure 19: Expansion valve
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