Trane HUV Installation Operation & Maintenance page 14

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.
Indicates air flow
Table 11: Single coil (4-pipe) data
Coil Coil Unit
Description Type Size
DX-Main 075-150
E-heat F3-F6
(preheat)
200
Aux. Coil
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.
1 4
Direct Expansion Main Coils
Figure 18: Main DX coil header sizing. (Only available with left
Fins per Rows Face
inch FPI Cooling &
(Main) Bypass
12
1 Not
Available
14
hand configuration)
Table 12: Single coil (4-pipe) data
Coil Coil Unit
Description Type Size
DX-Main 075-150
Coil FO
DX-Main
HW 075-150
(preheat) FA
Aux. Coil
Fins per Rows
inch FPI Cooling
(Main)
12
2
200 14
12
2
200 14
Figure 19: Expansion valve
UV-PRC001-EN
Face
&
Bypass
Not
Available
Not
Available