TM 9-4120-408-14
5-26. THERMOEXPANSION VALVE (TEV) MAINTENANCE. (Continued)
Figure 5-23. Thermoexpnasion Valve Test Setup.
(7) Adjusting Superheat: Simulating 6
:
(a) Suction line temperature = 32(temperature sensing bulb (1) is in ice).
26= 25 psi (172 kPa) (R-12)
NOTE
Turn clockwise to increase superheat.
Turn counter-clockwise to decrease superheat.
(c) Adjust valve stem of TEV to get 25 psi (172 kPa) on compound gage. Replace TEV if 25 psi (172 kPa) can
not be reached.
c. Install .
(2) Align two flare nuts (6) and secure TEV (7).
(3) Position TEV sensing bulb (5) on side of suction line tube assembly (1) and secure with clamp (4), two screws
(3), and nut (2). Coil and secure capillary tube of TEV sensing bulb (5) with new tiedown straps.
5-63