TM 9-4120-388-14
5-23. EXPANSION VALVE - Continued.
(13) When the proper setting is obtained:
(a) Turn unit OFF.
(b) Replace hexagonal seal cap.
(c) Remove thermometer.
(d) Cover the bulb and suction line with insulation tubing.
(e) Secure insulation tubing with tape (item 14, Appendix E.)
(f) Close service valves on unit.
(g) Remove gages or service manifold from service valves.
(h) Install hose connection protective caps.
(i) Secure service valve cover with four screws and flat washers.
Removal.
c.
(2) Unwrap insulation from suction line so that sensing bulb is exposed. Loosen screws and nuts in clamps.
pull bulb out of damps.
(3) Disconnect flare nut on external equalizer from expansion valve.
(4) Remove the two screws, flat washers, Iockwashers, and spacers that attach the valve body to its mounting
bracket.
(5) Remove remaining valve components except for body flange. (See Figure 5-22.)
NOTE
If valve body flange is not damaged, do not remove (debraze) it from the system.
(6) If valve body flange is to be removed, purge the system with nitrogen and braze all three tubes. (See para
d. Installation.
(1) If valve body flange was removed, purge the system with nitrogen while brazing the three tubing joints. (See
(3) Place capscrews, Iockwashers, flat washers, and spacers through bracket and valve body flange.
(4) Be sure that valve components are properly assembled and aligned and secure power assembly to body
flange.
(5) Connect flare nut on external equalizer line to expansion valve.
(6) Insert the sensing bulb into its mounting Ioop clamps in its original position and tighten the screws and nuts.
Be sure the sensing bulb is making good metal-to-metal contact with the suction line.
(7) Replace the insulation tubing that was removed from the sensing bulb and expansion valve connections.
(9) Leak test all newly connected joints and those in the repair area. (See para 5-10.)
(11) Evacuate and charge the refrigerant system. (See para 5-11 and 5-12.)