Pressure Switches S5 and S6

5-17. Solenoid Valves

(6) Remove electrical connector P4 from the

junction box and unsolder two unmarked wires

Removal.

from connector.

(1) Unsolder the electrical cable to the

b. Installation. Installation of the pressure

solenoid valve to be removed. The leads to the

switch shall be in the reverse order of removal.

s o l e n o i d valves are soldered to connector P4 which

Evacuate and recharge the refrigerant system (para

connects to the rear of the junction box.

5 - 8 d and para 5-8 e ) .

CAUTION

The solenoid valve must be dis-

5-15. Pressure Switches S5 and S6

assembled before disconnecting the

a. General. Pressure switches S5 and S6 are

tubing from the valves to avoid heat

c o n t a i n e d in an enclosure behind the rear panel and

distortion.

toward the top. The pressure switches and en-

(2) Remove two screws securing the lower

closure must be removed as an assembly, then the

portion of the valve to the upper assembly and

switches removed from the enclosure.

assembly.

Remove the

remove

the upper

b. Removal.

diaphragm from the lower assembly.

(1) Remove fifteen screws securing the top

(3) Discharge the refrigerant system (para 5-

p a n e l on the air conditioner and remove the panel.

8 b ).

(2) Discharge the refrigerant system (para 5-

( 4 ) Using heat, disconnect the tubing from the

8 b ).

lower portion of the valve.

(3) Remove the capillary tubing of each

(5) Remove two screws securing the lower

p r e s s u r e switch by removing the flare nut from the

portion of the valve to the mounting bracket and

refrigerant tubing.

remove the lower portion.

(4) Remove four screws from the outside of

b. Installation. Installation of the solenoid

the rear panel that holds the pressure switch en-

v a l v e s shall be in reverse order of removal. Be sure

closure assembly. Rem ove the assembly, being

that all soldered connections are tight and that all

careful not to damage the capillary tubing on each

wiring connections are tight and that the valve is

pressure switch.

reassembled correctly after connections are

(5) Remove two screws holding each pressure

soldered. Evacuate and re-charge the refrigerant

switch to the enclosure and remove the switches.

s y s t e m ( p a r a 5 - 8 d and para 5-8 e ) .

c. I n s t a l l a t i o n . I n s t a l l a t i o n o f t h e p r e s s u r e

5-18.

Expansion

Valves

s w i t c h e s shall be the reverse of removal. Care must

b e taken so as not to damage the capillary tubing of

Removal.

each switch and that each one is connected

(1) Discharge the refrigerant system (para 5-

properly. Evacuate and re-charge the refrigerant

8 b ).

s y s t e m ( p a r a 5 - 8 d and 5-8 e ) .

(2) Remove 15 screws, securing the top panel,

and remove panel from the air conditioner.

5-16. Service Valves

(3) Remove screws and clamps securing the

a. Removal.

sensing element for the expansion valve.

(1) Discharge the refrigerant system (para 5-

( 4 ) Remove 2 screws securing the valve to the

8b).

unit, and remove the top portion of the valve.

( 2 ) Remove fifteen screws and remove the top

(5) Melt solder and disconnect refrigerant

panel.

tubes.

(3) Remove service valve access panel.

b. Installation. Installation of the thermostatic

(4) Remove screw and clamp holding the

expansion valves shall be in reverse order of

charging valve.

removal. Be sure that all soldered connections are

(5) Using heat remove the tubing from the

tight. Evacuate and re-charge the refrigerant

charging valve to be removed.

s y s t e m ( p a r a 5 - 8 d a n d p a r a 5 - 8 e). C h e c k f o r t h e

(6) Remove the service valve from the air

proper superheat adjustment of the valve and

conditioner.

adjust if required (para 4-62).

NOTE

Valve cores may be replaced if defective.

5-19. Fluid Pressure Regulator

Removal

b. lnstallation. Installation of the service valves

(1) Discharge the refrigerant system (para 5-

shall be in reverse order of removal. Be sure that all

8 b).

soldered connections are tight. Evacuate and re-

(2) Remove fifteen screws securing the top

charge the refrigerant system (para 5-8 d a n d p a r a

panel on the air conditioner and remove the top

5-8 e).

panel.

5-8