TM 9-4120-402-14
5-26. LOW PRESSURE SWITCH (S3). - continued.
a.
Test.
(1)
Carefully pull pressure switch bracket (1) far enough out of unit to gain access to terminals.
(2)
Remove clip-n cover from low pressure switch (2).
(3)
Use a continuity tester or multimeter to check for continuity between terminals 1 and 2 on switch. If
there is continuity, the switch is properly closed. If no continuity is found, switch must be replaced.
b.
Replace.
(1)
Tag and disconnect wire leads from low pressure switch (2).
(2)
Remove two sets of screws (3) and lock washers (4).
(3)
(4)
Debraze capillary tube (5) from suction service valve line. (See paragraph 5-13.)
(5)
Remove low pressure switch (2) from unit.
(6)
Carefully run low pressure switch capillary tube (5) through unit to suction service valve line.
(7)
Braze capillary tube (5) to fitting on suction service valve line. (See paragraph 5-13.)
(8)
Position low pressure switch (2) onto pressure switch bracket (1) and secure with two sets of screws (3)
and lock washers (4).
(9)
Using tags and wiring diagram (figure 4-10) connect wire leads to low pressure switch (2) terminal.
Remove tags.
(10) Carefully coil excess capillary tubing in unit and tape in place to eliminate vibration.
(11) Carefully push pressure switch bracket (1) back into unit.
NOTE
FOLLOW-ON MAINTENANCE:
5-67