TM 9-4120-407-14
3-27. COIL FROST SWITCH TESTING AND REPLACEMENT. (Cont)
Be careful not to kink capillary line temperature sensor as this can
damage the coil frost switch.
(2) Carefully pull capillary line temperature sensor (2) from evaporator coil (3).
(3) Remove two screws (4), lock washers (5), and coil frost switch (1). Discard lock washers.
(4) Place the capillary line temperature sensor in a temperature controlled bath, 47 to 52 F
(8" to 11 C) and set multimeter to measure continuity. Place multimeter leads on terminals 1 and 2
of the coil frost switch. A closed circuit (continuity) should be indicated.
(5) Replace coil frost switch (1) if continuity check fails.
b. Removal.
(1) Tag and disconnect wire leads from coil frost switch (1).
Be careful not to kink capillary line temperature sensor as this can
damage the coil frost.
(2) Carefully pull capillary line temperature sensor (2) from evaporator coil (3).
(3) Remove screws (4), lock washers (5), and coil frost switch (1).
Installation.
c.
Be careful not to kink capillary line temperature sensor as this can
damage the coil frost switch.
(1) Carefully shape the capillary line temperature sensor (2) as necessary.
(2) Install coil frost switch (1), two screws (4), and new lock washers (5).
(3) Carefully insert capillary line temperature sensor (2) into evaporator coil (3).
(4) Connect wire leads to coil frost switch (1) using tags and wiring diagram Figure 3-5. Remove tags.
NOTE
FOLLOW-ON MAINTENANCE:
Install top panel. See para 3-14.
3-106
