TM 9-4120-402-14
4-33. COIL FROST SWITCH (S2). - continued
CAUTION
Be careful not to kink capillary line temperature sensor.
(2) Carefully pull capillary line temperature sensor (2) from evaporator coil.
(3) Remove two sets of screws (3), nuts (4), lock washers (5), flat washers (6), and cil frost switch (1).
o
(4) Place the capillary line temperature sensor (2) in a temperature controlled bath, 470 to 520F (80 to 110C)
and set multimeter to measure continuity. Place multimeter leads on terminals 1 and 2 of the coil frost
switch (1). A closed circuit (continuity) should be indicated.
(5) Place the capillary line temperature sensor (2) in a temperature controlled bath, 240 to 29OF (-4to -20 )
C
and set multimeter to measure continuity. Place multimeter leads on terminals 1 and 2 of the coil frost
switch (1). An open circuit (no continuity) should be indicated.
(6) Replace coil frost switch (1) if it tests defective or is damaged.
c.
Replace.
(1) Tag and disconnect wire leads from coil frost switch (1).
CAUTION
Be careful not to kink capillary line temperature sensor.
(2) Carefully pull capillary line temperature sensor (2) from evaporator coil.
(3) Remove two sets of screws (3), nuts (4), lock washers (5), flat washers (6), and coil frost switch (1).
CAUTION
Be careful not to kink capillary line temperature sensor.
(4) Carefully shape' the new capillary line temperature sensor (2) to match the old capillary line temperature
sensor.
(5) Secure new coil frost switch (1) to casing with two sets of screws (3), flat washers (6), lock washers (5), and
nuts (4).
(6) Carefully insert capillary line temperature sensor (2) into evaporator coil.
(7) Connect wire leads to coil frost switch (1) using tags and wiring diagram figure 4-10. Remove tags.
NOTE
FOLLOW-ON MAINTENANCE:
Connect power at power source.
4-104