TM9-4120-401-14
4-36.
COIL FROST SWITCH (S2). - continued
Be careful not to kink capillary line temperature sensor.
(2) Carefully pull capillary line temperature sensor (2) from evaporator coil.
Remove two sets of screws (3), nuts (4), lock washers (5), and coil frost switch (1).
(3)
(4) Place the capillary line temperature sensor (2) in a temperature controlled bath, 47 to 52F (8 to
11 C) and set multimeter to measure continuity. Place rnultimeter leads on terminals 1 and 2 of the coil
frost switch (1). A closed circuit (continuity) should be indicated.
(5) Plaoe the capillary line temperature sensor (2) in a temperature controlled bath, 24 to 29F (-4 to
-2C) 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).
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), and ooil frost switch (1).
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 coil frost switch (1) to casing with two sets of screws (3), lock washers (4), and nuts (5).
(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 4-6). Remove tags.
NOTE
FOLLOW-ON MAINTENANCE:
Install top panel (para 4-11).
Connect power at power source.
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