TM 55-4920-227-15
panel (6) and secure with four screws (48).
(2) Tag and disconnect the leads from the
(2) Install the screw lock wires.
terminals on the time delay relay (13, fig.
(3) Remove the lock wires from the four screws
68. Blower Motor Overload Relay
a. Removal.
(12). Remove the screws and remove the
(1) Disconnect the input power source.
time delay relay (13) from the control panel
(2) Tag and disconnect the leads on the thermal
(6).
overload relay (10, fig. 22).
b. Cleaning and Inspection.
(3) Remove the lock wires from the two screws
(1) Clean the time relay with a cloth dampened
(8). Remove the two screws (8) that secure
with an approved cleaning solvent.
the relay bracket (9) to the control panel (6)
(2) Inspect the relay for cracks, damaged
and remove the assembled relay bracket.
terminals, corrosion, and for a sticking or
(4) Remove two screws from each of the
binding armature. Replace if defective.
thermal overload relays (10) and remove the
(3) Inspect the hardware for cracks, breaks, or
relays from the relay bracket (9).
damaged threads. Replace if defective.
(5) Remove the heaters (para. 11).
c. Installation.
b. Cleaning and Inspection.
(1) Position the time delay relay (13) on the
(1) Clean all parts with a cloth dampened with
control panel (6) and secure with four
an approved cleaning solvent.
screws (12). Install the screw lock wires.
(2) Inspect the thermal overload relays for a
(2) Connect the tagged leads to the terminals of
cracked or broken case, corrosion, damaged
the time delay relay (13).
terminals, and for a sticking or binding reset
(3) Connect the power input source.
button. Replace if defective.
(3) Inspect all other parts for cracks, breaks,
70. Control Circuit Transformer (Dual Voltage)
corrosion, or other damage. Replace any
a. Removal.
defective part.
(1) Disconnect the power input source.
c. Installation.
(2) Tag and disconnec t the leads from the
(1) Install the heaters (para. 11).
terminals on the transformer (16, fig. 22).
(2) Install the two thermal overload relays (10)
(3) Remove the lock wires from the four screws
on the relay bracket (9) and secure each
(15). Remove the screws and remove the
with two screws.
transformer (16) from the control panel (6).
(3) Position the assembled relay bracket (9) on
b. Cleaning and Inspection.
the control panel (6) and secure with two
(1) Clean the transformer with a cloth
screws (8). Install screw lock wires.
dampened with an approved cleaning
(4) Connect the tagged electrical leads to the
solvent.
terminals of the thermal overload relays
(2) Inspect the transformer for damaged
(10).
terminals and laminations, and for burned,
(5) Connect the input power source.
brittle, or frayed insulation.
Check the
transformer for continuity.
Replace if
defective.
69. Time Delay Relay
a. Removal.
(1) Disconnect the power input source.
AGO 6729A
50
