Thermo King SB-210, Manual

Page: 130 / 159

Structural Maintenance
130
Defrost Damper
Check the damper during scheduled maintenance
inspections for shaft wear, end play, and the
ability to stop the air flow.
Position the damper so that air flow is stopped on
the top and bottom edges with the solenoid
plunger bottomed out.
To adjust the damper:
1. Remove the damper assembly from the
evaporator.
2. Disconnect the damper link from the eye bolt.
3. Check Distance A, the distance from the
shoulder on the solenoid to the center of the
hole in the eye bolt. Distance A should be 2.75
in. (69.85 mm) with the solenoid
de-energized.
4. If necessary, adjust Distance A to the proper
dimension by loosening the locknut on the end
of the solenoid plunger and turning the eye
bolt. Tighten the locknut when Distance A is
correct.
5. Connect the damper link to the eye bolt.
6. Energize the solenoid (apply 12 volts dc) and
check the damper blade to make sure that both
edges contact the damper housing. If
necessary, adjust this by loosening the
solenoid mounting bolts and moving the
solenoid. Tighten the solenoid mounting bolts
when both edges of the damper blade contact
the damper housing.
7. Adjust the damper blade stops so they contact
the edges of the damper blade. This keeps the
damper from sticking closed.
1. Stop 6. Eye Bolt
2. Mounting Bolts 7. Round Stop
3. Closed Position 8. Distance A 2.75 in. (69.85 mm)
4. Open Position 9. Solenoid
5. Damper Link
Figure 117: Defrost Damper Adjustment
AEA719
1 2
9
8
1
7
4
3
5
6