Graco Therm-O-Flow 55-H, Instructions-Parts List Manual

Page: 36 / 76

36 310–534
Service
Replacing Heat Sensors
For more information about the follower plate, refer to
Figs. 33 and 34 on pages 56 and 58.
To replace a sensor:
WARNING
The material and equipment will be
hot! To reduce risk of injury, wear eye
protection, gloves and protective clothing
when installing, operating, or servicing
this dispensing system.
1. If the material drum has already been removed
from the supply unit, go to step 2. If you need to
remove the material drum, perform steps 1
through 4 of the procedure in Changing Empty
Drums on page 23.
2. Make sure the ram hand valve is in the OFF posi-
tion.
WARNING
ELECTROCUTION HAZARD
To reduce risk of injury or damage to
equipment, make sure the main discon-
nect is OFF before continuing with this
procedure.
3. Turn the system CONTROL ON switch to OFF.
4. Turn OFF the main electrical disconnect.
5. Loosen the conduit locknut (120).
6. Remove the sensor (90) from the follower plate.
7. Loosen the cord grip (100), located under the junc-
tion box.
8. Remove the junction box’s cover.
9. Disconnect the 2 sensor wires from the junction
box. See Fig. 20.
Fig. 20
1321
1331
10. Connect the 2 wires from the new sensor to the
terminals in the junction box.
11. Replace the junction box cover.
12. Coat the sensor with non-silicone heat-sink
compound.
13. Slide the cord grip o-ring back into the cord grip
and then tighten the cord grip underneath the
junction box.
14. Slide the new sensor into the sensor opening in
the follower plate.
15. Tighten the conduit locknut (120).