Graco Therm-O-Flow 200 Instructions Manual page 46

Service
Replacing Heat Sensors
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, follow the procedure for Drum
Changing on page 36.
2. Make sure the ram plate is down and the ram hand
valve is in the OFF position. See page 45.
To reduce the risk of injury or damage to equipment,
make sure the main disconnect is off before continuing
with this procedure.
3. Turn OFF the main electrical disconnect switch.
4. Remove the front and right side pump cover.
5. Remove the sensor from the ram plate.
6. Disconnect the two sensor wires from the J1 or J2 of
PCB201. See Fig F
IG
PCB
PCB
246 201
J1 J2 J3 J4 J1 J2 J3 J4
F . 23
IG
7. Attach the leads from the new sensor to the leads of
the old sensor and pull the new sensor leads into
the main control panel.
8. Install the new sensor into the follower/tire plate
after coating with non-silicone heat sink compound.
Tighten compression nut.
9. Connect the two wires from the new sensor to the
J1 or J2 of PCB201.
10. Replace the pump covers.
46
. 23.
PCB
226
311208P