Graco 26R310, Repair And Parts Manual

Page: 37 / 82

Repair
3A8501A 37
Replace RTD
1. Follow Shutdown on page 20.
2. Follow the Pressure Relief Procedure on page 19.
3. Wait for the heaters to cool.
4. Remove the lower covers (57, 58).
5. Cut the cable ties from around the woven wrap with
the RTD cable (212).
6. Disconnect RTD cable (212) from TCM (453).
7. Loosen ferrule nut (N). Remove RTD (212) from RTD
housing (H), then remove RTD housing (H). Do not
remove the adapter (206) unless necessary. If the
adapter must be removed, make sure the mixer
(210) does not interfere replacing the adapter.
8. Remove the RTD cable (212) from the woven wrap.
9. Replace RTD (212):
a. Apply PTFE tape and thread sealant to the male
pipe threads and tighten RTD housing (H) into
the adapter (206).
b. Push in RTD (212) so the tip contacts the heater
element (208).
c. Holding RTD (212) against the heater element,
tighten the ferrule nut (N) 3/4 of a turn past
finger-tight.
10. Route the wires as before through the woven wrap
and reconnect the RTD cable (212) to the TCM.
11. Replace lower covers (57, 58).
12. Follow the startup instructions in the operation
manual. Turn on A-side and B-side heat
simultaneously to test. Temperatures should rise at
the same rate. If one is low, loosen ferrule nut (N)
and lightly tighten RTD housing (H) to make sure
the RTD tip contacts element (212) when ferrule nut
(N) is re-tightened.
ti41093a
58
57
24
+ 1
6
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