Graco Reactor H-VR Repair And Parts Manual page 39

Thermocouple
1. Turn main power OFF
supply.
2. Relieve pressure, page 28.
3. Wait for heaters to cool.
4. Remove heater shroud.
5. Disconnect thermocouple wires from B on tempera-
ture control module. See T
9, page 36.
6. Feed thermocouple wires out of cabinet. Note path
as wires must be replaced in the same way.
7. See F . 10. Loosen ferrule nut (N). Remove ther-
IG
mocouple (410) from heater housing (401), then
remove thermocouple housing (H). Do not remove
the thermocouple adapter (405) unless necessary. If
adapter must be removed, ensure that mixer (409)
is out of the way when replacing the adapter.
S
T
409
F . 10. Thermocouple
IG
313540L
. Disconnect power
6, page 36 and F
ABLE
410
N
H
405
1
8. Replace thermocouple, F
a. Remove protective tape from thermocouple tip
(T).
b. Apply PTFE tape and thread sealant to male
threads and tighten thermocouple housing (H)
into adapter (405).
c. Push in thermocouple (410) so tip (T) contacts
heater element (407).
d. Holding thermocouple (T) against heater ele-
ment, tighten ferrule nut (N) 1/4 turn past tight.
9. Route wires (S) into cabinet and thread into bundle
as before. Reconnect wires to board.
.
IG
10. Replace heater shroud.
11. Turn on heaters A and B simultaneously to test.
Temperatures should rise at same rate. If one
heater is low, loosen ferrule nut (N) and tighten ther-
mocouple housing (H) to ensure thermocouple tip
(T) contacts element (407).
1
Apply PTFE tape and thread sealant.
2
Apply 110009 thermal heatsink compound.
401 407
. 10.
IG
408
2
Repair
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