Repair
Thermocouple
Read Warnings on page 4. Wait for heater to cool before repairing.
1. Turn main power OFF | . Disconnect power |
supply.
2.Relieve pressure, page 13.
3.Wait for heaters to cool.
4.Remove heater shroud.
5.Disconnect thermocouple wires from B on tempera- ture control module. See Table 2, page 26 and FIG. 6, page 26.
6.Feed thermocouple wires out of cabinet. Note path as wires must be replaced in the same way.
7.See FIG. 8. Loosen ferrule nut (N). Remove thermo- couple (361) from heater housing (351), then remove thermocouple housing (H). Do not remove the thermocouple adapter (356) unless necessary. If adapter must be removed, ensure that mixer (360) is out of the way when replacing the adapter.
S361
N
H
1 | 356 |
|
T 
360
FIG. 8. Thermocouple
8.Replace thermocouple, FIG. 8.
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 (356).
c.Push in thermocouple (361) so tip (T) contacts heater element (358).
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.
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 (358).
1 | Apply PTFE tape and thread sealant. | ||
2 | Apply 110009 thermal heatsink compound. | ||
301 | 358 | 2 | 359 |
ti7924a
30 | 3A1570A |
