User's Manual

Repair
313540G 39
Overtemperature Switch
1. Turn main power OFF . Disconnect power
supply.
2. Relieve pressure, page 27.
3. Wait for heaters to cool.
4. Remove heater shroud.
5. Disconnect one leadwire from overtemperature
switch (408), F
IG. 10. Test across switch with ohm-
meter. Resistance must be approximately 0 ohms.
6. If switch fails test, remove wires and screws. Dis-
card failed switch. Apply thermal compound
110009, install new switch in same location on
housing (401), and secure with screws (411).
Reconnect wires.
NOTE: If wires need replacement, disconnect from
temperature control board. See T
ABLE 6, page 35 and
F
IG. 9, page 35.
Heated Hose
NOTE: Refer to the heated hose manual 309572 for
hose replacement parts.
Check Hose Connectors
1. Turn main power OFF . Disconnect power
supply.
2. Relieve pressure, page 27.
NOTE: Whip hose must be connected.
3. Disconnect hose connector (D) at Reactor, F
IG. 11.
4. Using an ohmmeter, check between the two termi-
nals of the connector (D). There should be continu-
ity.
5. If hose fails test, retest at each length of hose,
including whip hose, until failure is isolated.
Check FTS Cables
1. Turn main power OFF . Disconnect power
supply.
2. Relieve pressure, page 27.
3. Disconnect FTS cable (F) at Reactor, F
IG. 11.
4. Test with ohmmeter between pins of cable connec-
tor.
5. If cable fails test, retest at FTS, page 39.
FIG. 11. Heated Hose
Pins Result
1 to 2 approximately 35 ohms per 50 ft (15.2 m) of
hose, plus approximately 10 ohms for FTS
1 to 3 infinity
ti9878a
F
D