27
308219
Service –
Heater Sensor Probe
WARNING
To reduce the risk of serious injury, including burns
from hot fluid or hot metal; fluid injection; or electric
shock:
1.
Cool the fluid in the heater by
pumping unheated fluid through it for
two minutes before removing the
front heater panel (238).
2.
Follow the
Pressure Relief Proce-
dure
on page 6 before checking or
adjusting any part of the system or
any component and whenever you
are instructed to relieve pressure.
3.
Disconnect the main electrical power
to the heater before removing any
heater panels.
Replacing the Heater Sensor Probe
NOTE:
Use Repair Kit 220650.
1.
Relieve the pressure, and shut off the main power
to the heater.
2.
Perform the electrical resistance check on page
20.
3.
Disconnect the power cord. Remove the front
heater panel (238).
4.
Cut the probe wires close to the connector P2 in
the control box. Using a screwdriver, push the pins
in the connector down and out. Save the
connector.
5.
Unscrew the adapter (247c) and remove the probe
assembly (247) from the manifold (253). See Fig.
15.
6.
Push the probe (247d) through the adapter (247c).
Feed the probe wires through the seal (247b) and
packing nut (247a). Push the seal into the adapter
(247c) and then apply PTFE tape to its threads.
7.
Use needle nose pliers to push the probe into the
manifold (253) so it is between two heater element
coils, is touching the heater element cord, and
protrudes 1.44 in. (36 mm) from the manifold. A
gauge (286) can be used to verify this distance.
Finger-tighten the packing nut (247a). See Fig. 16.
8.
Tighten the adapter (247c) fully into the manifold.
9.
Tighten the packing nut (247a) to 20–30 ft-lb
(27–41 N
S
m).
10. Guide the probe wires through the opening in the
bottom of the control box.
11. Insert the new probe wires into the outer slots of
the connectors P2. See Fig. 19, page 29. Do not
connect a wire to the center.
12. Calibrate the probe.
Calibrating the Heater Sensor Probe
1.
Monitor the temperature of the fluid flowing at the
thermometers.
2.
If the temperature does not go low enough at the
MIN setting, turn the calibrate potentiometer as
instructed on page 32.
Fig. 15
01297
247c
247b
247a
247d
Torque to 20–30 ft-lb
(27–41 N
S
m)
253
247
Fig. 16
1.44”
(36 mm)
Use gauge
(286) to verify
distance
01695
Содержание FOAM-CAT 200 Series
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