Troubleshooting
8
312396D
Troubleshooting
Repair
Normally, only the ball support/seat (5) and piston pack-
ing (12) will ever need replacement. Repair Kit 255474
is available to replace these parts. See page 10.
1.
Lubricate the piston packing (12), piston (7), and
spring guide (15) with lithium base grease.
2.
Place the washer (13) over the pointed end of the
piston (7).
3.
Place the packing (12), with its lips facing down,
over the pointed end of the piston (7) and against
the washer (13).
4.
Insert the piston (7) into the bottom of the cylinder
(3) and gently work it into place.
5.
Reassemble the remaining parts in reverse order of
disassembly. Torque the valve seat (5) into the
housing to 175 to 200 in-lb (20 to 22 N•m). Over-
tightening could break off the hex portion of the
seat.
Install New Heater Cartridge(s),
RTD Sensor, or Switch
See F
1.
Remove cover (25).
2.
Remove and disconnect lead wires of failed compo-
nents.
3.
Gently slide new heater(s) or sensor into appropri-
ate hole.
4.
Feed new wires through conduit to connector (38)
and crimp after cutting to length and stripping.
5.
Use an ohmmeter to check:
a.
Heater pins 1 to 2, 262 ohms, + 26/-13 ohms.
b.
RTD sensor pin 3 to 4, 108 ohms, +/-1 ohm at
70°F (21°C).
c.
Continuity to regulator body from pin 8.
d.
No continuity from pins 1-7 to regulator body or
connector shell, or ground pin 8.
Some solutions require disassembling fluid regulator.
Always relieve system pressure and disconnect elec-
trical cable before performing these procedures.
Problem
Cause(s)
Solution(s)
Regulator does not heat material
Loose heater wires.
Check and reconnect wire connec-
tions.
Loose sensor wires.
Check and reconnect wire connec-
tions.
Heater cartridge failed.
Replace failed heater.
Sensor failed.
Replace failed sensor.
Temperature controller failed.
Refer to Therm-O-Flow
®
manual.
No power to heating circuitry.
Refer to Therm-O-Flow
®
manual.
