1-9
1.7.4 Replacing the Frypot (cont.)
9.
Recover the drain valve, high-limit thermostat, operating thermostat, and burner manifold
assembly from the failed frypot.
10.
Clean the threads on the recovered parts, apply Loctite PST 567 or equivalent thread sealer, and
install them on the replacement frypot.
11.
Reverse Steps 1-9 to install the replacement frypot in the cabinet.
For SUFF/UFF Filtration-equipped systems, consult the Decathlon Series Gas Fryers
Service & Parts Manual (819-5922), Section 1.7.8, for detailed frypot-removal
instructions.
1.8 Troubleshooting and Problem Isolation
This section is intended to provide technicians with a general knowledge of the broad problem
categories associated with this equipment, and the probable causes of each. With this knowledge, the
technician should be able to isolate and correct any problem encountered.
Problems you are likely to encounter can be grouped into these broad categories:
1.
Pilot failures
2.
Improper burner functioning
3.
Improper temperature control
4.
Filtration Problems
5.
Leaking
The probable causes and corrective actions for each category are discussed in the following sections.
1.8.1 Pilot Failures
When troubleshooting millivolt systems, always check these areas before performing diagnostic
checks on either the Robertshaw or Honeywell systems:
A.
Inspect all wires and component leads for damage (heat, oil, moisture, etc.). On capillary
tube-type thermostats, check for resistance on the thermostat lead wires. Wire nuts and other
connectors cannot be present in a millivolt circuit as they can cause resistance. If resistance
is found, solder the connectors to the wires or replace the wires.
B.
Clean and verify that all wire connections and gas valve terminal connections are tight.
C.
Check the length of the pilot flame (it should be about 1½-inches (38mm) long) and verify
that it contacts the top one third of the thermopile. Clean the pilot orifice and adjust the pilot
strength if needed.
D.
Measure thermopile output with no load (i.e., with the thermopile disconnected from the gas
valve). Measurement must be made with a multimeter having a 0-1000 DC millivolt (MV)
range. Light the pilot and have someone hold the gas cock knob in the depressed position. If
the thermopile is a single lead (coaxial) type, measure from the lead’s end contact to its
screw-in threads. If the thermopile has two leads, measure across the end terminals. The
reading should be within the range of 500-800 millivolts. If not, replace the thermopile.
Performing diagnostic checks on Robertshaw and Honeywell valves are described on the next page.
