Fryer Troubleshooting - Dean D50 Installation, Operation & Maintenance Manual

7. FRYER TROUBLESHOOTING

7.1 GENERAL:
These troubleshooting procedures help locate
the most encountered problems and will give
possible solutions/corrective action to be taken.
To use these flowcharts, start at the top of the
diagram. Follow each step in sequence. The
answer may be "yes" or "no". In either case,
follow the arrows directing you through the
sequence of steps.
CAUTION
This appliance may have more than one power
supply connection point. Disconnect all power
cords before servicing.
WARNING!
INSPECTION, TESTING, AND REPAIR
OF GAS OR ELECTRICAL EQUIPMENT
SHOULD BE
QUALIFIED PERSONNEL.
USE EXTREME
ELECTRICAL CIRCUIT TESTS.
CIRCUIT WILL BE EXPOSED.
7.2
PILOT BURNER MALFUNCTIONS
a. Pilot will not ignite; no evidence of gas at
pilot burner.
ü Check that gas valve is open and gas is
present at the gas valve.
ü Check pilot burner orifice for dirt or
lint.
ü Remove pilot burner gas supply line
and check for contamination; blow out
if necessary, then reinstall.
PERFORMED BY
CARE DURING
LIVE
b. Pilot burner ignites but will not remain lit
when gas valve manual knob is released.
ü Check that thermocouple lead is
properly screwed into pilotstat power
unit bushing on gas valve.
ü Remove end of thermocouple lead
from pilotstat power unit bushing and
clean with fine sandpaper or emery
cloth.
ü Pilot flame may be too high or too
low.
screw so that pilot flame extends about
19 mm (3/4") above the top of the
pilot burner.
ü Check all connections for cleanliness
and security.
ü Check high limit thermostat for
continuity.
c. Pilot flame of proper size, but is unstable.
Flame wavers and does not envelop the
thermocouple completely at all times.
ü Check for drafts which might be
caused by air conditioning equipment
:
or make-up air apparatus. Turn these
off and recheck the pilot.
7.3
MAIN BURNER MALFUNCTIONS:
a. Main burner will not come "ON"; no gas
present at main burner.
ü Check that the gas valve is open.
ü Check that the pilot is ignited and is
operating properly.
ü Check the high limit switch for
continuity.
25
Adjust pilot flame adjustment