29
PRESSURE RELIEF VALVEPERIODIC TESTING
Most insurance agencies require periodic testing of
pressure relief valves used on pressure vessels. This
procedure will allow you to safely and quickly test your
kettle's pressure relief valve. We recommend this test
be performed twice a year.
NOTE: The following instruction is intended for use by
qualified service personnel.
WARNING: Kettle surface will be hot and steam will
be released during testing. Take necessary precautions
including the use of gloves and eye protection to
prevent personal injury.
1. With the kettle empty, turn
unit ON and set
temperature
control to 10
. Allow the kettle
to heat until the unit cycles
off.
2. Switch unit OFF and
disconnect main power at
fused disconnect switch.
3. Remove Access Panel at
back of main kettle console.
4. Pull Pressure Relief Valve
Ring open for a maximum of
one second. Repeat test
three to four times. Each time
the mechanism should move
freely and be accompanied
by a rapid escape of steam.
NOTES:
If valve appears to be sticking replace pressure relief
valve.
If foreign material is discharged then drain kettle and
replace pressure relief valve.
See KETTLE JACKET FILLING AND DRAINING
PROCEDURES on page #30 for full instructions on the
correct method for draining and refilling kettle jacket.
WARNING: Improper refilling of kettle jacket will result
in irreversible damage to unit.
5. Replace Access Panel.
6. Reconnect main power at fused disconnect switch..
CALIBRATING PROCEDURE
1. Insure the unit has a vacuum before you begin
calibrating procedures. If unit requires venting refer
to KETTLE VENTING INSTRUCTIONS on
page #27.
2. Turn kettle ON and set
temperature control to 10
.
3. Allow the unit to cycle twice.
4. Check temperature of the
inner kettle surface with a
digital surface thermometer.
5. Temperature should be
between 260°F and 265°F.
6. Using a screw driver adjust
temperature by turning the
potentiometer on the Solid State Temperature
Control Box. Turn very little. Turn clockwise to
INCREASES and counter-clockwise to DECREASE
temperature.
7. Allow the unit to cycle twice.
8. Check temperature of the inner kettle surface with
a digital surface thermometer.
9. Repeat steps 4. through 8. until unit is calibrated.
DANGER: PRESSURE RELIEF
VALVE WILL EXHAUST HIGH
TEMPERATURE STEAM.CONTACT
WITH SKIN COULD RESULT IN
SERIOUS BURNS. KEEP FACE,
HANDS AND BODY CLEAR OF DISCHARGE.
DANGER: WORKING ON MACHINES
WITH POWER COULD RESULT IN
SEVERE ELECTRICAL SHOCK.
Pressure
Relief Valve
Access
Panel
Valve
Ring
Solid State Temperature
Control Box
Adjustment
Pot
2
3
56
7
8
9
1
4
10
OFF
2
3
56
7
8
9
1
4
10
OFF