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VL BOILER BASE SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS
A.
Heavy scale buildup inside copper steam
coil.
B.
Building steam supply pressure low.
C.
Cooking compartment steam solenoid valve
malfunction.
INLET WATER STRAINER
CERTAIN PROCEDURES IN THIS
SECTION REQUIRES ELECTRICAL
TEST OR MEASUREMENTS WHILE
POWER IS APPLIED TO THE
MACHINE. EXERCISE EXTREME
CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY
ACCESSIBLE, DISCONNECT
POWER, ATTACH TEST
EQUIPMENT AND REAPPLY
POWER TO TEST.
The in-line Y strainer should be located upstream of
the fill valve solenoid. Shut off the water supply.
Unscrew the cap from the body on the leg of the Y that
should be pointing downwards toward the floor.
Remove the screen and any foreign particles trapped
in the opening. Rinse the screen thoroughly to remove
accumulated debris and replace the screen in the
valve body. If screen cannot be thoroughly cleaned,
replace it with a new one. Reinstall the cap and ensure
that the Y strainer is positioned with the cap pointing
downward to catch debris.
The pressure regulating valve strainer will become
clogged if dirty steam lines are connected to direct
steam models. Remove the hex nut on the bottom of
the pressure regulating valve to clean the strainer and
valve seat.
F24650 Rev. A (1017)
PILOT AND THERMOCOUPLE
ASSEMBLY (GAS MODELS)
SHUT OFF THE GAS BEFORE SERVICING THE
UNIT.
The pilot thermocouple when heated, supplies a DC
millivolt signal to an internal solenoid valve on the gas
combination control valve. This solenoid valve is
designed to shut off the gas flow to the pilot and main
burners in case of a malfunction in the system. When
energized by the thermocouple voltage, the valve is
held in the open position to permit gas flow. The pilot
burner flame is controlled by an adjustable needle
valve located under a small cap screw on the
combination control valve.
When experiencing pilot outages, visually check pilot
flame for the proper contact on thermocouple and the
flame color. Also, check to see that excessive air
drafts are not interfering with proper heating of the
thermocouple by the pilot flame.
The pilot flame should be a steady blue flame that
envelopes the thermocouple tip. The flame should be
about one inch long with half its length extending
beyond the outer edges of the pilot shield. If the pilot
flame does not appear to be this length and color, then
adjust as necessary. See the diagram below for an
example of unsatisfactory pilot flames. Turn clockwise
to decrease pilot flame and counterclockwise to
increase.
Page 32 of 93
CERTAIN PROCEDURES IN THIS
SECTION REQUIRES ELECTRICAL
TEST OR MEASUREMENTS WHILE
POWER IS APPLIED TO THE
MACHINE. EXERCISE EXTREME
CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY
ACCESSIBLE, DISCONNECT
POWER, ATTACH TEST
EQUIPMENT AND REAPPLY
POWER TO TEST.
DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE
MAIN CIRCUIT BOX. PLACE A TAG
ON THE CIRCUIT BOX INDICATING
THE CIRCUIT IS BEING SERVICED.
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