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VL BOILER BASE SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS
FILL AND COLD WATER SOLENOID
VALVES
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.
Check to ensure the solenoid valve is receiving power.
If the solenoid valve is receiving power but the valve
is not opening, the coil may be malfunctioning.
Replace the solenoid valve and check for proper
operation. If the solenoid valve is receiving power and
the valve appears to be opening but little or no water
is flowing through it, then the valve ports may be
clogged with debris or a valve component may be
malfunctioning. To check solenoid valve further, follow
the procedure outlined below.
Disassembly
NOTE: It is recommended that the valve be removed
for cleaning as outlined in this procedure. This will
prevent damage to the lines and fittings when the stem
is removed from the body.
1.
Remove the coil assembly from the valve stem
by lifting up on the retaining cap at the top of the
solenoid valve and sliding the metal cover plate
off.
2.
Clamp the body of the valve in a vise.
3.
Mark a scribe line on the stem nut to the valve
body for proper retightening.
4.
Remove the stem locking nut to remove the stem
from the valve body.
5.
All parts are now accessible for inspection and
cleaning.
F24650 Rev. A (1017)
NOTE: If internal solenoid parts appear to be
damaged or worn, then replace the solenoid valve. Do
not reuse damaged or worn parts. No internal solenoid
parts are available as a service replacement.
A.
Check rubber seal on bottom of plunger.
B.
Check plunger spring.
C.
Check O-ring in valve body.
D.
Check ports in valve body.
6.
Reverse procedure to install.
COMPARTMENT PRESSURE
Remove the left side panel from the boiler base to
access the compartment pressure regulating valve. If
the steamer is equipped with the compartment
pressure regulating valve and the steamer is
operating, set the pressure regulating valve to read 6
psi on the compartment gauge. Turn the hex head
screw at the top clockwise to increase the pressure
and counterclockwise to decrease. If the steamer is
not equipped with the compartment pressure
regulating valve, then the compartment will cycle at
the same pressures of the boiler. A mechanical
pressure relief valve serves as a safety backup control
and is preset for a maximum of 8 psi.
Page 28 of 93
Fig. 12
ADJUSTMENT
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.
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