VSX SERIES STEAMER - SERVICE PROCEDURES
Page 26 of 80
DIRECT STEAM MODELS
These models consist of a pressure regulator and
gauge that run off a buildings potable steam supply.
The maximum input pressure to the regulator should
be 15 psi. Incoming power (120VAC) for the
compartment controls is supplied from a junction
box in the base. See “COOKING COMPARTMENT
CONTROLS” under “COMPONENT FUNCTION
AND LOCATION” and “COOKING
COMPARTMENT” under “SERVICE
PROCEDURES”.
REGENERATED STEAM MODELS (STEAM COIL)
The steam coils are intended for use at a steam
supply pressure of 15 psi maximum. A pressure
regulating valve is available as optional equipment
for steamers where the steam supply pressure
exceeds 15 psi. The regulator used will be of the
adjustable type and should be set for a discharge
pressure of 15 psi. This pressure can be monitored
by the supplied pressure gauge. The regulator
should be set ONLY when steam is flowing (steam
solenoid valve is open). If steam is heavy with
condensate, install a ball float trap in the steam line
before the pressure regulating valve.
To remove a steam coil, disconnect union in steam
supply line to the coils and in the condensate
discharge line from the coils. Remove header that
supplies steam to coils by disconnecting union at
each coil. In same way, remove coil condensate
collection header. Remove four bolts clamping each
coil flange in place and pull coil forward. Use a new
flange gasket when replacing coil. The faces that
mate with gasket must be clean.
Turn steamer power switch ON, allowing steam
generation and, consequently, pressure to rise to
normal operating level and then turn power switch
OFF for a final purging of boiler and steam supply
lines. Steamer is now ready for use.
COOKING COMPARTMENT
WARNING:
CERTAIN PROCEDURES IN THIS
SECTION REQUIRE 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.
Controls
For access to compartment controls, remove the
right side compartment panel.
Check for failure of the control circuit in the
following order:
1. Ensure that voltage is reaching control circuit
through compartment pressure switch, when
the main power switch is turned ON.
2. On electric heat models with a transformer,
check step down transformer for proper
operation.
3. Check door switch for proper operation.
4. Check cooking timer function and contact
position. See “SCHEMATIC ALL MODELS -
COMPARTMENT CONTROLS” under
“ELECTRICAL OPERATION”.
5. Check that timer motor operates when
connected to power. If a problem is found in
timer, replace it, do not take timer apart.
6. Check wiring for damaged insulation. (no short
circuit)
7. Check that all connections and terminals are
securely fastened. (no open circuits)
8. Check that all connections are made according
to compartment control wiring diagram.
Steam Supply Solenoid
- Each cooking
compartment is supplied steam by its own individual
steam supply solenoid. These solenoid valves are a
standard type and can be disassembled for
cleaning.
1.
Newer Steamer Models
- The magnetic coil of
a solenoid valve is removed from the valve by
removing the snap catch at the top. Unions or
compression fittings are provided to allow easy
removal of the valve bodies. The solenoid
valves must be removed for disassembly as
outlined under “FILL AND COLD WATER
SOLENOID VALVES”.
2.
Older Steamer Models
- Remove the two
screws and remove the inlet part of the body,
the compression spring on the back of it and
the plastic part now exposed. Unscrew and
remove the plunger tube. Remove the plunger
(the valve blade is pinned to the lower end of
the plunger). The plastic seat at the exhaust
side of the valve blade may now be removed
from the body. This is a direct acting valve.
The blade must be clean and the blade mating
surfaces of the plastic seat members must be
flat and undamaged. The plunger and plunger
tube must be clean and the plunger must slide
freely in the tube. The compression spring
which fits in the hole in the top of the plunger
must be clean and move freely.
