VSX SERIES STEAMER - SERVICE PROCEDURES
Page 23 of 80
Spark Ignition Control Test
1. If the ignition control module does not appear
to be sparking to ignite gas, perform the
following checks.
A. Check to ensure that all electrical terminal
connections on the ignition control module
and the ignitor are clean and tight.
B. Verify that the ignition control module and
the ignitor have good ground wire
connections. The ignitor mounting bracket
should have good metal to metal contact
to its mounting surface.
C. Turn the main power switch ON. Turn the
ignition control modules re-set switch OFF
then ON.
D. Check for 24VAC output on the ignition
control module transformer.
1) If 24VAC is present then replace
ignition control module and re-test.
2) If 24VAC is not present then ensure
that transformer is receiving 120VAC
input. If ignition control module
transformer is receiving proper
voltage, then replace ignition control
module transformer and re-test.
2. If the ignition control module and transformer
are functioning properly, then check the
following ignitor conditions.
A. The gap between the spark probe and the
ground clip should be approximately 1/8
inch. If the gap appears to be excessive or
poor sparking is occurring, remove the
electronic ignition pilot and adjust gap.
B. Inspect the ceramic flame rod insulator for
cracks or evidence of exposure to extreme
heat, which can permit leakage to ground.
If either of these conditions exist, then
replace the pilot ignitor assembly.
C. Check the ignition cable for tightness or
damaged insulation.
3. Check unit for proper operation.
Gas Combination Control Valve Replacement
WARNING:
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.
WARNING:
SHUT OFF THE GAS SUPPLY
BEFORE SERVICING THE UNIT.
WARNING:
ALL GAS JOINTS DISTURBED
DURING SERVICING MUST BE CHECKED FOR
LEAKS. CHECK WITH A SOAP AND WATER
SOLUTION (BUBBLES). DO NOT USE AN OPEN
FLAME.
A. CHECK ALL JOINTS PRIOR TO THE
GAS VALVE (SOLENOID) BEFORE
LIGHTING UNIT.
B. CHECK ALL JOINTS BEYOND GAS
VALVE (SOLENOID) AFTER UNIT IS LIT.
NOTE:
Gas combination control valves are not
serviceable and should not be disassembled. Once
the problem has been isolated to this control,
replace it. Do not attempt to repair the assembly.
Remove the two screws on the control box cover.
Disconnect electrical supply wires and conduit
running to the combination control valve.
Disconnect the thermocouple lead and pilot gas
supply tube from control and pipe connections on
each side of the control. Reverse procedure to
install and check unit for proper operation.
Manifold Pressure Adjustment
WARNING:
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.
WARNING:
SHUT OFF THE GAS SUPPLY
BEFORE SERVICING THE UNIT.
1. Open the front cabinet doors and turn the Gas
Combination Control Valve OFF.
2. To measure the manifold pressure, remove the
1/8 inch NPT plug (pressure tap) on the outlet
side of the valve and attach a manometer.
3. Turn the gas combination control valve and the
main power switch to ON.
4. Observe the manometer pressure reading and
compare to the pressure chart near the end of
this procedure.
