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VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
F25154 (February 2004) Page 18 of 48
1) Verify wire color connections are
correct at probe numbers 50, 51 & 52,
and at the water level control board.
2) Turn power switch off.
3) Remove probe assembly, clean lime
scale build-up from the probes and
compare probe lengths to drawing.
4) Disconnect 3/8” flexible line (air
equalization tube) from probe housing
assembly and from boiler tee. Check
flex line for obstructions and remove
as necessary.
5) Disconnect 3/8” flexible line (pressure
switch tube) from boiler tee. Remove
boiler tee and check for obstructions
in the tee and in the mounting hole.
Remove obstructions as necessary.
NOTE: When replacing, boiler tee must be
mounted vertical to prevent a blockage due
to condensate build-up.
4. Test LLCO circuit on water level control board.
A. Turn power switch on and allow boiler to
fill. Do not press the reset switch to start
heating.
B. Turn water supply off and open the ball
valve on probe housing assembly. This will
allow boiler water to drain.
C. When water level is no longer visible in
sight glass and is below LLCO probe;
LLCO LED should turn off, LLCO relay
should de-energize and return LLCO relay
contacts to there shelf state.
D. Repeat at least twice to verify correct
LLCO operation.
Auxiliary Low level Cut-Off Control
5. Turn power switch off.
6. Disconnect lead wire from Aux LLCO probe.
A. Set VOM to read resistance (ohms) and
connect meter leads to Aux LLCO probe
and boiler. If there is any measurable
resistance, remove and clean the Aux
LLCO probe.
B. Replace the probe and check resistance
again. If resistance is still present, install a
replacement probe.
C. Verify resistance measurement with new
probe installed.
7. Turn power switch on and allow boiler to begin
filling. Do not press the reset switch to start
heating.
8. With water below the lowest visible level in sight
glass (below Aux LLCO probe) and boiler in
initial fill state:
A. Verify Aux LLCO LED is not lit on the Aux
water level control board.