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VL SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
NOTE: If adjustments in gas or pilot pressure
settings are made, always replace the adjustment
cover screw to assure proper gas control operation.
If the adjustment does not result in a pilot flame of
proper size, then gas might not be flowing properly
to the pilot. Check for a plugged pilot orifice, a
kinked or plugged pilot gas supply tube and for low
gas supply pressure. The pilot operates unregulated
at gas supply pressures while the pressure regulator
in the combination control valve regulates pressure
to the main burners only. Visually check the
thermocouple tip (hot end) and tube lead for kinks or
pinches that might be causing a short between the
tube and the wire inside. Also, check the threaded
connector tip for corrosion, tarnish or dirt which can
cause a poor connection. If the thermocouple shows
either of these signs, it should be replaced with a
new one.
NOTE: The connection of the tubing from the
thermocouple tip to the control valve is an electrical
connection and must be clean. Do not use any
sealing compound on the threads or over tighten the
threaded connection. Finger tighten the nut plus 1/4
turn with a wrench. Over tightening the nut could
crush the insulator, shorting the thermocouple.
If the pilot flame is correct and there are no drafts,
then the problem is in the thermocouple output
voltage or the gas solenoid valve in the combination
control.
Check the thermocouple output voltage as follows:
1.
Turn the power switch OFF and disconnect the
thermocouple from the gas combination control
valve.
2.
Check the thermocouple DC millivolt output
with a VOM. If a meter is not available, replace
the thermocouple with a new one and check
operation again.
A.
Install a thermocouple adaptor into the
connection on the gas combination control
valve. Screw the thermocouple in to the
adaptor then connect the meter leads to it.
See "TOOLS" under "GENERAL" for
information on thermocouple adaptor. If a
thermocouple adaptor is not available then
turn the power switch OFF, disconnect the
thermocouple from the gas combination
control valve and proceed to step 2D.
B.
Turn the power switch ON and light the
pilot. Allow the pilot to heat the
thermocouple for one to two minutes and
take a closed circuit reading. Compare the
readings with the chart below.
1)
2)
3)
C.
Turn the power switch OFF and
disconnect the thermocouple adaptor from
the gas combination control valve and
thermocouple.
Page 30 of 88
If the reading is less than the
minimum or thermocouple is not
operating as described, replace the
thermocouple as outlined under
"PILOT AND THERMOCOUPLE
ASSEMBLY (GAS MODELS)" in
"REMOVAL AND REPLACEMENT
OF PARTS" then check for proper
operation.
If the reading is within the range listed
in the chart below then thermocouple
is operating properly. Reconnect the
thermocouple to the gas combination
control valve.
If after replacing thermocouple, the
pilot or main burners are still not
functioning properly, then a problem
in the gas combination control valve
exists as well. Replace the
combination control valve as outlined
under "GAS COMBINATION
CONTROL VALVE" in "REMOVAL
AND REPLACEMENT OF PARTS"
then check for proper operation.
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