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VHX SERIES STEAMER - ELECTRICAL OPERATION
F24700 (October 2001)Page 45 of 68
LED
STATUS
DESCRIPTION ELECTRICAL COMPONENTS CONDITION
ON OFF
N1 X same as “state A”
N2 X same as "state B"
N3 X same as “state A”
N4 X same as "state B
N5 X
Reset switch is/was momentarily
energized
K3 energized - K3(1) CLOSE (locking circuit)
N6 X
Aux Water level is satisfied.
(Amber WATER light OFF)
K3 energized - K3(1) OPEN
N7 X
Reset switch is/was momentarily
energized
K4 energized - K4(1) CLOSE (locking circuit)
N8 X
High Limit is satisfied.
(Amber HIGH PRESS OFF)
K4 energized - K4(1) OPEN
N9 X same as “state A”
N10 X
High limit is satisfied and reset
switch energized
K3(2) CLOSE
N11 X
Aux Water level is satisfied and
reset switch energized
K4(2) CLOSE, K5 energized
N12 X Air intake blower receiving power K5(1) CLOSE
N13-N17 remain OFF
Air Pressure Switch Satisfied: (STATE D)
Assume water level control “LLCO” is satisfied (LLCO contacts closed)
N1 thru N12 same as “Reset Engaged: (state C)"
LED
STATUS
DESCRIPTION ELECTRICAL COMPONENTS CONDITION
ON OFF
N13 X Air pressure switch satisfied 24V to ignition
module (term 6)
N14 X Ignition module PV coil energized PV CLOSE, 24V to K7
N15 X
Pilot gas valve is energized.
Note:
N15 and the pilot gas valve will
be ON for approximately 15 seconds,
then turn OFF.
K7 energized K7(1) CLOSE, relay board timer
circuit energized and starts time count. K6
energized K6(1) CLOSE, pilot gas valve coil
energized for 15 sec. only.
N16 X
Ignition module PV coil energized,
pilot ignition flame is detected
MV CLOSE, 24V to water level board LLCO
contacts
N17 X
Water level board LLCO is satisfied
and main gas valve is receiving
power.
Main gas valve coil energized, main burner
lights and flame continues to be detected.
Burner ON, Boiler Heating to generate steam: (STATE E)
All LED’s ON except N6 & N8, N15 (still OFF from state D)
Burner OFF, Boiler Pressure Satisfied: (STATE F)
These LED’s should be OFF - N6, N8, N9, , N10, N11, N12, N13, N14, N15 (still OFF from state D) N16 & N17
These LED’s should be ON - N1 thru N5, N7