Service manual

VSX SERIES STEAMER - ELECTRICAL OPERATION
Page 27 of 40
1S Power Switch
........ Controls electrical power to the control circuit and delime circuit.
2S Door Switch
.......... Removes electrical power to the timer when the door is opened and the control
thermostat is open.
1SOL Fill Solenoid
....... Controls tank water supply. (normally closed valve, water flows when energized)
2SOL Cold Water Solenoid
. Controls cold water supply going into drain to mix and condense exhaust steam.
(normally closed valve, water flows when energized)
GAS Valve Solenoid
...... Allows gas flow to burner when solenoid is energized. A normally closed valve.
(gas models only)
1TAS High Limit
Thermostat
............. Will not allow heater contactor (on electric models) or ignition module (on gas
models) to energize if the tank temperature goes beyond 125°C (257 F).
2TAS Control Thermostat
. . On electric models it cycles power to heater contactors. On gas models it cycles
power to the ignition control module. On either model, this will maintain the
steam generator tank set point temperature, when no time is on cook timer.
1TR Timer
.............. On electric models it controls the cold water solenoid and power to the heater
contactors. On gas models it controls the cold water solenoid and power to the
ignition control module. This occurs on either model after the tank reaches its set
point temperature and time is dialed into the timer. Also, energizes the buzzer
when time expires.
WLC (Water Level
Control Board)
........... Monitors water level probes to control the tank water level and heater contactors.
Individual LED’s on board light up when water level reaches LLCO and then HL
probes. When water level drops below one of these probes, LED goes out.