Filter
Top Products
VI
CTORY VSPH Models
21
THERMOSTAT CALLS FOR HEAT
CIRCULATOR ON
INDUCER (BLOWER) ON
VSPH BOILER SEQUENCE OF OPERATION
BOILER WATER TEMPERATURE IS
B
ELOW HIGH LIMIT SETTING?
PRESSURE SWITCH CONTACTS PROVED
OPEN WITHIN 45 SECONDS?
PRESSURE SWITCH CONTACTS CLOSED
WITHIN 5 MINUTES?
30 SECONDS PRE-PURGE PERIOD
TRIAL FOR IGNITION-15 SECONDS
PILOT VALVE OPENS. IGNITION SPARK STARTS.
PILOT LIGHTS AND FLAME IS SENSED
DURING TRIAL FOR IGNITION?
SPARK OFF. MAIN VALVE OPENS. BOILER HEATING PERIOD
STARTS
CONTROL CONTINUOUSLY MONITORS THERMOSTAT, HIGH
LIMIT, PRESSURE SWITCH AND FLAME SENSOR.
THERMOSTAT CALLS FOR HEAT ENDS.
CIRCULATOR OFF, PILOT AND MAIN VALVE CLOSE.
15 SECONDS POST PURGE
BOILER WAITS FOR NEXT CALL FOR HEAT.
CONTROL LOCKOUT
FLAME LED FLASHING.
1/2 HOUR WAIT PERIOD
PILOT LIGHTS AND
FLAME SENSED?
4 TIMES RE-TRIALS
FOR IGNITION
CONTROL RE-INSTATE
TRIAL FOR IGNITION
WITH 30 SECONDS
INTER-PURGE
CONTROL LOCKOUT.
POWER AND
PRESSURE
SWITCH LED’S
FLASHING.
1 HOUR WAIT
PERIOD.
NO
YES
NO
YES
YES
YES
YES
NO
NO
NO