Weil-McLain GV90+ - Integrated boiler control (IBC) sequence of operation - status light indications

Part number 550-142-903/1016
66
&IGURE Integrated boiler control (IBC) sequence of operation — status light indications
STEPS
(After Step 9, the cycle goes back to
Step 1)
#ALL
FOR
(EAT
POWER
TSTAT
CIRC
LIMIT
PRESS
SWITCH
FLAME
SENSOR
GND
4IMING
 3TANDBY
s Waiting for call for heat
NO
—
 #ALLFORHEAT
s Circulator on
YES
—
 ,IMITCIRCUIT
s Limit controls closed
s Block switch contacts
closed
s Blower on
YES
—
 0RESSURECIRCUIT
s Pressure switch contacts
closed
s Ignitor glows
YES
30 sec
 &LAMEPROVEN
s Gas valve open
s Ignitor remains on
YES
4 sec
 ,IMITCYCLE
s Limit circuit open
s Gas valve closed
s Blower off after postpurge
YES
30 sec
 &LAMEOUTAGE
s Flame out
YES
—
 4HERMOSTATSATISlED
s Circulator off
s Blower postpurge
s Return to Step 1
NO
30 sec
 3ENSOR'ROUND
s Sensor ground circuit
open.
YES/
NO
—
/. /&&
* If flame is not proven in
4 seconds, boiler recycles 2 times to retry for ignition before going into lockout. Recycle igniter timing
is 30 seconds. Postpurge and prepurge are performed on every cycle. In event of lockout, ignition control will automatically
restore sequence of operation after either:
 sHOURWAITINGPERIOD
 s/PENINGANDCLOSINGOFTHERMOSTATCIRCUIT
 s2EMOVALOF6!#POWERFORATLEASTSECONDS
GV90+ Series 2 GAS-FIRED WATER BOILER — Boiler Manual
Start-up (continued)