Lochinvar EFW 85 Installation, Commissioning, User And Maintenance Instructions page 81

# Burner state
0 INIT
1 RESET
2 STANDBY
3 PRE_PURGE_0
4 PRE_PURGE_1
5 PRE_IGNIT
6 IGNIT
7 FLAME_PROVING
8 BURN
9 POST_BURN
10 POST_PURGE_0
11 POST_PURGE_1
12 ERROR_CHECK
13 ALARM
14 BURNER_BOOT
During the ignition cycle multiple safety checks are active
False flame detection
If flame is detected at the end of the pre-spark period (Pre_Ignit) a lockout error will occur.
Re-ignition
If at the end of the safety period no flame is detected the control will go to Post_Purge to
remove any unburned gas. After this a re-ignition attempt is started following the same
cycle.
The number of re-ignition attempts is limited to Max_Ignit_Trials after which a lockout oc-
Sparking stops in the Flame_Proving state to allow for ionization detection. The
Flame establishing
curs.
time Flame_Proving state takes Safety_Period - Ignit_Period.
Flame out too late If at the end of the Post_Purge 0 state the flame is still detected a lockout follows.
When a flame is lost during a burn cycle the control will restart the burner. The number of
Flame loss
restarts is limited by the Max_Flame_Trials setting.
The fan speed is continuously monitored.
Fan supervision
The following conditions for the fan speed are checked:
Actions
▪
Controller initialization
▪
Software reset (and initialization)
▪
Standby (waiting for demand)
▪
Fan is not running
▪
When an APS is enabled the APS position is checked
▪
Fan starts at ignition speed
▪
When an APS is enabled the APS position is checked
▪
Fan stays at ignition speed
▪
Igniter is started
▪
When a LPG tank is selected, the tank valve is opened
▪
Fan stays at ignition speed
▪
The gas valve is opened
▪
Igniter stays on
▪
When a LPG tank is selected, the tank valve stays opened
▪
Fan stays at ignition speed
▪
The gas valve stays opened
▪
The igniter is stopped
▪
When a LPG tank is selected, the tank valve stays opened
▪
The fan is modulating
▪
The gas valve stays opened
▪
When a LPG tank is selected, the tank valve stays opened
▪
When an APS is enabled the APS position is checked
▪
Fan is set to minimum speed
▪
The gas valve stays opened
▪
The fan is set at ignition speed
▪
The gas valve is closed
▪
When a LPG tank is selected, the tank valve is closed
▪
Fan stays at ignition speed
▪
When an APS is enabled the APS position is checked
▪
Blocking error is set
▪
Checking if blocking error can be removed (error situation is solved)
▪
Lockout error is set
▪
User must reset the lockout error (and the controller will reboot)
▪
Finalize processes and reboot the control
▪
The actual fan speed must be within 300RPM of the target fan speed
▪
When the fan speed duty cycle is within the lower/upper 5% of the PWM duty cycle
range no errors will be generated since the fan is in the limits of its working range.
E93.1804.014
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