Low Water Cutoff Function: Reset And Test - IBC SL 14-115 G3 Installation And Operating Instructions Manual

LED 1 LED 2
Rapid Flash Rapid Flash
Off Off
Off On
On On
Rapid Flash On
Off Flashing
Flash Alternately
Flash Alternately with LED 1
with LED 2
5-4
SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS
The SIM's two status LEDs indicate the operating status as shown in the table below.
Status Indicators
STATE
Power up or Resetting
Standby
Pre-Purge or Inter-Purge
Heating
Igniting
Lockout
Fail-Safe
Table 10: Status indicators
The SIM is continuously communicating with the boiler's main controller reporting sensor
readings and status. The sensor readings and error status (if any) are displayed on the
boiler controller's screen.

5.2.4.1 Low water cutoff function: reset and test

The low water cutoff (LWCO) function provides continuous protection against a low water
incident.
If the SIM detects a low water incident, the boiler goes into a lockout condition. Here, you
will need to reset the boiler. To test the LWCO on the boiler, you can also manually place
the boiler in a lockout condition.
Resetting the boiler after a LWCO lockout
Before you reset the boiler, ensure that the boiler is pressurized and that the air has been
removed.
1. On the touchscreen controller, tap the Home screen.
On the Main Menu, tap the Diagnostics button.
2.
Tap the Advanced Diagnostics button.
3.
Tap the Clear Errors button.
4.
Tap the Yes radio button, and then tap OK.
5.
The system clears the errors, and resets the boiler.
Testing the LWCO function
1. On the touchscreen controller, tap the Home screen.
On the Main Menu, tap the Diagnostics button.
2.
DESCRIPTION, LED STATUS
INDICATION
Startup checks and initialization
LED1 Off = No Flame or Sparking
LED 2 = Burner-On Call state
LED1 Off = No Flame or Sparking
LED 2 = Burner-On Call state
LED 1 On = Flame detected
LED 2 = Burner-On Call state
LED 1 flashing = Electrode Sparking,
LED 2 = Burner-On Call state
An operating limit was exceeded or a
sequence failed or an external sensor
fault was detected.
A critical internal fault was detected.
INSTALLATION AND OPERATION INSTRUCTIONS