INSTALLATION AND OPERATION INSTRUCTIONS
5-4
SL 26-260 G3, SL 40-399 G3 MODULATING GAS BOILERS
The SIM’s two status LEDs indicate the operating status as shown in the table below.
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 (locks).
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.
2. On the
Main Menu
, tap the
Diagnostics
button.
3. Tap the
Advanced Diagnostics
button.
4. Tap the
Clear Errors
button.
5. Tap the
Yes
radio button, and then tap
OK
.
The system clears the errors, and resets the boiler.
Testing the LWCO function
1. On the touchscreen controller, tap the Home screen.
2. On the
Main Menu
, tap the
Diagnostics
button.
3. Tap the
SIM
Module
button.
LED 1
LED 2
STATE
DESCRIPTION, LED
STATUS INDICATION
Rapid Flash
Rapid Flash
Power up or Resetting
Startup checks and initialization
Off
Off
Standby
LED1 Off = No Flame or
Sparking
LED 2 = Burner-On Call state
Off
On
Pre-Purge or Inter-Purge
LED1 Off = No Flame or
Sparking
LED 2 = Burner-On Call state
On
On
Heating
LED 1 On = Flame detected
LED 2 = Burner-On Call state
Rapid Flash
On
Igniting
LED 1 flashing = Electrode
Sparking, LED 2 = Burner-On
Call state
Off
Flashing
Lockout
An operating limit was exceeded
or a sequence failed or an
external sensor fault was
detected.
Flash Alternately
with LED 2
Flash Alternately with LED 1
Fail-Safe
A critical internal fault was
detected.
