Testing The Lwco Function - IBC VX Series Installation & Operating Manual

7. Check the results and confirm the correct settings when you return the boiler to high fire,
and then to low fire.
Note
Clock the gas meter to confirm full maximum rating plate input.
8. To exit the Test Operation screen, select Back.
9. Remove the call for heat.
10. If a manometer is connected to the gas valve inlet gas pressure port:
a. Turn off the gas supply at the external gas shut-off valve.
b. Disconnect the manometer.
c. Tighten the inlet pressure port screw with a Torx 15 screwdriver.
11. Remove the analyzer probe, and install the test port plug.
12. Turn on the gas supply shut off valve.
Fuel
Range %
Natural Gas
9.0 - 10.0
Propane
10.3 - 11.3
Table 11 Combustion test target ranges - CO

6.3.4 Testing the LWCO function

The low water cutoff (LWCO) function provides continuous protection against low water in the
boiler. If the SIM detects low water, the boiler enters a lockout state. Perform the test to ensure that
the LWCO sensor is functioning.
1. Press and hold the LWCO Test button for 5 seconds (located on top of the electrical box).
A message on the screen indicates that the boiler is in lockout mode.
2. Go to
> SIM Menu > LWCO Test > Read the instructions.
3. On the touchscreen controller, select the Reset button.
The message: "The SIM Module has been reset" is displayed.
4. Tap Close > Back to exit the test.
High fire
Target % Range %
9.5 8.2 - 9.2
10.8 9.3 -10.3
/ Maximum CO
2
68
Section: Boiler operation
CO max
Low fire
Target %
8.7
9.8
PPM
<150
< 250