U.S. Boiler Company K2, Installation Instructions Manual

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11) Start the boiler using the lighting instructions on page 97. With the boiler powered up, and with no call for heat, the
display should look like Figure 11.2a. Once a call for heat is present, it will look like Figure 11.2b.
12) The boiler should attempt to fire approximately 30 seconds after a call for heat appears. With the upper front cover
removed from the boiler, this try for ignition will appear as an audible spark (lasting approximately 4 seconds) and an
audible click from the gas valve. Upon initial start-up, the gas train will be filled with air. Even if the gas line has been
completely purged of air, it may take several tries for ignition before a flame is established. If the boiler does not light
after four tries for ignition, it will enter a “soft lockout” and will wait for one hour before attempting another ignition
sequence. This soft lockout can be reset by interrupting power to the boiler for a few seconds. Once a flame has been
established for the first time, subsequent calls for burner operation should result in a flame on the first try.
13) If there is a problem that appears before the first try for ignition, or if the boiler fails to light after four tries for ignition,
the blinking red screen with “HELP” highlighted on the Home screen (Figure 11.2c). Touching this “HELP” button will
take the user to the Diagnostics menu where the cause of the problem can usually be found by pressing the flashing button
on each successive screen. For more information, see Operation Manual.
14) Inspect the flame visible through the window. On high fire the flame should be stable and mostly blue (Figure 11.3). No
yellow tipping should be present; however, intermittent flecks of yellow and orange in the flame are normal.
15) Check the inlet gas pressure. Verify that the inlet gas pressure is between the upper and lower limits shown on the rating
plate with all gas appliances on and off.
Figure 11.1: Location of Manual Air Vent
XI. Start-Up and Checkout
(continued)