UTICA BOILERS UHSW Series Installation, Operation & Maintenance Manual page 27

Figure 16 - Main Burner Flame
Main burner flame should form sharp blue inner mantel
with no yellow.
CHECKING AND ADJUSTING
Adjust Thermostat Heat Anticipator
Instruction for final adjustment of thermostat are packaged
with thermostat.
1. Set Heat anticipator at .2.
2.
Check thermostat operation. When set above
temperature indicated on thermometer, boiler burners
should ignite. Verify thermostat turns off boiler when
room temperature reaches selected setting and starts
boiler operating when room temperature falls few
degrees. After setting limit control to desired setting,
check to see if it shuts off gas supply to burners.
3. Turn your thermostat up to call for heat and let your
boiler run until temperature of water reaches limit
setting. Gas valve shuts off and circulator keeps
running until thermostat is satisfied, or water cools
enough to restart burners through limit control.
4.
To check operation of contacts in pressure switch,
disconnect rubber tubing (located between blower and
pressure switch) from pressure switch, while boiler
is operating. Burners extinguish and blower keeps
running. When tubing is reconnected to pressure
switch, ignition sequence begins, resulting in ignition of
main burners.
5.
Set thermostat for desired temperature.
Safe lighting and other performance criteria were met with
gas manifold and control assembly provided on boiler when
boiler underwent tests specified in ANSI Z21.13.
27
PN 240012689 Rev. A [05/15/2019]