HeatStation™ CONDENSING WATER BOILER
49
34-1161 05/17
With the burner firing, measure the flow gas pressure at the beginning of the gas train. If the inlet flow gas pressure
for Natural Gas is equal to or greater than 3.5 inches water column, continue with the startup. If the inlet flow gas
pressure drops below these minimum requirements, a supply gas volume or piping problem may exist and must
be corrected before the startup can continue.
Next, with the burner firing, monitor the combustion analyzer readings. The desired Carbon Dioxide level, CO2,
in the combustion products must be between 8.0 and 9.0% for Natural Gas.
The Heatstation uses a modulating burner control system with an integrated dual gas valve and zero governor
regulator which proportionally matches the blower air. The CO2 level must be adjusted at both Low Fire and High
Fire. The firing rate adjustment is done in the Manual Override Menu accessed through the EOS Touch Screen
Digital Control.
To access the Manual Override Menu:
a. Press and hold the
HOME
button for 3 seconds.
b. Touch the
NEXT ITEM
or
ITEM BACK
buttons to navigate to the
TOOLBOX
menu.
c. Touch the
ENTER
button to display the
ACCESS
screen.
d. Now press and hold the number 4 button to select the
ADVANCED
setting.
e. Exit the menu by pressing the
HOME
button.
f. Use the
NEXT ITEM
or
ITEM BACK
buttons to navigate to the
OVERIDE
menu.
g. Touch the
ENTER
button to display the
MANUAL OVERRIDE
screen and use
UP or DOWN
arrow buttons
to select the
HAND
setting.
h. Use the
NEXT ITEM
or
ITEM BACK
buttons to navigate to the
HEATER MODULATION (HTR MOD)
menu.
This setting will override the operating control, and using the up or down arrow buttons, force the burner to
fire at a selected firing rate.
NOTE:
If the
HTR MOD
program is activated while the burner is firing, the burner
will shut down and recycle.
i. Using the
UP or DOWN
arrow buttons adjust the firing rate from
OFF
to the minimum firing rate of
10%
for
Low Fire.
j. If the CO2 levels at
Low Fire
are within the the tolerance make no adjustment here and skip to step k.
With the burner firing rate stabilized at
Low Fire
, adjust the
Gas Regulator Screw
clockwise to increase gas
flow and increase CO2, or counter-clockwise to decrease flow and decrease CO2.
k. Once the desired combustion levels are achieved at
Low Fire
, return to the Touch Screen and increase the
HTR MOD
firing rate to the maximum
High Fire
firing rate setting allowed for the specific product.
NOTE:
The maximum factory-set
High Fire
firing rate may not be 100%.
l. If the CO2 levels at
High Fire
are within the the tolerance make no adjustment here and skip to step m.
With the burner firing rate now stabilized at
High Fire
, turn Valve Orifice Adjustment screw clockwise to
decrease gas flow and decrease CO2, or counter-clockwise to increase gas flow and increase CO2. Be sure
to tighten the set screw on the valve body when adjustments are complete.
m. Once the desired combustion is reached at
High Fire
, return to
Low Fire
to confirm the settings again.
n. When all combustion adjustments are complete, go back to the
MANUAL OVERRIDE
screen and return the
function back to the
“AUTO”
setting.
5. Check The Vent Pressure
With the combustion properly adjusted, now use the test hole in the flue vent to measure the vent pressure. With
the burner firing,
confirm the vent pressure does not exceed 1.0” W.C. Pressure in excess of 1.0” W.C. indicates
a venting sizing issue that must be addressed by the installer before operating the boiler.
WARNING: When adjustments are complete and before putting the boiler into service, return the MAN
OVR function back to “AUTO”. Failure to return the MAN OVR function to “AUTO” can cause high water
temperatures that can result in property damage, scalding, other serious injury or death
.
