Independence Installation, Operating, and Service Instructions

42
103538-08 - 3/18
K. Adjust gas input rate to boiler. Natural Gas.
WARNING
Failure to properly adjust gas input rate will
result in over ring or under ring of the boiler.
Improper and unsafe boiler operation may result.
1. Adjust thermostat to highest setting.
2. Check manifold gas pressure. Manifold pressure is
listed on Rating Label.
a. Models IN10-IN12 with Standing Pilot and
IN3I-IN11 with Electronic Ignition. Adjust gas
valve pressure regulator as necessary (turn
adjustment screw counterclockwise to decrease
manifold pressure, or clockwise to increase
manifold pressure). If pressure can not be
attained, check gas valve inlet pressure. If less
than minimum gas supply pressure listed on
Rating Label, contact gas supplier for assistance.
b. Model IN12 with Electronic Only.
i. Turn off gas valve not having pilot control.
ii. On gas valve with pilot control, adjust gas
valve pressure regulator to obtain required
manifold pressure, or if unattainable, highest
pressure without forcing adjustment screw
(turn adjustment screw counterclockwise to
decrease manifold pressure, or clockwise to
increase manifold pressure).
iii. Turn on gas valve not having pilot control.
Adjust gas valve pressure regulator to obtain
required manifold pressure. Manifold
pressure may not change during initial turns
of adjustment screw.
3. Clock gas meter for at least 30 seconds. Use Table
10 to determine gas ow rate in Cubic Feet per
Hour.
4. Determine Input Rate. Multiply gas ow rate by gas
heating value.
5. Compare measured input rate to input rate stated on
Rating Label.
a. Adjust gas valve pressure regulator, if necessary,
to change input rate (turn counter-clockwise to
decrease pressure and decrease input rate).
b. Contact your U.S. Boiler Company wholesale
distributor for alternate main burner orices if
outlet pressure is less than 3.2 inches water
column or greater than 3.8 inches water column.
Provide current orice size, outlet gas pressure
and measured input rate.
6. Recheck Main Burner Flame.
7. Return other gas-red appliances to previous
conditions of use.
L. Adjust gas input rate to boiler. LP/Propane.
1. Set thermostat to highest setting.
2. Adjust tank regulator for gas valve inlet pressure of
13.5 inches w.c. or less.
3. Gas valve has step opening regulator which initially
opens to 1.4 or 2.5 inch w.c. and steps to full
pressure after approximately 30 seconds. Check
manifold pressure after step has occurred. Adjust gas
valve pressure regulator as necessary for 10.0 inches
w.c. (turn adjustment screw counterclockwise to
decrease manifold pressure, or clockwise to increase
manifold pressure). If 10.0 inches w.c. can not be
attained, check gas valve inlet pressure. If less than
11.0 inches w.c., contact gas supplier for assistance.
M. Clean Heating System (Steam). A local qualied
water treatment chemical specialist is a suggested
source for recommendations regarding appropriate
chemical compounds and concentrations which are
compatible with local environmental regulations.
1. Oil from new piping connections and sediment in
existing piping must be removed from system to
prevent unsteady water line and carry-over of
entrained water into supply main.
a. Fill boiler to normal waterline.
b. Follow Lighting or Operating Instructions to
place boiler in operation. See Figure 38, 39 or
40.
c. Operate boiler with steam in entire system for
several days to bring system oil and dirt back to
boiler.
d. Drain condensate from drain valve in wet return.
Operate boiler until condensate runs clean.
2. Boil-out boiler.
a. Follow instructions TO TURN OFF GAS TO
APPLIANCE. See Figure 38, 39 or 40.
b. Fill boiler to normal waterline.
c. Remove safety valve.
d. Pour recommended boil-out compound into
boiler through safety valve opening.
e. Reinstall safety valve in Tapping "E" with
spindle in vertical position. See Figures 1 and 2.
f. Follow Lighting or Operating Instructions to
place boiler in operation. See Figure 38, 39 or
40. Check controls operation per Paragraphs F
to J. Boil water for at least 5 hours.
g. Follow instructions TO TURN OFF GAS TO
APPLIANCE. See Figure 38, 39 or 40. Drain
boiler and system piping.
IX. System Start-up (continued)