Dunkirk GWB9-050IH-2, Installation Instructions Manual

Page: 43 / 56

43
CHECK OUT PROCEDURE AND ADJUSTMENT
F. After adjusting input rate, turn boiler off, remove
manometer or pressure gauge, reinstall ⅛ ” plug
on gas valve. Turn boiler on.
G. Boiler should typically operate between:
• 8.5% -10.0% CO2 on Natural Gas
• 9.5% -11.0% CO2 on Propane Gas
Under all conditions CO level should not exceed 100
ppm.
9.
Restore all gas appliances that may have been shut off
(while measuring boiler input rate) to normal operating
conditions.
I. Remove regulator cover screw on top of gas valve,
and insert an appropriate screwdriver into adjustment
screw.
II. Turn adjustment screw clockwise to increase input
rate, or counter clockwise to decrease input rate.
III. Replace cover screw, or cover hole temporarily with
your fi nger to check new manifold pressure setting. Do
not set manifold pressure lower than 2.0 inches w.c.
or higher than 3.0 inches w.c. when adjusting input
rate.
IV. Measure new input rate (cover screw must be
installed). Repeat steps I.-IV until the input rate is
/-2% of the nameplate input rating.
V. If the actual input rate can not be set to within 2%
of the correct input rating by adjusting manifold
pressure, a change in gas ori fi ce size is required.
Consult the boiler manufacturer for information on
correct ori fi ce sizing. The speci fi c gravity (G) and the
higher heating value (HHV) of the local natural gas
must be obtained from the local gas utility in order to
determine the proper ori
fi ce size.
Set Thermostat To Desired Room Temperature
Observe several operating cycles to verify proper operation.
Review All Instructions
Review all instructions shipped with this boiler with owner
or maintenance person. Instructions must be af fi xed on or
adjacent to the boiler.
Complete and sign the “Installation and Check-Out
Certifi cate” on page 54
.