AERCO KC1000 Water Heater July 2011 - Manual (Page 33)

INITIAL START-UP
4-5
BLOWER
OUTLET
BLOWER
INLET
SCREEN
SHUTTER
SHUTTER
LOCKING NUTS
Figure 4.4
Air Shutter Locking Nut Location
REMINDER:
At 30% valve position, adjust only the differential
pressure regulator. At 100% valve position,
adjust only the inlet air shutter.
25. If the measured oxygen reading is above the
oxygen range in Table 3 (or 3A), loosen the
two 7/16" locking nuts securing the inlet air
shutter. Close the air shutter 1/4” to 1/2” to
decrease the oxygen level and tighten the
two nuts.
26. Allow the analyzer to settle then compare
the new oxygen reading to Table 3 (or 3A).
27. Repeat the adjustment until the oxygen is
within the specified range. Also, ensure that
the CO and NOx readings do not exceed the
values shown. Firmly tighten the inlet air
shutter locking nuts when finished.
NOTE:
Adjust the inlet air shutter only at 100% valve
position. Do Not adjust the differential pressure
regulator.
28. Change the valve position to 30%. Allow
time for the combustion analyzer to settle.
Check the measured oxygen level, CO and
NOx emissions to ensure that they are still
within the ranges shown in Table 1.
29. Continue these procedures until all oxygen
levels are within the ranges specified in
Tables 1, 2, 3 (or 3A).
30. Record all readings on the AERCO start-up
sheet provided with each unit. Proceed to
paragraph 4.5 when all natural gas
combustion calibration procedures are
completed.
IMPORTANT
The unit is shipped from the factory set up for
either natural gas or propane, as specified by
the Style No. on the Sales Order. If desired, the
unit can be easily switched from one fuel to the
other using the regulator spring change
procedure in Appendix I.
Since the required gas supply pressures for
propane differ from those required for natural
gas, the Propane Combustion Calibration
procedures are repeated in their entirety in
paragraph 4.4.
4.4 PROPANE COMBUSTION
CALIBRATION
The KC-1000 is shipped combustion calibrated
from the factory. Recalibration as part of a start-
up is necessary due to differences in altitude,
gas BTU content, gas supply piping and supply
regulators. Factory test data sheets are shipped
with each unit as a reference.
Prior to starting these procedures, ensure that
the KC1000 has been set up as specified in
paragraphs 4.2 through 4.2.4.
The following combustion calibration procedure
closely follows the factory procedure. By
following this procedure, readjustment of
combustion will be kept to a minimum.
1. Open the supply and return valves to the
unit and ensure that the system pumps are
running.
2. Open the gas supply valve(s) to the unit.
3. If a lockup style regulator is installed as a
gas supply regulator, adjust the gas supply
until a reading of 11” W.C. static pressure is
obtained.
4. Set the ON/OFF switch to the OFF position.
Turn on AC power to the unit. The display
will show LOSS OF POWER and the time
and date.