AERCO KC1000 Heater Mar 2011 - Manual (Page 36)

INITIAL START-UP
4-8
22. Wait for the analyzer to settle and then
compare the new oxygen reading to Table 6
(or 6A). Repeat the inlet air shutter
adjustment until the oxygen is within the
specified range. Also, ensure that the CO
and NOx emissions do not exceed the
values shown. Firmly tighten the inlet air
shutter locking nuts when finished.
REMINDER:
At 30% valve position, adjust only the differential
pressure regulator. At 100% valve position,
adjust only the inlet air shutter.
23. If the measured oxygen reading is above the
oxygen range in Table 6 (or 6A), 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.
24. Allow the analyzer to settle then compare
the new oxygen reading to Table 6 (or 6A).
25. 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.
26. 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 4.
27. Continue these procedures until all oxygen
levels are within the ranges specified in
Tables 4, 5 and 6 (or 6A).
28. Record all readings on the AERCO start-up
sheet provided with each unit. Proceed to
paragraph 4.5 when all propane combustion
calibration procedures are completed.
4.5 UNIT REASSEMBLY
Once combustion calibration is set properly, the
unit can be re-assembled for permanent
operation.
1. Set the ON/OFF switch to the OFF position.
Disconnect the AC power supply from the
unit.
2. Shut off the gas supply to the unit.
3. Remove the differential pressure regulator
cap and cap gasket (see Figure 4.3).
4. Apply a drop of silicone adhesive to the
regulator adjusting screw to lock its setting.
5. Reinstall the cap and gasket on the
regulator. Tighten the cap using a
screwdriver or wrench.
6. Remove all of the manometers and barbed
fittings and reinstall the pipe plugs using a
suitable thread compound.
7. Remove the combustion analyzer probe
from the vent hole. Seal the probe hole and
replace the vent connection cover.
8. Replace the unit’s panels and hood.
4.6 TEMPERATURE CONTROL
CALIBRATION
Although the unit comes factory set and
calibrated for a 130 ° F setpoint it is usually
necessary to recalibrate temperature control.
There are two primary adjustments for
performing temperature calibration. These are
Min Load Adj and Max Load Adj (minimum and
maximum load adjustment).
Adjustments to these settings are made at
minimum and maximum load conditions and
should be made in small increments from 1 to 3
degrees. After making an adjustment, the outlet
water temperature must be allowed to settle for
several minutes prior to making any further
adjustments.
When calibrating temperature control, observe
the following:
1. The unit must be in the Auto mode of
operation.
2. The Outlet Feedback option in the Tuning
Menu must be off while performing
calibration.
3. Monitor the OUTLET TEMPERATURE
display and VALVE POSITION bar-graph
display to set load conditions and see the
effect of adjustments.
4. Perform the calibration using the Tuning
Menu of the Control Box.