AERCO KC Series Equipped with C-More version 3.04 - Manual (Page 38)

INITIAL START-UP
4-8
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, outlet water temperature must be
allowed to settle for several minutes prior to making 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.
5. Make small adjustments and allow time between adjustments for the outlet temperature to stabilize.
6. Maintain water flow as constant as possible during these adjustments.
7. Ensure that recirculation loops are operational while the calibration is being performed.
4.6.1 SETTING THE OUTLET WATER TEMPERATURE SETPOINT
The setpoint temperature of the unit may be changed by following the procedure below. However, once a
setpoint has been changed, recalibration may be necessary. The temperature calibration procedures are
provided in paragraphs 4.6.2 and 4.6.3
To adjust the unit’s setpoint, proceed as follows:
1. Press the MENU key until Configuration Menu is displayed.
2. Press the ▲ or ▼ arrow key until Internal Setpt is displayed along with the present setpoint
temperature.
3. To change the setpoint, press the CHANGE key. The display will begin to flash.
4. Press the ▲ or ▼ arrow key until the desired setpoint is displayed.
5. Press the ENTER key to save the change.
4.6.2 MINIMUM LOAD ADJUSTMENT
With the unit in operation, check the temperature control at minimum load as follows:
1. While monitoring the VALVE POSITION display, create a minimum load on the system that will yield a
steady valve position between 25% and 35%.
NOTE:
It may be desirable to shut off the outlet valve and use the hose bib to simulate a minimum flow load
condition.
2. Wait several minutes to allow the outlet temperature to stabilize under load conditions.