AERCO RECON 1000 - Manual (Page 63)

RECON Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
OMM-0103_0A AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 Page 63 of 178
GF-147 Phone: 800-526-0288 PRI: 10/28/2014
Reassembly after Combustion Calibration
1. Set the ON/OFF switch in the OFF position.
2. Disconnect AC power from the unit.
3. Shut off the gas supply to the unit.
4. Remove the manometer and barbed fittings and reinstall the NPT plug using a suitable pipe
thread compound.
5. Remove the combustion analyzer probe from the 1/4” vent hole in the exhaust manifold.
Replace the 1/8” NPT plug in the manifold.
6. Replace all sheet metal enclosure panels on the unit.
4.4 TEMPERATURE CONTROL CALIBRATION
Carefully follow the procedures below to properly set up the temperature control for the heater.
Ignoring this commissioning step may cause water temperature faults, poor water temperature
control, and rapid cycling of the heater.
The unit normally comes factory set and calibrated for a 130°F setpoint (default value). However,
if a different setpoint temperature is desired, it can be changed using the procedure in section
4.4.1. If the setpoint is changed, it must be done prior to temperature control calibration.
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:
Temperature Control Calibration
1. The unit must be in the Auto mode of operation.
2. The Outlet Feedback option in the Tuning Menu must be set to DISABLED while performing
calibration.
3. Monitor the OUTLET TEMPERATURE display and VALVE POSITION bar-graph to set load
conditions and observe the effect of adjustments.
4. Perform the calibration using the Tuning Menu of the C-More Control Box.
5. Make small adjustments and allow time between adjustments for the outlet water 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.
8. Upon completion of calibration, set the Outlet Feedback back to ENABLE.
Temperature control calibration is accomplished by performing the Minimum and Maximum Load
Adjustment procedures in sections 4.4.2 and 4.4.3, respectively.