User Manual

RECON Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
Page 60 of 178 AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 OMM-0103_0A
PRI: 10/28/2014 Phone: [phone] GF-147
4.3 NATURAL GAS COMBUSTION CALIBRATION
The RECON Heater is combustion calibrated at the factory prior to shipping. However,
recalibration is necessary as part of initial start-up due to changes in the local altitude, gas BTU
content, gas supply piping and supply regulators. Start-Up & Registration Test Data sheets are
shipped with each unit. These sheets must be filled out and returned to AERCO for proper
Warranty Validation.
It is important to perform the calibration procedure as outlined below. This will keep
readjustments to a minimum and provide optimum performance.
NATURAL GAS Combustion Calibration
1. Open the water supply and return valves to the unit and ensure that the system pumps are
running.
2. Open the natural gas supply valve to the unit.
3. Set the control panel ON/OFF switch to the OFF position
4. Turn on external AC power to the unit. The display will show LOSS OF POWER and the time
and date.
5. Enter the password 6817 to continue.
6. Set the unit to manual mode by pressing the AUTO/MAN key. A flashing manual valve
position message will be displayed with the present position in %. Also, the MANUAL LED will
light.
7. Adjust the air/fuel valve position to 0% by pressing the ▼ arrow key.
8. Ensure that the leak detection ball valve downstream of the SSOV is open.
9. Set the ON/OFF switch to the ON position.
10. Change the valve position to 30% using the ▲ arrow key. The unit should begin its start
sequence and fire.
11. Using the ▲ arrow key, increase the valve open position to 100% and then allow the valve
position to reach 100%.
12. Check that the gas pressure downstream of the SSOV is within the range listed below. If gas
pressure adjustment is required, remove the brass hex nut on the SSOV actuator (see Figure
4-4) to access the gas pressure adjustment screw. Slowly rotate the gas pressure adjustment
screw, in approximately 1/4-turn increments, clockwise to reduce the oxygen level or
counterclockwise to increase the oxygen level, as needed, to reach the value listed below.
Allow the combustion analyzer to stabilize following each adjustment.
Final Gas Pressure at High Fire
RECON 500 2.0”
± 0.1 W.C.
RECON 1000 3.0” ± 0.1 W.C.