Watts AERCO AM Series Quick Installation Manual page 7

Quick Installation Guide
AM Series
Combustion Calibration
COMBUSTION CALIBRATION
1. Follow vent pipe manufacturer's instruction to install combustion analyzer probe 8" after the flue gas exhaust connection.
2. Start unit per procedure on this page.
3. Set unit to standby: Press A (boiler) or S (water heater) until "OFF" is displayed
4. Set Para 2201 (AM 399-1000) or 2010 (AM 199/250) to HIGH
5. Generate demand: Press C (boiler) or R (water heater) until setpoint is above "OFF" (e.g. 90F)
6. Wait 2-3 min. for CO2 to stabilize.
7. Compare CO2 reading with high fire range in Table below, making sure to use the range for gas type in use. If CO2 reading is outside the range,
use screw E (2.5mm Allen) to adjust: CW to reduce CO2, CCW to increase CO2. Adjust in small increments and wait for CO2 to stabilize in between
readings.
8. Set Para 2201 OR 2010 to LOW.
9. Wait 2-3 min. for CO2 to stabilize.
10. Compare CO2 reading with low fire range in Table below, making sure to use the range for gas type in use. If low fire CO2 reading is outside the
range, STOP the unit and call the Factory service department.
11. Set Para. 2201 or 2010 to OFF.
12. AM 399-1000: repeat steps 3-9 for burners 2, 3 and 4 as applicable, using parameters 2202-2204 to calibrate each burner in turn.
13. Close the combustion analyzer probe.
QIG-0001_0A • 11/1/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
GAS SUPPLY PRESSURE TEST
1. Close the manual gas shutoff valve.
2. Remove the front cover.
3. Turn inlet pressure port D screw three turns CCW.
4. Connect manometer to port D.
5. Open the manual gas shutoff valve.
6. Check gas pressure does not exceed 13" W.C. Adjust upstream
gas regulator as needed.
7. Turn power switch ON.
8. Generate heat demand: press C (boiler/water heater) or R
(indirect water heater) to its maximum setting.
9. Set Para 2200 (AM 399-1000) or 2010 (AM 199/250) to HIGH
10. Check gas pressure is between 3"-13" W.C. Adjust upstream
gas regulator as needed.
11. Return Para. 2200 or 2010 to OFF
12. Close the manual gas shutoff valve.
13. Disconnect the manometer.
14. Turn port D screw CW until snug and check it for any gas
leaks.
Page 7 of 7