Watts Aerco Innovation 800 User Manual page 99

Innovation Hot Water Hot Water Boiler User Manual
TABLE 7-1. HOT WATER BOILER TROUBLESHOOTING – Continued
FAULT INDICATION
LINE VOLTAGE Line and Neutral switched in AC
1.
OUT OF PHASE Power Box.
Incorrect power supply
2.
transformer wiring.
LOW GAS Incorrect supply gas pressure.
1.
PRESSURE
Defective Low Gas Pressure
2.
switch.
LOW WATER Insufficient water level in system.
1.
LEVEL
Defective water level circuitry.
2.
Defective water level probe.
3.
MODBUS COMM Unit not seeing information from
FAULT Modbus network.
PURGE SWITCH A/F Valve rotated open to purge
1.
CLOSED and did not rotate to ignition
DURING IGNITION position.
Defective or shorted switch.
2.
OMM-0120_0A
GF-128-I
CHAPTER 7 – TROUBLESHOOTING GUIDE
PROBABLE CAUSES
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
- INTERNATIONAL
CORRECTIVE ACTION
Check hot and neutral in AC Power Box to ensure they are not
1.
reversed.
Check transformer wiring, in AC Power Box, against the power
2.
box transformer wiring diagram to ensure it is wired correctly.
Measure gas pressure upstream of the SSOV Actuator(s) with
1.
the unit firing. Ensure it is between 4.0" W.C. (996 Pa) and 14"
W.C. (3.49 kPa) (see section 2.10.1).
Measure gas pressure at the Low Gas Pressure switch. If it is
2.
greater than 2.6" W.C. (647 Pa), measure continuity across the
switch and replace if necessary.
Check system for sufficient water level.
1.
Test water level circuitry using the Control Box front panel LOW
2.
WATER TEST and RESET buttons. Replace water level
circuitry if it does not respond.
Check continuity of probe end to the shell, change probe if there
3.
is no continuity.
Check network connections. If fault persists, contact qualified
Service Personnel.
Start the unit. The Air/Fuel Valve should rotate to the purge
1.
(open) position, then back to ignition position (towards closed)
during the ignition cycle. If the valve does not rotate back to the
ignition position, check the Air/Fuel Valve calibration. If
calibration is okay, the problem may be in the Air/Fuel Valve or
the Control Box. Refer fault to qualified service personnel.
If the Air/Fuel Valve does rotate to the ignition position, check
2.
the purge switch for continuity between the N.O. and COM
terminals. If the switch shows continuity when not in contact
with the cam, check to ensure that the switch is wired correctly
(correct wire numbers on the normally open terminals).
Page 99 of 174
11/15/2016