AERCO AM Series Boiler Cascade Sequencer Controller - Manual (Page 24)

AM Series Cascade Sequencer
INSTALLATION AND OPERATION MANUAL
2.6 Troubleshooting Guide
Below is a list of possible issues and corrective actions.
Troubleshooting Guide
Issue Corrective Action
Cannot set the unit address
when installing cascade
sequencer
OR
When trying to set the unit
address, the new address
does not appear on the
cascade sequencer.
• Double check all wiring.
• Ensure settings and switches are correct as per Figure 1-18.
Cascade system does not
seem to be communicating
correctly.
• Double check all wiring.
• Ensure settings and switches are correct as per Figure 1-18.
• Make sure that all units show up under the Cascade Status
menu.
When trying to set the unit
address, “#5” appears on all
units.
This may indicate incorrect software in the communications
module. Contact AERCO technical support for further
information.
Domestic water heating tank is
not reacting quickly.
Check that the parameters are all set according to the “Water
Heater Settings”.
System loop is not reaching
desired setpoint.
• Check the location of the cascade header temperature
sensor. Ensure that the sensor is located such that it will
see flow from both the primary and secondary loops.
• Check parameters 1120-1123 on each unit. Ensure that all
modules are running at maximum capacity. If not, wait 10
minutes for burners to modulate up and check again.
• Change System Correction factor from 14 to 22.1.
• Check each unit’s outlet temperature on the individual boiler
or water heater interface. If Cascade Setpoint + Max Offset
Up is less than or equal to any individual unit’s outlet
temperature, increase the Max Offset Up parameter.
Outdoor air temperature
sensor on cascade sequencer
shows “-40”.
• Check that the sensor is wired to terminals 14 & 15 of the
master boiler.
• Make sure all electrical connections are tight.
• Check sensor resistivity.
Cascade sequencer header
temperature displays a low
value (10-16°F).
Check that the cascade header temperature sensor is
installed in terminals 24 & 25 of the master boiler or water
heater.
Page 24 of 26 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0101_0A
PRI - 11/25/14 Ph.: 800-526-0288 GF-146-CS