AERCO Esteem O&M Manual - Manual (Page 82)

76
GF-125
b 29
Blower Assembly Control module detects unwarranted blower oper- ation.
•
Verify the wiring from the blower to Control module is correct as shown in the appliance wir- ing schematic, page 27 and 28.
•
Contact AERCO International Technical Support if problem is not resolved.
b 30
High Temperature Limit, Boiler
Supply and Return
Temperature Differential is greater than 72ºF Temperature difference between the supply and the return sides of the primary boiler water is greater than 72
ºF, the
burner shuts down for 180 seconds. The circula- tor continues running until the start of the next cycle. If the condition is not cor- rected during the next cycle, the burner shut down period will increase by an additional minute. The boiler will continue for 15 cycles until a “hard “ lockout will occur.
•
Occurs if the flow rate and demand on the boiler is too low. Check the following: •
Verify the boiler and heating system are filled with water and the LWCO is operating prop- erly.
•
Ensure the boiler and heating system have been properly purged and there is no entrapped air.
•
Inspect and verify heating system piping and its components. Ensure piping is per the rec- ommendations given in this Installation Manual or per other approved/recognized designed configurations.
•
Ensure the piping system pressure drop is within the flow rate parameters of the circula- tor.
•
Verify the boiler space heating circulator is operating properly. •
Verify 120V at the circulator wiring in the circulator junction box. If no voltage is mea- sured, check circulator wiring and connections.
•
Verify 120V at the 120V Terminal strip terminals 1 and 2 inside the boiler enclosure. Check circulator wire harness if voltage is measured at Control module.
•
Verify the external DHW circulator is operating properly. •
Verify 120V at the circulator wiring in the circulator junction box. If no voltage is mea- sured, check circulator wiring and connections.
•
Verify 120V at the 120V terminal strip between terminals 4 and 5 inside the boiler enclo- sure. Check circulator wire harness and replace if needed if voltage is measured at Control module.
b 33
Indirect Water Heater Temperature Sensor Control module detects a short of the indirect water heater temperature sen- sor.
Burner will remain off until the condition is corrected. •
Review parameter setting for DHW operating signal selection. See the Esteem
Control
Application Supplement GF-125C for proper selection.
•
Inspect the DHW temperature sensor and wiring, ensure it is secure and in good condition. •
Replace the sensor if problem persists.
b 35
Flue Temperature Sensor Control module detects a short of the flue tempera- ture sensor.
Will also appear briefly prior to a hard lockout if the flue gas temperature exceeds 250
ºF. The
burner will remain off until the condition is corrected. •
Inspect the flue temperature sensor and wiring, ensure it is secure and in good condition.