AERCO Esteem O&M Manual - Manual (Page 88)

82
GF-125
E 25
High Temperature Limit, Supply Temperature Rate of Increase Supply water temper- ature rate of increase is too rapid Control module will display
b 25
and start a recycle sequence. After 5 cycles a hard lockout.
Flow rate and demand load on the boiler are too low. Check for the following:
•
Boiler and heating system are filled with water and the LWCO is operating properly.
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Boiler and heating system have been properly purged and there is no trapped air.
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Inspect heating system piping and components. Ensure piping is per the recommenda- tions given in this manual or other approved design configuration.
•
Verify pump is properly sized for the flow rate required. See page 91 for pump curves and boiler pressure drops. Consult the circulator manufacturer for additional pump curve data or assistance in sizing a circulator.
•
Verify the boiler space heating circulator operation. •
Verify 120V at the circulator wiring in the circulator junction box. If no voltage is mea- sured, check wiring and connections.
•
Verify 120V between terminals 1 and 2 at the terminal strip inside the boiler enclosure. Check circulator wire harness. Replace if needed, if voltage is measured at Control mod- ule.
•
Verify the external DHW circulator operation. •
Verify 120V at the circulator wiring in the circulator junction box. If no voltage is mea- sured, check circulator wiring and connections.
•
Verify 120V between terminals 4 and 5 at the terminal strip inside the boiler enclosure. Check circulator wire harness. Replace if needed, if voltage is measured at Control mod- ule.
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Blower Assembly Occurs if blower does not start during igni- tion sequence.
Display indicates status code 5 during ignition sequence for 4 minutes before lock out. •
Disconnect the connector at the blower. Restart the boiler sequence and check for 35Vdc at the connector between the black and white wires (pin 1& 5). •
If 35Vdc is not present at the connector, inspect the wiring harness and replace if neces- sary. Replace Control module if wire harness replacement does not resolve the problem.
•
If 35Vdc is present at the connector, reconnect the wire harness to the blower and ensure a secure connection. If problem is not resolved, contact AERCO International Technical Support for additional assistance.
E 29
Blower Assembly
Control module is detecting the blower in operation when it should not be. •
Verify the wiring from the blower to Control module is correct as shown in the appliance wir- ing schematic, pages 27-28. •
Replace the wiring harness from Control module to the blower. Replace the blower if the replacement of the wiring harness does not resolve the problem. If problem is not resolved, contact AERCO International Technical Support for additional assistance.