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Appendix C - (continued)
XV
– Troubleshooting
Enough Hot
Water Flow?
Boiler
Running?
No
Check to see if hot water flowrate is greater than 0.54 gpm.
No
In DHW settings, enable priority.
DHW
priority
on?
Yes
No
No
Flow switch
installed
correctly?
Yes
No
Flow switch
wired
correctly?
Arrow on flow switch should point in direction of flow.
(from mix valve to sweat connection)
Check connections on low voltage PCB.
Check for continuity between flow switch leads (with
flow turned on). If no continuity replace flow switch.
Yes
XVI
– Service, Maintenance and Inspection
•
Monthly – Inspect all water and gas lines for leaks. Contact technician for service.
•
Annual – Use thermometer to verify proper mixing valve operation.
•
Annual –
WARNING
Follow boiler shut down procedure in the preceding Sections of this manual before cleaning.
Flush DHW loop to remove scaling. Vinegar can be used to remove scaling.
•
Periodic – Consult mixing valve manual for maintenance instructions.
XVII
– Flat Plate Heat Exchanger Replacement
1. Unscrew control panel assembly from front and tilt back ensuring wire harness connections are removed to avoid
damaging them. Unscrew top and bottom flat plate heat exchanger connections including bottom fasteners. Loosen
“S” pipe attached to circulator to facilitate remove of flat plate.
2. Pull Flat Plate Heat Exchanger from boiler. Install new heat exchanger in reverse ensuring gaskets are installed. For
replacement gaskets, see Section XV “Repair Parts”.
3. Connect Wire Harness and Re-Install Control Panel ensuring no wires are pinched between panel and front frame.