Camus Hydronics DRH1000, Installation, Operation And Service Manual

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49
PART 9 TROUBLESHOOTING
COMPONENT FAILURE MODE ANALYSIS
Incoming Power
• Two wires interchanged • No effect on safety
• Live and Neutral wires are interchanged.
Transformer
Tripped
• The 24Volts and 120 Volts wired
are interchanged
• Alert: 49
• Lockout: 53 • Breaker on transformer trips
Relief Valve
• System pressure exceeds relief
valve setting
• Replace the standard relief valve with a higher rated valve
up to the maximum pressure of the heat exchanger.
• Improperly sized expansion tank.
Flow Switch
• Flow Switch contacts are open
• Alert: 63, 275-281, 460
• LCI OFF • Verify that pump is operating
• Verify for closed valves or obstructions in boiler piping
• Verify that all air has been purged from the system
• Verify that wiring is correct
Water Pressure
Switch
• Pressure Switch contacts are open
• Alert: 63, 275-281, 460
• LCI OFF
• Verify that minimum water pressure exceeds 30 PSI
• Verify that pump is operating
• Verify for closed valves or obstructions in boiler piping
• Verify that all air has been purged from the system
• Verify that wiring is correct
Flame Failure
• The boiler has failed to ignite the
burner
• Alert: 110, 291-294
• To reset the module refer to section 5.8.2
• Verify that all air has been purged from gas line
• Inspect hot surface igniter and related wiring for damage
and connection errors
• DR 300 – 2500: Verify igniter is glowing
• DR 3000 – 5000: Verify pilot is lit
• Inspect flame sensor and associated wiring. Replace if
necessary
• Verify that boiler is properly grounded
• Verify incoming gas supply pressure and that it coincides
with Table 7.
• Verify that the vent/ air inlet piping (if equipped) are
correctly installed and obstructions are not present.
• Verify 24 VAC (DR 300 – 1200) and 115VAC (DR 1400 –
5000) is being supplied to the gas valve relay from the
Dynaforce® Controller during ignition. Check wiring from
Dynaforce® Controller and Gas Valve Relay. If a signal
cannot be detected, the Dynaforce® Controller needs to be
replaced
• If 24 VAC is present, check the outlet of the valve to ensure
that gas is flowing. When the valve is energized a change
in pressure should occur, if no change is detected the gas
valve has failed to open or it is passing insufficient amount
of gas. If this is an initial startup increase the low fire gas
setting by ¼ turn clockwise.
• Inspect the burner. Refer to Burner Maintenance in section
10.5
• Replace the Dynaforce® Controller, if necessary