Camus Hydronics DRH300, Installation, Operation And Service Manual

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51
SYMPTOM FAILURE MODE ANALYSIS
Manual Reset High
Limit Trips (if
equipped)
• Manual Reset Safety High Limit
tripped, outlet temperature in
excess of 210
o
F
• Alert: 63, 67, 79, 137, 276-281,
303-309
• ILK OFF
• Verify that the capillary tube is broken. If this is the case,
replace Manual Reset High Limit
• Verify that the system is full of water and that all air has
been properly purged from the system.
• Verify that the boiler is piped properly.
• Verify that 120 VAC is being supplied to the boiler pump on
a call for heat. If voltage cannot be detected check wiring.
• Verify that the pump is circulating when 120 VAC is
supplied. If so, pump impeller may be stuck. Use a flat
head screwdriver on face of pump to turn impeller
manually.
• If 120 VAC is present during a call for heat, but the pump
still does not circulate, replace pump.
Delta-T Limit
Tripped
• Outlet temperature has exceeded
40
o
F over inlet temperature
• Alert: 124
Verify that the system is full of water and that all air has been
properly purged from the system.
• Verify that the boiler is piped properly.
• Verify that 120VAC is being supplied to the boiler pump on
a call for heat. If voltage cannot be detected check wiring.
• Verify that the pump is circulating when 120VAC is
detected. If not, pump impeller may be stuck. Use a flat
head screwdriver on face of pump to turn impeller manually
• If 120VAC is present during a call for heat, but the pump still
does not circulate, replace the pump.
• Purge all air from the piping
• Verify boiler water pressure exceeds 30 PSI
Temperature
Overshoot
• Stack temperature has exceeded
the limit temperature.
• Alert: 125
• The stack temperature has exceeded the maximum
temperature allowed.
• PVC: 149
o
F
• CPVC: 194
o
F
• AL29-4C, Stainless Steel: 250
o
F
• Measure the resistance of the flue sensor at room
temperature, it should be approximately 10k Ω .
• Outlet temperature has exceeded
limit temperature.
• Alert: 63, 67, 79, 137, 276-281,
303-309
• LCI OFF
• Verify that the system is full of water and that all air has
been properly purged from the system
• Verify that the boiler is piped properly.
• Verify that adequate power is supplied to pump on a call for
heat. If voltage cannot be detected check wiring
• Verify pump is circulating when power is supplied. If so,
pump impeller may be stuck.
• If power is present during a call for heat, but the pump still
does not circulate, replace the pump.
• Replace the Dynaforce® Controller, if necessary.
Sensor Not
Connected
• Inlet sensor, Alert: 91
• Outlet sensor, Alert: 92
• DHW sensor, Alert: 93
• Stack sensor, Alert: 95
• Outdoor sensor, Alert: 96 • Verify sensors are connected
• Verify wiring.
• Measure resistance of sensors, 10k
Ω sensors.
• Replace sensor if necessary
Fan Not Turning
• Fan refuses to rotate
• Alert 122, 123, 128, 129, 130, 131,
132 • Check fan power wires
• Fan signal wires are interchanged
• Minimum fan speed must be greater than 1600 RPM
Air Proving Switch
• Interrupted Air Switch error
• Alert: 67, 137, 303-310
• ILK OFF
• IAS OFF
• Air Switch wire(s) is/are loose
• Air Switch is set too tight, reduce sensitivity by turning
screw ¼ turn counter-clockwise.
Blocked Flue
Switch
• LCI error
• Alert: 63, 137, 276-281
• LCI OFF • Blocked Flue Switch wire(s) is/are loose
• Blocked Flue Switch is set too tight, reduce sensitivity by
turning screw ¼ turn clockwise.