Crown Boiler PHNTM399, Инструкция по установке и эксплуатации

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107
XII. Troubleshooting
(continued)
G. Troubleshooting problems where a Hard Lockout Code is displayed.
When a hard lockout occurs, the
boiler will shut down, the display will turn red and the “Help” button will “blink”. Select the “blinking” “Help” button to
determine the cause of the Hard Lockout. Once the condition that caused the lockout is corrected, the boiler will need to be
manually reset using the Reset button on the “Active Fault” display or located on the R7910 Control.
Lockout Number Condition Possible Cause
4
Supply high limit
R7910 supply sensor detected
temperatures in excess of 210°F.
• Heating load at time of error was far below the minimum firing
rate of the boiler.
• Defective system circulator or no flow in primary loop.
• Defective boiler circulator, no flow or insufficient flow in boiler loop,
or defective flow switch.
• Control system miswired so that the boiler operation is
permitted when no zones are calling.
5
DHW high limit
R7910 DHW sensor detected
temperatures in excess of Setpoint.
• DHW load at time of error was far below the minimum firing
rate of the boiler.
• Control system miswired so that boiler operation is permitted
when no DHW are calling.
6
Stack High limit
R7910 Flue gas (Stack) sensor detected
temperatures in excess of 204°F (95.6°C).
• Heat exchanger needs to be cleaned.
• Boiler over-fired.
• Air-fuel mixture out of adjustment - consult factory.
12
Flame detected out of sequence
A flame signal was present when there
should be no flame.
• Defective gas valve - make sure inlet pressure is below
maximum on rating plate before replacing valve.
18
Light off rate proving failed
Blower is not running at Light-off rate
when it should or blower speed signal not
being detected by R7910.
• Loose connection in 120 VAC blower wiring.
• Loose or miswired blower speed harness.
• Defective blower
19
Purge rate proving failed
Blower is not running at Purge rate when
it should or blower speed signal not being
detected by R7910.
• Loose connection in 120 VAC blower wiring.
• Loose or miswired blower speed harness.
• Defective blower
20
Invalid Safety Parameters
Unacceptable R7910 control Safety
related parameter detected.
Safety Parameter verification required. Contact factory.
21
Invalid Modulation Parameter
Unacceptable R7910 control Modulation
related parameter detected.
Reset the control.
22
Safety data verification needed
Safety related parameter change has
been detected and a verification has not
been completed.
Safety related R7910 control parameter has been changed and
verification has not been performed.
23
24VAC voltage low/high
R7910 control 24Vac control power is high
or low.
• Loose connection in 24Vac VAC power wiring.
• Loose or miswired 24Vac harness.
• Miswired wiring harness causing power supply short to
ground.
• Defective transformer.
• Transformer frequency, voltage and VA do not meet
specifications.
24
Fuel Valve Error
Power detected at fuel valve output when
fuel valve should be off.
• Loose or defective gas valve harness. Check electrical
connections.
• Defective gas valve (check for 24 Vac at harness during trial
for ignition before replacing valve).
25
Hardware Fault
Internal control failure. • Reset the control. If problem reoccurs, replace the R7910.
26
Internal Fault
Internal control failure. • Reset the control. If problem reoccurs, replace the R7910.
27
Ignition failure
Model PHNTM500:
Flame failure after 1 try to restart.
• No gas pressure.
• Gas pressure under minimum value shown on rating plate.
• Gas line not completely purged of air.
• Defective Electrode.
• Loose burner ground connection.
• Defective Ignition Cable.
• Defective gas valve (check for 24 Vac at harness during trial
for ignition before replacing valve).
• Air-fuel mixture out of adjustment - consult factory.
Hard Lockout Codes Displayed