Harsco Industrial SC-2000, Инструкция по установке и эксплуатации

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Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
Gas Fired Boiler
5.5 Troubleshooting
The NURO control will display graphical and/or text based error descriptions to announce any problems with
the boiler. There are two types of lockouts: manual reset lockouts which require the operator to physically
press the on-screen or device’s reset button, and automatic reset lockouts which will self reset when the error
condition clears. For a comprehensive list of errors and potential resolutions, please refer to the NURO Advanced
User’s Guide.
Should the unit fail to operate, call a qualified service technician to troubleshoot the problem and implement
corrective actions.
5.5.1 Loss of Power
In the event of a power failure, the NURO touch screen will go dark and the entire boiler will de-energize.
The signal relays used to command auxiliary devices connected to the boiler (air dampers, pumps, etc.) will
also lose power, so these devices will deactivate. When power is restored, the sequence of operation will
resume at
Step 3 ( Section 5.4 ) . If any error/lockout errors were present at the time of the power failure, the
NURO control will retain that error/lockout when power is restored.
5.5.2 Loss of Water Level
The low water switch opens when there is an insufficient water level in the boiler. The NURO control will
display 10010:
“Low Water Limit” , close the gas valve, and lock the boiler out. When the water level is
corrected and the on-screen reset button is pressed, the boiler will reset and resume the sequence of
operation at
Step 3 ( Section 5.4 )
5.5.3 Low Gas Pressure
The low gas pressure switch opens when there is (or has been) insufficient gas pressure available for proper
operation of the boiler. If an external gas-supply shut-off valve is closed for any reason, a low gas condition
will result. The NURO control will display 10012:
“Low Gas Limit” , close the gas valve, and lock the boiler
out. When proper gas pressure is restored, and the on-screen reset button is pressed, the boiler will reset
and resume the sequence of operation at
Step 3 ( Section 5.4 ).
5.5.4 High Gas Pressure
The high gas pressure switch opens when there is (or has been) excessive gas pressure for the proper
operation of the boiler. The NURO control will display 10011:
“High Gas Limit” , close the gas valve, and
lock the boiler out. When proper gas pressure is restored, and the on-screen reset button is pressed, the
boiler will reset and resume the sequence of operation at
Step 3 ( Section 5.4 ).
5.5.5 High Water Temperature
When the boiler water has exceeded both the operating temperature limit and the manual reset high-
temperature limit, the NURO control will display 10009:
“High Temperature Limit” , close the gas valve, and
lock the boiler out. When the water temperature falls below the high-limit temperature setting, the boiler will
remain locked out until the water high-temperature limit switch is manually reset and the on-screen reset
button is pressed. Once reset, the control will resume the sequence of operation at
Step 3 ( Section 5.4 )
5.5.6 Low Air
If the NURO control displays either 65: “Interrupted Airflow Switch OFF” or 66: “Interrupted Airflow
Switch ON”
,
this indicates improper airflow through the boiler. First, verify proper standby blower operation –
when the boiler is in “Standby”, the blower should also be in standby.
Next, check for obstructions of the combustion air intake and/or exhaust (flue) piping. Next, check the hoses
leading to the air switches are not kinked or obstructed. An error related to the air switch does not
necessarily mean that the air switch is defective.
When 66: “Interrupted Airflow Switch ON” is displayed, check that the air switch is open when the blower
is offline. Ensure there is no air flow through the boiler when the blower is offline. An excessive negative
draft in the flue piping can cause air flow through the offline boiler which may be strong enough to maintain
closure of the air switch.