Lufran Water Heater

Cause

Remote Input Open Circuit

Solution

The 4-20mA input signal for the remote set-point is not present. This alarm is disabled when the unit is in LOCAL or MANUAL control modes.

Cause

Inlet Sensor Disconnected

Solution

The inlet temperature sensor has failed (open). The inlet temperature sensor must be replaced. This may also be caused by a disconnected sensor connection.

Cause

Flow Meter Sensor Disconnected

Solution

The flow meter has suffered a fault and should be replaced.

Cause

Column # Sensor Disconnected

Solution

One of the column TC sensors has failed (open). The sensor must be replaced. This may also be caused by a disconnected sensor connection.

Cause

Column Over-temp

Solution

The water temperature inside the heating column has risen above the setting of the control system. This may be caused by lack of water flow, a failed SSR or a failed thermocouple sensor. The values of these temperature settings are an internal adjustment that is not accessible by the operator. It may only be adjusted by qualified personnel. When the water temperature falls below the setting of the SLC, the unit can be reset. NOTE: Rockwell Automation Systems Only: this alarm cannot be reset through the PLC. Rather, this alarm must be reset by shutting down cycling the main circuit breaker off and then on powering up the unit. Refer to the SHUTDOWN of the Lufran manual for the procedure

Cause

Pressure Switch

Solution

The water supply pressure has dropped below the setting of 10PSI on the pressure switch. The water pressure must increase to a level above 15 PSI in order for the unit to return automatically to normal operation. If proper water is pressure is present it may be a problem with the PLC input card and or the actual pressure switch that is located the inlet plumbing. You will need to verify the proper operation of both. Consult the factory for the appropriate replacement.

Cause

PLC Battery Fault

Solution

The backup battery for the PLC is measuring low-voltage or has lost it’s charge. The battery must be replaced.

Cause

Communication Error

Solution

PLC communications to the ADAM module, TC1 module or SLC modules has been interrupted. Check modules for power or disconnected wiring.

Cause

PLC Alarm

Solution

A problem has occurred with the PLC itself, and the system is unable to operate normally. Inspect the PLC unit itself and correct any open or broken connections. Try cycling main power to clear this fault. If the PLC Fault alarm will not clear, contact PROCESS TECHNOLOGY for assistance.

Cause

Column Monitor Board Alarm

Solution

One of the SSR monitor boards has detected an open or shorted SSR. This may be caused by a failed SSR or a failed power fuse in the unit. The failed fuse or the failed SSR must be replaced before the unit can be reset. Consult the factory for the appropriate replacement.