SAFETY VAPOR CONTROL
If there is inadequate flow, warm water, or refrigeration entering the primary condensing coils, the solvent vapor can rise and overflow the degreaser. A thermocouple or sensing bulb is located directly above the primary coils. Solvent vapor reaching the sensor will cause the heat input to the boiling sump to shut off. In most cases, the poor coolant conditions must be rectified before the degreaser can be restarted. The manual reset button on the control must be depressed.
LIQUID HIGH TEMPERATURE
When the boiling solvent becomes contaminated with an excess of oil from the degreasing operation, the temperature of the mixture will rise eventually to a point where degreasing efficiency is impaired. A thermocouple or sensing bulb in the boiling liquid will cause the heat input to shut off at the preset temperature. A digital readout (optional) will allow maintenance to monitor the status of the solvent and schedule solvent replacement.
LOW LIQUID LEVEL
It is dangerous and undesirable for the solvent level to be so depleted that the heating coils are exposed to the solvent vapor. The low liquid level is a float-type control which will shut off the heat. Restart is automatic, after the solvent level is replenished.
WATER FLOW HEAT SHUT-OFF
If in the event the water flow in the primary condensing system is inadequate, the heat input to the degreaser or still is turned off. Restarting is automatic, when the water flow is resumed.
WATER HIGH TEMPERATURE/HEAT SHUT OFF
If the water temperature being discharged from the degreaser exceeds the designed set point, the heat control is automatically turned off. Restarting is automatic when the water temperature drops below the design set point.
LOW VAPOR LEVEL/SPRAY SHUT-OFF
If an excessive work load is introduced into the degreaser and the vapor line drops, either manual or automatic spray systems will not operate until the vapor line recovers to the normal operating level.
When the unit is idling, this control will cut off approximately 40 percent of the heat input. When work is introduced into the degreaser, the vapor level drops, below the sensing bulb and the control will automatically increase the heat input.
A temperature sensing bulb placed on the discharge of the water line from the primary coil will modulate the water flow to a proper discharge temperature for the solvent being used. This will help to reduce water use.