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.
MODULATING ENERGY
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.
MODULATING WATER
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.