1. Preventive Maintenance Checks and Services, Routine maintenance ensures trouble-free operation. Checks
and services outlined below should be performed on a daily basis and before and after each use.
Check condenser bath is clean and clear of
Wash bath with mild soap or detergent.
Check immersion heater is clean.
Check operation of heater shelf mechanism by
If shelf falls when pinion knob is
engaging pinion knob and turning knob to
elevate the shelf. Release knob and the
shelf. Release knob and the shelf should
see paragraph 2.1.
Before performing maintenance on this equipment, ensure that it is electrically
disconnected. Failure to comply with this warning could result in serious injury or death.
Maintenance - Repair and Remove/Replace Procedures.
Condenser Bath - No maintenance or repair is required for this portion of the apparatus with the exception of an
occasional cleaning with a mild soap or detergent.
Heater Shield - The components of this unit are easily accessible and replaceable.
When the heater shelf will not remain in the elevated position, it is usually caused by the groove pin which engages
the gear teeth of the pinion to lock the elevating mechanism. If this pin has slipped out of position, it may be
replaced by removing the transformer drip shield from the bottom of the heater shield to gain access. Using pliers,
reset the groove pin by forcing it into the bronze rack and pinion housing.
a. The Lo-Cap Heater can be easily replaced by lifting the front of the heater and disconnecting the asbestos
covered lead wire at the leader terminal. Similarly, remove the lead wire from the rear heater terminal and lift
the entire heater out of the shield.
b. Removal and replacement of the variable power transformer is accomplished by removing the shield unit
from its physical and electrical connection to the condenser and laying the shield unit on its side or top. The
transformer knob should be removed by inserting an Allen wrench into the opening at the side of this knob.
After loosening this setscrew, the knob will easily slide off the rotor extension shaft. The three flat head screws,
directly below the knob-dial on the face of the shield, should be removed at the same time supporting the
weight of the transformer. Remove the cover plate if present, at the back of the transformer, and electrically
disconnect it making certain that the wires are tagged.
c. The brush of the transformer is easily replaceable by unscrewing the two screws that hold it in place.
d. The line switch, installed on each heater shield, is of a type having spring steel clips at the sides of the
switch body. This type of switch is easily removable by compressing the spring clips and pushing the unit
outward. Wires are then easily removed. To install, the unit is simply pushed into the square opening in the