Sentronic Oil Pressure Safety Control - Vogt TUBE-ICE 03TB Service Manual

9-8
SERVICE OPERATIONS
Sentronic Oil Pressure Safety Control. All Sentronics utilize a pressure sensor and an electronic
control module to precisely measure oil pump differential pressure.
Sentronic is the elimination of the traditional capillary tubes, bellows, and pressure connections that
mechanical pressure switches require to measure differential oil pressure. These require careful
handling and are known to be a source of leaks in refrigeration systems.
A second advantage of Sentronic is in the use of a precise electronic clock for the two minute time
out circuit. Traditional mechanical controls use resistance heaters to provide the time to trip in the
event of low oil pressure. 208 volt systems, low ambient temperatures or brown-out type conditions
cause the heater output to be reduced, thus increasing the time out period from two minutes to three
or four minutes when low oil pressure conditions exist. With the electronic clock, the time out will
always be the same.
As a result of the elimination of the capillary tube measuring system and a more precise timing
circuit, Sentronic will improve the overall reliability of the refrigeration system. As in the past, all
new and replacement Copelametic compressors equipped with oil pumps require the use of a
Copeland approved oil pressure safety switch. Failure to use an approved oil pressure safety switch
will be considered as misuse of the compressor, and can adversely affect warranty replacement of
the compressor should a lubrication connected failure occur.
Oil Pump
Copper
Washer
Sentronic/CoreSense Oil Safety (Sensor Only)
4/11/14
Sensor
Module
Part #: 12A2117A0501

Sentronic Oil Pressure Safety Control

Sentronic Oil Safety Control (Entire Unit)
FIGURE 9-9A
03TA Service Manual
The main advantage of
Oil Sightglass (50hz machine)
Note: Sightglass on other side
of compressor for 60hz
machines
Reset Button
Part #: 12A2117A05