J52 Datasheet, PDF (2/8 Pages) Magnetrol International, Inc. – J52 Refrigerant Level Switches

INSTALLATION
PIPING
Figure 3 shows a typical piping schematic of Magnetrol J52
level switches installed on a liquid accumulator. Appropriate
reference mark on control float chamber should be aligned
to correspond with liquid level at which switch control is
desired (switch operates at upper mark on increasing level
and lower mark at decreasing level).
Use pipe of sufficient strength to support the control. All
piping should be straight and free of “low spots” or “pock-
ets” so that the lower liquid line will drain towards the liquid
accumulator (or receiver), and upper vapor line will drain
toward the control. Shut-off valves are recommended for
installation between accumulator (or receiver), and control
float chamber.
If control is to be used with a low temperature liquid (one
which will “boil” in float chamber if outside heat is
absorbed), the chamber and piping should be insulated.
Such boiling in the chamber will cause false level indica-
tions. Do NOT insulate switch mechanism housing.
MOUNTING
Adjust piping as required to bring control to a vertical posi-
tion. Magnetrol controls must be mounted within three (3°)
degrees of the vertical. A three-degree slant is noticeable by
eye, but installation should be checked with a spirit level on
top or sides of float chamber.
WIRING
CAUTION: Level controls are shipped from the factory with
the enclosing tube tightened and the middle set screw, on
the housing base, locked to the enclosing tube. Failure to
loosen the set screw prior to repositioning the conduit con-
nection may cause the enclosing tube to loosen, resulting
in the possible leakage of the process liquid or vapor.
The standard Model J52 with NEMA 4 housing is furnished
with 24" (610 mm) long lead wires for ease in connection at
a close junction box. Wires are sealed in a conduit outlet
adaptor fitting, color coded and numbered to allow control
wiring without the need to remove the sealed housing
cover. All switch electrical ratings are stamped on the hous-
ing cover nameplate. If desired, conduit outlet may be repo-
sitioned for wiring convenience by loosening set screw(s)
located under the housing base; however, housing cover
must be removed and switch mechanism locking screw
loosened so that mechanism can be rotated together with
housing base.
NOTE: Before placing control into service, be certain cover
gasketed joints are tight to prevent infiltration of moisture
laden air or corrosive gases to the switch mechanism.
Line
Coil
Pump
Motor
TYPICAL INSTALLATIONS AND WIRING DIAGRAMS
INSTALLATION SHOWING PUMP CONTROL AND HIGH LEVEL ALARM
MODEL J52 MAGNETROL CONTROLS
Alarm
High Level Alarm
terminals
4
5
6
Chamber mark indicates
actuating levels
Pump On
terminals
4
5
6
SUCTION TO
COMPRESSOR
High Level Alarm
Pump On
SUCTION FROM
COOLERS
Pump Off
terminals
4
5
6
Line Starter with
3-wire pilot circuit
LIQUID
ACCUMULATOR
Pump Off
TO PUMP
Figure 3
2