INSTALLATION

TYPICAL INSTALLATIONS AND WIRING DIAGRAMS

Figure 3

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

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.

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.

4

High Level Alarm

terminals

Pump On

terminals

Pump Off

terminals

Line Starter with

3-wire pilot circuit

5

6

4

5

6

4

5

6

Pump

Motor

Coil

Line

Alarm

Pump Off

Pump On

Chamber mark indicates

actuating levels

High Level Alarm

SUCTION TO

COMPRESSOR

LIQUID

ACCUMULATOR

MODEL J52 MAGNETROL CONTROLS

INSTALLATION SHOWING PUMP CONTROL AND HIGH LEVEL ALARM

SUCTION FROM

COOLERS

TO PUMP

2