Heatcraft Refrigeration Products H-IM-72A User Manual download pdf (Page 25)

Series P100 Pressure

Control

The P100 series, manufactured by Johnson Control, Inc., are

encapsulated, non adjustable, single-pole single throw, direct

mount pressure controls typically used for low or high

pressure cutouts. On the Heatcraft manufactured parallel

systems, the control is used for High Pressure cutout.

There are two types available. Auto Reset Models and

Manual Reset Models.

Figure 13.

Auto Reset Models

When pressurized to the selected actuation pressure setting,

the internal snap-acting disc reverses its shape and drives a

set of electrical contacts either open or closed. When the

pressure drops below the de-actuation pressure setting, the

disc snaps back to its preset position thus resetting the

electrical contacts.

Manual Reset Models

The snap-acting disc in the manual reset model opens the

electrical contacts when actuated by the pressure sensor.

Once the disc snaps, the contacts are held open until an

external force on the push button closes them. Because of

the disc’s link with the pressure sensor, the contacts cannot

be reset until the pressure drops to a predetermined level.

The latching mechanism inside the manual reset model is trip

free. The electrical contacts will cutout even if the reset

button is held fully depressed. The control can only be reset

when the pressure returns to a predetermined level.

Liquid Level Switch

S-9400 Level Switch Series

OPTION – Not available on all systems or receivers.

Figure 14.

Table19. Level Switch Table

CAT VOLTAGE RESISTIVE CONTACTS

NO. RATING LIQ. PRESENT

S-9420 208/240

50/60 Hz .5 Amp N.C.

CAT

REPLACEMENT REPLACEMENT

NO. WIRE COLOR MODULE NO. SIGHT GLASS

CODE NO.

S-9420 RED & WHITE 2-044-015 3-020-063

Operation

The S-9400 Series Level Switches manufactured by

A C & R

COMPONENTS

uses light reflecting from a conical glass prism as

a means of detecting the absence of a fluid at the level of the

glass cone. When no fluid covers the lower half of the cone,

infra-red light from the module reflects from the mirror-like

inner surface of the cone back to a light detector signaling the

electronic module to switch. When fluid covers the lower half

of the glass cone, the light from the module passes into the

fluid. This absence of light is detected by the module which

switches into the opposite direction. The module provides a

.06/.10 differential distance from the cone point down.

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Heatcraft Refrigeration Products H-IM-72A User Manual Page 25

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