Emerson Fluid Chiller Anleitung zur Fehlerbehebung PDF herunterladen (Seite 54)

Emerson Climate TechnologiesEmerson Climate TechnologiesTemperature-Pressure Controls

Emerson Climate Technologies

For operational safety, all TS1 with manual reset are

designed as trip-free controls, i.e. pressing the manual

reset button while the temperature has not reached its

reset threshold will not operate the electrical contacts.

Bellows Heater

TS1 with vapor charges, i.e. sensor types A, E, P

(not frost monitors function C or D) have a bellows

heater wired across the contacts in the following way.

Bellows heater

PS1/PS2 Introduction

The PS1/PS2 Series is Emerson’s adjustable pres-

sostats for application in refrigeration and heat pump

systems.

In these systems, pressure controls serve control

and protection functions. Examples of control are

compressor cycling, pump-down or defrost control.

Protection includes pressure limiting and cut out against

excessive pressures, against loss of charge or for freeze

protection.

Pressure Sensing

All pressures mentioned in this document are un-

derstood as gauge pressures. PS1/PS2 controls sense

pressure by bellows which expand or contract when

exposed to medium pressure.

High pressure limiters and pressure cut outs with

type approval according to EN 12263 feature a double

bellows design. The inner bellows serves as the operat-

ing bellows and is enclosed by the outer bellows featur-

ing a larger surface area.

Single Pressostat PS1

Dual Pressostat PS2

Should the inner bellows leak, then the larger sur-

face area of the outer bellows creates a larger force

and causes the pressostat to a pre-empted cut out. This

represents a fail-safe function. Standard controls for

refrigeration applications are equipped with a bronze

bellows and can be used with all common HFC, HCFC

and CFC refrigerants.

Pressure Connectors

A variety of pressure connectors, including male

and female are type connectors, capillary and solder

connectors are available. The standard connector is a

7-16”-20 UNF male are connector, which, in its high

pressure versions, is equipped with a snubber to protect

against pressure pulsations.

Electrical Contacts

PS1/PS2 pressure controls are equipped with high

rated double snap action contacts for shatter-free and

reliable operation.

All contacts in these controls are designed as Single

Pole Double Throw (SPDT) contacts. One contact may

be used for control and the other contact for alarm/sta-

tus indication or auxiliary control. Dual Pressostats PS2

come with two independently actuated SPDT contacts,

providing for even further application exibility by allow-

ing for a variety of wiring options.

Ω

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