Frascold DELTA-P - User Manual

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M159-02 1

Pressostato differenziale olio DELTA-P

DELTA-P oil differential pressure switch

FRASCOLD SpA

Via Barbara Melzi 105

I - 20027 Rescaldina (MI)

Tel. +39-0331-7422.01

Fax +39-0331-576102

http://www.frascold.it

e-mail: frascold@frascold.it

1. Descrizione

Il pressostato differenziale DELTA-P per il controllo della lubrificazione fornito con

la dotazione standard per tutti i compressori serie V, Z e W è essenzialmente

composto da (vedi fig.1):

 circuito di controllo; completo di ghiera di fissaggio, pulsante di reinserzione,

LED di segnalazione, cavi di collegamento.

Questo componente è fisicamente alloggianto all’interno della scatola

terminali del compressore con il foglio di istruzioni per l’uso.

 sensore; con attacco maschio M20 x 1.5 fissato, in fabbrica, all’attacco

filettato del compressore (vedi fig.2)

Il suo montaggio è semplice e rapido, non richiede l’uso di staffetta di fissaggio

e, in caso di interventi di manutenzione, la rimozione del circuito di controllo dal

sensore non comporta fuoriuscite di refrigerante.

2. Dati tecnici

Pressione differenziale di arresto: 0.65 bar

Tempo di ritardo: 90 secondi

Reinserzione: manuale

Tensione di alimentazione: 230 V, 50-60 Hz

Tipo dei contatti: interruttori

Massima portata dei contatti (250V): 300 VA ind.

Temperatura ambiente di funzionamento: -30°C ÷ +60°C

Grado di protezione: IP54

Lunghezza del cavo di collegamento, 4 x AWG20, codice a colori: 1 m

Peso: 200 g

3. Istruzioni per il montaggio

Per il completo montaggio del pressostato DELTA-P a partire con il compressore

in configurazione standard (vedi “1.Descrizione”), procedere come segue:

a) prelevare il circuito di controllo del pressostato (vedi figura 1,

riferimento ) dalla scatola elettrica del compressore

b) inserire il circuito di controllo nel sensore  e serrare a mano la ghiera girevole

c) collegare elettricamente il pressostato differenziale, seguendo lo schema

elettrico illustrato a pagina 2.

segue a pagina 2

attacco per il sensore

del pressostato DELTA-P

DELTA-P pressure

switch connection

- fig. 1 -

1. Description

DELTA-P oil pressure switch is suitable for lubrication pressure control and is supplied

as standard equipment with V, Z and W semi-hermetic compressors; it includes

(see fig.1):



control circuit; complete with fixing screw cap, reset push-button, LED signal

lamp, cables.

This component is located in to the terminal box of the compressor with

instruction leaflet.



sensor; M20 x 1.5 male threaded, mounted in factory to the pressure

connection of the compressor (see fig.2)

DELTA-P mounting is easy and fast; no mounting bracket is required and, for

maintenance operations, control circuit can be removed from the sensor

without refrigerant leakage.

2. Technical data

Cut-out set point: 0.65 bar

Delay: 90 seconds

Reset: manual

Supply: 230 V, 50-60 Hz

Type of contact: single pole, single throw

Maximum switch capacity: 300 VA ind.

Operating ambient temperature: -30

+60

Safety class: IP54

Length of connecting cable, 4 x AWG20, colour coded: 1 m

Weight: 200 g

3. Mounting instructions

For DELTA-P pressure switch mounting on the compressor with factory

configuration, proceed as follows:

a) take the control circuit off the electric box of the compressor (see fig.1,

reference



)

b) put the control circuit into the sensor and close tightly by hand the screwcap

c) connect the pressure switch in accordance with the wiring diagram

shown at page 2.

continued on page 2



- fig. 2 -

M20 x 1.5

ghiera girevole

di fissaggio

fixing screwcap

LED rosso

red LED

componente girevole

di collegamento 360°

electrical part

swivel 360

107.5

28.5

pulsante di reinserzione

reset push-button

pompa di lubrificazione

con pressostato DELTA-P

oil pump with DELTA-P

pressure switch

Need help?

Do you have a question about the Frascold DELTA-P and is the answer not in the manual?

The DELTA-P oil differential pressure switch is designed for lubrication pressure control in Frascold V, Z, and W semi-hermetic compressors. It is supplied as standard equipment with these compressors.

Function Description

The DELTA-P pressure switch continuously monitors the differential pressure in the compressor's lubrication system. When the compressor starts, the red LED illuminates, indicating an insufficient pressure differential between the suction and discharge of the oil pump. Simultaneously, the output contacts of the pressure switch close, and a time delay begins. If the minimum required pressure differential is achieved within the programmed delay time, the red LED switches off, and the output contacts remain closed, allowing the compressor to operate normally. The time delay is then reset.

However, if the minimum pressure differential is not reached within the specified delay time, the output contacts open, causing the compressor to stop, and the red LED remains illuminated. Once the cause of the compressor shutdown is resolved, the operator can restart the compressor by pressing the reset push-button, provided that at least 90 seconds have passed since the shutdown.

The DELTA-P pressure switch also acts as a safety mechanism if the pressure differential intermittently drops below the set point for periods shorter than the programmed delay. Specifically, the compressor will stop within 425 seconds if the cumulative time of insufficient pressure differential reaches 50% of the total monitoring time. Similarly, it will stop within 760 seconds if the cumulative time of insufficient pressure differential reaches 40% of the total monitoring time. This ensures continuous protection against lubrication issues.

Important Technical Specifications

Cut-out Set Point: 0.65 bar
Delay: 90 seconds
Reset: Manual
Supply Voltage: 230 V, 50-60 Hz
Type of Contact: Single pole, single throw
Maximum Switch Capacity: 300 VA inductive
Operating Ambient Temperature: -30°C to +60°C
Safety Class: IP54
Length of Connecting Cable: 1 m (4 x AWG20, color-coded)
Weight: 200 g

Usage Features

The DELTA-P pressure switch consists of two main parts: a control circuit and a sensor. The control circuit includes a fixing screw cap, a reset push-button, an LED signal lamp, and connecting cables. This component is housed within the compressor's terminal box. The sensor features an M20 x 1.5 male thread and is factory-mounted to the compressor's threaded pressure connection.

Installation is designed to be straightforward and quick, requiring no additional mounting brackets. For compressors already equipped with the necessary connection point but without the DELTA-P switch, the installation process involves:

Identifying the sensor connection point on the compressor body.
Ensuring the internal pressure of the compressor is at zero gauge before removing the plug from the sensor connection.
Screwing the sensor onto the connection with a maximum tightening torque of 34 Nm.
Inserting the control circuit into the sensor and hand-tightening the screw cap.
Connecting the pressure switch electrically according to the provided wiring diagram.

For compressors already configured with the DELTA-P switch, the process for re-assembly or maintenance is simplified:

Remove the control circuit from the compressor's electric box.
Insert the control circuit into the sensor and hand-tighten the screw cap.
Connect the pressure switch electrically following the wiring diagram.

Maintenance Features

A key advantage of the DELTA-P design is that the control circuit can be removed from the sensor without any refrigerant leakage. This simplifies maintenance operations, as it avoids the need to evacuate the refrigerant system when servicing the electrical components of the pressure switch. The manual reset function ensures that the operator is aware of a lubrication issue and takes corrective action before restarting the compressor. The robust IP54 safety class indicates protection against dust ingress and splashing water, contributing to the device's durability and reduced maintenance needs in typical industrial environments.

Frascold DELTA-P Specifications

General

Brand	Frascold
Model	DELTA-P
Category	Switch
Language	English