EMERSON Pressure Controls Series PS4 Instruction Manual

EMERSON Pressure Controls Series PS4 Instruction Manual

General information:

For application in refrigeration systems and heat pumps according to EN 378. A professional and appropriate storage and allocation of the devices is mandatory.

Safety instructions:

• Read operating instructions thoroughly. Failure to comply can result in device failure, system damage or personal injury.
• According to EN 13313 this product is intended for use by personnel having the appropriate knowledge and skill.
• Ensure that the system is correctly labeled with applied refrigerant type and a warning for explosion risk, when used with flammable refrigerants.
• Before opening any system make sure pressure in system is brought to and remains at atmospheric pressure.
• Do not release any refrigerant into the atmosphere!
• Do not exceed the specified maximum ratings for pressure, temperature, voltage and current.
• Before installation or service disconnect all voltages from system and device.
• Observe and avoid mechanical damage of housing in order to maintain protection class.
• Do not use any other fluid without prior approval of EMERSON. Use of fluids not listed could result in: Change of hazard category of product and consequently change of conformity assessment requirement for product in accordance with European pressure equipment directive 2014/68/EU.
• Ensure that design, installation and operation are according to European and national standards/regulations.

Setting:

PS4 Pressure switches are factory preset to a specific value (see label).
Function / Type of switch : (Fig. 1,2)
Fig.1: Pressostat automatic reset (NC/NO):

Fig.2: High pressure cut-out (manual reset)

PS4 with automatic reset:
PS4 Pressure switches are equipped with snap action contacts opening or closing on falling or rising pressure. Depending on model they are equipped with single pole single through (SPST) or single pole double through contacts (SPDT).
PS4 with manual reset (HP only):
Reaching the preset switching point contacts open or close and latches. After the pressure drops by ape. 4-8 bar depending on pressure setting (high pressure switch only) the switch can be reset by pushing the reset button.

Installation:

PS4 Pressure switches should not be exposed to pulsations. Use a pulsation damper or a capillary tube connection (min.1m) when pulsations can be expected.

Mounting location: any
Pressure connection:

Threaded connection:

• Use pulsation damper and high temperature diaphragm for direct compressor mounted high pressure applications.
• Do not apply torsional force to switch housing assembly during assembly.

(1) = Copper gasket

Brazing:

• Perform the brazing as per EN 14324.
• Before and after brazing clean tubing and brazing joints.
• Do not exceed the max. body temperature of 70°C!

Pressure Test:
After completion of installation, a pressure test must be carried out as follows:
– according to EN 378 for systems which must comply with European pressure equipment directive 2014/68/EU.
– to maximum working pressure of system for other applications.

Warning:

• Failure to do so could result in loss of refrigerant and personal injury.
• The pressure test must be conducted by skilled personnel with due respect regarding the danger related to pressure.

Tightness Test:
Conduct a tightness test according to EN 378-2 with appropriate equipment and method to identify leakages of external joints. The allowable leakage rate must be according system manufacturer’s specification.

Electrical connection:

• Comply with local electrical regulations when wiring PS4. To maintain protection class, proper installation is mandatory.
• Ensure that the cables are mounted without tension; always leave the cable a bit loose.
• Ensure that cables are not mounted near sharp edges.

Operation:

• Perform a functional test of electrical circuit before charging the system with refrigerant.

Service / Maintenance:

• Disconnect electrical power before service.
• Defective PS4-… must be replaced; they cannot be repaired.
• In case of repair work or replacing the control always use new gasket Fig 3 (1).

Technical Data:

Type code: PS4 – e.g. PS4 ­ A 1

(1) Function

• A Pressure controls, automatic, high pressure or low pressure
• W Pressure limiters, automatic, type approval acc. EN 12263, (Definition term by EN12263 & EN378: PSL/PSH)
• R Pressure controls, external manual reset (by hand)
• B Pressure limiters, external manual reset (by hand); type approval, acc. EN 12263, (Definition term by EN12263 & EN378: PZH)

(2) Electrical connection

1. Normally closed silver contact with molded cable
2. Normally open silver contact with molded cable
3. Normally closed silver contact with quick connector; QC (for push-on spades)
4. Normally open silver contact with quick connector, QC (for push-on spades)
5. Normally closed gold-plated contact with molded cable
   L Normally closed silver contact with molded cable suitable for manual rest

Emerson Climate Technologies GmbH Am Borsigturm 31 I 13507 Berlin I Germany

www.climate.emerson.com/en-gb

Date: 18.05.2021

PS4_OI_EN_DE_FR_ES_IT_RU_0521_R05_865025.docx

References

• Copeland is Engineered for Sustainability | Copeland GB

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