EMERSON Pressure Controls PS4 Instruction Manual

Table of Contents

EMERSON Pressure Controls PS4

General information

The Pressure Controls PS4-…ATEX are intended to monitor the pressure and to act as a safety device.

The listed products are electrical operated switches with ignition source and are in compliance with EN 60079 / directive 2014/34/EU therefore rated / marked as:

PS4-…ATEX must be installed in an appropriate housing to protect them from mechanical damage or shock

Safety instructions

Read operating instructions thoroughly. Failure to comply can result in device failure, system damage or personal injury.
According to EN 13313 it is intended for use by persons having the appropriate knowledge and skill.
Flammable refrigerants require special handling and care due to its flammability. Sufficient ventilation is required during service of the system. Contact with rapidly expanding gases can cause frostbite and eye damage. Proper protective equipment (gloves, eye protection, etc.) has to be used.
In a severely contaminated system, avoid breathing acid vapors and avoid contact with skin from contaminated refrigerant / lubricants.Failure to do so could result in injury.
Ensure that the system is correctly labeled with applied refrigerant type and a warning for explosion risk.
Make sure that the high pressure switch is installed on high pressure side and low pressure switch on low pressure side of system. Failure to do will result in system without protection against high and low pressure and consequently risk of explosion and human injury.
Do not release any refrigerant into the atmosphere!
Do not exceed the specified maximum ratings for pressure, temperature, voltage and current.
Before opening any system make sure pressure in system is brought to and remains at atmospheric pressure.
Ensure that the system piping is grounded.
Before installation or service disconnect voltage from system and device.
Observe and avoid mechanical damage of housing in order to maintain protection class.
Ensure that design, installation and operation are according European ATEX Directive, as well as the according national standards / regulations are respected.

Installation (Fig. 1 )

PS4-…ATEX pressure controls should not be exposed to gas pulsations. When pulsations can be expected, use a pulsation damper or a capillary tube connection (min. 1m).
Mounting directions per Fig. 1 in order to prevent the collection of contaminant in pressure sensing element.

Brazing (Fig. 2 )

Perform and consider the brazing joint as per EN 14324.
Before and after brazing clean tubing and brazing joints.
Minimize vibrations in the piping lines by appropriate solutions.

Pressure test

After completion of installation, a pressure test must be carried out according to EN 378 for systems which must comply with European pressure equipment directive 2014/68/EU.
The max. system test pressure shall be 30 bar for low pressure side and 41 bar for high pressure side.

Warning:

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

Tightness test

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

Electrical connection

Entire electrical connections have to comply with local regulations.
Ensure that the cables are mounted without tension; always leave the cable a bit loose.
Ensure that cables are not mounted near sharp edges.
Do not bend or mechanically stress the cable outlet, maintain a clearance of 20 mm to neighboring parts.