EMERSON Pressure Controls Series CS1 Instruction Manual

Table of Contents

EMERSON Pressure Controls Series CS1Instruction Manual

General information:

For application in refrigeration systems in compliance with standard 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 it is intended for use by persons having the appropriate knowledge and skill.
Before opening any system make sure pressure in system is brought to and remains at atmospheric pressure.
Before installation or service disconnect all voltages from system and device.
Do not exceed the specified maximum ratings for pressure, temperature, voltage and current.

Function:

CS1 Pressure switches are equipped with SPDT snap action contacts switching from 1-2 to 1-4 on rising and from 1-4 to 1-2 on falling pressure. Reaching the preset switch point on rising pressure, contact 1-2 opens while contact 1-4 closes and vice versa on falling pressure.

Mounting direction:

• Any direction except upside down.

Installation (Fig.2&4):

CS1 may be installed by using a mounting plate or as a wall-mounted device against a flat surface.
Use universal thread M4 or UNC8-32 mounting holes for installation via mounting plate.
Use the standard mounting holes at the backside for wall mounting.
Use mounting screws supplied with control.
Mounting screws must not penetrate control backside by more than 8 mm to ensure proper operation.
Do not use CS1 in pulsating operating conditions! Minimize vibrations in the piping lines by appropriate solutions.
In order to achieve protection class IP33, the following instructions must be observed:1. Cover must be closed and cover screw fastened.2. Control must be mounted against a flat surface so that all openings on the housing backside are fully covered.3. Cable grommet (Fig.4, No.5) is sealing the cable entry to the housing

Pressure connection (Fig.3):

Do not apply torsional load to pressure connector; use second spanner to counter-balance torque when tightening pressure connection. High pressure versions are equipped with a snubber to dampen pulsations.
When connecting CS1 to the hot gas line of a refrigeration system, a pipe or high-pressure hose of at least 80 mm shall be used to allow sufficient temperature drop between refrigeration line and pressure switch bellows.

Pressure test:

After completion of installation, a test pressure must be carried out as follows:

according to EN378 for systems which must comply with European pressure equipment directive 2014/68/EU
to maximum working pressure of system for regions out of Europe

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 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:

Entire electrical connections have to comply with local regulations.
Wire size must match the electrical load connected to the switch contacts.
Feed cables through rubber grommet at switch bottom (Fig.4, No.5).
Optionally, the rubber grommet may be replaced by a standard PG 13.5 cable gland.
Connect wires to terminals (Fig.4, No.3) by taking into account switch functions as shown in Fig.1
Fasten terminal screws with torque 1.2 Nm max.
Warning: CS1 might not be suitable for connection to electronic controllers with low electrical loads (voltage <24 V and current <50 mA).

Setpoint adjustment (Fig.4&5):

CS1 pressure switches come with individually adjustable range and differential depending on the exact model.
Use a flat screw driver or a ¼” refrigeration (square) wrench to adjust setpoints as described below.
Adjust upper setpoint using the range spindle (Fig.4, No.1).
Adjust lower setpoint by turning the differential spindle (Fig.4, No.2).

Upper setpoint – Differential = Lower setpoint Fig.5a/5b

(1) Upper setpoint(5) Upper setpoint(2) Lower setpoint(6) Lower setpoint(3) Differential(7) Differential = variable(8) Turning range spindle(9) Turning differential spindle

A separate accurate gauge must be used for exact adjustment of the setpoints. The integrated display scale can only be used for obtaining approximate settings. Maximum cut-out level must be as follows:1. System with single protection device: At PS of system minus tolerances.2. System with two individual protection devices: At 0.9*PS of system.
When changing the upper setpoint the lower setpoint must be re-checked.
Refer to the Technical Bulletin for standard factory settings.

Check-out lever (Fig.4, No.4):

Use the check-out lever to manually override the electrical contact position for testing out the system.Service / Maintenance:
Defective CS1 must be replaced, they cannot be repaired.