EMERSON PS1/PS2 Series Pressure Controls Instruction Manual

: June 12, 2024
: Emerson

Table of Contents

General information:
Safety instructions:
Technical Data:
References
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PS1/PS2 Series Pressure Controls
Instruction Manual

Pressure Controls Series PS1 / PS2
OPERATING INSTRUCTIONS

General information:

For application in refrigeration systems and heat pumps.
The device has a potential ignition source and has not been qualified according to ATEX standards. Installation only in “non-explosive location”.

Safety instructions:

Read operating instructions thoroughly. Failure to comply can result in device failure, system damage or personal injury.
This product is intended for use by qualified personnel having the appropriate knowledge and skills like trained according to EN 13313 or a specific training for flammable refrigerants.
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.) must be used.
Ensure that the system is correctly labeled with applied refrigerant type and a warning for explosion risk.
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.
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.
Ensure that the system piping is grounded.
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 media 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 comply with European and national standards/regulations.
For flammable refrigerants only use valves and accessories approved for it!

Function:
Fig. 1a: automatic reset function:

PS1/PS2 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.

EMERSON PS1 PS2 Series Pressure Controls - reset
function

Fig. b: manual reset function for low pressure reset /
Fig. 1c: manual reset function for high pressure reset:

PS1/PS2 with manual reset (high pressure/low pressure reset): Reaching the preset switching point contact 1-4 switches to 1-2 (low pressure switch) or from 1-2 to 1-4 (high pressure switch) and locks in this position. After the pressure rises or drops by a fixed differential the switch can be reset by pushing the reset button.

EMERSON PS1 PS2 Series Pressure Controls - reset
function1

Mounting location :
Any direction except upside down
Installation: (Fig. 2)

PS1/PS2 controls 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 PS1/PS2 in pulsating operating conditions! To achieve protection class IP44, the following instructions must be observed:
Cover must be closed, and cover screw fastened
Control must be mounted against a flat surface so that all openings on the housing backside are fully covered

Pressure connection: (Fig. 3)

Connection of the pressure side depends on the exact model / pressure connector.
When connecting PS1/PS2 to the hot gas line of a refrigeration system, a pipe, capillary or flexible tube of at least 80 mm shall be used to allow sufficient temperature drop between refrigeration line and pressure switch bellows.

Threaded connection:

Connectors A & C: Do not apply torsional load to pressure connector; use second spanner to counterbalance torque when tightening pressure connection.
K-type connectors: use copper gasket supplied with control.

Brazing connection:

Perform 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.
Do not exceed the max. surface 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.

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

WARNING:

Failure to pressure test or tightness test as described could result in loss of refrigerant, damage to property and/or personal injury.
The tests must be conducted by skilled personnel with due respect regarding the danger related to pressure.

Electrical connection: (Fig. 4)

Range spindle
Lock plate
Differential spindle
Electrical terminals
Check-out lever
Cable entry grommet
Pressure Connection

Entire electrical connections have to comply with local regulations.
Wire size must match the electrical load connected to the switch contacts.
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.
Feed cables through rubber grommet at switch bottom.
Optionally, the rubber grommet may be replaced by a standard PG 13.5 cable gland.
Connect wires to terminals by considering switch functions as shown in Fig. 1a to Fig. 1c.
Fasten terminal screws with torque 1.2 Nm max.
For electronic applications with low electrical loads (voltage < 24 V and current <50 mA) gold plated contacts are recommended.

Setpoint adjustment: (Fig. 5)

PS1/PS2 pressure switches come with individually adjustable range and differential depending on the exact model.
Manual reset switches always have a fixed differential.
Use a flat screwdriver or a 1/4” refrigeration (square) wrench to adjust setpoints as described below.
Adjust upper setpoint using the range spindle.
Adjust lower setpoint by turning the differential spindle.

Upper setpoint – Differential = Lower setpoint

EMERSON PS1 PS2 Series Pressure Controls - Lower
setpoint

(1) Upper setpoint
(2) Lower setpoint
(3) Differential = constant
(4) Turning range spindle| (5) Upper setpoint
(6) Lower setpoint
(7) Differential = variable
(8) Turning differential spindle
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A separate gauge must be used for exact adjustment of the setpoints. The integrated display scale can only be used for obtaining approximate settings.
When changing the upper setpoint the lower setpoint must be re-checked.
Refer to the Emerson catalogue or Technical Information for standard factory settings.

Manual reset / Universal reset: (Fig. 6a-c)

Manual reset (external): press the reset button (1) as indicated by Fig. 6a.
Manual reset (internal): remove the housing cover and press the reset button (2) as indicated by Fig. 6b.
Note that the reset is ‘trip-free’, i. e. reset is only possible if the pressure has reached its reset threshold.
Universal reset: remove the cover and change the universal toggle to the desired position (manual (3) or auto reset (4).(Fig. 6c)

Check- out lever: ((5) Fig. 4 & Fig. 7)

Use the check-out lever to manually override the electrical contact position for testing out the system.
Use the check-out lever on low pressure switches to manually override the electrical contact position for evacuating the refrigeration system.

Service / Maintenance:

Disconnect electrical power before service.
In case of repair work or replacing the control always use a new gasket. (K-Types)
According to EN 378-4 during each periodic maintenance, tightness tests shall be carried out at the relevant part of the refrigerating system. This shall apply where appropriate following any repair.

Technical Data:

Medium compatibility| Fluid Group II
R448A, R449A, R513A, R450A, R134a, R452A, R23, R410A, R407C, R404A, R507, R124, R1234ze (A2L)| Fluid Group

R32, R452B, R454B, R454A, R454C, I R455A, R1234yf

---|---|---
Electrical rating| Resistive load (AC1) 24 A / 230 VAC
Inductive load (AC15) 10 A / 230 VAC
Inductive load (DC13) 0.1 A / 230 VDC
3 A / 24 VDC
6 A / 12 VDC
Start-up (AC3) 144 A / 120 VAC / 230 VAC
Motor rating (FLA) 24 A / 120 VAC / 240 VAC
Locked rotor (LRA) 144 A / 120 VAC / 240 VAC| Resistive load (AC1)          10 A / 230 VAC
Inductive load (AC15)        1 A / 230 VAC; 10 A / 24 VAC
Inductive load (DC13)        0.1 A / 230 VDC
3 A / 24 VDC
6 A / 12 VDC
Start-up (AC3)                  –
Moto rating (FLA)             –
Locked rotor (LRA)            –
*) Acc. IEC 60335-2-40 max. electrical load = 2.5 kVA
NOTE: Use proper fuse for short circuit case by considering above voltages/currents
Protection class
(IEC 529/EN 60529)| IP44
Temperature range TS
|Storage / Transport / Ambient / Medium| -50 °C…+70 °C
Max. allowable pressure PS/

Test pressure PT

| See Type code table
Vibration resistance (acc. EN 12263)| 4 g (10…1000 Hz)
Standards| – EN 12263
– PED 2014/68/EU, Category IV for all devices with TÜV approval under EN12263| – LVD 2014/35/EU,
– EN 60947-1, EN 60947-5-1
Marking| 0035 for devices under PED ****pending

for devices under LVD ****all types

| all types (E85974)
all types
Dimensions| See Fig. 2

Type Code:

EMERSON PS1 PS2 Series Pressure Controls - Type Code