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Emerson Climate TechnologiesEmerson Climate TechnologiesTemperature-Pressure Controls
52
Emerson Climate Technologies
PSC Pressure Switch
The Emerson PSC is a Pressure Switch with xed
switch-point settings.
Features
• Maximum Operating Pressure up to 623 psig Test
Pressure up to 696 psig
• Standard factory settings from stock in small volumes
• High and low pressure switches
• High temperature version with snubber for direct com-
pressor mounting (Range 6)
• Direct mounting reduces the number of joints and thus
avoiding potential leakage
• Precise setting and repeatability
• IP 65 protection if used with the cables with plug
Options
• For direct mounting on a pressure connection
(free standing) or with a capillary tube
• Direct compressor head mounting with high
temperature bellows and snubber
- reduces the number of joints
- avoids potential leakage
- saves high cost of exible hose
• TÜV approved versions for high and low pressure
• Micro-switch for narrow pressure differentials
• Gold plated contacts for low voltage/current
applications
• Cables with plug ordered separately
PSC Introduction
PSC is equipped with a SPDT snap action contact,
switching from 1-2 to 1-4 on rising pressure and from 4
to on falling pressure (see diagram). Several models are
available:
• Low pressure switch, with automatic or manual reset
• High pressure switch, with automatic or manual reset
• DIN/TÜV approved safety high pressure limiter with
automatic reset
• DIN/TÜV approved safety high pressure cut-out, with
internal or external manual reset
TÜV approval for pressure switches can be reached
either by using a double diaphragm (Pressure range
1-5) which acts in a fail-safe mode or by a single pres-
sure element (Bellows, Pressure range 6) which is able
to resist to >Mio. cycles between 50% and 100% of the
maximum operating pressure (see 4.6.1 of EN 12263).
PSC
1
P
2
4
+
-
Bellows (Pressure Range 6)
Single Diaphragm
- Technical 1
- Help Guide 1
- Introduction 3
- Table of Contents 4
- Thermal Expansion 5
- Thermal Expansion Valves 6
- Internal Equalizer 6
- Factory Settings of TXVs 7
- External Equalizer 7
- Superheat 9
- Approximate Methods 9
- Superheat Adjustment 9
- TXV Selection 10
- Application Tips 11
- Remote Bulb Well 11
- Remote Bulb Location 11
- Operation at Reduced Capacity 12
- Gas & Gas Cross-Charges 14
- Which Charge to Use? 14
- Adsorption Charges 14
- Liquid Cross-Charges 14
- Other TXV Considerations 15
- Refrigerant Code Names 16
- Emerson MOP 16
- TXV Charge Code Selector 17
- Electronic Valves 18
- & Controls 18
- Electronic Valve Applications 19
- Emerson Climate Technologies 20
- EC3-32 and EC3-33 Systems 20
- Temperature Sensor ECN-N60 20
- Pressure Transmitter – PT4 21
- TXV Controller – EC3-X32 21
- TXV Controller – EC3-X33 22
- Universal Driver – EXD-U00 22
- XEV22 Superheat Controller 22
- Electrical Control Valve – EX 23
- Third Party Controller 23
- Electronic Valves Programming 24
- Solenoid Valves 25
- What Are Solenoid Valves? 26
- 2. Pilot Operated Valve 27
- Types of Solenoids 27
- 2-Way Valves 27
- Solenoid Valve Selection 28
- Application Overview 29
- System Protectors 30
- Absorption vs. Adsorption 32
- Types of Filter driers 32
- Dirt, Waxes, Acid 32
- Sightglass 33
- Suction Filter Driers 34
- Internal Design 35
- Compressor Burnout 36
- Filter Driers for Heat Pumps 37
- Removing Contaminants 37
- One-Way Flow, Both Directions 37
- Simplifying While Servicing 38
- Emerson System Protectors 38
- Regulators 39
- EVAPORATOR 40
- INTERMEDIATE 40
- Figure 3: EPRB(S) Brass Body 41
- (Emerson EPRB) 42
- HeadMaster HP Operation 43
- solenoid VAlVe 46
- Figure 8 47
- Adjusting the Set Point 48
- Oil Controls 49
- Emerson Oil Controls 50
- Temperature 51
- Pressure Controls 51
- Temperature Pressure Controls 52
- TS1 Introduction 52
- Housing Variants 52
- Temperature Sensing 52
- Setpoints 53
- Electrical Contacts 53
- Contact Function 53
- PSC Pressure Switch 56
- PSC Introduction 56
- FSX Introduction 57
- Basic Rules of 58
- Good Practice 58
- Basic Rules of Good Practice 59
- Troubleshooting 61
- SYSTEM TROUBLESHOOTING GUIDE 62
- No Superheat At Start Up Only 63
- Superheat Is Erratic Or Hunts 63
- Troubleshooting Ball Valves 68
- Troubleshooting Regulators 69
- R404A/R507A 70
- Wholesaler/Contractor Support 72
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