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Emerson Climate TechnologiesEmerson Climate Technologies
53
Temperature-Pressure Controls
Emerson Climate Technologies
FSX Introduction
FSX electronic speed controllers are designed to
control the speed of fan motors in commercial refrigera-
tion system depending on condensing pressure chang-
es. It is suitable for single phase. FSX can be used in
air-cooled condensers, air-cooled condensing units and
air-conditioning units.
Using variable fan speed controllers offers the
following benets in commercial refrigeration or air-
conditioning applications:
• Head pressure can be kept high enough to ensure
proper operation of the expansion valve, and sufcient
mass ow through the expansion valve to feed the
evaporator. This maintains the required cooling capacity.
• Efciency increase of the compressor by controlling
the head pressure, improved performance and energy
saving for the complete system.
• The noise of the motor can be kept at a minimum by
avoiding permanent on/off cycling.
Figure 1 – FSX Output Voltage Versus Input Pressure
Supply
Vo
ltage
230
V
Output
Voltage
99%
Maximum range
Minimum
range
50%
Cut-off
0%
Proportional range
Pressure (bar)
Proportional range:
FSX-41_: 2,5 bar
FSX-42_: 3,8 bar
FSX-43_: 4,6 bar
FSX-43S
Description of control behavior
FSX control behavior can be easily described by
looking at the function of output voltage versus input
pressure (see gure 1) and by dividing it into maximum,
proportional and minimum range.
In the maximum range, the FSX provides a constant
output voltage of about 1% below the supply voltage.
The fan runs at maximum speed.
Along the proportional range the output voltage var-
ies between maximum and minimum voltage of approxi-
mately 50% of the supply voltage. This causes the fan
speed to slow down from maximum speed to minimum
speed.
Further decrease of pressure in the minimum range
leads to cut-off of the fan motor. Increase of input pres-
sure will start the motor with a hysteresis of approxi-
mately 10 psig to avoid cycling (Fig. 1).
The pressure from which motor is cut off (FSX), see
column “pressure range” in the selection chart. The pro-
portional range is xed at:
36 psig for FSX-41_/FSM-41_
55 psig for FSX-42_/FSM-42_
66 psig for FSX-43_/FSM-43_
- 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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