Emerson Fluid Chiller Průvodce řešením problémů Strana 11
- Strana / 72
- Tabulka s obsahem
- ŘEŠENÍ PROBLÉMŮ
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
7
Thermal Expansion Valves
Emerson Climate Technologies
Application Tips
For best evaporator performance, the TXV should be
installed as close to the evaporator as possible and in
an easily-accessible location for adjustment and servic-
ing. On pressure drop and centrifugal type distributors,
apply the TXV as close to the distributor as possible.
(See g.7)
sion and faulty remote bulb contact with the line.
On lines smaller than 7/8” OD the remote bulb may
be installed on top of the line. With 7/8” OD and over,
the remote bulb should be installed at the position of
about 4 or 8 o’clock. (See g. 8)
It is good practice to insulate the bulb with a material
which will not absorb moisture.
Remote Bulb Well
A remote bulb well will improve the sensitivity of the
remote bulb. This occurs with short coupled installations
and installations with large suction lines (2-1/8” OD or
larger). Remote bulb wells should be used when low
superheat is desired or where converted heat from warm
rooms can inuence the remote bulb. (See g. 9).
Remote Bulb Location
Since evaporator performance depends on good TXV
control, and TXVs respond to the temperature change of
the refrigerant gas leaving the evaporator, care must be
given to types of remote bulbs and their locations. The
external remote bulb meets the requirements of most
installations. The bulb should be clamped to the suction
line near the evaporator outlet on a horizontal run. If
more than one TXV is used on adjacent evaporators or
evaporator sections, make sure that remote bulb of each
TXV is applied to the suction line of the evaporator fed
by that TXV.
Clean the suction line thoroughly before clamping the
remote bulb in place. When a steel suction line is used,
paint the line with aluminum paint to reduce future corro-
Never install a remote bulb in a location where the
suction line is trapped (See g. 10). If the liquid refriger-
ant collects at the point of remote bulb location the TXV
operation will be erratic.
- 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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