Alco Controls - Grobelny

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Electrical Control Valves 6 Electrical Control Valve Technology Thermostatic expansion valves and mechanical regulator valves have been used in the refrigeration and air conditioning industry to control superheat and refrigerant mass flow since its very beginning. As today’s systems require improved energy efficiency, tighter temperature control, wider range of operating conditions and incorporate new features like remote monitoring and diagnostics, the application of electronically operated valves becomes mandatory. Only they offer the controls performance necessary to meet these needs. Electrical control valves are actuators only. For operation in a system they need sensors, valve drivers and controllers, see next page. EX2 is designed for pulse width modulation and therefore able to provide a very precise temperature control. It is applicable to all common CFC, HCFC and HFC refrigerants and is used mainly for refrigeration applications such as display cases. The EX2 valve is a slide type solenoid valve with an orifice for expansion. It is either completely open or completely closed. One common valve body can be combined with 6 interchangeable orifices to cover 7 capacity ranges. EX4/EX5/EX6/EX7/EX8 consist of two main internal assemblies, the valve and the stepper motor. The stepper motor is located next to the electrical plug and connected directly to the slide and cage assembly of the valve. Similar to the technology used in compressors, the motor is exposed to refrigerant and lubricant and the materials used are identical to the ones in compressor motors. The housing of the motor and valve assembly is made from stainless steel and fully hermetic, utilising exclusively brazing and welding technologies and eliminating all gaskets. This design offers several technical advantages such as proportional linear mass flow and a wide capacity range. A common feature of all ALCO electrical control valves is the low internal leakage rate which eliminates the need for additional solenoid valves. Valve Selection For EX2 the published table quotes capacities at 00% duty cycle. i.e. valve open continuously. However, it is recommended to operate the valve at partial load (50-80%) to allow for system load fluctuations. For EX4/EX5/EX6/EX7/EX8 all published capacities are maximum and there are no reserve capacities. Each valve should be selected at lowest possible operating condensing pressure. A larger size of valve leads to a shorter pull down period and a shorter travel time, i.e. faster respond. For example, EX7 has maximum 5 seconds travel time. At 50% capacity operation the valve has only approximately 2.5 seconds travel time. To facilate valve dimensioning for other than the standard conditions ALCO offers an Excel based Selection Tool. This can be ordered from all Copeland sales offices. See www.eCopeland.com for contact addresses, email or phone numbers. Selection Table for Electrical Control Valves and applicable Controllers Valve Function Capacity Feature Min. Main Application Applicable Controller Type Range kW Evaporating Page Page R407C Temperature °C EX Expansion Valve 2.5 - 29.4 Uni polar stepper motor driven -30 Heat pumps, Air Conditioning refrigeration s. data sheet customized s. data sheet EX2 EX4 Exp. Valve 0,6 - 8,7 PWM -40 refrigeration 0 EC2 30 EX5 EX6 EX7 Expansion Valve 5 - 53 2 - 26 35 - 347 Bi polar stepper motor driven - 00 - 00 -50 Heat pumps, Refrigeration, A/C, water chillers 4 EC3-X3... Superheat Contr. EC3-3.. Cold room Contr. 28 33 EX8 95 - 925 -50 EX5 - 6 EX6 EX7 Capacity Control 3 - 37 3 - 3 Bi polar stepper motor driven Hot gas bypass regulator 22 EXD-U.. Universal Contr. 29 EX8 35 - 399 EX6 EX7 EX8 Capacity Control 0.3 - 3.9 - 4 4 - 42 Bi polar stepper motor driven -50 Suction pressure regulator 23 EXD-U.. Universal Contr. 29 EX5 .5 - 8 EX6 EX7 Liquid Mass Flow Control 4 - 43 5 - 53 Bi polar stepper motor driven Condensing pressure regulator 25 EXD-U.. Universal Contr. 29 EX8 45 - 463 EX5 5 - 53 - 00 EX6 EX7 Liquid Level Control 2 - 26 35 - 347 Bi polar stepper motor driven - 00 -50 Liquid level regulator 25 EXD-U.. Universal Contr. 29 EX8 95 - 925 -50 A2.5. /0604/E
Electronic Valve Drivers and Controllers A2.5. /0604/E ALCO designed a large number of electronic controllers for most requirements of commercial refrigeration and air-conditioning applications. They can be grouped into stand alone and networked products. The stand alone controllers typically reproduce the function of a mechanical valve, like superheator pressure control, but offering advantages of application of electrical control valves. The networked controllers normally combine more functions (superheat control, temperature control, alarming, defrost) with network capabilities. Stand Alone Controllers and Superheat Controllers with WebServer functionality EC3-X32 / -X33 Superheat Controllers control the opening of electrical control valves according to desired superheat. As ALCO electrical control valve is able to provide positive shut-off function better than conventional solenoid valve, there will be no flow through ALCO EXV as long as the compressor is not running. In the event of cooling request and compressor start up, driver module needs to be informed. This can be achieved by a digital input. Driver module will start to control the refrigerant mass flow stand alone by precise positioning of the electronic expansion valve under different operating conditions such as compressor start up, start of further compressor, high head pressure, low head pressure, high load, low load and partial load operation. Driver module is capable for diagnostics and alarm. The alarm can be received directly from driver module via digital output as well as optical LED on optional Display Unit. The controllers can be started after completion of wiring without any parameter setting. EXD-U Universal Drivers are stepper motor drivers. EXD-U universal driver modules enable the operation of ALCO stepper motor driven valves EX4/EX5/EX6/ EX7/EX8 as: Electronic expansion valve, Capacity control by means of hot gas bypass or evaporating pressure regulator, Crankcase pressure regulator, Condenser pressure regulator, Liquid level and Liquid injection. The driver module requires an analogue input with 4 to 20mA or 0 to 0V. The output is the opening/ closing of EX4/EX5/EX6/EX7/EX8 and consequently the control of refrigerant liquid or vapour mass flow in accordance with analogue input. The universal driver module can be connected to any controller which can provide a 4-20mA or 0- 0V analogue signal. This gives extreme flexibility to system manufacturers to use any desired controller in conjunction with universal driver module to achieve different functionality. Selection Table Universal Controllers Stand alone or with WebServer functionality Description Stand alone TCP/IP Page Superheat Controller for stepper motor driven electrical control valves EC3-X33 EC3-X32 28 Universal Driver Module EXD-U 29 Selection Table Electronic Controllers with Network Communication Description FTT-10 TCP/IP Page Display Case and Cold Room Controllers Electronic Controller: Temperature + Superheat Control of EX2 (pressure/temperature input) EC2-35 EC2-352 30 Electronic Controller: Temperature + Superheat Control of EX2 (temperature/temperature input) EC2-3 EC2-3 2 30 Electronic Controller: Thermostat, for TXV EC2-2 EC2-2 2 30 Coldroom Controller: Thermostat + Superheat Control of EX5 .. EX8 (Stepper Motor) EC3-33 EC3-332 33 Rack- and Condenser Controllers Condenser Controller for up to 4 Fans EC2-7 EC2-7 2 36 Condenser Controller with Fan Speed Control EC2-74 EC2-742 36 Condensing Unit Controller for 2 comps. / 2 fans, on / off control - EC2-5 2 36 Condensing Unit Controller for 2 comps. on / off contr; 0 ... 0V output for FSP Speed Control - EC2-542 36 Condenser Controller for 6 Fans + TRIAC for Fan Speed Control EC3-75 EC3-752 40 Rack Controller for 4 Compressors EC3-6 EC3-6 2 40 Rack Controller for 8 Compressors EC3-64 EC3-642 40 Rack Controller for Capacity Controlled Compressors EC3-67 EC3-672 40 Dual Rack Controller for 4 + 3 Compressors EC3-8 EC3-8 2 40 Rack & Condenser Controller, 4 Compressors + 3 Fans + TRIAC for Fan Speed Control EC3-92 EC3-922 40 Universal Controllers With 2 digital inputs, 3 temperature inputs, 4 relay outputs EC2- EC2- 2 3 With 2 digital inputs and 2 digital outputs EC3- EC3- 2 * * ask <strong>Alco</strong> <strong>Controls</strong> product management for more information 7
Page 1 and 2: Alco Controls Components for the Re
Page 3 and 4: A2.5. /0604/E Electrical Control Va
Page 5 and 6: Fan Speed, Temperature and Pressure
Page 7: A2.5. /0604/E Electrical Control Va
Page 11 and 12: A2.5. /0604/E EC2 Series The compac
Page 13 and 14: Liquid Correction Factor K t Temper
Page 15 and 16: Electrical Control Valves Series EX
Page 17 and 18: Application Expansion Valve and Liq
Page 23 and 24: Application Hot Gas Bypass - Nomina
Page 25 and 26: Application Suction Pressure Regula
Page 27 and 28: Application Condensing Pressure Reg
Page 29 and 30: A2.5.1/0601/E Electronic Controller
Page 31 and 32: Universal Driver Modules Series EXD
Page 33 and 34: Selection Table Alco EC2 Series Con
Page 35 and 36: Coldroom Controller Series EC3 with
Page 37 and 38: Block Diagram EC3-33x Coldroom Cont
Page 39 and 40: A2.5.1/0601/E 37
Page 41 and 42: Selection table A2.5.1/0604/E TCP/I
Page 43 and 44: Block Diagrams EC3-61x Rack Control
Page 45 and 46: Accessories (continued) Description
Page 47 and 48: Electronic Smart Starter ESC-255 Or
Page 49 and 50: Technical Data Supply Voltage Nomin
Page 51 and 52: Monitoring Server Series AMS-500 wi
Page 53 and 54: A2.5.1/0601/E Thermo Expansion Valv
Page 55 and 56: A2.5.1/0601/E Example Cooling capac
Page 57 and 58: TIS(E) Valve bodies - solder type m
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Condensing Temperature °C +30 R 22
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Thermo ® -Expansion Valve Series T
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Thermo ® -Expansion Valve Series T
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Correction Tables for Thermo Expans
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Liquid Correction Factor K t Temper
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Accessories Correction Tables for S
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Accessories A2.5.1/0601/E Available
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Accessories Correction Tables for S
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A2.5.1/0601/E Solenoid Valves 77
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Coils ASC Type Order-Nr. Voltage Po
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2-Way Solenoid Valves Series 540 No
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2. Liquid Application Liquid Correc
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A2.5.1/0601/E Mechanical Pressure R
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Hot Gas Bypass Regulators Series AC
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Head Pressure Control Valves Series
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Evaporator and Crankcase Pressure R
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A2.5.1/0601/E Fan Speed Controllers
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Selection Table Cable Assemblies wi
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Selection Dependent on Product Comb
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A2.5.1/0601/E Pressure Controls and
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A2.5.1/0601/E Standards and Regulat
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Single Pressure Controls Series PS1
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Dual Pressure Controls PS2 TÜV / E
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Pressure Controls Series PS3 / Stan
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Differential Pressure Controls Seri
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Function of contacts A2.5.1/0601/E
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Type Order-No. Adjustment Range Low
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A2.5.1/0601/E System Protectors, Mo
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Bi-flow Filter Driers Series BFK he
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Connections Type Order Connection A
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Connections Type Order Connection A
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Filter-Drier Shells With Quick-Cap
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Correction Tables for Filter Driers
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Suction Line Filters and Filter Dri
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A2.5.1/0601/E Nominal capacity at +
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Moisture Liquid Indicators Series A
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A2.5.1/0601/E Oil Management Compon
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Electronic Oil Level Management Sys
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Oil Separator Series OS A2.5.1/0601
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A2.5.1/0601/E Shut-off Valves, Misc
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Ball Valves Series BVA Technical Da
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Rotalock-Design- Solder (ODF), copp
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Rotalock Adapters - Solder (ODF), c
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Cast Iron Valves with 4-Hole Flange
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Nut with Alumina Gasket to seal Rot
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A2.5.1/0601/E Accessories & Spare P
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Thermo - Expansion Valves Solenoid
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Filter Driers Indicators Others A2.
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A2.5.1/0601/E Appendix 157
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Saturation Pressure Table for Refri
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Suction accumulators (cond’t) Pro
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Shut-off valves / adapters Product
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ALCO Controls - Emerson Electric Gm
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Alco Controls - Grobelny

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