MAKING MODERN LIVING POSSIBLE. Solenoid valves Type EVU for fluorinated refrigerants REFRIGERATION AND AIR CONDITIONING.

Transcription

1 MAKING MODERN LIVING POSSIBLE Solenoid valves EVU for fluorinated refrigerants REFRIGERATION AND AIR CONDITIONING Technical leaflet

2 Contents Page Introduction... 3 Features... 3 Approvals... 3 Technical data... 3 Ordering... 4 Accessories... Capacity Design/ Function... Material specifications Dimensions and weight... 1 Danfoss A/S (AC-AKC / frz) 0-0 DKRCC.PD.BD0.A7. / 0H13

3 Introduction EVU solenoid valves can be used in many different refrigeration systems and are specially designed for: Commercial refrigeration systems Refrigeration appliances Liquid coolers Ice cube machines Mobile refrigeration systems Heat pump systems Air conditioning units EVU solenoid valves are designed to fit into compact refrigeration systems. Available in direct and pilot operated versions they can be applied in liquid, suction, and hot gas lines with fluorinated refrigerants. EVU1-6 are straightway and EVU8 angleway design, all braze connected. All valves are hermetically sealed and are not serviceable. The standard coil is available with inch spade power connections. Features Both valve and coil are compact and light weight. Semi-hermetic construction. Stainless steel armature tube top part with metal gasket. Welded bimetal connections on the brass housing Benefits: high strength of joints and high vibration resistance Excellent leak integrity over their wide temperature and pressure range. Bimetal connections permit, fast soldering without the need of wet cloth or heat sink Servo operated mini piston, sturdy and compact solenoid valve Universal application for EVU valve bodies and coils are ordered separately in industrial pack. liquid, suction, and hot gas applications Minimum power coils 8 Watts reduced power consumption Simple and fast mounting of coil snap on/off. - no loose parts. Compact encapsulated coils provide long life even under extreme conditions Refrigerants: R, R134a, R404A, R07, R407C, R4A and future refrigerants Heigh MOPD capacity up to psi Approvals Underwriter laboratories PED (97/3/EC A3.P3) The Low Voltage Directive 73/3/EC with amendments EN EVU valves and coils comply with RoHS Directive 00/9/EC Technical data Refrigerants CFC, HCFC, HFC Temperature of medium Min. Opening differential pressure with standard coil p psi Max. (=MOPD) liquid ) 8 W a.c. Ambient temperature MOPD operating range : 0 up to 7 psi EVU - 8: 0,09 up to psi Temperature of medium ) C v value is the water flow in gal/min at a pressure drop across valve p = 1 psi, ρ = lbs/gal ) MOPD for media in gas form is approximately 14 psi greater 3 ) For coil 08-40V, 60 Hz, MOPD is 0 psi MOPD is measured with highest media and ambient temperature and 1% below nominal voltage Max. working pressure PB psi c v -value 1) ) EVU EVU EVU EVU gal/min 3 DKRCC.PD.BD0.A7./0H13 Danfoss A/S (AC-AKC / frz),0-0

4 1) Rated liquid and suction vapor capacity are based on: Evaporating temperature t e = 40 Liquid temperature ahead of valve t l = 0 Pressure drop p across valve - with liquid p = psi for R134a p = 3 psi for R, R404A and R07 Rated capacity / tons Liquid Suction vapour Hot gas R R134a R404A/R07 R407C R4A R R134a R404A/R07 R407C R4A R R134a R404A/R07 R407C R4A EVU EVU EVU EVU with suction vapor p = 1 psi Rated hot gas capacity is based on: Condensing temperature t c = 0 Hot gas temperature t h = 140 Pressure drop across valve p = psi Metric conversions 1 psi = bar / 9 (t1-3) = 1 C 1 Ton = 3. Kw 1 IN =.4 mm 1 ft = 0.3 m 1 lb = 4 kg 1 oz = 8.3 gram US gal/min = 0.86 m 3 /h Ordering Valve Valve type Design Connections (in.) Code no. 1/4 03F8170 EVU 1/4 03F817 1/4 03F /8 03F8176 EVU 4 3 /8 03F /8 03F818 EVU 1 / 03F8184 EVU 6 Straightway 1 / 03F / 03F8190 Angleway The valve code numbers on above are without sealing O-ring and are only suitable for US-coils with the external frame. Ordering Coils Alternating current a.c. Voltage V Frequency Hz Code no. Industrial pack 40-off Code no. Single pack Power consumption 0," US spade,, 3, 4,, 6, /60 04N830 04N430 Holding: 8 W 04N833 04N VA 04N836 04N436 Inrush: 3 VA Danfoss A/S (AC-AKC / frz) 0-0 DKRCC.PD.BD0.A7. / 0H13 4

5 Accessories Bracket for fixing of valve, industrial pack (40 pcs) Code no. 03F8036. All dimensions in inches DKRCC.PD.BD0.A7./0H13 Danfoss A/S (AC-AKC / frz),0-0

6 Capacity Liquid capacity R Liquid capacity Q 0 tons at pressure drop across valve p psi EVU EVU EVU EVU Capacities are based on Liquid temperature t l = 0 Evaporating temperature t e = 40 Superheat temperature (t e + ) = 0 Liquid capacity R134a Liquid capacity Q 0 tons at pressure drop across valve p psi EVU EVU EVU EVU Liquid capacity Liquid capacity Q 0 tons at pressure drop across valve p psi EVU EVU EVU EVU Liquid capacity R407C Liquid capacity Q 0 tons at pressure drop across valve p psi EVU EVU EVU EVU Liquid capacity R404A/07 R4A Liquid capacity Q 0 tons at pressure drop across valve p psi EVU EVU EVU EVU Metric conversions 1 psi = bar / 9 (t 1 3) = t C 1 ton = 3. kw Correction factors for liquid temperature t l When liquid temperature t l ahead of the expansion valve is other than 0, adjust the table capacities by multiplying them by the appropriate correction factor found in the following table. t l Factor Danfoss A/S (AC-AKC / frz) 0-0 DKRCC.PD.BD0.A7. / 0H13 6

7 Capacity (continued) Suction vapour capacity EVU EVU 4 EVU EVU 6 Pressure drop p psi Suction vapour capacity Pressure drop p psi EVU EVU 4 EVU EVU 6 Suction vapour capacity Pressure drop p psi EVU EVU 4 EVU EVU 6 Suction vapour capacity Qe tons at evaporating temperature t e R Suction vapour capacity Qe tons at evaporating temperature t e R134a R404A/07 Suction vapour capacity Qe tons at evaporating temperature t e DKRCC.PD.BD0.A7./0H13 Danfoss A/S (AC-AKC / frz),0-0

8 Capacity Suction vapour capacity Pressure drop p psi EVU EVU 4 EVU EVU 6 Suction vapour capacity Q e tons at evaporating temperature t e R407C , Suction vapour capacity Pressure drop p psi EVU EVU 4 EVU EVU 6 Suction vapour capacity Q e tons at evaporating temperature t e R4A , , Metric conversions 1 psi = bar / 9 (t 1 3) = t C 1 ton = 3. kw The table values refer to evaporator capacity and are given as a function of evaporating temperature t e and pressure drop p across the valve. Capacities are based on liquid temperature t l = 0 ahead of the expansion valve and superheat t s = 7. For each additional of superheat, the table capacities must be reduced by %. Correction factors for liquid temperature t l When liquid temperature t l ahead of the expansion valve is other than 0, adjust the table capacities by multiplying them by the appropriate correction factor found in the following table. t l Factor Danfoss A/S (AC-AKC / frz) 0-0 DKRCC.PD.BD0.A7. / 0H13 8

9 EVU EVU 4 EVU EVU 6 Pressure drop across valve p psi Hot gas capacity Q h tons Evaporating temp. t e = + 40, hot gas temp. t h = t c + 40, subcooling t u = R R134a R404A/R 07 R407C R4A Condensing temp. t c Condensing temp. t c Condensing temp. t c Condensing temp. t c Condensing temp. t c , , , Metric conversions 1 psi = bar / 9 (t 1 3) = t C 1 ton = 3. kw Correction factors for t h and t e The table values refer to hot gas capacity and are given as a function of condensing temperature t c and pressure drop p across the valve. Capacities are based on a hot gas temperature superheated 40 above condensing temperature (t h = t c + 40). For each additional of superheat above 40, the table capacities must be reduced by 1%. When the valve is used in a hot gas defrost circuit, evaporator temperature affects the capacity. When the evaporator temperature differs from + 40, adjust the table capacities by multiplying them by the appropriate correction factor found in the following table. t l Factor DKRCC.PD.BD0.A7./0H13 Danfoss A/S (AC-AKC / frz),0-0

10 Design / Function Servo operated Direct operated 1. &. Solder connection. & 4. Solder ring 3. Valve housing 6. Union nut 7. Armature tube 8. Return spring 9. Armature. Support ring 11. Pilot plate (servo) 1. Seat plate (servo) 13. Piston (servo) Direct operated is direct operated. When energized, the valve opens for full flow after the armature (9) moves up into the magnetic field of the coil. This means that the valve operates with a minimum differential pressure. Thus, inlet pressure, spring force and the weight of the armature act to close the valve when the coil is not energised. Servo operated EVU, to 8 are servo operated solenoid valves with a "floating" piston. Piston and seat plate are separated and can be moved independent from each other. This servo principle results in a fast operating and compact valve that is able to open against a high differential pressure. The valve closes softly, because the pilot system does not fully close before the main orifice has closed. This reduces force effect and wear of material in the valve and reduces the possibility af liquid hammer in the system. When the coil is not energised, the main orifice, seat plate (1) and pilot orifice (on the pilot plate (11)) are closed. The pilot orifice and main orifice are held closed by the armature weight, the armature spring force and the differential pressure between inlet and outlet sides. When current is applied to the coil, the armature (9) is drawn up into the magnetic field and thus lifts the pilot plate (11) and opens for the pilot orifice so that the depressurizing of the servo chamber (A) starts and the pressure is relieved to the level of the outlet side. As the inlet pressure that acts on the bottom of the piston (13) is now higher than the pressure in the servo chamber (A), the piston is moved upwards and lifts both the pilot plate (11) and the seat plate (1). When the seat plate is lifted, the main orifice opens for full flow. Therefore a minimum differential pressure of 0.09 bar is sufficient to open the valve and keep it open. When the power to the coil is switched off, the spring (8) and armature (9) are pressed down towards the pilot plate (11). The pressure in the servo chamber (A) increases and the piston will no longer be able to hold the seat plate (1) in lifted position, closing the main orifice. The armature (9) continues its downward movement untill the pilot orifice on the pilot plate (11) is fully closed. Danfoss A/S (AC-AKC / frz) 0-0 DKRCC.PD.BD0.A7. / 0H13

11 Material specifications Standard No. Description Material Alloys Mat. no. W.no. DIN EN 1& Bi-metallic tube Stainless steel/ Cu & 4 Solder ring Silver L-Ag 1P CP Valve body Brass CuZn40Pb CW617N Union nut Brass CuZn39Pb CW61N Armature tube Stainless steel X6CrMoS Spring Spring wire stainless XCrNi Armature Stainless steel X4CrMoS18 1.4IL 088 Support ring Teflon PTFE 11 Pilot plate Thermoplast PEEK 1 Seat plate Teflon PTFE 13 Piston Brass CuZn39Pb CW61N DKRCC.PD.BD0.A7./0H13 Danfoss A/S (AC-AKC / frz),0-0

12 Dimensions and weight All dimensions in inches,, 3, 4,, 6, 8 mounted with coil with in. US spade,, 3, 4,, 6, 8 Weight of coil: 8 W: approx. lbs Weight of valve: appox lbs All dimensions in inches Danfoss A/S (AC-AKC / frz),0-0 DKRCC.PD.BD0.A7./0H13 1