Instruction Sheet PA-00318 June 2013 Electrical Control Valves EX4/EX5/EX6/EX7/EX8 Electrical Control Valves EX4/EX5/EX6/EX7/EX8 EX4/5/6/7/8 are stepper motor driven valves for precise control of refrigerant mass flow in refrigeration, air conditioning, heat pumps, industrial cooling process and close control systems as: - Expansion valves - Liquid injection for subcooling and desuperheating - Capacity control: hot gas bypass regulator - Capacity control: suction pressure regulator - Head pressure regulator - Liquid level regulator - Crankcase pressure regulator Installation: Safety Instructions: •After completion of installation, a test pressure must be carried out as follows: - According to EN378 for systems which must comply with European pressure equipment directive 97/23/EC - To maximum working pressure of system for other applications •Read installation instructions thoroughly. Failure to comply can result in device failure, system damage or personal injury. •It is intended for use by persons having the appropriate knowledge and skill. Before attempting to install the valve make sure pressure in system is brought to and remains at atmospheric pressure. •Do not release any refrigerant into the atmosphere! •Do not use any other fluid media without prior approval of Emerson Climate Technologies. Use of fluid not listed could result in: C hange of hazard category of product and consequently change of conformity assessment requirement for product in accordance with European pressure equipment directive 97/23/EC. •Do not operate valve connected directly to supply voltage. Use applicable stepper motor driver. •Switch off all voltages / currents before cabling. •Do not operate system before all cable connections are completed. • Do not operate the valve when the compressor is not running. •Do not operate the valve when system is under vaccum except for closure of valve before refrigerant charging. •Comply with local electrical regulations when wiring. Mounting location: •Expansion valve and liquid injection application: - The valve must be installed in horizontal position to vertical position (Fig. 1) - For best result, locate the valve as close as possible to the distributor or inlet of evaporator •Hot gas bypass applications: - Electrical connection must be downward (as per Fig 1). - Install the valves as far as possible from compressor discharge. - It is also recommended to install a check valve (2) on main hot gas pipe going to condenser after branch line into the valve (1) (see Fig. 2). •Suction line application: - Electrical connection must be downward EmersonClimate.com/FlowControls •For uni-flow valves the arrow must point in the direction of refrigerant flow. •EX4/EX5/EX6/EX7/EX8: Apply brazing for copper to stainless steel with minimum 30% silver brazing rod and required flux (see Fig. 5). - When brazing, direct flame away from valve. Use wet rags or other suitable heat protection. - It is recommended to use transportation support for EX8. Leakage test: Warnings: 1) Failure to do the following could result in loss of refrigerant and personal injury. 2) The pressure test must be conducted by skilled persons with due respect regarding the danger related to pressure. •Protect the valve against vibration. If the total valve weight results in excessive stress to the piping joints, the valve must be supported by suitable mounting bracket(s). •The valve must be protected against contaminants. Install an Emerson filter drier before the valve. Check for sufficient refrigerant charge/subcooling and make sure no flash gas is present at the inlet of valve before attempting to check valve operation. Install an Emerson sight glass AMI or MIA before the valve. Wiring and mounting of plug: •(Fig. 3 A = White, B = Black, C = Blue, D: Brown): Prewired plug and cable assembly (EX5-N/L/C...) is ready for connection to the valve. There is no specific requirement for positioning of plug on pins (see Fig. 6). Push the plug on pins on top of the valve. Rotate the nut one turn in clockwise direction and push the plug. Repeat this procedure until the plug is tightened. Wiring to driver/controller: See wiring diagram of assosiated driver or controller. Warning: Improper wiring will result wrong direction of rotation or no rotation of stepper motor. See installation instruction of electronic board. Operation: See operation manual of associated electronic driver/controller. Warning: Service hints: All valves are delivered at half open. Do not charge system before closure of valve. See operating instruction of associated driver/controller. •Do not apply motor voltage/current out of specified range. •For motor check, use an ohmmeter with suitable range as shown in Fig. 3 •EX4/EX5/EX6/EX7/EX8 has capability of positive shut-off when it is driven to fully close position. Technical Data Type EX4 Maximum working pressure Operating temperature at motor Connection, DN/ Dimensions Fluid group EX5 EX6 EX7 Refrigerant: CFC, HCFC, HFC ✔ ✔ ✔ Hazard category: PED 97/23/EC - - I Nominal Supply Voltage U: 24 VDC Maximum Current Imax.: 0.5 A Marking not applicable ✔ EX8 EX4/EX5/EX6 EX7 Figure 1 Figure 2 TC EmersonClimate.com/FlowControls EX8 652.5 psi Uni-flow versions: –58°F … +212°F, Bi-flow versions: -40°F … +176°F see Fig. 4 II 2 ✔ I ✔ I 0.75 A 0.8 A ✔ ✔ Figure 3 EX4/EX5/EX6/EX7/EX8 EXV EX5-N60 Plug and cable assembly Figure 4 EX4/EX5/EX6/EX7 EX8 EXV ØA x ØF (ODF) B EX4-I21 EX5-U21 EX6-I21 EX7-I21 EX8-I21 3/8" x 5/8" 5/8" x 7/8" 7/8" x 1-1/8" 1-1/8" x 1-3/8" 1-5/8" x 1-5/8" 0.31.82.20.44.41.0 0.4 2.2 2.6 0.6 4.4 1.0 0.62.63.00.74.41.0 0.83.13.20.96.21.7 0.83.13.10.87.92.2 C Figure 5 D Figure 6 EX4/EX5/EX6/EX7/EX8 EmersonClimate.com/FlowControls 3 E H1 H2 EmersonClimate.com/FlowControls Technical Support: 1-866-625-8416 PA-00318 (06/13) Emerson is a trademark of Emerson Electric Co. ©2013 Emerson Climate Technologies, Inc. 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