ANSI/AHRI 760:2007 pdf download.Performance Rating of Solenoid Valves for Use with Volatile
Refrigerants.
3.8.1 Shall. Where “shall” or “shall not” is used for a provision specified, that provision is mandatory if compliance with the standard is claimed.
3.8.2 Should. ‘Should” is used to indicate provisions which arc not mandatory but which arc desirable a.s good practice.
3.9 Solenoid Valve. A valve which is actuated by the magnetic action of an electrically energized coil. The opposite action is accomplished by gravity. pressure or spring action.
3.9.1 Direct-Action Solenoid Valve. A valve in which the magnetic power of an electrically energized coil moves the main port (orifice) closure member.
3.9.2 Normally Closed Solenoid Valve. A valve which is closed when dc-energized. When the coil is electrically energized. the closure member is moved away from and off the port (orifice) to cause the opening action.
3.9.3 Normall Open Solenoid Valve. A valve which is open when dc-energized. When the coil is electrically energized, the closure member is moved toward and onto the port (orifice) to cause the closing action.
3.9.4 Pilot-Operated Solenoid Valve. A valve in which the motion of a direct-acting member allows a pressure difference to occur across the main port (orifice) closure member, causing it to move,
3.10 Solenoid Valve (‘opacity. The mass flow rate of a fluid through the Solenoid Valve, equated to tons of reingeration 1kw] at the specified conditions.
Section 4. Test Requirements
4.1 apacitv Tests. All capacity tests shall be in accordance with the test procedure outlined in ANSI/ASHRAE Standard
158.1.
4.2 MOPD Tests. All MOPD tests shall be in accordance with the test procedure in Appendix C.
4.2.1 If the Solenoid Valve MOPD depends on the valve position, the valve shall be tested in all positions for which the ratings apply.
Section 5. Rating Requirements
5.1 Rating Requirements. Published capacity ratings shall consist of Standard Ratings and may include Application Ratings. The AHRI Standard Ratings of Solenoid Valve Capacity for Volatile Refrigerants shall be stated in tons of refrigeration I kWJ and at the conditions specified in Table I
5.2 Standard Rating conditions. Standard ratings shall be for liquid service applications of solenoid valves per Table I.
5.2.1 Liquid Service Solenoid Valve Entrance (‘onditions.
a. Saturated Condensing (Deit Point) Temperature: II OF (43.3Cj
b. Liquid Service Temperature: I (X)°F 137.8°CI
c. Saturated Evaporating (Rubble Point) Temperature: 40°F I4.4C1
5.2.2 Pressure Drop Values’.
5.2.2.1 Liquid Service. The Pressure Drop across the Solenoid Valve shall be the closest integer value in psi [kPaJ equivalent to a 1.0 “F 10.6 “C] drop in saturation temperature.
5.2.3 In no case shall the Pressure Drop be less than required for proper operation of the Solenoid Valve.
Table 1. Standard Rating Conditions
5.2.4 The solenoid valve capacity ratings for refrigerant liquid service shall be based on the method described in C4. I.
5.2.6 Ens halpv of the Rrfrigeruni Suction Gas (he). Enthalpy based on vapor at a dew point pressure corresponding to leaving the evaporator.
5.3 MOPD Ratings. MOPD ratings shall be obtained in accordance with 4.2 and Appendix C. and shall be stated in psi IkPaI.
5.3.1 If the solenoid valve MOPD depends on the valve orientation, then it shall be rated for the orientation that results in the lowest MOPD pressure.
5.4 Application Ratings. Application Ratings give performance data at operating conditions other than those given above. Applications Ratings shall contain all information shown in 6.2. Published Ratings shall be subject to the tolerances of this standard
5.4.1 1.iquid Service.
5.4.1.1 In addition to AIIRI standard capacity ratings at pressure drop values specified in Table I. capacity ratings may also be given at other pressure drop values, provided that they are specified as such and based on all the other conditions given in 5.2.
5.4.2 Suction Service.
5.4.2.1 The Pressure Drop shall be 1.0 psi [6,9 kPaj for all refrigerants unless the manufaciurers stated lowest pressure differential is greater than 1.0 psi 16.9 kPaI for satisfactory operation.
5.4.2.2 Solenoid Valves requiring greater than 1.0 psi 16.9 kPaJ pressure differential shall show an Al-IRI Standard Rating at the manutacturer’s stated lowest pressure diffirential required for satisfactory operation.
5.4.2.3 Entlwlpv of the Refrigerant Suction Gas (he). Enthalpy based on vapor at a dew point pressure corresponding to 4(F I44’C1 leaving the evaporator
5,4.3 Discharge Gas Service.
5.4.3.1 The Pressure Drop shall be 2.0 psi 114 kPaI for all refrigerants.
5.4.3.2 Discharge Gas Temperature. The temperature that would result from isentropic compression from the saturated evaporator(l)ew Point) temperature with 25XrF 1l3.9CI superheat. to a saturated condensing (Bubble Poino temperature of I 10F [43.3C] with 50.0’F 127.W’CI added as an approximation ol the actual polytropic refrigerant compression process.
