Electrically operated valves for CO 2 Type CCM - Gas bypass & Expansion
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1 MAKING MODERN LIVING POSSIBLE Data sheet Electrically operated valves for CO 2 Type CCM - Gas bypass & Expansion The CCM is an electrically operated valve designed specifically for operation in CO 2 systems. The valve is capable of functioning both as an expansion valve, and as a gas bypass valve with back-pressure regulation in subcritical applications. The pressure rating allows for operation in environments where system standby capability is required without the need for auxiliary cooling systems during servicing or power outages. Features Up to 90 bar (1305 psi) working pressure to accomodate CO 2 system pressures during standstill conditions. Precise positioning for optimal control of intermediate pressures in transcritical CO 2 systems or liquid injection in heat exchangers. MOPD up to 50 bar (725 psi). Combined stainless steel butt weld/solder connections for installation in copper piped systems (K65 alloy or standard) as well as steel piped systems. Standard M12 connector for simple and flexible connection to the motor driver. For manual operation and service of the CCM an AST-g service driver is available. For further information please contact Danfoss (Commercial Refrigeration and Air Conditioning Controls). UL recognized. Danfoss A/S (AC-MCI sw) DKRCI.PD.VK1.A4.02 / 520H7650 1
2 Technical data Parameter CCM Compatibility R744 MOPD 50 bar (725 psi) Max. working pressure (PS/MWP) 90 bar (1305 psi) Refrigerant temperature range 40 C to 60 C ( 40 F to 140 F) Ambient temperature 40 C to 60 C ( 40 F to 140 F) Material of construction Stainless steel Electrical data Parameter CCM Motor enclosure IP 67 Stepper motor type Step mode Bi-polar - permanent magnet 2 phase full step Phase resistance 52Ω ±10% Phase inductance Holding current Step angle Nominal voltage 85 mh Depends on application. Full current allowed (100% duty cycle) 7.5 (motor), 0.9 (lead screw), Gearing ration 8.5:1. (38/13) 2 :1 (Constant voltage drive) 12 V dc -4% +15%, 150 steps/sec. Phase current (Using chopper drive) 100 ma RMS -4% +15%, Max. total power Voltage / current drive: 5.5 / 1.3 W (UL: NEC class 2) Step rate 150 steps/sec. (constant voltage drive) steps/sec. 300 recommended (chopper current drive) Total steps CCM 10, 20, [+160 / -0] steps CCM [+160 / -0] steps Total stroke 13 mm / 16 mm (0.5 in. / 0.6 in.) Full travel time CCM 10, 20, / 8.5 sec. (voltage / current) CCM / 11.5 sec. (voltage / current) Lifting height CCM 10, 20, mm (0.5 in.) CCM mm (0.6 in.) Reference position Electrical connection Overdriving against the full close position 4 wire 0.5 mm 2 (0.02 in 2 ), 0.3 m (1 ft) long cable Stepper motor switch sequence: CCM valve Connector Cable plug 4 Black 4 3 White 3 2 Green 2 1 Red 1 Connection 1 Wire Color Connection 2 Pin Out Stepper motor switch sequence: Coil I Coil II STEP Red Green White Black CLOSING OPENING DKRCI.PD.VK1.A4.02 / 520H7650 Danfoss A/S (AC-MCI sw)
3 Design 1. Cable 2. Glass seal 3. Motor housing 4. Stepper motor 5. Bearing 6. Spindle 7. Insert 8. Valve piston 9. Valve seat 10. Valve port Danfoss A/S (AC-MCI sw) DKRCI.PD.VK1.A4.02 / 520H7650 3
4 Valve operation The CCM can be used in a variety of applications within CO 2 refrigeration systems. Typically it is used as a gas bypass valve in a transcritical CO 2 booster system or as an expansion valve. EKC 326A AKS 2050 Danfoss R AKS 2050 ICMTS CCM To cases From cases Application 1 A gas bypass valve is typically used to regulate the intermediate pressure in a transcritical CO 2 refrigeration system. By venting flashgas generated after the transcritical expansion, the pressure can be kept at a safe level for all components situated in the liquid lines of a transcritical CO 2 system. For use in the gas bypass application the EKC326A controller is recommended. EKC 316A AKS 11 AKS 33 CCM EVR GBC GBC Danfoss R Application 2 A liquid expansion valve is typically used for injection in plate heat exchangers of CO 2 /CO 2 cascades, or as an expansion valve for CO 2 evaporators. For the liquid injection applications CCM is used with EKC 316A controller. Product File nam Date 4 DKRCI.PD.VK1.A4.02 / 520H7650 Danfoss A/S (AC-MCI sw)
5 Valve operation (Cont.) Danfoss A/S (AC-MCI sw) DKRCI.PD.VK1.A4.02 / 520H7650 5
6 Valve operation (Cont.) 6 DKRCI.PD.VK1.A4.02 / 520H7650 Danfoss A/S (AC-MCI sw)
7 Sizing and capacities The following tables indicate nominal capacities of the valve in the gas bypass application and in the liquid expansion application with R744 (CO 2 ) as refrigerant. Capacities are given for varying operating conditions within the normal range of the valve. If the capacity shown in the table is higher than 75% of the required capacity, then it is recommended to use a valve one size larger, or as an alternative, to use an additional valve in parallel. Gas Bypass Application The capacities shown are based on the amount of flash gas produced when expanding from supercritical CO 2 before the transcritical expansion valve (ICMTS) at 35 C and the corresponding optimal high pressure setting (89 bar) as set by the Danfoss EKC326A controller. The capacities shown are the total system evaporating capacity at the given evaporating temperature. CCM 10- Gas Bypass Application - System Evaporator Capacity [kw] Inlet Pressure [bar] Evaporating temperature [ C] CCM 20 - Gas Bypass Application - System Evaporator Capacity [kw] Inlet Pressure [bar] Evaporating temperature [ C] CCM 30 - Gas Bypass Application - System Evaporator Capacity [kw] Inlet Pressure [bar] Evaporating temperature [ C] Danfoss A/S (AC-MCI sw) DKRCI.PD.VK1.A4.02 / 520H7650 7
8 Gas Bypass Application (continued) CCM 40 - Gas Bypass Application - System Evaporator Capacity [kw] Inlet Pressure [bar] Evaporating temperature [ C] Liquid Expansion Application Valve capacities when operating as an expansion valve are given in the following table for different evaporating tempratures (t e ) and varying pressure differences over the valve. The values shown are based on 0.1 K liquid subcooling at the inlet to the valve and no useful superheat. Capacities can be adjusted for different levels of subcooling by multiplying the capacity found in the table below, by the capacity correction factor found in the subsequent table. CCM 10 - Liquid Expansion Application - Evaporator Capacity [kw] Evaporating Pressure drop p [bar] temperature t e [C ] CCM 20 - Liquid Expansion Application - Evaporator Capacity [kw] Evaporating Pressure drop p [bar] temperature t e [C ] DKRCI.PD.VK1.A4.02 / 520H7650 Danfoss A/S (AC-MCI sw)
9 CCM 30 - Liquid Expansion Application - Evaporator Capacity [kw] Evaporating Pressure drop p [bar] temperature t e [C ] CCM 40 - Liquid Expansion Application - Evaporator Capacity [kw] Evaporating Pressure drop p [bar] temperature t e [C ] Inlet pressure [bar] Capacity correction factor for liquid subcooling Subcooling [K] Ordering Valve incl. actuator - Single pack Type K V m 3 /h Connections (Combi) Weld 1) [in] Solder ODF x ODF [in] Code nos single pack CCM /2 x 1/2 5/8 x 5/8 027H7188 CCM /4 x 3/4 7/8 x 7/8 027H7187 CCM x 1 1 1/8 x 1 1/8 027H7186 CCM x 1 1 1/8 x 1 1/8 027H7185 1) OD according to EN Accessories: Type Description Code number Cable with M12 connector - 8 meter (26.2 ft.) 034G2323 AST-G Manual valve driver for service 034G0013 Spareparts: Type Description Code number AST Actuator for CCM CO2 valve 027H7184 O-ring spare part kit for CCM/CCMT (2 O-rings) 027H7230 Danfoss A/S (AC-MCI sw) DKRCI.PD.VK1.A4.02 / 520H7650 9
10 Dimension and weight Type H 1 H 2 H 3 L 1 ØD 1 Weight mm in. mm in. mm in. mm in. mm in. kg lb. CCM For further information please contact Danfoss 10 DKRCI.PD.VK1.A4.02 / 520H7650 Danfoss A/S (AC-MCI sw)
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