Danfoss CCM is an electrically operated valve designed specifically for CO₂ refrigeration systems. It can function as an expansion valve or as a gas bypass valve with back-pressure regulation in subcritical applications.
CCM valves are used in CO₂ refrigeration systems where precise pressure and flow control are required, including transcritical CO₂ booster systems, CO₂/CO₂ cascade systems, and CO₂ evaporator applications. The valve supports high working pressures, precise positioning, and bi-flow operation.
What is the Danfoss CCM valve used for?
The Danfoss CCM valve is used for precise control in CO₂ refrigeration systems. It can be applied as a gas bypass valve to regulate intermediate pressure in transcritical CO₂ booster systems, or as a liquid expansion valve for injection in plate heat exchangers and CO₂ evaporators.
In gas bypass applications, CCM helps regulate intermediate pressure by venting flash gas generated after transcritical expansion. In liquid expansion applications, CCM meters CO₂ into heat exchangers or evaporators for accurate refrigerant flow control.
Key features of Danfoss CCM valves
| Feature | Benefit |
|---|---|
| Designed for CO₂ systems | Suitable for R744 applications where high pressure and precise control are required. |
| Up to 90 bar working pressure | Supports CO₂ system pressures during standstill conditions. |
| MOPD up to 50 bar | Supports operation under high differential pressure conditions. |
| Precise positioning | Enables accurate control of intermediate pressure or liquid injection. |
| Bi-flow operation | Supports flow in both directions where the application requires it. |
| Stainless steel butt weld / solder connections | Supports installation in copper-piped systems, including K65 alloy or standard copper, as well as steel-piped systems. |
| IP67 motor enclosure | Provides protection for the valve actuator in demanding refrigeration environments. |
Technical data
| Parameter | CCM |
|---|---|
| Refrigerant compatibility | R744 / CO₂ |
| MOPD | 50 bar / 725 psi |
| Maximum working pressure | 90 bar / 1305 psi |
| Refrigerant temperature range | -40°C to 40°C / -40°F to 104°F |
| Ambient temperature range | -40°C to 60°C / -40°F to 140°F |
| Total stroke | 13 mm / 16 mm |
| Motor enclosure | IP67 |
Electrical data
| Parameter | CCM |
|---|---|
| Stepper motor type | Bi-polar permanent magnet |
| Step mode | 2-phase full step |
| Phase resistance | 52 Ω ±10% |
| Phase inductance | 85 mH |
| Holding current | Depends on application |
| Step angle | 7.5° motor / 0.9° lead screw |
| Nominal voltage | 12 V DC |
| Phase current with chopper drive | 100 mA RMS |
| Maximum total power | 5.5 W / 1.3 W |
| Electrical connection | 4-wire cable, 0.5 mm², 0.3 m long |
How does the CCM valve operate?
The CCM valve is operated by a stepper motor that provides precise valve positioning. The valve can be opened or closed in controlled steps, allowing the refrigeration system to regulate pressure or refrigerant flow according to application demand.
The valve design includes a cable, glass seal, motor housing, stepper motor, bearing, spindle, insert, valve piston, valve seat, and valve port. This design supports controlled movement of the valve piston and accurate regulation through the valve port.
Gas bypass application in transcritical CO₂ systems
In a transcritical CO₂ booster system, CCM can be used as a gas bypass valve to regulate intermediate pressure. The valve vents flash gas generated after transcritical expansion, helping keep pressure at a safe level for components located in the liquid lines of a transcritical CO₂ system.
For gas bypass applications, Danfoss recommends using the CCM valve with the EKC 326A controller.
Liquid expansion application in CO₂ systems
CCM can also be used as a liquid expansion valve for injection in plate heat exchangers in CO₂/CO₂ cascade systems or as an expansion valve for CO₂ evaporators.
For liquid injection applications, Danfoss recommends using CCM with the EKC 316A controller.
Where can CCM valves be used?
| Application | How CCM is used |
|---|---|
| Transcritical CO₂ booster systems | Gas bypass valve for intermediate pressure regulation. |
| Subcritical CO₂ applications | Gas bypass valve with back-pressure regulation. |
| CO₂/CO₂ cascade systems | Liquid expansion valve for injection in plate heat exchangers. |
| CO₂ evaporators | Expansion valve for controlled refrigerant injection. |
Sizing and capacity guidance
CCM valve capacities are available for gas bypass and liquid expansion applications with R744 / CO₂ as the refrigerant. Capacity depends on the selected valve size, application type, pressure conditions, evaporating temperature, and pressure drop.
If the capacity shown in the capacity table is less than 75% of the required capacity, select one valve size larger or use an additional valve in parallel.
Gas bypass sizing guidance
Gas bypass capacities are based on the amount of flash gas produced when expanding from supercritical CO₂ before the transcritical expansion valve. The brochure bases this on 35°C and the corresponding optimal high-pressure setting of 89 bar, as set by the Danfoss EKC 326A controller.
The capacity tables show total system evaporating capacity at the given evaporating temperature.
Liquid expansion sizing guidance
Liquid expansion valve capacities are provided for different evaporating temperatures and pressure drops across the valve. The values are based on 0.1 K liquid subcooling at the inlet to the valve and no useful superheat.
For other subcooling levels, the capacity can be adjusted by multiplying the table value by the appropriate capacity correction factor.
CCM valve range and ordering information
| Type | Weld connection | Solder ODF connection | Code number |
|---|---|---|---|
| CCM 10 | 1/2 x 1/2 in | 5/8 x 5/8 in | 027H7188 |
| CCM 20 | 3/4 x 3/4 in | 7/8 x 7/8 in | 027H7187 |
| CCM 30 | 1 x 1 in | 1 1/8 x 1 1/8 in | 027H7186 |
| CCM 40 | 1 x 1 in | 1 1/8 x 1 1/8 in | 027H7185 |
Spare parts and accessories
| Item | Code number |
|---|---|
| CCM CO₂ valve actuator | 027H7184 |
| Wire 4 x 0.5 x 8000 mm with M12 female connector | 034G2323 |
| AST-G driver manual box for operating the valve | 034G0013 |
FAQ
What is the Danfoss CCM valve?
- The Danfoss CCM valve is an electrically operated valve designed for CO₂ refrigeration systems. It can operate as an expansion valve or as a gas bypass valve with back-pressure regulation.
Which refrigerant is the CCM valve compatible with?
- The CCM valve is compatible with R744 / CO₂.
What is the maximum working pressure of the CCM valve?
- The CCM valve has a maximum working pressure of 90 bar / 1305 psi.
What is the MOPD of the CCM valve?
- The CCM valve has a maximum operating pressure differential of 50 bar / 725 psi.
Can CCM be used as a gas bypass valve?
- Yes. CCM can be used as a gas bypass valve in transcritical CO₂ booster systems to regulate intermediate pressure.
Can CCM be used as an expansion valve?
- Yes. CCM can be used as a liquid expansion valve for injection in plate heat exchangers in CO₂/CO₂ cascade systems or as an expansion valve for CO₂ evaporators.
Which controller is recommended for gas bypass applications?
- For gas bypass applications, the EKC 326A controller is recommended.
Which controller is recommended for liquid injection applications?
- For liquid injection applications, the EKC 316A controller is recommended.
What should I do if the valve capacity is below the required capacity?
- If the capacity shown in the capacity table is less than 75% of the required capacity, select one valve size larger or use an additional valve in parallel.
Which CCM valve sizes are available?
- The CCM range includes CCM 10, CCM 20, CCM 30, and CCM 40.
Which expansion valves work with CO₂?
- Only expansion valves designed for CO₂ can be used with CO₂ due to the higher working pressures of a CO₂ system.
Which thermostatic expansion valve works for CO₂ cold rooms?
- Danfoss has a specialy designed TE2 thermostatic expansion valve to work with CO₂.
Downloads
This page summarizes the key product information from the Danfoss CCM technical brochure. Download the full PDF for detailed capacity tables, valve operation diagrams, dimensions, and complete ordering information.