Electric regulating valve
Type CCMT 2, 8, 16 and 42
One valve, 4 applications: HPV, GBV, EV and EPR
The CCMT is an electrically operated valve
designed specically for operation in CO
systems.
The CCMT valve concept is designed to full
global refrigeration requirements.
The valve is capable of functioning either as an
expansion valve, as a pressure regulator for the
gascooler or as a gas bypass valve with backpressure regulation in transcritical or subcritical
applications.
2
Features:
• Designed for CO2 systems with maximum
working pressure of 140 bar / 2030 psig.
• Applicable to R744 (CO2) and other common
refrigerants. The CCMT is compatible with the
oil types PAG, POE and PVE.
• Regulating cone ensures optimum regulating
accuracy, particularly at part load.
• Patented cone and balance design.
• The PEEK seat provides excellent valve
tightness and robustness.
• Combined butt weld and solder connections.
• Top part with built-in strainer / lter.
• MOPD up to 90 bar / 1305 psi
• CCMT 16 – CCMT 42 is available with or
without integrated pressure transmitter.
• Standard M12 connector for simple and
exible connection to the motor driver.
• Low weight and compact design.
• Easy to service. Insert easily taken out by
removing top part.
• For manual operation and service of the
CCMT an AST-g service driver is available.
AI230186439989en-000901
Type
Description
Single pack
Code no.
AK-XM 208C
Stepper output module
1
080Z0023
EKE 1 Series
Superheat controller / driver
1
080G5300
080G5350
080G5400
AST-G
Manual service driver1034G0013
Superheat controller / driver, type
EKE 1 series
Electronic controller type EKC 326
and EKC 313
Electronic driver type AK-XM 208C
Temperature sensors type AKS and
pressure transmitters type MBS
Electric regulating valve, type CCMT 2, 8, 16 and 42
Electric regulating valve, type CCMT 2, 8, 16 and 42
Applications
The CCMT valve is developed for transcritical CO2 applications. The CCMT valve can be used in systems with ash gas
bypass, parallel compression as well as in stand-alone applications.
The CCMT valve can be used in transcritical and subcritical conditions.
CCMT valves are typically used as ash gas bypass and high pressure regulation.
Figure 1: Application
Application 1 - High Pressure Valve (HPV)
The function of the high pressure valve is to control the high pressure in the system according to the reference from
the controller. The reference can be set to obtain the optimum COP, optimum capacity or any other factors. Pressure
optimization is performed by the CCMT valve, which is installed at the outlet of the gas cooler (see the gure above)
and a matching Danfoss controller. This design provides the possibility to optimize gas cooler pressure in all
situations and intermediate receiver pressure independently. Please refer to the www.danfoss.com/CO2 for more
information on CO2 systems.
Application 2 - Gas bypass Valve (GBV)
A gas bypass valve is typically used to regulate the intermediate pressure in a transcritical CO2 refrigeration system,
in order to keep the intermediate pressure low. By venting ash gas generated through a gas bypass valve to the
suction side of the compressor after the transcritcal expansion, the pressure can be kept at a safe level for all
components situated in the liquid lines of a transcritical CO2 system . The two phase mixture from the CCMT valve
has to be separated before gas enters the gas bypass. For use in the gas bypass applicaton the EKC 326A controller is
recommended for CCMT 2 to CCMT 8
Application 3- Expansion Valve (EV)
A liquid expansion valve is typically used for injection in plate heat exchangers of CO2/CO2 cascades, or as an
expansion valve for CO2 evaporators. For the liquid injection applications CCMT 2 to CCMT 8 is used with EKC 313
controller.
Application 4 – Electric pressure regulator (EPR)
With CCMT valves, it is possible to obtain an accurate temperature or pressure control by modulating the pressure in
the evaporator.
Electric regulating valve, type CCMT 2, 8, 16 and 42
Stepper motor switch sequence
Table 6: Stepper motor switch sequence
Table 7: Danfoss cable connections
Figure 2: CCMT valve
If the controller driving the CCMT Light valve is from another manufacturer than Danfoss or a custom design, the
following points must be considered in order to overcome potential step loss.
To ensure total closing of the valve, and to compensate the lost steps after a dened number of changes in opening
degree. the controller should have a function to overdrive the valve in the closing direction. It is recommended to
overdrive ten percent of the full steps range at appropriate intervals.
WARNING:
At power failure the CCMT Light valve will remain in the actual opening position it has at the moment of power
failure, unless a safety device in the form of a battery backup is installed.
Electric regulating valve, type CCMT 2, 8, 16 and 42
M12 angle cable
M12 angle cable
M12 angle female connector is intended for use with the standard M12 male connector on CCMT Light valves.
The Danfoss cable is designed to oer high exibility and proper tensile strength.
The Danfoss M12 cable also consists of paired, twisted wires, which decreases mutual inuence between signals
transmitted
along the cable and reduces inuence of external sources of interference. The cable thus provides a higher degree
of protection
against lost steps compared to other cables.
Electric regulating valve, type CCMT 2, 8, 16 and 42
Certicates, declarations, and approvals
The list contains all certicates, declarations, and approvals for this product type. Individual code number may have
some or all of these approvals, and certain local approvals may not appear on the list.
Some approvals may change over time. You can check the most current status at danfoss.com or contact your local
Danfoss representative if you have any questions.
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