Motor Operated Valve

Introduction

The ICMTS 50/80 is a motor-operated valve specifically designed for high pressure R744 applications. It is recommended for use in closed circuits. For further information, please contact Danfoss.

Specifications

Refrigerants

The valve is specifically designed for high pressure R744 applications and is recommended for use in closed circuits. For further information, please contact Danfoss.

Temperature Range

• Allowable TS: -60/+150 °C (-76/+302 °F)
• Operation: -40/+50 °C (-40/+122 °F)
• Ambient: -30/+50 °C (-22/+122 °F)

In systems with continuous media temperatures above +50 °C (+122 °F), Danfoss recommends inspecting the valve annually and replacing the PTFE valve seat if needed.

Pressure

The valves are designed for a maximum working pressure of 140 bar (2030 psig).

Function

The ICMTS is a balanced valve that maintains its position; the return function must be provided by the actuator. It can be used in suction, liquid, hot gas, and liquid/vapour lines. The ICMTS regulates flow by modulation or on/off function, depending on the control impulse to the actuator. It is designed for use with the ICAD 600A-TS actuator from Danfoss, ensuring compatibility with Danfoss controllers and other systems like PLC controllers. A control signal activates the ICAD 600A-TS motor, which rotates the spindle in the ICMTS via a magnetic coupling to change the cone opening degree.

Valve Sizes

• ICMTS 50-A (Kv: 9.0 m³/h)
• ICMTS 80-A (Kv: 18 m³/h)
• ICMTS 80-B (Kv: 27 m³/h)

Installation

General Mounting

The ICMTS + ICAD 600A-TS can be installed in pipelines with the actuator pointing upwards (as shown in fig. 1) or at a 45° angle to vertical up. The motor can be mounted in any position before locking it with the 3 Allen screws (fig. 6, pos. 2).

Valve Orientation and System Considerations

The ICMTS valve must be installed with the arrow indicating the direction of flow (fig. 5, fig. 7). When installing, ensure refrigerant does not escape and dirt does not enter the valve. The valve is designed to withstand high internal pressure, but the piping system should avoid liquid traps and reduce the risk of hydraulic pressure caused by thermal expansion. It must be ensured that the valve is protected from pressure transients like "liquid hammer" in the system.

ICMTS valves must not be mounted in systems where the outlet side of the valve is open to atmosphere. The outlet side must always be connected to the system or properly capped off, such as with a welded-on end plate.

Welding or Brazing

Preparation

The top cover, complete with function module, should be removed before welding or brazing to prevent damage to O-rings and PTFE in the function module, and to avoid welding debris entering the module. Be careful not to damage sealings and sealing surfaces, and ensure the complete bonnet is protected from dirt and water while removed. The internal surfaces and weld connections have an anti-corrosion treatment. To maintain its effectiveness, it is important to disassemble the valve just prior to welding/brazing. If function modules are left disassembled for an extended period, protect them by placing them in a polyethylene bag or applying a rust protection agent (e.g., refrigeration oil) on the surfaces.

Procedure

Only materials and welding methods compatible with the valve body material must be applied. The valve should be cleaned internally to remove welding debris on completion of welding and before reassembly. Avoid welding debris and dirt in the valve body and function module. The valve body must be free from stresses (external loads) after installation.

Brazing Specifics

When brazing, Danfoss recommends using Ag40 minimum 450-700 °C filler or better, which is suitable for the working pressure. Follow the observed procedure (fig. 4):

1. Remove top cover/insert.
2. Clean connections with a cleaning agent.
3. Wrap around wet cloth.
4. Apply flux on piping ends.
5. Apply inert gas internally.
6. Heat up piping.
7. Braze with recommended brazing material and within the specified temperature range.
8. Remove residual flux.

Manual Operation

Manual operation can be performed using a magnetic coupling to rotate the spindle manually if the actuator has been removed. A multi-function tool (optional, code 027H0181) is used for this purpose (see fig. 7). Manual operation is also possible with the actuator mounted and powered. If signal connections are wired, the actuator's built-in function allows manual operation in 1% increments (100 steps for a fully open valve). Refer to the separate instruction manual for the ICAD actuator for details on this function.

Insulation

Insulating the valve and its actuator is only necessary if energy considerations in the plant require it. For the function of the ICMTS + ICAD 600A-TS, no insulation is necessary when kept within the specified temperature limits.

Surface Treatment and Identification

The ICMTS valves are factory surface-treated. If further corrosion protection is required, the valves can be painted. Note: The magnet coupling must be protected. Precise identification of the valve is made via the ID plate. After welding, the external surface around the connections of the valve body must be protected against corrosion with a suitable coating. When repainting the valve, it is recommended to protect the ID plate.

Assembly and Tightening

Assembly

Remove welding debris and any dirt from pipes and valve body before assembly. Use the manual magnetic tool (fig. 7) to achieve rotation through the top. A small amount of refrigeration oil on both O-rings can make the insert easier to install into the valve body.

Tightening

Tighten the bonnet with a torque wrench to the values indicated in the table (fig. 2). Please note that the maximum torque values in the table must be adhered to and never exceeded.

Torque Values for Installation (fig. 2):

ICAD 600-TS Configuration

To work with ICMTS 50/80, the ICAD parameter i26 Valve configuration shall be set to 3 (ICM 32).

Maintenance

Service

A precise service schedule cannot be given as service intervals depend on operating conditions, such as how often the valve operates and the amount of impurities and dirt in the system. The ICMTS valves are easy to dismantle, and all parts inside can be replaced by changing the function module. Do not open the valve while it is still under pressure. Be aware that the valve can be under pressure from both sides; the manual magnet tool (fig. 7) can be used to open the seat to equalize pressure internally before removing the top cover.

Before servicing, isolate the valve from the system. Drain CO2 liquid to above 5.2 bar to prevent large formation of dry ice before evacuation to zero pressure. Check for refrigerant pressure before unscrewing and removing the top cover. If the flat gasket (fig. 6, pos. 1) or the O-ring sealing (fig. 6, pos. 3) has been damaged, it must be replaced using the ICMTS inspection kit.

Replacement of the Function Module

Remove the old module. Oil the O-rings (fig. 6, pos. 3 & 4) on the new module with a small amount of refrigeration oil. The spindle inside the valve must not be greased or oiled (fig. 5).

Repair of the Function Module

The ICMTS 50/80 seat PTFE sealing can be replaced using a Danfoss repair kit.

Repair Steps:

1. Unscrew the 4 M4 Allen screws (fig. 8).
2. Fasten the cylindrical assembly lower part in a vise at the flat surfaces and unscrew the upper part with a wrench at the flat surfaces (fig. 8, pos. 1 & fig. 9).
3. Disassemble the assembly into two parts (fig. 10).
4. Replace the PTFE sealing with the one from the repair kit (fig. 10, pos. 1).
5. Reassemble the 2 parts and tighten the assembly using a vise and wrench to the torque indicated in fig. 11.
6. Clean and reassemble the entire insert with the 4 M4 Allen screws tightened to 5 Nm (3.7 lb-feet) (fig. 12).
7. Add refrigeration oil to the new O-ring and replace the O-ring (fig. 12, pos. 1).
8. Replace the Flat gasket (fig. 6, pos. 1) and assemble the valve to the torque indicated in fig. 2.

The piston is not subject for replacement, but it may be cleaned, including the Ø2.5 mm equalization hole. The spindle inside the valve must not be greased or oiled (fig. 5). In case the piston has been damaged, the entire top module shall be replaced.

When charging CO2, ensure the pressure is above 5.2 bar to prevent large formation of dry ice when charging with CO2 liquid or equalizing with system pressure.

Use only original Danfoss parts, including O-rings and gaskets for replacement. Materials of new parts are certified for the relevant refrigerant. In cases of doubt, please contact Danfoss. Drawings are only for illustration, not for dimensioning or construction. Danfoss accepts no responsibility for errors and omissions. Danfoss Industrial Refrigeration reserves the right to make changes to products and specifications without prior notice.

Torque Values for Maintenance/Assembly (fig. 11):