Danfoss ICSX Data sheet

Data Sheet

Hot gas powered on/o valve

Type ICSX

For HFC/HCFC hot gas defrost application

ICSX hot gas powered on/o€ valve belongs to the ICV (Industrial Control Valve) family but it is dedicated designed for HFC/HCFC systems.

ICSX hot gas powered on/o€ valve is to be used in wet and dry suction lines and in liquid lines without phase change(i.e. where no expansion takes place in the valve) providing ON/OFF function in large refrigeration systems.

The valve comprises four components: valve body, function module, top cover and external pilot connection. However, only function module is with dedicated design, valve body, top cover(with one pilot pressure connection) and external pilot connection are exactly the same as standard pilot operated servo valve ICS.

One NC(normally closed) and one NO(normally open) solenoid valves with one power supply signal are needed to control the ICSX hot gas powered on/o€ valve. For safety purpose, it is strongly recommended to install an additional NC solenoid valve in parallel.

AI404219416371en-000102

Hot gas powered on/off valve, type ICSX

Features

•Applicable to HCFC, HFC

•Modular Concept

•Fast and easy valve overhaul service

•Low pressure drop

•Designed to ensure less hot gas leakage

•Max. working pressure: 52 bar(754 psig)

•Temperature range: -60 °C to +120 °C (-76 °F to + 248 °F)

•Exact capacity and setting of the valve can be calculated for all refrigerants by means of Coolselector®2 (Select "ICS external" from the "Product families")

•Low temperature steel body

•Low weight and compact design

•Covering sizes 32 to 80, others out of this range are upon request

•Replaceable te„on valve seat

•Manual opening

•The top cover can be rotated into any possible position without a€ecting the operation of the valve

AI404219416371en-000102 | 2

Hot gas powered on/off valve, type ICSX

Functions

Figure 1: ICSX hot gas powered on/off valve

1	Body

1a	Pilot channel to inlet side

1b	Circular gap between house and module

2	Top cover

2a	Piston top inlet channel

2b	External pilot connection hole

2c	Pressure gauge connection

2d	Circular groove

3	Function module

3a	Cylinder

3b	Piston

3c	Valve plate

3d	Spring

3e	Cone

3f	Piston rod

p1	Inlet pressure

p2	Pressure on piston

p3	Pressure underneath piston

p4	Outlet pressure

8	Manual operating spindle

AI404219416371en-000102 | 3

Hot gas powered on/off valve, type ICSX

Figure 2: ICSX hot gas powered on/off valve

hole

ICS

The function module of ICSX hot gas powered on/o€ valve is with a minor design change on current function module of ICS pilot operated servo valve. The equalization hole in the piston is removed, see Figure 2. However, the top cover and housing are remain the same as current ICS pilot operated serve valve.

NOTE:

There is a risk of trapped cold liquid in the volume above the piston (marked red on Figure 2) and the external pilot connection and system pipes.

Figure 3: ICSX open

Solenoid NC external gas power energized, open Solenoid NO drain energized, closed

NC, energized/open	NO, energized/closed
Activating coil	Pressure relief coil
	ICSX open
NC, energized/opens prior to ICSX opening
	Soft opening coil

Figure 4: ICSX closed

Solenoid NC external gas power deenergized, closed Solenoid NO drain deenergized, open

NC, deenergized/closed	NO, deenergized/open
Activating coil	Pressure relief coil
	ICSX closed
	NC, deenergized/closed
	Soft opening coil

ICSX is a pilot controlled valve used as a open/close valve in suction lines to open with external pressure. This means that the valve can operate with no internal pressure di€erential (Pd) at all and provide a low pressure loss over the valve.

Low Pd is the key objective and makes the ICSX ideal for applications that are sensitive to di€erential pressure loss. Though Pd is kept low, it can still be quanti†ed, and must be considered when choosing valve size. Check in the Coolselector, select "ICS external" from the "Product Families".

To assure a proper opening of the valve, the hot gas inlet pressure must be higher than 0,5 bar above the inlet pressure of the ICSX.

AI404219416371en-000102 | 4

Hot gas powered on/off valve, type ICSX

See Figure 3 and See Figure 4 above, two additional solenoid valves are needed to control the ICSX, pos.1(NC) and pos.2(NO) with one power supply signal. The external pilot pressure line must be connected to a system pressure (p2), and usage of NC and NO solenoid valves ensures that trapped liquid (condensed refrigerant) cannot build up excessive hydraulic pressure due to pressure relief through the NO solenoid valve. Please consider the MOPD of the solenoid valves.

ICSX hot gas powered on/o€ valve is kept open when power is applied to the coils of solenoid valves pos. 1 and pos. 2. It is closing and kept closed when the coils of solenoid valves pos. 1 and pos. 2 are de-energized.

It is strongly recommended to install an additional NC solenoid valve pos.3 in parallel for safety purpose so that soft opening and also high pressure after defrosting is decreased softly. The open period for solenoid valve pos.3 to drain the high pressure from evaporator has to be determined by commissioning. The opening of ICSX main valve might not be done before high pressure of evaporator be drained.

The manual spindle can be used to open the valve. Be aware of, that it might not be 100% opening. Depending on valve size.

NOTE:

The use of stop valves in the pilot lines need to be assessed by a risk assessment according trapped cold liquid. This risk assessment must be carried out by the designer of the plant.

If other automatic controls are used for controlling the hot gas power or other systems to control the hot gas power, a risk assessment according trapped liquid as mentioned above must be carried out by the designer of the plant.

Due to the design of the standard valve as a servo operating main valve controlled by di€erential pressure, the emptying of the volume over the piston (Marked red on Figure 2) might take longer than e.g. an ICLX valve. It might take several minutes when the volume is †lled with condensed refrigerant. This must be considered when designing the defrost sequence, especially in the delay time for opening the hot gas line.

AI404219416371en-000102 | 5

Hot gas powered on/off valve, type ICSX

Application

Typical applications for large refrigeration systems with HFC/HCFC refrigerant, both pump and DX hot gas defrost application.

Figure 5: ICSX Functional diagram

NOTE:

*Choose ICS+EVRST in EKE 400 and the NC and NO solenoid valves should be connected together.

AI404219416371en-000102 | 6

+ 12 hidden pages