Danfoss ICSX Data sheet
Data Sheet
Hot gas powered on/off 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.
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Hot gas powered on/o 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 teon valve seat
• Manual opening
• The top cover can be rotated into any possible position without aecting the operation of the valve
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Body
Pilot channel to inlet side
Circular gap between house and module
Top cover
Piston top inlet channel
External pilot connection hole
Pressure gauge connection
Circular groove
Function module
Cylinder
Piston
Valve plate
Spring
Cone
Piston rod
Inlet pressure
Pressure on piston
Pressure underneath piston
Outlet pressure
Manual operating spindle
Hot gas powered on/o valve, type ICSX
Functions
Figure 1: ICSX hot gas powered on/o valve
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NNC, energized/open
Activating coil
O, energized/closed
Pressure relief coil
ICSX open
NC, energized/opens prior to ICSX opening
Soft opening coil
NNC, deenergized/closed
Activating coil
NC, deenergized/closed
Soft opening coil
O
, deenergized/open
Pressure relief coil
ICSX closed
hole
ICS
Hot gas powered on/o valve, type ICSX
Figure 2: ICSX hot gas powered on/o valve
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
Figure 4: ICSX closed
Solenoid NC external gas power deenergized, closed
Solenoid NO drain deenergized, open
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 dierential (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 dierential pressure loss.
Though Pd is kept low, it can still be quantied, 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.
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Hot gas powered on/o 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 dierential 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.
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Hot gas powered on/o 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.
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