Danfoss FIA-140B DN 50-100 Strainer Installation Guide
- June 3, 2024
- Danfoss
Table of Contents
Danfoss FIA-140B DN 50-100 Strainer
Refrigerants
Applicable to R744 (CO₂). The strainer is only recommended for use in closed circuits. For further information please contact your local Danfoss sales office.
Pressure and temperature range
FIA-140B DN 50-100: The strainers are designed for a max. working ressure of
140 bar (2030 psig) at -40/+150 °C (-40/+302 °F).
Installation
Note: At delivery the strainer housing is not equipped with strainer
insert or accessories.
The strainer must be installed with the top cover downwards, and the flow must
be directed towards the top cover as indicated by the arrow on the strainer
housing (fig. 1). The strainer insert must be inserted after welding
.
The strainer housing is designed to withstand a high internal pressure.
However, the piping system should be designed to avoid liquid traps and reduce
the risk of hydraulic pressure caused by thermal expansion. It must be ensured
that the strainer is protected from pressure transients like “liquid hammer”
in the system.
Recommended flow direction
The strainer must be installed with the flow towards the top cover as
indicated by the arrow on the side of the valve body (fig. 1). Flow in the
opposite direction is not acceptable.
Welding
The top cover should be removed before welding (fig. 2) to prevent damage to
the gasket between the strainer housing and top cover. Only materials and
welding methods compatible with the valve housing material, must be applied to
the valve housing. Clean the strainer housing internally to remove welding
debris at completion of welding and before the strainer is reassembled
.
Removing the top cover can be omitted provided that:
The temperature in the area between the strainer housing and top cover during
welding does not exceed +150 °C/+302 °F. This temperature depends on the
welding method as well as on any cooling of the strainer housing during the
welding itself.
Cooling can be ensured by, for example, wrapping a wet cloth around the filter
body. Make sure that no dirt, welding debris etc. get into the strainer during
the welding procedure.
The strainer housing must be free from stresses (external loads) after
installation.
Strainers must not be mounted in systems where the outlet side of the strainer
is open to atmosphere. The outlet side of the strainer must always be
connected to the system or properly capped off, for example with a welded-on
end plate.
Brazing
When brazing Danfoss recommends Ag40 minimum 450 – 700 °C filler or better
which are suitable for the working pressure shall be used and following
procedure observed (fig. 3):
- Remove top cover/insert
- Clean connections with a cleaning agent
- Wrap around wet cloth
- Apply flux on piping ends
- Apply inert gas internal
- Heat up piping
- Braze with recommended brazing material and within the temperature range specified
- Remove residual flux
Assembly
Remove welding debris and any dirt from pipes and strainer housing before assembly. Check that the strainer insert has the right size before it is inserted in the top cover and check that the gasket is undamaged. Place the strainer insert (pos. D) from underneath. The insert has a slight force fit into the housing, no gaskets or O-rings are used. If magnet inserts have been chosen as accessory, fit those on the top cover before replacing the cover.
Tightening
Tighten the top cover with a torque wrench, to the values indicated in the
table (fig. 4). Please note that the maximum torque stated must not be
exceeded. If the drain valve has been chosen as accessory, the drain plug
should be replaced by the drain valve.
Colors and Identification
The FIA strainers are painted with a green oxide primer in the factory.
Precise identification of the strainer is made via the ID plate on the top
cover, as well as by the stamping on the strainer housing. The external
surface of the strainer housing must be prevented against corrosion with a
suitable protective coating after installation and assembly. Be sure to
protect the ID plate when repainting the strainer.
Maintenance
Mounting of accessory: Filter bag
A 50μ filter bag, especially for commissioning of the plant, can replace the
normal strainer insert.
Mount the filter bag (held in place by the filter holder) and be sure to place
the filter bag correctly in the strainer as shown in pos. F in fig. 5
.
The flow
must go into the filter bag cavity and out or else the bag will not function
properly.
Dismantling the strainer (fig. 4)
Before servicing the strainer, isolate it from the system. Drain CO₂ e.g. via
the top cover connection to above 5,2 bara to prevent large formation of dry
ice before evacuation to zero pressure. Check for refrigerant pressure before
unscrewing and removing the top cover. The strainer insert must be removed
without any use of tools.
Cleaning
Clean the strainer insert using an appropriate solvent by flushing and
brushing. The use of strong acids cannot be recommended. The strainer insert
must be wiped or blown dry before inspection. If the insert is damaged or the
sediments cannot be removed, the strainer insert must be replaced.
Assembly
Remove any dirt from the housing before the strainer is assembled.
Replacement of gasket
Change the gasket for the top cover (pos. C) and drain plug. Check that the
strainer insert is correctly placed before remounting the top cover and bolts
(pos. A).
Tightening (fig. 4)
Tighten the top cover bolts (pos. A) with a torque wrench according to the
table in fig. 4. Check and tighten the purge screw (pos. E) according to the
table in fig. 4. Use only original Danfoss parts (including gaskets) for
replacement. Materials of new parts are certified for the relevant
refrigerant.
Charging
Charge CO₂ gas e.g. via the top cover connection to above 5,2 bara to prevent
large formation of dry ice when charging with CO₂ liquid or equalizing with
system pressure.
In cases of doubt, please contact your local Danfoss sales office.
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