Danfoss FIA-140B DN 50-100 Installation guide

Installation guide

Strainer

FIA-140B DN 50-100

148R9662

1 2

Maintenance

148R9662

D

3

Torque range

Bolts A Nm LB-ft
DN 50-65 133 ± 5 98 ± 3.7
DN 80 84 ± 5 62 ± 3.7
DN 100 135 ± 5 100 ± 3.7

Bolt E

All sizes 10* 7.4*

*Pre-tighten + 45 degrees clockwise rotation

© Danfoss | Climate Solutions | 2021.12

D
C

B

A

D

D

C

C

B

B

A

A

F

Info for UK customers only:Danfoss Ltd. Oxford Road, UB9 4LH Denham, UK

AN394632786860en-000101 | 1

ENGLISH

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 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 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.

© Danfoss | Climate Solutions | 2021.12

In cases of doubt, please contact your local Danfoss sales office.

AN394632786860en-000101 | 2