2
DKRCI.PI.FN1.C3.ML / 520H8211
© Danfoss | DCS (MWA) | 2015.05
ENGLISH
Refrigerants
Applicable to HCFC, HFC, R717 (Ammonia),
R744 (CO
2
) and all flammable refrigerants.
The strainer is only recommended for use
in closed circuits. For further information
please contact your local Danfoss sales
office.
Pressure and temperature range
–60/+150°C (–76/+302°F)
FIA SS 15-65:
The strainers are designed for a max.
working pressure of 52 bar (754 psi g)
Installation
Note:
At delivery the strainer housing
is not equipped with strainer
element 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 element 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
To prevent damage to the gasket between
the strainer body and top cover, the top
cover should be removed before welding
and protect it from dirt and moisture (fig.
2).
Only materials and welding methods,
compatible with the valve housing
material, must be welded to the valve
housing.
Clean the strainer housing internally to
remove welding debris at completion
of welding and before the valve is
reassembled.
Removing the top cover can be omitted
provided that:
The temperature in the area between the
valve body and top cover during welding
does not 150°C/+302°F.
This temperature depends on the welding
method as well as on any cooling of the
strainer body during the welding itself.
(Cooling can be ensured by, for example,
wrapping a wet cloth around the strainer
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.
Assembly
Remove welding debris and any dirt from
pipes and strainer body before assembly.
Check that the strainer element has
the right size before it is inserted in the
top cover and check that the gasket is
undamaged.
Place the strainer element (pos. D) from
underneath. The element 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. 3).
Please note that the table (fig. 3)
containing maximum torque must be
adhered to and never exceeded.
If the drain valve has been chosen as
accessory, the drain plug should be
replaced by the drain valve.
Colours and identification
The FIA SS valves are painted with a
red oxide primer in the factory. Precise
identification of the valve is made via the
ID plate on the top cover, as well as by the
stamping on the valve body. The external
surface of the valve 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 valve.
Maintenance
Mounting of accessory:
Strainer bag (fig. 4)
A 50µ strainer bag (pos. E), especially for
commissioning of the plant, can replace
the normal strainer element.
Mount the strainer bag (held in place by
the strainer holder) and be sure to place
the strainer bag correctly in the strainer as
shown in fig. 4.
The flow must go into the strainer bag
cavity and out or else the bag will not
function properly.
Dismantling the strainer (fig. 3)
Before servicing the strainer, isolate it from
the system and remove all refrigerant by
evacuation to zero pressure. Check for
refrigerant pressure before unscrewing and
removal of the top cover.
The strainer element must be removed
without any use of tools
Cleaning
Clean the strainer element using an
appropriate solvent by flushing and
brushing. The use of strong acids cannot be
recommended. The strainer element must
be wiped or blown dry before inspection. If
the element is damaged or the sediments
cannot be removed, the strainer element
must be replaced.
Assembly
Remove any dirt from the body before the
strainer is assembled.
Replacement of gasket
Change the gasket for the top cover (pos.
C) and drain plug.
Check that the strainer element is correctly
placed before remounting the top cover
and bolts (pos. A).
Tightening (fig. 3)
Tighten the top cover bolts (pos. A) with
a torque wrench according to the table in
fig. 3
Use only original Danfoss parts (including
gaskets) for replacement. Materials of
new parts are certified for the relevant
refrigerant.
In cases of doubt, please contact your local
Danfoss sales office.
