Danfoss ICLX 32 Installation Manual page 5

ENGLISH
Often the cover and function module can be
removed while still assembled (fig. 3a), but if
the internal O-rings stick to the metal surface
it is necessary to disassemble in 2 steps
(fig. 3b). In both cases the parts can be lifted
out by the careful use of 2 screwdrivers.
Upon opening and removal of the function
module:
- Check that the o-rings on the function
module has not been damaged.
A valve with a damaged o-ring might not
operate according to the specification.
- The insert and piston assembly can be
disassembled according to figure 8b & 8c.
Be careful when removing the retaining
ring (fig. 8b, pos. 6). The retaining ring (fig.
8b, pos. 6) will be submitted to the force
from the compressed spring (fig. 8b, pos. 4).
Be careful not to damage the two
Seal Seats shown in fig. 8b and 8c
since any deformation of the steel
surface will lead to malfunction of
the valve.
- Check pistons, cylinders and valve plates
for wear and scratches and replace if
needed.
- Check that the movement of the pistons
and valve seats are free and with low
friction.
Replacement of Valve Plates
(ordinary wear parts)
It is possible to replace the two PTFE valve
plates (fig. 8c, pos. 2 and pos. 5) by following
fig. 9 and these instructions:
Fig. 9a, pos.1 shows a hexagon profile (tool)
that fits into the female hexagon hole in
the sealing retainer (pos. 3) of the piston
assembly of ICLX 50 – 65.
For ICLX 32 – 40 the corresponding tool has
to be a hollow hexagon to fit onto the male
hexagon.
As backstop when unscrewing the sealing
retainer it is recommended to make an
arrangement of two steel pins that fits into
the small female hexagon holes of the Allen
bolts (fig. 8c, pos. 9), clamped into a vice (fig.
9a, pos. 2).
Once the sealing retainer is removed, the
Valve plate (pos. 4) can be lifted out.
Move the two steel pins (fig. 9b, pos. 2) to a
higher position in the vice to allow the bleed
piston (fig. 9b, pos. 3) to be slided downwards
and expose a ring of holes (pos. 4).
While there is access to the holes (pos. 4) a
steel pin (pos. 5) with matching diameter is
inserted through two opposed holes with
tool pos. 1 (or similar punched tool) in the
middle.
Unscrew the main piston (fig. 9b, pos. 6).
For disassembling of the last sealing retainer
it is recommended to utilise a mandrel with
three point suspension to avoid deformation
of the surfaces (fig. 9c).
Clamp the bleed piston carefully to the
mandrel at surface pos.1. Block the mandrel
from rotation and unscrew the sealing
retainer with a tool (pos. 2) manufactured for
the purpose.
© Danfoss | DCS (MWA) | 2016.12
When the sealing retainer is removed
the remaining valve plate (pos. 3) can be
replaced.
Reassembling of the piston assembly is done
in reverse order. The torque values for the
different joints are shown in fig. 9.
Assembly
Remove any dirt from the body before the
valve is assembled. Check that all channels
in the valve are not blocked by particles or
similar.
If possible, apply some refrigeration oil to ease
the insertion and to protect the o-rings.
Tightening (fig. 6)
Tighten the top cover with a torque wrench, to
the values indicated in the table.
Changing from two step to
one step function
The ICLX valve is from factory side setup as
two step function. To change the opening
characteristics to one step function the
following step must be completed:
- Remove the topcover from the valve
housing (fig. 3).
– Change the two bolts (fig. 8c, pos. 9), with
insert still in the valve housing.
- The length of the two bolts corresponds
to the desired characteristic of the valve
and should be applied according to the
table (fig. 4).
- After changing the bolts the valve can be
reassembled.
Manual opening device (fig. 7)
Normal operation mode
For the valve to operate normally under the
influence of the pilot valves the spindle of the
manual operation device needs to be turned
fully clockwise until the locking ring (A) sits
on the top of the packing gland.
Manual forced opening
To manually open the valve the spindle of the
manual operation device needs to be turned
fully counter clockwise until hitting the
mechanical stop.
Commissioning
The time span required to secure full closing
of the ICLX valve depends on valve size and
application, and needs to be investigated
on site. The optimum should be determined
during commissioning.
Use only original Danfoss parts, including
O-rings and gaskets for replacement.
Materials of new parts are certified for the
relevant refrigerant.
In cases of doubt, please contact Danfoss.
Drawings are only for illustration, not for
dimensioning or construction.
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