Installation - Danfoss AKS 38 Installation

English
Refrigerants
The AKS 38 can be used for all common
non-flammable refrigerants, including R717
and non-corrosive gases/liquids dependent
on sealing material compatibility.
Flammable hydrocarbons are not
recommended.
Temperature range
–50°C/+65°C (–58°F/149°F)
Pressure range
AKS 38 is designed for a max. working
pressure of 28 bar g (406 psi g)
IMPORTANT
Should pressure testing in excess
of 28 bar g (406 psi g) be necessary
then the internal float assembly must be
removed, thus allowing a maximum test
pressure of 42 bar g (609 psi g)
Electrical data
- Change-over Micro (SPDT) switch
- 250 V a.c / 10 A
- 30 V d.c / 5 A
- DIN Plug
- DIN 43650 connection
- PG 11, 8-10 mm (0.31" - 0.39")
- Screw terminal 1.5 mm
2
- 3+PE
Liquid level differential
Variable between 12.5 mm to 50 mm
(½" to 2") in 12.5 mm (½") increments.
Required differential setting should be made
prior to installation.
Factory set at 50 mm (2").
Enclosure
IP 65

Installation

IMPORTANT
AKS 38 must always be installed in
a vertical position (fig. 1 and 2).
AKS 38 is supplied complete with flanges
(fig 2, pos. 14). The external surfaces of
the flanges must be prevented against
corrosion with a suitable protective coat after
installation.
To avoid an oil seal forming which would
affect the movement of the internal float the
bottom connecting pipe must have an incline
towards the liquid separator.
Shut-off valves should be mounted as close
as possible to the float for service (fig. 1).
Switch point
The switch point is relative to the actual liquid
level marking on the AKS 38 housing. See
fig 7.
The upper switch point is actually (D : 2)
higher than the actual liquid level marking.
DIR
The lower switch point is actually (D : 2)
lower than the actual liquid level marking.
Where D = differential.
Adjusting the liquid level differential
switch point (see fig. 9)
The float comes factory set with a differential
setting of 50 mm (2") with the lower locking
ring C in position b. To acheive smaller
differential settings reposition the lower
locking ring C at b
(b = 25 mm (1"); b
2
The upper locking ring D in position a
should not be adjusted or repositioned.
IMPORTANT
The adjustment must be made
before AKS 38 is installed in the
refrigeration system. Use two thumbs for
repositioning the locking rings. Do not
use any tools.
Remove the AKS 38 switch box (fig. 3, pos. 2).
• Unfasten the M4 × 8 (fig. 3, pos. 3) pinol
tailstock screw with a Allen key.
• Remove the switch box by slowly easing
upwards.
Remove the AKS 38 housing top cover
(fig. 3, pos. 4).
• Unfasten the 4 × M12 × 35 stainless steel
(16 AWG)
bolts (fig. 3, pos. 5).
• Remove the complete top cover including
installed pressure tube (fig. 3, pos. 7).
Remove the complete float assembly
(fig.3, pos. 1 and fig. 4, pos. 1) from the
AKS 38 housing (fig. 3, pos. 6).
• Reposition the lower locking ring at the
required differential setting.
• See fig. 8 and fig. 9.
Reassembly
• Refit the float assembly back into the
AKS 38 housing (fig. 3, pos. 6).
• Reinstall the complete top cover
(fig. 3, pos. 4) and fasten the 4 × M12 × 35
bolts (fig. 3, pos. 5).
Max. tightening torque: 74 Nm (100 ft-lb).
• Reinstall the switch box (fig. 3, pos. 2) by
slowly forcing it down over the pressure
tube (fig. 3, pos. 7).
• Position the switch box (fig. 3, pos. 2) as
required and fasten the M4 × 8 pinol
tailstock screw (fig. 3, pos. 3) with a Allen
key.
Electrical installation
Make electrical connection to DIN plug using
cable with maximum 4 cores and wire in
accordance with wiring diagram (fig. 8).
1. Common
2. Normally Closed
3. Normally Open
Earth terminal
RI5MA367 © Danfoss A/S (RC-CMS / MWA), 10 - 2004
Replacing the internal float assembly
(fig. 3, pos.1)
• Unscrew the stainless steel bolts
= 37.5 mm (1½"); • Remove the top cover (fig. 3, pos. 4)
1
= 12.5 mm (½").
3
• Remove the internal float assembly
• Install the new float assembly.
Replacing the flange gaskets
(fig. 2, pos. 15)
• Unscrew the 4 × M12×35 stainless steel
• Unscrew the 4 × M12×35 stainless steel
• Remove both gaskets (fig. 2, pos. 14).
• Install the new gaskets.
• Fasten 4 × M12×35 stainless steel bolts in
Replacing the top cover gasket
(fig. 3, pos. 8)
• Unscrew the 4 × M12×x35 stainless steel
• Remove the top cover (fig. 3, pos. 4)
• Remove the gasket (fig. 3, pos. 8).
• Install the new gasket.
• Fasten 4 × M12×35 stainless steel
Replacing the aluminium gasket
(fig. 3, pos. 11)
• Unscrew the M4 × 8 pinol tailstock screw
• Remove the switch box (fig. 3, pos. 2) by
• Unscrew the pressure tube (fig. 3, pos. 7)
• Remove the aluminium gasket
• Install the new gasket.
• Reinstall the pressure tube.
• Reinstall the switch box.
Replacing the switchbox (fig. 3, pos 2)
• Remove the DIN-plug (fig. 6).
• Unscrew the M4 × 8 pinol tailstock screw
• Remove the switch box (fig. 3, pos. 2) by
• Install the new switch box.
Replacing the O-ring at the pressure tube
(fig. 3, pos. 9)
• Unscrew the M4 × 8 pinol tailstock screw
• Remove the switch box (fig. 3, pos. 2) by
• Remove the O-ring.
• Install the new O-ring.
• Reinstall the switch box.
Maintenance
IMPORTANT
The AKS 38 must be evacuated
before opening to air.
4 × M12×35 (fig. 3, pos. 5).
including installed pressure tube
(fig. 3, pos. 7) and switch box (fig. 3, pos. 2).
(fig 3, pos. 1).
bolts on the side flange (fig. 2, pos. 13).
bolts on the bottom flange (fig. 2, pos. 13).
each flange. Max. tightening torque: 74 Nm
(100 ft-lb).
bolts (fig. 3, pos. 5).
including installed pressure tube (fig. 3,
pos. 7) and switch box (fig. 3, pos. 2).
bolts (fig. 3, pos. 5).
Max. tightening torque: 74 Nm (100 ft-lb).
(fig. 3, pos. 3) with a Allen key.
slowly easing upwards.
with a 32 mm wrench.
(fig. 3, pos. 11).
(fig. 3, pos. 3) with a Allen key.
slowly easing upwards.
(fig. 3, pos. 3) with a Allen key.
slowly easing upwards.
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