outpu� shaft
potentiometer (optional)
terminal strip
1-/---'==.ir-i+--, ot potentîometer
terminal strip of
electric motor and
micro switches
--+++--,-ii:-+--extra micro switch
nr==r,=î:S:;��ITTITT
and cam (optional)
FIG. 3.8A SUPPLEMENT$ FOR ELECTRIC
SLICE VALVE ACTUATOR
and cams respectively. These micro switch and cam com
blnations can be used for any switch purpose in the instal
lation in dependence on the actuaJ (part-laad) capacity of
the compressor in question.
- Only one extra micro switch
in
combination with a poten
tiometer (see fig.
3.8A).
The potentiometer is usèd tor
remote electric indïcation (analog or digital read-out) of
the position of any part of the capacity control mechanism
or the corresponding actual refrigeratîng capacity. lt is
mounted on the free end of the cam post instead of the
pointer plus scale.
So, in this case the standard "mechanica!" indicator is not
available any more.
ELECTRIC WIRING
Inside the housing (10) in fig. 3.7 Aa terminal strip is fitted,
which is factory wired to the standard limit switches and ad
justing motor. Fig. 3.88 shows this terminal strip and the in
ternal electric wîring diagram. In principle aJI external wiring
remains to be carried out by the installer in the field. Only in
case the package is provided with a control cabinet all the
electric wiring has been done by the manufacturer accord
ing to the wiring diagram in Paragraph 3.6.
3.5 INSTRUMENTS AND SAFETY OEVICES
The standard compressor package is equipped with a num
ber of
in.,c:truments and safety devices as shown in
the
flow
diagrams of figures 3.2 to 3.5. Their purpose is to check the
correct operation of the package according to the system
design conditions and to protect the compressor and pack
age against malfuncUoning or even breakdown it some
where abnormal operating conditions arïse.
extemal
actuator wiring
wiring
�----t-1 001----------,
2 0 @1-----
a =min.limit switch
5 © © r--�-- b = max. limît swîtch
C = capacîtor (9+4-uF for 50Hz.
I'?> o.
9uF for 60Hz)
6 -.::::, v M = reversible electric motor
{115V/0.65A)
L = coil lor brake mechanism
FIG. 3.8B INTERNAL WIRING DIAGRAM
OF SLIDE VALVE ACTUATOR
The following measuring devices are installed:
- Three pressure gauges tor suction pressure (30c), dis
charge pressure (30b) and lubricating {: pump) oil press
ure (30d) respectively. These pressure gauges are
grouped logether behind a
window
inside a closed
cabinet sîtuated on the package front sïde. lf the package
js equipped with an economizer manifold (50), the cabinet
contains an additional pressure gauge (30a).
- Three digital read-outs (301, 30j & 30k) to indicate the ac
tual (superheated) suction temperature, the discharge
temperature and the oil temperature downstream the oil
cooler respectîvely. lf the package is equipped with an
economizer manifold (50), an additional digital; read-out
(30m} is provided to indicate the actual injection gas tem
perature.
The oil and discharge temperature digital read-out form
part of the max. oil and max. discharge temperature
safety switch respectîvely. See also further on under
safety devices.
The suction and injection temperature read-out are separ-
ate devices with their own sensing elements fitted via a
sealed connector insîde the relevant lînes.
• A digital read-out (30n) to indicate the aciual (part-laad)
capacity in percentage of the full-laad capacity.
• An oil level sight glass (9) on the oll separator to check
whether the proper arnount of oil is available inside the
separator.
The following safety devices are installed:
- An electronic "max. discharge temperature" safety switch
(30j) which can be set at values between O and 100
·c_
This safety switch incorporates a dlgital read-out to indi-
Page3.10
Compressor Package GSLP
92.01
