cilltate a smooth start-up. With power to the motor off,
power supplied to the panel and the oil temperature below
40
·c
verify that the oil heater
is
on by checking the current
drawn.
Alternatively check the heater element by noting the relatfve
temperature of the separator at the element and the oppo
site side.
The machine should never
be
started until the oil is 20 ·c or
5.5
·c
above saturation temperature of the package press
ure whichever is higher. ldeally, the temperature shoufd be
27
·c
to 38
·c.
4.13 ELECÎRICAL CHECK
Before attempting to start the compressor, the e.lectricaf con
trol system, safety switch- es and capacity coritrols must be
checked in a simulated operating condition.
IMPORTANT
Be sure there is oif in the separator so the oil heater wil/ not
burn out.
The simplest and most reliable method of checking the elec
trical system is to teed the power supply to the control panel
with the main drive motor power dlsconnected. This can be
accomplished by disconneding the motor power at the main
power disconnect. lf the control power is also supplied frorn
the main disconnect, a separate temporary source shoufd
be obtained or the motor starter should be disconnected.
4.14 SAFETY SWITCH ADJUSTMENT AND CHECK
All switches are to be adjusted to values shown in
Table 4.2.
LOW OIL PRESSURE SAFETY SWITCH
Setting of the safety switches is effected by turnlng the main
spïndle with a spanner. The set vatue can be read from a
graduated scale fn the front cover (see fig. 4.3).
Setting of the differential safety switches takes place by turn
ing the setting disc with a screwdriver; this setting disc is ac-
-
cessible after the front cover has been removed. The set
value can be read trom a graduated scale.
Setting of the temperature safety switches is effected by
turning the adjusting knob, situated in the centre of the front
cover. The individual settings and adjustments safety swit
ches
are
given in
tab)e
4.2.
DISCHARGE AND OIL TEMPERATURE
SAFEîY SWITCH
SUCTION AND DISCHARGE PRESSURE
SAFETY SWITCH
OIUSUCTION DIFFERENTIAL PRESSURE
SAFETY SWITCH
oll temperature
("\ 0
s
s
at,;r' o�o of;),
@:�
o
"�
l\l!ill
8 t..tC :\� .'.i.À\')
t'lo�• ..... i,,,,
JJ1•-:1;1
-t ,-�
f.l •'
1
f
i
lo�o�
e
.
.,.,,
e
0
Page 4.6
discharge temperature
0
� e
"1,,.:1.:-1:illl"'
�s:\J':: "{ "-='"
Çl
lPP
{J';
,
3-1"'"
e
0
RTl -RT1A
(min. suction pressure)
(max. suction pressure)
RTSA-RTSAB (ma,ç, discharge pressure)
QJD
3
1 Main spindle
2 Graduated scale
3 Adjustîng dîsc
FIG. 4.3 SETTING OF SAFETY SWITCHES
Compressor Package GSLP
RT260A
□
92.01
