pressure respectively, until the required
pressure difference has been achieved. After
resetting,
replace the cap nut with sealing ring on the
pressure regulator.
7.4 SETTING OF PRESSURE SAFETY SWITCHES
(see fig. 7.2)
The discharge pressure and suction pressure
safety switches
must be set at the values
indicated in the plant manual. The discharge
pressure safety switch must be set at a value
which is lower than the maximum discharge
pressure of the compressor (see chapter 3,
Technical data of compressor).
Setting is effected by turning the main spindle
with a spanner, after the cap on top of the
housing has been removed. The set value can be
read from a graduated scale in the front cover.
The lubricating oil pressure safety switch
must be
set at 1 bar, which is the minimum allowable
difference between oil pressure and crankcase
pressure (= sucton pressure). Setting takes place
by turning the setting disc with a screw driver; this
setting disc is accessible after the front cover has
been removed. The set value can be read from a
graduated scale.
Refrigeration Division
Grasso
7. STARTING, STOPPING AND ADJUSTMENT OF COMPRESSOR
v002.97.10.en
Refrigeration Compressors Series RC9
Page 7.3