Checking The Water Circuits; Initial Start-Up; Checking The Adjustment Of The Control Slide; Checking The Control Slide Adjustment Times - GEA Grasso M-Series Operating Manual

Operating Manual | GEA Grasso M-Series
Screw Compressor Packages
4. The real values have to record at data sheet of
coupling documentation. Please send back a
copy of the filled data sheet to:
GEA Refrigeration Germany GmbH
Holzhauser Straße 165
13509 Berlin
Fax: +49 (0)30 - 43 592 759
Caution!
Observe the maintenance instruction!
Regrease the coupling at the prescri-
bed intervals if scheduled in the main-
tenance instruction for the coupling!
8.5.12

Checking the water circuits

Check whether the cooling and cold water pumps
are running and the shut-off fittings in the cooling
water circuit are in their operating positions.
While the unit/ chiller is operating under project con-
ditions, adjust the cooling water control so that the
condensing and oil temperature lies within the per-
missible range.
8.5.13

Initial start-up

After carrying out the aforementioned works, the
SCP can be commissioned in accordance with the
operating manual of the control device.
1. Switch on the control voltage of the control
device.
2. Remedy and acknowledge existing fault mes-
sages.
3. Select manual operating mode.
4. Turn on SCP.
8.5.14 Checking the adjustment of the
control slide
1. SCP is running.
2. Select manual operating mode.
3. The maximum end position (100%) must be
reached and signalled when the "Increase
power" button is pressed.
GEA Refrigeration Germany GmbH | P_261511_1 | Generated 01.04.2015
4. The minimum end position (0%) must be
reached and signalled when the "Decrease
power" button is pressed.
5. Vent the adjusting device by moving the control
slide backwards and forwards about ten times.
8.5.15 Checking the control slide adjust-
ment times
Caution!
Only adjustment times between 30 and
60 seconds are permissible.
The throttle valves of the solenoid valves are adjus-
ted in the factory in such a manner that they ensure
an optimal adjustment time of the control slide of
between 30 and 60 seconds.
While running at operating temperature and pressure
conditions, determine the adjustment times needed
when the control slide is continually moved from the
maximum end position to the minimum end position
and back. For the automatic system to run smoothly,
the adjustment times in either direction must be
approximately the same.
The adjustment time can be adjusted with the help of
throttle valves DS5 and DS6.
Hint!
See the assembly instructions for the
screw compressor.
8.5.16

Checking the oil cooler

Guide value for oil temperature = see parameter
list
Oil cooling with water-cooled oil cooler
The water volume must be regulated so that the
cooling water volume corresponds to the project
value. The inlet and outlet temperatures must be
checked. The oil temperature adjusts automatically
via the 3-way valve.
Checking the oil cooling with refrigerant-cooled
oil cooler
No regulating or checking required.
8.5.17 Adjusting the amount of injection
oil and the oil temperature
Start-up
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