Operating manual - SAB 120-151 A-frame (including ATEX)
008668 en 2019.08
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1.
On start-up the unit should be operated at the highest load possible for 3 hours. During
that period, adjust liquid injection oil cooling, if applicable. If unit has water-cooled oil
cooling, adjust water control valve to cooler (if applicable).
2.
The compressor slide valve should be calibrated.
3.
Pull and clean suction strainer after 24 hours of operation. If it is excessively dirty, repeat
every 24 hours until system is clean. Otherwise, follow the
Maintenance schedule
in sec-
tion
8.1 Maintenance of compressor unit
.
The following procedure applies to SAB 151 only:
•
During the initial start-up of the unit, it is imperative that the hand expansion valve on the
main oil injection line is fully open to ensure adequate oil flow. Using a demand oil pump,
it may be necessary to throttle with half open valve before start-up. The valve must be at
least half a turn open.
There is still an orifice installed in the compressor to control maximum oil flow. At initial
start-up of the compressor, the hand expansion valve must be fully open. After initial
start-up of the unit, the hand expansion valve should be adjusted.
First method
The best method to determine target discharge temperature is to run CoolWare™/Comp 1
or ScrewSelect with the operating conditions of the compressor. The program will give you
a theoretical discharge temperature of the compressor. Once this temperature is known,
you may adjust the hand expansion valve. The ideal discharge temperature is within
+2.7°C or -2.7°C of the theoretical discharge temperature. Adjust the valve to achieve
the theoretical discharge temperature.
Second method
If you do not have access to CoolWare™/Comp 1 or ScrewSelect, 82°C is a good target
discharge temperature for a high stage ammonia compressor. Booster applications and
compressors using HFC and HCFC refrigerants may run cooler. Compressors with high dis-
charge pressure may run hotter.
The first method
is used for compressors with external oil cooling (Refrigerant-cooled
(thermosyphon), water-cooled and glycol-cooled).
Before the initial start-up of the compressor close the hand expansion valve completely.
Open the valve back up and count the turns that it takes to fully open the valve. After the
initial start-up close the valve to achieve approximately 82°C discharge temperature or
the theoretical temperature from CoolWare. Do not fully close the valve at any time while
the compressor is running.
The second method
is used for compressors with liquid injection oil cooling. Because
the discharge temperature is controlled by the liquid injection thermal expansion valve
you will not be able adjust for the correct oil flow by using the discharge temperature.
Before the initial start-up of the compressor, close the hand expansion valve completely.
Open the valve back up, and count the turns that it takes to fully open the valve. After the
initial start-up, close the valve ½ way. If it took 10 turns to open the valve completely,
then turn it in 5 turns. If it took 7 turns to open, then close the valve 3½ turns. Do not
close the valve any further than ½ the number of turns required to fully open it.
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