Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
008831 en 2020.10
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Technical description
4.21 Selecting lubricating oil for Sabroe screw compressors
To ensure the compressor unit a long service life with safe and reliable operation, it is important
to use an oil type recommended by Johnson Controls Denmark. Please refer to Sabroe oil recom-
mendation where various oil types are listed in a table including oil brand, oil code and part
numbers.
Warning!
Only use oil recommended by Johnson Controls Denmark when first charging the plant and when
recharging. Mixing different oil types can cause irreversible damage.
4.22 Oil charge
See subsection 11.13 Oil charge.
4.23 Heating rod element for oil heating, pos. 30
In order to keep the lubricating oil in the compressor warm during a standstill period, the oil re-
ceiver has one or two built-in heating rods. Before start-up, the heating rods must have been acti-
vated for six to eight hours to ensure that there is only a minimum of refrigerant in the oil. When
containing a lot of refrigerant, the oil will lose its lubricating property and tend to foam, which can
cause shutdown by the level switch.
As illustrated in Fig. 30, the direct heating rod consists of an electric heating element incorporated
in a pipe with a diameter of 30 mm. The entire heating cartridge is screwed on tightly at the G 1 1/
4" thread. It is available in ATEX execution.
Note: The heating rod must not be energised if the oil level in the receiver is below the minimum
mark in the sight glass, and it should generally be switched off during compressor operation.
Fig. 30: Heating rod, type A
Heating rods
Used for:Power
Watt
Voltage
V
L1
mm
L2
mm
460
460
460
250
230
115
158 175
SAB 120/151/193/233/283/355
80L2
L1
NV50
G 1 ¼
30
50
M
arking: Prod. no.
Watt
Volt
Manu. date
ø 30
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