TK 61753-2-MM-EN
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Checking Compressor Oil Pressure
The oil pressure at the oil pressure access port varies with the suction pressure in the compressor. Therefore, we need
to calculate the “net oil pressure” to determine the actual compressor oil pressure. The net oil pressure is the pressure
at the oil pressure access port minus the suction pressure below the throttling valve. Use the following procedure to
check the compressor oil pressure.
1. Attach a suitable oil pressure gauge to the oil pressure access port on the compressor oil filter, or to the oil pressure
access port on the oil pump cover.
2. Attach the low pressure gauge of a gauge manifold to the fitting on the side of the throttling valve (or suction valve
adapter). This fitting allows you to monitor the suction pressure in the compressor below the throttling valve.
3. Start the unit and note the pressure at the oil pressure access port and the suction pressure below the throttling
valve.
4. Subtract the suction pressure below the throttling valve from the pressure at the oil pressure access port to get the
net oil pressure.
Pressure at Oil Pressure Access Port
– Suction Pressure Below Throttling Valve
=
Net Oil Pressure
5. The net oil pressure should be at least 20 psig (1.38 bar). If the net oil pressure is low, first check the compressor oil
level, then check the compressor oil pump and relief valve.
RReeffrriiggeerraattiioonn SSeerrvviiccee OOppeerraattiioonnss
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