Reciprocating Compressor M Series
4-2
4.1.2 Initial Charging Method
When charging the oil initially or changing the oil after overhaul, charge the oil from the initial supply port to fill
the oil cooler, oil filter, and oil passages with the oil.
No. Description
1
Oil supply port
4.1.3 Replenishment of the Oil
The refrigerant oil level lowers gradually during the operation. While the oil level can be checked through the oil
sight glass, replenish the oil in the following manner.
z When replenishing the oil, be careful so that the oil will not be contaminated by
air or water.
z When replenishing the oil, use clean oil with no foreign materials contained.
z To prevent bubbling in the crankcase, supply the oil gradually.
z To avoid absorption of water vapor in the air, store the refrigerant oil with it
sealed until it is used.
<Replenishment Method during Operation (Example)>
1. Close the compressor suction shut±off valve gradually until suction pressure becomes slightly vacuum
(approx. -0.026MPaG(±3.77 PsiG) (±20 cmHg)).
2. The oil will be vacuumed gradually from the oil supply/drain valve (oil drain valve) on the compressor.
3. After the specified amount of oil is replenished, close the oil supply/drain valve completely.
4. Open the suction shut±off valve gradually, and change the equipment to the steady operation.
4.1.4 Set Oil Pressure
Adjust the oil pressure to 0.15 ² 0.25 MPa (21.75 ² 36.26 Psi) above suction pressure (maximum of
0.4MPa(58.02 Psi)) using the oil pressure regulating valve.
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