Atlas Copco 1621485008 Oil Cooler

Description

The 1621485008 is the oil cooler Atlas Copco fits as a pair to the water-cooled oil circuit of the GA 132 W, GA 160 W, G 132 VSD and G 160 VSD rotary screw compressors. The machine carries two of these units in its oil circuit, and the official parts record names the part OIL COOLER with a quantity of two against each compressor.

Where the smaller water-cooled GA 90 W and GA 110 W run a single oil cooler, the larger GA 132 W, GA 160 W and their VSD water-cooled versions use the 1621485008 in a matched pair. The part is the dedicated heat exchanger that brings the lubricant back to its working temperature before the oil returns to the compression circuit, and a workshop renews the position as two complete exchangers against the compressor it belongs to.

In an oil-injected screw machine the oil carries three jobs at once: it seals the gap between the rotors, it pulls heat from the compression chamber, and it lubricates the bearings and the element.

The 1621485008 takes the heat out of that oil as the oil passes through the cooler, where the heat is given up to the cooling water on the other side of the exchanger walls. The oil that returns to the machine stays inside the band the package was designed around, and the pair shares the load so each unit runs inside its rated condition through a long loaded shift.

What the Oil Cooler Pair Does in the Water-Cooled Circuit

Hot oil leaves the compressor and passes through the 1621485008 units on its way back to the element. The water-cooled design moves the heat of the oil circuit into a cooling water flow that carries it away from the machine, so the oil that leaves the coolers is cool enough to seal, lubricate and carry the next round of compression heat. The two units together hold the oil temperature inside the band the package was designed around.

The lubricant temperature is the whole reason this component is fitted to the circuit. When the 1621485008 pair is doing its job, the oil entering the element stays inside the working band and the package runs steady under load. Coolers that have lost capacity show up first as an oil temperature that climbs under a familiar load, which is what puts the 1621485008 pair on the maintenance plan.

The Two-Unit Arrangement on the Larger GA Compressors

The GA 132 W, GA 160 W and the water-cooled G 132 VSD and G 160 VSD are larger machines than the GA 90 W and GA 110 W, and they carry two oil coolers rather than one. The 1621485008 is listed with a quantity of two in the parts records for these compressors, so an order for the position is a pair of exchangers, not a single unit.

Running the oil circuit through two 1621485008 units splits the thermal load between them. Each cooler handles part of the oil flow, and the pair as a whole delivers the heat rejection the package was engineered to provide. A renewal replaces both units together so the circuit returns to its original balance rather than running one new core against one aged one.

Because the machine needs two, the confirmation step records the model, the serial and the cooler number, then books the 1621485008 as a quantity of two. Seadweer confirms the fitment against the serial before the order is placed, so the pair that arrives is the pair the compressor was built with.

The Cooling System the Coolers Belong To

The water-cooled GA package carries its heat exchangers in one cooling-water circuit: the aftercooler that cools the compressed air, and the oil coolers that cool the lubricant. On the GA 132 W and GA 160 W the oil circuit uses two 1621485008 units while the aftercooler sits in the same water circuit, so the oil coolers are cooled by the same water that serves the rest of the package.

The cooling water enters through the inlet pipe, passes through the tube stacks of the aftercooler and the 1621485008 pair, and leaves through the outlet pipe. Oil and water never meet; they run through separate passages divided by the exchanger walls, and heat moves from the oil side to the water side across those walls. The pair is supplied with its ports and mounting points in place as two separate exchangers.

The Water Circuit Through the Tube Stacks

Each 1621485008 is built as a tube-stack oil cooler for the water-cooled GA range, with the oil running through its own passages while the cooling water runs through the tube stacks next to them. The two units are mounted in parallel in the oil circuit so the flow is shared, and each presents to its original mount without adaptation when it is the part specified for that position.

The coolers present to the original mounts without adaptation. The 1621485008 is the part the GA 132 W, GA 160 W and the water-cooled VSD models were built with, so the oil lines meet the ports on the units as the machine was designed, and a renewal is a straight swap on the planned stop rather than a modified fitment.

How the Oil Temperature Is Controlled

The water-cooled GA oil circuit uses a thermostat bypass valve that regulates how much oil reaches the coolers. While the oil is cold the valve sends most of the flow around the 1621485008 pair so the machine warms up quickly, and once the oil is warm the valve opens and the full flow passes through the coolers to hold the temperature steady. The pair works inside this regulated circuit rather than on its own.

The Thermostat Bypass Valve

On the water-cooled GA units the bypass valve closes the oil supply to the coolers at low oil temperature and opens it fully as the oil warms, so the lubricant is brought to its working range and then held there. The 1621485008 pair is sized and positioned for that regulated flow, and a renewal restores the heat rejection the circuit was designed to deliver.

Because the valve manages the temperature, the coolers themselves are passive exchangers sized for the full warm-flow condition. The 1621485008 is matched to the GA 132 W, GA 160 W and water-cooled VSD oil circuit, and the parts list for the serial confirms the exact pair fitted before any order is placed.

Construction and the Unit as Supplied

Looking at the 1621485008 from the outside, each body is a purpose-built tube-stack oil cooler with its end tanks, ports and mounting flanges in the positions the GA range was engineered for. The unit needs no preparation before it is fitted; every connection is already in place when the cooler arrives, so it presents straight to the original mounts in the compressor bay.

The units are supplied new and uninstalled, still prepared for transit, so the 1621485008 pair reaches the workshop ready to fit. A flat, dry area with the ports covered is all the parts need between goods-in and fitment, and the bodies are kept clear of stacked loads so the exchangers are not stressed before they are installed.

Dimensions, Weight and Handling

Each 1621485008 measures 950 × 250 × 200 mm and weighs 33 kg. The 950 mm figure is the length of the body, the run that sits in the compressor bay, while the 250 × 200 mm face is the surface to protect while the units move through the workshop.

At 33 kg each the coolers are a two-person lift with normal workshop handling, and the rectangular bodies need a level surface rather than a narrow shelf. A flat, dry area with the ports covered is all the 1621485008 pair needs between goods-in and fitment, and the bodies are kept clear of stacked loads so the exchangers are not stressed before fitting.

Those same dimensions decide where the cooler sits in the package. The coolers sit in the bay the GA 132 W, GA 160 W and water-cooled VSD models were built with, and the oil lines meet the ports on the end tanks without adaptation when the 1621485008 is the part specified for that position.

Application Across the GA 132 W / GA 160 W and VSD Range

The 1621485008 is the oil cooler pair for the larger water-cooled GA compressors: the GA 132 W, the GA 160 W, and the water-cooled G 132 VSD and G 160 VSD. The same GA parts family spans the GA 90 through GA 160 and their variants, but the smaller water-cooled GA 90 W and GA 110 W use a different oil cooler (1614866108, a single unit), so the 1621485008 is confirmed against the model and serial rather than assumed across the whole range.

Keeping the model, the serial and the cooler number on one line keeps every renewal straightforward. If the old label has worn, the nameplate and the serial still settle it, since the parts list for that serial is what names the oil cooler in the circuit. The 1621485008 is the line booked against as a quantity of two, and the packed form and current package details are confirmed with the quotation.

When the Oil Coolers Are Renewed

A cooler is renewed on condition rather than on the calendar. Oil temperature that rises under a load the machine used to carry, a visible leak at a port or a joint, damage to the body, or a restriction that shows up as a pressure difference across the oil circuit are the signs that put the 1621485008 pair on the maintenance plan.

Keeping the coolers clean protects their capacity. On the water-cooled GA units the cooling water passes through the tube stacks of the 1621485008 pair, and the circuit is checked as part of the routine service so the oil temperature stays inside its band. A workshop that keeps those readings in the machine file can book the pair and the stop together, instead of reacting to a high-temperature trip on a loaded machine.

On the day of the change, the oil circuit is drained as required, the lines are removed from the ports with their positions noted, and the old cores are lifted out of their bay. The 1621485008 pair is presented to the same mounts and the same lines, and the joints are sealed before the circuit is refilled. The first loaded run is watched against the oil temperature recorded for the old units.

Identification and Ordering

Two pieces of information lock the order: the number on the cooler being replaced, which reads 1621485008 for the current version, and the model and serial number from the compressor nameplate. The serial matters because the parts list for that machine names the oil cooler built into its circuit, and the presence of a pair in that circuit confirms the larger water-cooled unit rather than the single cooler of the smaller range.

Pass both to Seadweer and the desk confirms the fitment in a single step, with no follow-up questions. When the label has gone, the nameplate alone is enough, because the parts list for the serial is what settles the match.

Sites with several machines keep the model, the serial and the cooler number logged together for each one. That record is what turns the next renewal of the 1621485008 into a single confirmed message, and it keeps the dimensions of the body with the part number for the next fitter.

Technical Specifications

The tables below collect the identification data and the physical figures recorded for the 1621485008.

Part Identification

Application and Fitted Models

Dimensions and Weight

The current number is the line an order is placed against, and the parts desk confirms the packed form and the current package details of the 1621485008 with the quotation.

FAQ

What does the 1621485008 do inside the compressor?

The 1621485008 is the oil cooler in the water-cooled oil circuit of the Atlas Copco GA 132 W, GA 160 W and the water-cooled G 132 VSD and G 160 VSD compressors. It moves the heat the oil gathers from the compression chamber across to the cooling water before that oil heads back to the element.

Which Atlas Copco compressors is this oil cooler fitted to?

The 1621485008 fits the water-cooled GA 132 W and GA 160 W and the water-cooled G 132 VSD and G 160 VSD. The parts list for that serial is what names the oil cooler in its circuit, and the fitment is checked against the model and serial instead of assumed from the family.

Why are two oil coolers supplied?

The larger water-cooled GA compressors carry the 1621485008 as a matched pair, listed with a quantity of two in the parts record. The pair shares the oil flow so each unit runs inside its rated condition, and a renewal replaces both together to keep the circuit balanced.

What size and weight is each oil cooler?

Each 1621485008 measures 950 × 250 × 200 mm and weighs 33 kg. The 950 mm figure is the length of the body, and the 250 × 200 mm face is the surface to protect during handling.

Does the 1621485008 also cool the compressed air?

No. The 1621485008 is the oil cooler for the lubricant circuit, while the aftercooler in the same package cools the compressed air. The two oil coolers and the aftercooler are separate exchangers cooled by the same water circuit.

What do I send to order a replacement oil cooler pair?

Read the number on the cooler being replaced, which reads 1621485008 for the current version, and note the model and serial number from the compressor nameplate. Pass both details to Seadweer and the fitment is confirmed before any order is placed.

More Coolers We Can Supply

Further Atlas Copco coolers can be supplied on request. Have a look at the table below, or get in touch with us for more information.