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BTF4G-30.3G Large High-Pressure Reciprocating Compressors Big Four-cylinder

T-Series Medium Four-Cylinder Piston Refrigeration Compressor for Environmental Simulation Test Chambers

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T-Series Medium Four-Cylinder Piston Refrigeration Compressor for Environmental Simulation Test Chambers

Blait BTF4 L4 series semi-hermetic reciprocating compressor for large cold rooms and cold-chain plant. Four cylinders, 55 mm stroke, 73.6 to 84.5 m3/h at 50 Hz, 18 to 30 HP. The body is a heavy casting with forced oil-pump lubrication and a 4.5 L oil charge, so the bearings stay fed through long low-temperature shifts. BTF4H models run a 70 mm bore, BTF4G models a 75 mm bore. Order the E version with ester oil for R404A or R507A, or the R version with mineral oil for R22. Supply is 380-420 V / 3 phase / 50 Hz or 440-480 V / 3 phase / 60 Hz with a part-winding start motor. Suction 54 mm (2 1/8 in) and discharge 28 mm (1 1/8 in) on the three larger models; the smallest model takes 42 mm (1 5/8 in) suction. Send the room volume, the temperature you hold and the refrigerant, and we confirm the model and the capacity it gives.

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Model:
BTF4H-15.3Z~BTF4G-30.3G
Brand:
Blait

Highlights at a glance

PICK BY ROOM, NOT BY GUESSWORK Four models cover eighteen to thirty horsepower. Tell us the room volume and the temperature you hold, and we point at the model that fits.
OIL THAT KEEPS COMING A pump pushes oil to the bearings the whole time the machine runs. On long low-temperature shifts that is what keeps a bearing from running dry.
SUCTION PORT SIZED FOR THE LOAD The larger models share one wide suction port, so gas returns with less pressure drop and the machine works less for the same cooling.
WORKS ON THE REFRIGERANT YOU RUN R404A or R507A with ester oil, or R22 with mineral oil. You order the version that matches the plant you already have.
HARDENED CYLINDER BORES The bores are hardened before assembly, so the wear surface lasts longer and the machine holds its capacity between overhauls.
A VALVE PLATE THAT TAKES SHOCK The valve plate is shaped to soften the discharge pulse. Fewer broken reeds means fewer unplanned stops.
TERMINAL BOX ON TOP The electrical box sits on top of the machine, not at floor level. Your electrician wires and inspects it standing up.
BOLTS DOWN AND STAYS PUT The cast feet take through bolts into a plinth or a steel frame, so the machine does not walk when it starts under load.
WEAR PARTS COME OFF ON THEIR OWN This is a bolted, repairable machine. A worn piston, liner or valve plate is replaced on its own instead of the whole compressor being scrapped.
WE CHECK BEFORE YOU PAY Send a photo of the nameplate and the duty you need. We confirm the model and the capacity it gives before the order is placed.

How do I pick the right model?

Send the room volume, the temperature you hold and the refrigerant. We come back with the model and the capacity it gives at that duty. If two models fit, we say which one leaves you room to grow and which one is cheaper to run.

R22 version or R404A version - which one do I order?

Order the R version with mineral oil if the plant already runs R22. Order the E version with ester oil for R404A or R507A. Mixing the two oils is what damages a compressor, so tell us the refrigerant before we quote.

Which model code do I need?

The code carries the cylinder count, the frame letter, the rating and the temperature version. Rather than decode it by message, send the duty and we write the exact code on the quotation. If you have an old unit, the nameplate photo is enough.

How much cooling do I get at my room temperature?

At 40 C condensing and 20 C suction the range gives 50.1 to 58.6 kW at -5 C evaporating, and 11.5 to 14.6 kW at -35 C. The capacity card carries the full table. For your own room send the evaporating and condensing temperatures you work between.

Can you supply a 60 Hz version?

Yes. Supply is 380-420 V / 3 phase / 50 Hz or 440-480 V / 3 phase / 60 Hz with a part-winding start motor. At 60 Hz multiply the 50 Hz capacities by 1.2; the maximum working current stays the same.

What pipe sizes do the ports take?

Suction 54 mm (2 1/8 in) and discharge 28 mm (1 1/8 in) on BTF4H-25.3G, BTF4G-20.3Z and BTF4G-30.3G. The smallest model, BTF4H-15.3Z, takes 42 mm (1 5/8 in) suction with the same 28 mm discharge.

How much oil does it take, and which oil?

4.5 litres. Ester oil for the R404A / R507A version, mineral oil for the R22 version. We confirm the grade with the order so it matches the refrigerant in your plant.

What is the minimum order, the lead time and the warranty?

Minimum order is 1 units, lead time is 30 days after the order is confirmed, and warranty is 12 months. Ask us for the current figures with your model and quantity and we put them in writing on the quotation.