• Easy to maintain design • Compact installation dimensions • Rugged cooling matrix • System-compatible cooling matrix / flow rate ratio • Extensive accessories • High suction pump

Introduction and description Why coolers? In many cases, installing an off-line cooler is not only an emergency solution, but also the best solution with respect to mechanics and economics. Oftentimes off-line filtration can also be incorporated quite effectively. Since a bypass also always requires installation of a separate circulation pump, it’s reasonable to combine it with the motor already installed for the fan. The BNK series is a tiered line of oil/air coolers with circulation pump directly flange-mounted. The cooler size and pump flow rate are coordinated for performance grades compatible...

Model key BNK 4.4-30-0.75kW- IBx - T50 Motor power Pump output per litre Number of motor contacts Frame size To also have a bypass and/or thermal contact, the specification will be added to the type designation: BNK 4.4-30-0.75kW- IBx - T50 Bypass version Temperature switch external bypass internal bypass internal temperature-dependent bypass 2 bar / 45 °C external temperature-dependent bypass 2 bar / 45 °C bypass value 2 bar, 5 bar, 8 bar Temperature in °C, specification see separate data sheet Technical data Technical data Materials / surface protection Cooling battery: Ventilation box, safety...

Basic data (at 50 Hz frequency) Item no. Cooler model spec. cool- Cooling ing power power at kW/K ETD = 40 K (kW) max. circu- Motor power lation rate Number of poles (l/min) Rated current at 400 V We reserve the right to amend specification.

Calculation example and nomenclature tÖE [°C] specific cooling performance (see performance curves): Pspez = P / ETD Specific heat capacity of the oil (approx. 2.0 kJ / kgK) Calculation example Assumptions: Tank capacity Determining the cooler size: Pspez = P / ETD = 7.2 kW / 30 K = 0.24 kW/K Calculating P from the tank warming kg . kJ . 200 l .0.9 (318 K - 288 K) 2 V . ς . cOil. (T2 - T1 ) l kg .K P= = = 7.2 kW t 1500 s Select a cooler from the basic data with Pspez 0.24 kW/K. There is one option: BNK 3.4 with 30 L pump

*Connection for G ½ temperature switch Model

Functional diagram recommended position of additional oil filter The oil inlet is on the left of the cooling battery. The The oil inlet is on the bottom left of the cooling bat- oil outlet is always on the opposite side. tery. The second connection at the top must be closed. The oil outlet is always on the opposite External bypass AB/ATB (BNK 2-8) The oil inlet and outlet is always on the same side The oil inlet is always at the bottom left of the cool- of the cooling battery. The connection on the op- ing battery. The second connection must be posite side must be closed. closed. The oil outlet...