Cooling Water Connection (Optional)

Water-oil heat exchanger without inlet accessories

Water-oil heat exchanger with inlet accessories

Description

CWI

Cooling water inlet

CWO

Cooling water outlet

PS

Pressure switch

TV

Thermostatic valve

WBV

Water bypass valve

WF

Water filter

WHE

Water-oil heat exchanger

The thermostatic valve (TV) is used to control the water flow in order to keep a stable machine temperature.

The factory default adjustment of the thermostatic valve (TV) is set in position 2 (approx. 75°C oil temperature).

The pressure switch (PS) is used to monitor the presence of water at the cooling system of the machine.

When the pressure switch detects a pressure lower than 2 bar, the machine must be stopped.

The water bypass valve (WBV) is used at the first machine start-up. At that moment it should be open (approx. 90 seconds) to prime the water heat exchanger, afterwards it should be closed.

  1. Connect the cooling water connections (CWI / CWO) to the water supply.

Connection size:

  1. If necessary, electrically connect the pressure switch (PS):
  2. See Wiring Diagram Pressure Switch of Water-oil Heat Exchanger (Optional).
  3. Make sure that the cooling water complies with the following requirements:

Min. supply capacity

l/min

2.5

Water pressure

bar (g)

2 ... 6

Supply temperature

°C

+5 ... +35

Required pressure differential across supply and return

bar

≥ 1

  1. To reduce the maintenance effort and ensure a long product lifetime, we recommend the following cooling water quality:

Hardness

mg/l (ppm)

< 90

Properties

Clean & clear

PH value

7 ... 8

Particle size

µm

< 200

Chloride

mg/l

< 100

Electrical conductivity

µS/cm

≤ 100

Free chloride

mg/l

< 0.3

Materials in contact with the cooling water

Stainless steel, copper and cast iron

NOTE

Water hardness unit conversion.

1 mg/l (ppm) = 0.056 °dh (german degree) = 0.07 °e (english degree) = 0.1 °fH (french degree)