Instruction manual

K4, K6, K9 series chillers – Installation and Operation manual
Issue 10.33
Page 10
Adjusting fluid flow and pressure
It is possible to change the operating pressure of the chiller, also using the pressure
control valve, as follows:
1. With the chiller running, release the locking nut on the pressure control valve.
2. Turn the valve knob (‘A’ in Figure 2, page 11) anticlockwise to reduce the
flow/pressure, clockwise to increase the flow/pressure. NOTE - in optional low
temperature chillers this is metallic and covered in insulating material
3. The pressure can be observed on the gauge on the front panel.
Caution:
Changing the flow/pressure with the pressure control valve will also change the preset
pressure safety setpoint. This will move to a lower pressure than the factory setting when
decreasing the flow/pressure, and to a higher pressure when increasing the flow/pressure.
Caution:
When the flow/pressure is manually increased with the pressure control valve, the safety
provided by the valve will be effected at higher pressures than standard. For this reason,
please ensure that it is safe for your application to operate at pressures in excess of 50 psi,
even if the pressure setting on the chiller reads lower than this. A blockage in your
application could result in the pressure exceeding the raised safety pressure, and while the
K series chiller is tested to 120 psi, your application may not be safe at this pressure.
We recommend that pressures exceeding 100psi must never be used.
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