ATC K-Series, Instruction Manual

Page: 12 / 21

K1, K3 series chillers
– Installation and Operation manual
Issue 10.24 Page 10
K 39 Controller error messages
If the set point is moved more than 10°C the alarm may be triggered. The alarm resets when
coolant temperature cones within 10°C of the set point. It is not possible to set the tempera-
ture outside the pre-set values of +4°C and +35°C.
3.2 – Changing the Flow and Pressure
K series chillers contain a high pressure volumetric pump capable of 150 psi. All units are
supplied with a pre-set maximum of 50 psi. Pressures above this will cause the internal safety
bypass valve to open, protecting your application from potentially dangerous
pressures.
It is possible for customers to change the operating pressure of the chiller, as follows:
•
Remove the top panel (K1) or left side panel {viewed from the front} (K3) from the
chiller by removing 2 screws at the rear of the panel.
•
With the chiller running, release the locking nut on the pressure relief valve; a grey
valve located at the right side of the chiller, as viewed from the front.
•
Turn the valve knob anticlockwise to reduce the flow/pressure, clockwise to
increase the flow/pressure. Re-tighten the lock-nut.
•
The pressure can be observed on the gauge on the front panel.