Hypertherm Koolant Koolers N-Series, User Manual, Page: 28 / 77

Operation ‐ Initial Startup
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Table 7: Recommended Compressor Warm ‐ up Time
Disconnect off Time Compressor Warm ‐ up Time
< 30 min 0 min
30 min to 2 hrs 2 hrs
2 hrs to 4 hrs 4 hrs
> 4 hrs 8 hrs
CAUTION
Starting the chiller pre ‐ maturely without allowing adequate time for the compressors to warm ‐
up can allow the liquid refrigerant to be pumped through the compressor lubrication system
and cause permanent damage to the compressor bearings and void the chiller warranty.
7.2 Initial Startup
7.2.1 Local Mode Start ‐ up
The chiller can be operated in a Local Mode where it operates independent of the plasma cutting system, or in a
Remote Mode where it starts and stops automatically based on the state of the Remote Start/Stop interlock
from the plasma cutting system. Upon initial startup the chiller should be started in Local Mode to checkout
chiller operation independent of the plasma cutting system.
7.2.1.1 Starting the Chiller in Local Mode
To start the chiller turn the Local/Off/Remote Switch below the controller to the position. The pumps
will turn on and start circulating water.
7.2.1.2 Leak Check

Thoroughly check all the plumbing hoses and fittings between the chiller and plasma cutting system
to ensure no leaks are present.

Remove the filter panel from the side of the chiller and inspect the internal chiller plumbing to
ensure there are no internal plumbing leaks.

Replace the filter panel.

If any leaks are found turn the Local/Off/Remote Switch to the “O” position and wait for the pumps
to automatically shut off (The process pump shuts down in ~3s and the recirculation pump in ~10s).

Once any leaks have been repaired restart the procedure at 7.2.1 Local Mode Start ‐ up.
7.2.1.3 Process Pump Check
From the chiller controller home screen press and/or to highlight the MONITORING selection. Press
to access the MONITORING menu and press until the “Process Fluid Circuit” monitoring screen
appears. Check the process pump “Flow Rate” to make sure it exceeds 1.3gpm (4.92lpm) at 50Hz or
2.2gpm (8.33lpm) at 60Hz. Also check the process fluid circuit discharge pressure (“Dis Press”) to ensure it
is at least 10psi (68.9kPa) below the shutdown pressure of 240psi (1,655kPa). The process pump circuit is
equipped with a pressure relief bypass valve that is set to start opening at 190psi (1,310kPa) and fully
bypass the flow at 230psi (1,586kPa).
Hypertherm, Inc. Part Number: 810540