Hypertherm Koolant Koolers N-Series, User Manual, Page: 50 / 77

Troubleshooting ‐ Inline Heater Temperature Limit Switch
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9.2 Inline Heater Temperature Limit Switch
The chiller is equipped with a mechanical, temperature limit switch that disengages (trips) the heater in the
event of a malfunction to prevent excessive fluid temperatures that could result in fire hazards. If the switch has
tripped it can be reset by performing the following steps:
1. Access the chiller’s air intake/filter side (refer to section 6.4 Internal Access).
2. Locate the temperature limit switch (refer to
3. Figure 41).
4. Unscrew the cap on the temperature limit switch to access the green reset button.
5. Press the reset button with a screwdriver of appropriate size until a tactile click is felt. If the button is
loose and there is no click then the switch is already closed. If the button will not remain closed
(engaged) after attempting to press, then the temperature of the pipe, in which the inline heater is
located, is still too hot. Allow the pipe surface to cool before attempting to reset the switch.
6. Reinstall the cap on the temperature limit switch.
7. Reinstall the air intake filter(s) before restarting chiller.
9.3 Refrigeration High Pressure Switch
WARNING
The refrigeration discharge lines may be extremely hot – avoid contact. Resetting of the
refrigeration high pressure switch should only be performed by qualified personnel equipped
with proper safety gear and tools.
The chiller’s refrigeration circuit is equipped with a mechanical, high pressure switch that disengages (trips) the
refrigeration circuit when dangerously high pressures occur to prevent damage to the refrigeration system. If
the switch has tripped it can be reset by performing the following steps:
1. Access the chiller’s air intake/filter side (refer to section 6.4 Internal Access).
2. Locate the refrigeration high pressure switch (refer to
3. Figure 41).
4. Depress the red reset button until a tactile click is felt.
5. Reinstall the air intake filter(s) before restarting chiller.
Hypertherm, Inc. Part Number: 810540