# Maintenance

# Maintenance

- **Chiller maintenance** *(Source Section 3.11)*: Replace chiller liquid every 3 months under light usage, or monthly under heavy usage. Use distilled water only; drain before extended non-use or transport. Keep the unit ≥30 cm from obstructions at the rear air outlet and ≥10 cm from obstructions at the side air inlets, in a well-ventilated, dry location away from heat sources. Adjust the flow-control valve (clockwise to reduce flow, counter-clockwise to increase) to reduce vibration at high magnification (particularly 100x); do not fully close the valve (90° clockwise) while the chiller is operating — only reduce flow as needed for a specific lens, then return to full flow for lower magnifications.
- **Controller servicing** *(Source Section 1.1)*: There are no user-serviceable parts inside the EZ-THERM controller. Do not remove covers. Exposed AC power can be present even with the power switch off — turn off power and unplug the line cord before checking or replacing the fuse, and use only the specified fuse value. Do not attempt to bypass or repair the fuse.

*(The source manual does not include a dedicated, separate "Maintenance" chapter beyond the items above — this section consolidates all explicit maintenance/servicing guidance found elsewhere in the source.)*