Hypertherm DuraChill 5 HP Air-Cooled Chiller For Hypertherm - Manual (Page 20)

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Section 6 – Routine Maintenance
6.1 Recommended Routine Maintenance Schedule
Routine Maintenance Procedure Frequency 1
Inspect and clean inline strainer Weekly for the first month of operation; every three months 1 thereafter.
Check reservoir coolant level Weekly
Check coolant freeze protection Monthly
Inspect and clean air filters Weekly for the first month of operation; monthly 1 thereafter.
1. Minimum maintenance frequency. Your plant condition may require more frequent inspection and cleaning.
6.2
Routine Maintenance Procedures
6.2.1 Inline
Strainers
The Chiller’s Inline Strainers should be inspected and cleaned weekly for the first month of operation. Once you are
certain that all debris that may have been generated or dislodged has been filtered from the coolant, strainer
inspection and cleaning can be performed less frequently.
1. Turn main Chiller power Off .
2. Using the Drain connection on the rear of the Chiller, remove a sufficient volume of coolant to bring the coolant level
below the level of the Inline Strainer..
3. Remove the Chiller’s left rear side panel. One Inline Strainer is located just above the recirculation pump.
4. Using an adjustable wrench or the proper size hex head socket, loosen and remove the Inline Strainer drain cap.
NOTE: There will be some residual coolant within the fitting housing the strainer which will drain out when the cap is
removed. Remove the strainer from the cap (or fitting) and clean off all trapped debris. Either water or high pressure
air can be used to remove the accumulated material.
5. Insert the strainer into the cap and reinstall in the fitting. Be sure to adequately tighten strainer cap.
6. Repeat for Inline Strainer located at outlet on rear of unit.
7. Replace drained coolant.
8. Restore power and turn Chiller On.
9. Check for leaks.
10. Replace Chiller side panel.
6.2.2 Reservoir Coolant Level
The reservoir coolant level should be checked on a weekly basis and replenished as required. A proper fill level is
approximately 2 inches (5.1cm) below the top of the reservoir. If fluid replacement is required, slowly add coolant to
the reservoir until the proper fill level is achieved.
6.2.3 Coolant Freeze Protection
For operation of unit at lower temperatures, the level of coolant freeze protection must be 14º C (25º F) below the
operating temperature. Operation at minimum of 0º C requires a freeze point not more than -14ºC (6.8º F).
6.2.4 Air Filters
Chillers incorporate three high-efficiency, reusable air filters. These should be inspected weekly during the first month
of operation to determine how frequently cleaning is necessary. Chillers located in dusty environments will require
more frequent filter cleaning.
IMPORTANT: Do not allow the air filters to become caked with dust. This significantly reduces air flow and can
compromise cooling efficiency. It can also lead to filter breakthrough, allowing dust to get into the condenser coils.
The Chiller’s air filters are removed and cleaned as follows:
1. Grasp the strap at the bottom center of the filter and gently lift up and away from the Chiller housing.
2. Using a water or high pressure air stream directed through the back of the air filter (the downstream side),
rinse/blow accumulated dust from the filter. Allow the filter to dry, as required.
3. Replace the filter by positioning the top edge of filter in the upper channel of the Chiller housing and then gently
lifting on the bottom strap while pushing the bottom edge of the filter toward the housing.