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776 North Oaklawn Avenue, Elmhurst, Illinois 60126 USA ph: +1-847-956-6420 | fx: +1-847-956-6595 | email: service@haskris.com
Operation and Maintenance
Haskris LX-Series, R-Series, WW-Series, OPC-Series
Section 7: Water Quality and Treatment – Outdoor Units
Section 7.1: Additives
• For outdoor operation, a mixture of potable distilled water and laboratory/food grade propylene or
ethylene glycol is required to resist freezing in the winter.
Section 7.2: Maintaining Water Quality
• Glycol solution should be changed periodically to maintain uid quality.
• The frequency at which the glycol solution should be changed depends on environmental
conditions.
• Periodically use a pH test strip to check pH. If pH level is outside the range of 7 to 10, change the
glycol solution. If pH is below 7, a line ush should also be performed.
• Periodically use a refractometer to check the glycol percentage.
• If glycol percentage needs to be increased, add pure glycol of the same kind used when the unit
was originally lled.
• If glycol percentage needs to be decreased, add potable distilled water.
Section 7.3: Wye Strainer
• Some units have a wye strainer on the return uid connection.
• Clean the wye strainer every time the glycol solution is changed or the return pressure has
increased 10psi or more.
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