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Purging the Heating Loop
System Schematics
p. 56
©Aqua-Hot®
125-GN1 Installation Manual REV 220427
Measuring Antifreeze Using a Refractometer
Measuring Antifreeze Using a Refractometer
Eye Piece
Properly Apply Antifreeze to the Prism Assembly
Use the guide below to properly apply the ethylene glycol
mixture to the prism assembly of the refractometer. Once that
is complete, peer through the eyeglass of the refractometer to
continue to the next step.
Adjust the Boundary Line
Once the glycol solution has been properly applied, adjust the
calibration screw until the boundary line labeled "Ethylene
Glycol" is set to 32°F. The graphic to the right has been designed
as an aid, but note that it may differ from what is shown in the
refractometer sight glass.
Application of Ethylene Glycol
Application of Propylene Glycol
Poor
Poor
Good
©Aqua-Hot®
125-GN1 Installation Manual REV 220427
Measuring Antifreeze
Appendix
Calibration Screw
Prism Assembly
Daylight Plate
Assembly
Refractometer Sight Glass
Upper Blue Field
Boundary Line
Adjust to 32°F
Lower White Field
p. 57
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