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Panasonic 140 Installation And Maintenance Manual
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1810.6. Frost protection10.6.1. Water loop glycolingCAUTION The use of a glycol-based solution is the only effective frost-protection meansThe glycol-based water solution must be sufficiently concentrated to ensure appropriate protection and prevent ice fromforming. Take precautions when using non inert MEG antifreeze solutions (Mono Ethylene Glycol) or MPG (Mono PropyleneGlycol). With this type of antifreeze solution, corrosion may occur in the presence of oxygen.Contact glycol resellers to ensure that its characteristics are compatible with environmental directives applicable on site (this isnot under manufacturer responsibility).CAUTIONGlycol concentration in the installation’s hydraulic circuit must be entered in the controller upon start-up.This parameter setting changes the safety and alarm triggering threshold limits. An incorrect value maycause malfunctions and potential destruction of the unit’s heat exchanger.AVERTISSEMENT It is strongly recommended to post, on the electric box of the unit, glycol type and concentration inthe hydraulic circuit.Glycoling the water loop worsens slightly the performances, in particular the pressure drops. The hereunder table givescorrective factors with respect of type and concentration of the glycol. For instance, the 20% MEG glycoling will:• Increase the pressure drop: with glycol = 1,160 x without glycol• Increase the flow rate: with glycol = 1,050 x without glycol• Decrease the capacity: with glycol = 0,985 x without glycolMono Ethylene Glycol concentration % 10 20 30 45Correction factorLoad loss 1,070 1,160 1,235 1,368Water flow 1,015 1,050 1,085 1,169Thermodynamic power 0,995 0,985 0,970 0,949Mono Propylene Glycol concentration % 10 20 30 45Correction factorLoad loss 1,112 1,175 1,290 1,520Water flow 1,005 1,030 1,067 1,162Thermodynamic power 0,991 0,977 0,945 0,894Draining the water circuit is not recommended for frost protection, for the following reasons:• The water circuit will rust, which will shorten its lifetime.• Water will remain at the bottom of the plate exchangers and freezing may cause damage.CAUTIONNever fill the hydraulic circuit with pure glycol. Maximum glycol concentration is 45%. The water and glycolmixture must be precisely prepared before filling the hydraulic circuit. If the mixture is too concentrated, thehydraulic circuit components may be damaged and the ECOi-W unit may not perform normally. In this case,unit warranty will be void.CAUTION For Heat pump models, if the outdoor temperature is likely to fall below +1°C, provide means to prevent thecondensates from freezing (e.g. heating cord).10.6.2. Outer air protectionIn case of negative temperatures, the water loop must be protected against icing when the unit is off. Concentration mustcomply with the temperature level:Minimum outer air temperature °C 5 > T > 0 0 > T > -5 -5 > T > -10 -10 > T > -27MEG concentration % 10 20 30 45MPG concentration % 10 20 30 45 |
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