54
PIPING AND WIRING FOR INDOOR UNIT
ENGLISH
Frost protection
In areas of the country where entering water temperatures drop below 0 °C, the water pipe must
be protected by using an approved antifreeze solution. Consult your AWHP unit supplier for
locally approved solutions in your area. Calculate the approximate volume of water in the system.
(Except the AWHP unit.) And add six liters to this total volume to allow for the water contained in
AWHP unit.
If you use frost protection function, change DIP switch setting and input the temperature
condition in Installation mode of remote controller. Refer to page 109 and 161.
Antifreeze type
Antifreeze mixing ratio
0 °C -5 °C -10 °C -15 °C -20 °C -25 °C
Ethylene glycol 0 % 12 % 20 % 30 % - -
Propylene glycol 0 % 17 % 25 % 33 % - -
Methanol 0 % 6 % 12 % 16 % 24 % 30 %
• Use only one of the above antifreeze.
• If a antifreeze is used, pressure drop and capability degradation of the system can be
occurred.
• If one of antifreezes is used, corrosion can be occurred. So please add corrosion inhibitor.
• Please check the concentration of the antifreeze periodically to keep same concentration.
• When the antifreeze is used (for installation or operation), take care to ensure that
antifreeze must not be touched.
• Ensure to respect all laws and norms of your country about Anti-freeze usage.
CAUTION
!