Winterizing Water Coils - Daikin SWP Series Installation Manual

Winterizing Water Coils

Coil freeze-up can be caused by such things as air stratification
and failure of outdoor dampers and/or preheat coils . Do not
depend on routine draining of water cooling coils for winter
shutdown or to protect against freeze-up . Severe coil damage
can result . Drain all coils as thoroughly as possible and then
treat each of them in the following manner:
• Fill each coil independently with an antifreeze solution
using a small circulating pump and thoroughly drain
again .
• Check the freezing point of the antifreeze before
proceeding to the next coil . Due to a small amount of
water always remaining in each coil, there is a diluting
effect . The small amount of antifreeze solution remaining
in the coil must always be concentrated enough to
prevent freeze-up .
IM 1032-2 • Self-Contained Air Conditioning System
Carefully read instructions for mixing antifreeze solution . Some
products have a higher freezing point in their natural state than
when mixed with water .
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