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Flushing Coils
Manufacturer recommends the use of inhibited glycol
(such as propylene or ethylene) to flush water coils
to protect against freezing. Additionally, the use of
inhibited glycol provides corrosion protection.
The table below indicates the percentage of glycol
required to prevent freezing in a coil at a given outdoor
air freeze point. Completely fill coil with solution. Drain
coil. Residual glycol fluid per these concentrations
can be left in the coil without concern of freezing.
Recovered fluid can be used to flush other coils.
Percent of
Freeze Point
Ethylene
Glycol
ºF
ºC
by Volume
0
32
0
10
25
-4
20
16
-9
30
3
-16
40
-13
-25
50
-34
-37
60
-55
-48
®
Percent of
Freeze Point
Propylene
Glycol
ºF
ºC
by Volume
0
32
0
10
26
-3
20
19
-7
30
8
-13
40
-7
-22
50
-28
-33
60
-60
-51
Model IG / IGX Make-Up Air
61
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