Greenheck Fan 470656 manual Flushing Coils

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		Percent of	Freeze Point
Ethylene			Propylene
Glycol	ºF	ºC	Glycol	ºF	ºC
by Volume			by Volume
0	32	0	0	32	0
10	25	-4	10	26	-3
20	16	-9	20	19	-7
30	3	-16	30	8	-13
40	-13	-25	40	-7	-22
50	-34	-37	50	-28	-33
60	-55	-48	60	-60	-51

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Model IG / IGX Make-Up Air 61