FloAire HOT WATER COIL MODULE User Manual
Page 10
FLUID IOM
Flushing Coils
1. Heatcraft recommends the use of inhibited glycol designed for HVAC applications for
corrosion protection. The use of uninhibited glycol has produced formicary corrosion in
copper tubing. The complete filling of water coils with an inhibited glycol solution for
freeze protection can be expensive. In some instances, it is more cost effective to flush
the coils with an appropriate concentration of inhibited glycol solution. Residual fluid
can be left in the coil without the threat of freeze damage provided the correct concen-
tration of inhibited glycol was used. The recovered fluid can then be used to flush other
coils. Select an inhibited glycol solution that will protect the coil from the lowest pos-
sible temperatures that can occur at the particular coil’s locality. The following tables
have been provided for your convenience.
8
2. Estimate the volume of the coil in gallons.
For 5/8” tubes (1.5” face tube spacing)
(finned height in inches)x(finned length in inches)x(# of rows)x 0.0011 = gallons
For ½” tubes (1.25” face tube spacing)
(finned height in inches)x(finned length in inches)x(# of rows)x 0.00083 = gallons
3. Isolate the coil from the rest of the system by closing the valves on both the supply and
return lines (gate valves in Figure 1 - Horizontal Airflow and Figure 3 - Vertical Air-
flow).
of the electrical components of the blower. Failure to do so may result in damage to the
equipment and serious injury.
4. Close the vent or drain plug on the header which the blower is connected and open the
drain valve or cap on the other header.
5. Operate the blower for 45 minutes and then check the coil to see if it is dry. A mirror
placed in the discharge will become fogged if moisture is present. Repeat this procedure
until the coil is dry.
6. Let the coil stand for several minutes then blow it out again. If water comes out, repeat
the blowing operation.
7. Leave all plugs out and drains open until the threat of freezing has passed.
1
Freeze points may vary from product to product.
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