FloAire HOT WATER COIL MODULE - Manual (Page 9)

FLUID IOM
Blowing-Out Coils
1. 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).
2. Drain the coil by opening all drain valves and/or the drain plug. Remove the vent plug to
aid the draining process.
3. Once the coil has been fully drained, the blower can be hooked-up. Caps installed in the
piping on straight runs going to the supply and return connections are ideal points to
hook-up the blower. The air vent and drain plug are not suitable locations for hooking-
up the blower. Caution should be exercised when installing the blower. The blower
operator must take precautions to insure that water does not come into contact with any
7
a. Nuts and weld studs should be coated with thread lubricant.
b. Tighten all nuts per Figure 4 - Torque Pattern, to 35 ft-lb torque. After the initial torque
has been applied retorque them to 50 ft-lb, again using the pattern shown in Figure 4.
The permissible range of final torque values are as follows:
maximum torque: 53 ft-lb
design torque: 50 ft-lb
minimum torque: 47 ft-lb
c. Pressure test coils per the installation instructions.
d. After the coil has been leak tested and found to be free from leaks, let it sit for 24 hours.
Retorque to 50 ft-lb per Figure 4 - Torque Pattern.
e. Refill the coil per the operation instructions.
Figure 4 - Torque Pattern
Freeze Protection
During the winter, chilled water coils need to be protected against freezing. The two
predominant protective measures are covered below.