IM 915-13 • VISION - EXTENDED SIZES 20 www.DaikinApplied.com
Improper installation, use, or maintenance of water heating
coils can cause equipment damage. Read and follow
instructions carefully.
• Water supply and water return connections extend
through the end panel of the coil section. All connections
are labeled on the end panel.
• Water supply and water return connections are male NPT
iron pipe.
• When installing couplings, do not apply undue stress
to the connection extending through unit panel. Use a
backup pipe wrench to avoid breaking the weld between
the coil connection and header.
• Follow recommendations of the control manufacturer
regarding types, sizes, and installation of controls.
• Do not use hot water coils with entering air below 40°F.
• If fresh air and return air are to be heated by a hot water
coil, carefully design the system to provide thorough
mixing before air enters the coil.
• To prepare coils for winter operation, see See Removing
and Replacing Components on page 45.
Drain Pan Traps
Run drain lines and traps full size from the drain pan
connection. Install drain pan trap to allow condensate to drain
freely. On both blow-through and draw-through units, the trap
depth and the distance between the trap outlet and the drain
pan outlet must be twice the static pressure in the drain pan
section under normal operation so the trap remains sealed.
See Figure 34.
Figure 34: Allow Adequate Distance Between Trap Outlet
and Drain Pan Outlet
Pressure (P)
at the drain pan
2P
2P
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