Water Heating Coils; Drain Pan Traps - Daikin Destiny VFD Series Installation And Maintenance Manual

Water Heating Coils

Heating coil connection guidelines are listed below. Also, refer
to Figure 18 and Figure 19.
1. Water supply and water return connections extend
through the end panel of the coil section. All connections
are labeled on the end panel.
2. Water supply and water return connections are copper
sweat on units 002 through 010 and male NPT iron pipe
on units 015 through 030.
3. 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
coil connection and header.
4. Follow recommendations of the control manufacturer
regarding types, sizes, and installation of controls.
5. Hot water coils are not recommended for use with
entering air below 40°F.
6. If fresh air and return air are to be heated by a hot water
coil, take care in the design of the system to provide
thorough mixing before air enters the coil.
Figure 18: Water Heating Coil Connections
One and Two Row Coil
with Spayed Headers
Figure 19: Piping Arrangements
Steam main
12" min.
www.DaikinApplied.com
Vacuum breaker
1/2" check valve
Return main
15

Drain Pan Traps

Destiny air handlers have a drain pan connection on both
sides of the unit. Drain connections can be made on either
side or both sides. Drain lines and traps should run full size
from the drain pan connection. Drain pans should have traps
to allow condensate from coils to drain freely. The trap depth
and distance between the trap outlet and the drain pan outlet
should be twice the static pressure in the drain pan section
under normal operation for the trap to remain sealed. Refer to
Figure 20.
A secondary drain connection on the drain pan is standard on
all Destiny units. Secondary drain connections are required
in some applications as a visual means of identifying clogged
primary drain lines.
Figure 20: Allow Adequate Distance Between Trap Outlet
and Drain Outlet
Pressure (P)
at the drain pan
NOTE: The door panels on some applications have a close
clearance over the drain pipes. Extend the drain
fitting with a coupling if necessary for door clearance.
IM 782-12 • DESTINY AIR HANDLERS
Installation
2P
2P