Steam Coils - Daikin Destiny VFD Series Installation And Maintenance Manual

Steam Coils

(provided as Specials only)
Steam coil connection guidelines are listed below. Also, refer to
Figure 17.
1. All steam coils are non-distributing (freeae) type. They
are not designed to be used in 100% OA applications.
2. Steam supply and steam return connections are
typically male NPT iron pipe and are labeled on the end
panel of coil section. Connections extend through coil
section end panel.
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. Support piping independently of coils and provide
adequate piping flexibility. Stresses resulting from
expansion of closely coupled piping can cause serious
damage.
5. Do not reduce pipe size at the coil return connection.
Carry return connection size through the dirt pocket,
making the reduction at the branch leading to the trap.
6. Install vacuum breakers on all applications to prevent
retaining condensate in the coil. Connect the vacuum
breaker between the coil inlet and the return main.
7. Do not drip supply mains through the coil.
8. Do not attempt to lift condensate when using modulating
or ON/OFF control.
9. Size traps in accordance with manufacturers'
recommendations. Be certain the required pressure
differential will always be available. Do not undersize.
10. Use float and thermostatic or bucket traps with low
pressure steam. On high pressure steam, use bucket
traps. Use thermostatic traps only for air venting.
11. Use bucket traps only with ON/OFF control.
12. Locate traps at least 12 inches below the coil return
connection.
13. Do not use modulating steam valves on high pressure
systems.
14. Size modulating valves properly. Do not undersize.
15. Destiny steam coils are not recommended for freezing
conditions or entering temperatures below 35°F (1.6°C).
IM 782-12 • DESTINY AIR HANDLERS
Figure 17: Steam Coil Connections (Type SS)
14
Installation
www.DaikinApplied.com