Steam Coil Piping - Daikin RDT-135c Installation And Maintenance Manual

Figure 52. Hot water heat section (shown with factory valve
and piping)
Figure 53. Hot water valve package
Coil freeze possible. Can damage equipment.
Follow instructions for mixing antifreeze solution used. Some
products have higher freezing points in their natural state than
when mixed with water. The freezing of coils is not the
responsibility of Daikin Applied. Refer to "Winterizing Water
Coils" on page 117.
IM 738-2
CAUTION
Mechanical Installation: Steam Coil Piping

Steam Coil Piping

Steam coils are provided without valves for field piping, or
piped with two-way valves and actuator motors.
The steam heat coil is pitched at 1/8" (3 mm) per foot (305
mm) to provide positive condensate removal. When no factory
piping or valve is included, the coil connections are 2.5" male
NPT iron pipe.
With the factory piping and valve package, the field supply
connection is the same NPT size as the valve with female
threading (see Figure 56 on page 46).
Refer to the certified drawings for the recommended piping
entrance locations. All piping penetrations must be sealed to
prevent air and water leakage.
Note: The valve actuator spring returns to a stem up position
upon power failure. This allows full flow through the
coil.
Figure 54. Steam heat section (shown with factory valve
and piping)
45