Daikin RoofPak RPS Series Installation And Maintenance Manual page 43

Hot Water Coil Piping
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
Coils on page 108.
Hot water coils are provided without valves for field piping or
piped with three-way valves and actuator motors.
NOTE: All coils have vents and drains factory installed.
Hot water coils are not normally recommended for use with
entering air temperatures below 40°F (4°C). No control system
can guarantee a 100% safeguard against coil freeze-up. Glycol
solutions or brines are the only freeze-safe media for operation
of water coils at low entering air temperature conditions.
When no factory piping or valve is included, the coil
connections are 1.625" ODM copper on 800 and 802C, and
2.125" ODM copper on 047 and 077C.
With the factory piping and valve package, field piping
connections are the same NPT size as the valve with female
threading (see Figure 58).
Refer to the certified drawings for the recommended piping
entrance locations. Seal all piping penetrations to prevent air
and water leakage.
NOTE: Factory-installed water valves and piping are bronze,
brass, and copper. Dissimilar metals within the
plumbing system can cause galvanic corrosion. To
avoid corrosion, provide proper di-electric fittings as
well as appropriate water treatment.
Figure 57: Hot Water Heat Section (Shown With Factory
Valve and Piping)
www.DaikinApplied.com
CAUTION
Winterizing Water
Figure 58: Hot Water Valve Package
R e t u r n
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 60 on page
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 59: Steam Heat Section (Shown With Factory Valve
and Piping)
43 IM 926-3 • ROOFPAK APPLIED SYSTEMS
Mechanical Installation
B y p a s s
S u p p l y
44).