Unit Piping; Condensate Drain Connection; Hot Water Coil Piping - Daikin Rebel Applied DPSA Installation And Start-Up Manual

Unit Piping

Condensate Drain Connection

Drain pans must be cleaned periodically. Uncleaned drain pans can cause
illness. Cleaning should be performed by qualified personnel with an
alkaline based biodegradable cleaning solution.
The unit is provided with a 1.5ʺ male NPT condensate drain
connection. Refer to certified drawings for the exact location.
For proper drainage, level the unit and drain pan side to side
and install a P-trap
Units may have positive or negative pressure sections. Use
traps in both cases with extra care given to negative pressure
sections. In Figure 27, "P" is the static pressure at the drain
pan in inches W.C. As a conservative measure to prevent
the cabinet static pressure from blowing or drawing the water
out of the trap and causing air leakage, dimension A should
be two times the maximum static pressure encountered in
the coil section in inches w.c. or a minimum of 4 inches,
whichever dimension is greater. Dimension B should also have
a dimension of twice the maximum static pressure at the drain
pan or a minimum of 8 inches, whichever dimension is greater.
Draining condensate directly onto the roof may be acceptable;
refer to local codes. Provide a small drip pad of stone, mortar,
wood, or metal to protect the roof against possible damage.
If condensate is piped into the building drainage system, pitch
the drain line away from the unit a minimum of 1/8ʺ per foot.
The drain line must penetrate the roof external to the unit.
Refer to local codes for additional requirements. Sealed drain
lines require venting to provide proper condensate flow.
Where the cooling coils have intermediate condensate pans on
the face of the evaporator coil, copper tubes near both ends of
the coil provide drainage to the main drain pan. Check that the
copper tubes are in place and open before the unit is put into
operation.Check that this tube is open before putting the unit
into operation and as a part of routine maintenance.
Drain pans in any air conditioning unit have some moisture in
them, allowing micro-organisms to grow. Therefore, periodically
clean the drain pan to prevent this buildup from plugging the
drain and causing the drain pan to overflow.
Figure 27: Condensate Drain Connection
Static Pressure at
the drain Pan (P)
www.DaikinApplied.com
WARNING
A=
B=
(8" min)

Hot Water Coil Piping

Coil freeze possible when the ambient temperature is below 35°f and can
result in poor equipment operation or damage to the 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.
Hot water coils are not normally recommended for use with
entering air temperatures below 35°F (1.6°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.
NOTE: All coils have vents and drains factory installed.
Hot water coils are provided without valves as a standard
unit, requiring field installation of valves and piping. As an
option, the hot water coil is supplied with either a two-way or
three-way valve and actuator motor from the factory. Refer to
the submittal drawings to determine unit configuration. The
submittal drawing will also have information about the line size
connections.
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 dielectric fittings as
well as appropriate water treatment when making
a connection to a pipe that is not copper, bronze or
brass.
A factory provided floor knockout location is provided on
every unit equiped with a hot water coil. Refer to the certified
drawings for the recommended piping entrance locations. Seal
all piping penetrations to prevent air and water leakage.
Table 5: Hot Water Connection Size
B
Cabinet
(4" min)
23
Installation
CAUTION
Hot Water Connections
1 Row 2-1/2"
2 Row 2-1/2"
IM 1287 • REBEL APPLIED ROOFTOP