IM 1287-6 • REBEL APPLIED ROOFTOP 44 www.DaikinApplied.com
Hot Water or Hot Water Integral Face
and Bypass (IFB)
CAUTION
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 Applied.
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 eld 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 conguration. 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 ttings as
well as appropriate water treatment when making
a connection to a pipe that is not copper, bronze or
brass.
A factory provided oor knockout location is provided on
every unit equipped with a hot water coil. Refer to the certied
drawings for the recommended piping entrance locations. Seal
all piping penetrations to prevent air and water leakage.
Table 4: Hot Water Connection Size
Hot Water Connections
B & C
Cabinet
1 Row 1-1/2"
2 Row 2-1/2”
The contents of Table 4 show the connection piping sizes
based on the coil selection. Valve package connections
are F-NPT and therefore will require a tapered pipe eld
connection (M-NPT). Header connection points are cup ttings
and therefore will require a straight pipe connection (M-SWT).
Piping
On the oor panel behind the drain pan are a series of corner
punches in the panel, as shown in “C-Cabinet Floor Marking
(Piping)” on page 45. When connected, this will form a safe
area to run piping through.
NOTE: Field-installed piping must be supported by the
building structure. Field-installed piping should not be
allowed to hang from the valves or be supported by
the cabinet oor.
An alternative method is to continue the valve package piping
and run the piping straight through the wall panel. Be sure to
properly insulate exposed piping based on your geographical
location.
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