Paloma PH-28c Indoor and Outdoor - Manual (Page 13)

Installing the water heater:
The water heater must be installed with a vent adapter such as 9401RHM or FSAA4 or a UL approved
Category III Stainless Steel equivalent.
Venting
The installation of venting must comply with
national codes, local codes, and the vent
manufacturer’s instructions.
The water heater must be vented to the
outdoors as described in these instructions.
DO NOT connect this water heater to a
Chimney. It must be vented separately from
all other appliances.
All vent components (adapters, pipe, elbows,
terminals, etc.) should be UL1738 Certified
Stainless Steel Venting Material
(e.g. AL29-4C).
The specified vent termination must be used.
The termination should be a 90° elbow type
with screen. (Refer to page 17)
Use a vent pipe with an anti-disconnection
structure.
The use of a High Temperature Silicone
(500°F) (260°C) may be required to seal vent
connections. To prevent accidental gas
exhaust leakage, apply a 1/4” (6 mm) wide
bead approximately 1/4” (6 mm) from the
end and another bead against the joint side of
the stop bead.
Follow vent manufacturer’s installation
instructions.
The unit can be vented either horizontally or
vertically.
Vent pipe runs must be adequately supported
along both horizontal and vertical runs.
The maximum recommended unsupported
span should be no more than five (5) feet
(1.5 m) Support isolation hanging bands
should be used. DO NOT use wire. (See
diagram below).
Notes on pre-existing vent:
If the water heater is being installed as a
replacement for an existing water heater, a
thorough inspection of the existing venting
system must be performed prior to any
installation work. Verify that the correct
materials, vent lengths and terminal locations
as detailed in this instruction manual have
been met. Carefully inspect the entire
venting system for any signs of cracks or
fractures, particularly at the joints between
elbows or other fittings and the straight runs
of vent pipe. Check the system for signs of
sagging or other stresses in the joints as a
result of misalignment of any components in
the system. If any of these conditions are
found, they must be corrected in accordance
with the venting instructions in this manual
before completing the installation and
putting the water heater into service.
DANGER: Failure to
install the vent adapter and
properly vent the water
heater to the outdoors as
outlined in the Venting
section of this manual will
result in unsafe operation of
the water heater causing
death, serious injury,
explosion, or fire. To avoid
the risk of fire, explosion,
or asphyxiation from
carbon monoxide, NEVER
operate the water heater
unless it is properly vented
and has adequate air supply
for proper operation as
outlined in the Venting
section of this manual.
WARNING: Use UL
approved Category III
Stainless Steel vent material
only. No other vent
material is permitted.
WARNING: Refer to
page 7 for clearances to
combustible material.
NO! YES!
Venting Lengths
MAXIMUM VENT LENGTH - The
system will not operate if there is excessive
restriction (pressure drop) in the venting
system. A maximum of 47 feet 6 inches
(14.4 m) of vent pipe may be used provided
there is only one 90° elbow in the system. If
additional elbows are required: two elbows
can be used with 42 feet 6 inches (13 m),
and three elbows can be used with 37 feet 6
inches (11.4 m) of vent pipe.
A 90° elbow is equivalent to 5 feet (1.5 m)
to straight pipe. A 45° elbow is equivalent to
2 feet 6 inches (76 cm) of straight pipe
.
The termination elbow does not count as an
elbow when determining total vent lengths.
The vent can be installed with a slight
downward slope of 1/4” per foot of
horizontal run toward the vent terminal (see
diagram below). This ensures that any
condensate formed during operation of the
unit is evacuated from the appliance.
A 1/4” per foot upward slope is acceptable
when it is not possible to vent with a
downward slope, however, a UL approved
Category III Stainless Steel condensate trap
MUST be installed at the beginning of the
horizontal run (See page 17 “Typical
Horizontal Termination
w/ 1/4” per foot UPWARD Slope” or
page 18, “Standard Vertical Vent
Termination” for examples).
MINIMUM VENT LENGTH - The
venting may be as short as 12” (30 cm),
provided one vent termination is installed to
the outdoors through a sidewall, one 90°
elbow is included in the installation, and the
wall thimble is installed.
Notice: Make sure that the seam of the vent
pipe in horizontal runs is toward the top of
the installation (see illustration to the far
left).
Max. 3 feet (91 cm)
Min. 3"
1/4" per foot
downward slope.
(8 cm)
Vent Seam
13
Number of
90° elbows
(bends)
Maximum
Length of
Straight Pipe
1
2
3
47’ 6”
(14.4 m)
42’ 6”
(13 m)
37’ 6”
(11.4 m)