Venting Through Closed Spaces
If the vent piping passes through a closed space, a minimum
clearance of 8” (20 cm) when installed horizontally, 6” (15 cm)
when installed vertically should be maintained between the vent
pipe and combustibles and noncombustibles. Be sure to follow
local codes and vent manufacturers installation instructions.
For maintenance and inspection purposes, the following access
panels are required.
l
Two (2) inspection access panels large enough to allow
access for venting inspection. One (1) of these access
panels should be close to where the vent pipe enters the
ceiling. The other access panel should be near the vent
termination.
l
A ventilation access panel with a 16 in
2
(103 cm
2
) opening
should be provided every 10 ft (3 m).
Appliance Vent Adapter
A UL 1738 approved stainless steel
appliance vent adapter is required for vent
connection.
Read the following instructions before
installation.
l
Test fit the adapter over the water
heater collar before proceeding. Adjust
clamp as needed.
l
With an alcohol wipe, clean inside
surface "A" of adapter and outside
surface of "B" of heater collar.
l
Apply 1/4" (6 mm) wide bead of high
temperature silicone (500°F) (260°C)
around outside of heater collar "B".
l
Slide adapter end "A" down over heater
collar "B" as far as it will go.
l
Tighten the clamp around the collar.
l
Inspect the inside of the adapter to
verify that the collar and adapter are
sealed. If more sealant is required,
apply sealant to a flat tool, then spread
around the collar edge on inside of
adapter.
NOTICE:
Follow the appliance vent
adapter manufacturer’s instructions
A
B
High Temp.
Sealant
Collar
Appliance
Vent Adapter
Clamp
Water Heater
Exhaust
Flow
B
A
Air
Intake
Draining the Condensate
Horizontal Venting
Provision should be made to collect and
dispose of condensate from venting
systems.
When a water heater is vented horizontally
the vent pipe should have a downward
slope towards the vent termination. The
vent should have a 1/4” per foot
DOWNWARD slope towards the vent
terminal as shown above.
If the air intake pipe or duct is connected
to the bottom of the air intake tee, a
condensate trap must be installed as close
as practical to the air intake tee to drain
any water which may enter the air intake
termination away from the heater. See the
Figure on the right.
Vertical Venting
In order to prevent condensate from
draining back into the water heater
installed in a vertical installation, a
condensate trap and drain must be
installed in a horizontal vent section (See
Figure on page 15), as close as practical to
the water heater. An UPWARD SLOPE
should always be used. always attach a
drain hose to the drain fitting and plumb
the hose to a sanitary sewer drain.
A high temperature silicon tubing suitable
for use with acidic condensate and
appropriate for the temperature range
should be used.
The drain tube is fashioned into a “pigtail”
trap and must be filled with water to
prevent flue gases from emitting into the
building prior to operating the appliance.
CAUTION: Condensate
must drain away from the
water heater and should
not be allowed to drain
back into any part of the
vent system.
10
Installing the water heater:
The water heater must be installed with an UL approved Category III Stainless Steel appliance vent adapter
and Paloma approved vent termination.
Air Intake
1/4” Per foot downward
slope towards termination
Inspection
Access
Panel #1
Vent Outlet Pipe
Inspection
Access
Panel #2
Ceiling
Board
WARNING: Failure to
provide a vent condensate
drain close to the appliance
could allow acidic flue gas
condensate to enter into
appliance flueways causing
premature failure of the
appliance.
CAUTION:Condensate
is known to be acidic; refer
to local, state (provincial)
or federal codes for proper
handling and discharge
methods.
CAUTION: Ensure
appliance vent adapter is
securely attached to the
water heater collar.
Fire Stop
Clamp
Collar
Exhaust
Flow
Air
Intake
Appliance
Vent
Adapter
High
Temp
Sealant
