Instructions / Assembly

Installing the water heater:
Venting Through Closed Spaces
Follow local codes and vent manufacturer’s installation instructions.
For maintenance and inspection purposes two (2) inspection access
panels large enough to allow access for venting inspection may be
required . One (1) of these access panels should be close to where the
concentric vent pipe enters the ceiling. The other access panel should
be near the vent termination.
downward slope
1/4" per foot
Ceiling
Vent Pipe
Wall Plates
Board
Inspection
Fire
Stop
Access Panel #1
Inspection
Access
Panel #2
94° Elbow
(optional)
(optional)
12” (min)
(30 cm)
Appliance Vent Adapter
Metal Fab Inc., standard concentric vent pipe
can be installed into the water heater collar
without an appliance vent adapter. However,
other Rheem approved vent manufacturer pipe
cannot be installed without a UL approved
Category III Stainless Steel appliance
concentric vent adapter.
Notice: To install the appliance vent adapter,
please follow the appliance vent adapter
manufacturer’s instructions.
Draining the Condensate
Provision should be made to collect and
dispose of condensate from venting systems.
When a water heater is vented horizontally,
the vent pipe can have a DOWNWARD or
UPWARD slope towards the termination. If an
UPWARD slope is used, always attach a drain
hose to the drain fitting and plumb the hose to
a sanitary sewer drain.
See Examples A and B on pages 13 and 14
for DOWNWARD and UPWARD slope for
horizontally vented water heaters.
When a water heater is vented vertically, an
UPWARD slope must always be used. See the
diagram on page 14 showing UPWARD slope
for vertically vented water heaters.
Always attach a drain hose to the drain fitting
and plumb the hose to a sanitary sewer drain.
A high temperature silicone 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. (see diagram)
CAUTION: Condensate
must drain away from the
water heater and should
not be allowed to enter the
water heater.
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
water heater.
CAUTION: Condensate
is known to be acidic; refer
to local, state (provincial)
or federal codes for proper
handling and discharge
methods.
10
WARNING: If the
condensate collector is not
used, the drain fitting must
be capped to prevent
exhaust gases and
condensate from entering
the building. The cap is
supplied on the water
heater.
Must be lled with water to prevent
gasses from backing into building
Condensate Drain Line
(to suitable drain)
AP15317 (10_09) DV Gas Manual 10 30 09.indd 10 11/9/2009 3:10:25 PM