A.O. Smith FPD SEALED SHOT Owner's Manual page 11

INSTALLATION OF VENT SYSTEM
THE SEALED SHOT WATER HEATER IS SPECIFICALLY
DESIGNED TO HAVE AN INTAKE VENTING ARRANGEMENT
AND AN EXHAUST VENTING ARRANGEMENT. THE INTAKE
VENTING ARRANGEMENT AND THE EXHAUST VENTING
ARRANGEMENT MUST BE INSTALLED TO RUN DIRECTLY TO
THE OUTDOORS AND NOT IN ANY WAY BE CONNECTED TO
ANOTHER VENTING SYSTEM (I.E. FURNACE, DRYERS, OR
SPACE HEATERS). IT IS CRUCIAL THAT THE VENTING
ARRANGEMENT BE KEPT SEPARATE FROM OTHER
VENTING SYSTEMS. IF THIS WARNING IS IGNORED, AND
THE SYSTEM IS VENTED INCORRECTLY, IT MAY CAUSE
IMPROPER OPERATION,
ASPHYXIATION.
1. Plan the route of the vent system from the discharge of the
blower to the planned location of the vent terminal. Layout
the total vent system to use the minimum of vent pipe and
elbows possible.
The unit consists of an exhaust vent and an intake vent.
Please review figure 14.
FIGURE 14
2. The sealed shot water heater allows the installer to add up
to a total of (80) EQUIVALENT feet of pipe for the venting
arrangements. The installer may add up to a MAXIMUM OF
WARNING
FIRE, EXPLOSION,
(40) EQUIVALENT feet of pipe to the exhaust venting
arrangement and may add up to a MAXIMUM OF (40)
EQUIVALENT feet of pipe to the intake venting arrangement.
This addition of (40) EQUIVALENT feet of pipe on both the
intake venting arrangement and exhaust venting arrangement
must include any 3 inch PVC elbows which equals (5)
EQUIVALENT feet of pipe. (DO NOT INCLUDE EXHAUST
TERMINAL AND INTAKE TERMINAL IN CALCULATION.)
EQUIVALENT FEET OF PIPE
EACH 90° ELBOW EQUALS FIVE (5) FEET OF PIPE
ONE 90° ELBOW+35 FT. OF PIPE = 40 EQUIVALENT FT.
TWO 90° ELBOWS+30 FT. OF PIPE = 40 EQUIVALENT FT.
THREE 90° ELBOWS+25 FT. OF PIPE = 40 EQUIVALENT FT.
THE INSTALLER MAY USE UP TO A MAXIMUM OF THREE - 3"
90 DEGREE ELBOWS IN THE INTAKE VENT ARRANGEMENT
AND UP TO A MAXIMUM OF THREE - 3" 90 DEGREE ELBOWS
IN THE EXHAUST VENTING ARRANGEMENT.
DO NOT ADD MORE THAN (40) EQUIVALENT FEET OF PIPE
TO THE INTAKE VENTING ARRANGEMENT OR THE EXHAUST
VENTING ARRANGEMENT. IF THE INSTALLER ADDS MORE
THAN (40) EQUIVALENT FEET OF PIPE TO EITHER THE
INTAKE VENTING ARRANGEMENT OR THE EXHAUST
VENTING ARRANGEMENT, THIS WILL INCREASE THE RISK
OF IMPROPER OPERATION, FIRE, EXPLOSION OR
ASPHYXIATION.
3. See section "VENT PIPE PREPARATION" for the proper
method of cutting and cementing the PVC pipe and fittings.
4. The blower discharge adapter is made to accept the rubber
coupling furnished with the unit. The coupling should be
mounted to the discharge of the blower and the clamp
tightened (a minimum of 15 in.lbs.) to secure the coupling.
To start off with an elbow, a short section of pipe (a minimum
OR
of 2.5 inches) must be cut and glued into the end of the elbow,
the other end of the pipe will then be secured in the coupling.
NOTE: This unit can be vented using only PVC (Class
160,ASTM D-2241 ; Schedule 40, ASTM D-1785 ; or Cellular
Core Schedule 40 DWV, ASTM F-891) , Schedule 40
CPVC(ASTM F-441), or ABS(ASTM D-2661) pipe. The
fittings, other than the TERMINATIONS should be equivalent
to PVC-DWV fittings meeting ASTM D-2665 (Use CPVC
fittings, ASTM F-438 for CPVC pipe and ABS fittings, ASTM
D-2661/3311 for ABS pipe). If CPVC or ABS pipe and fittings
are used, then the proper cement must be used for all joints,
including joining the pipe to the Termination Tee (PVC
Material). PVC Materials should use ASTM D-2564 Grade
Cement; CPVC Materials should use ASTM F-493 Grade
Cement; and ABS Materials should use ASTM D-2235 Grade
Cement.
NOTE: For Water Heaters in locations with high ambient
temperatures (above 100°F) and/or insufficient dilution air, it
is recommended that CPVC or ABS pipe and fittings (MUST
USE SUPPLIED VENT TERMINAL) be used.
5. An 1/8 inch bead of high temperature silicone should be
applied to the circumference of the discharge adapter, just
before installing the first section of pipe or elbow.
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WARNING
WARNING