35
5. Inst all rain cap and small diameter pipe assembly in Y concentric
tting and large pipe assembly. Ensure small diameter pipe is
bottomed and cemented in Y conc entric tting.
6. Secu re assembly to struc ture as shown in “Figure: 28” using
eld-supplied metal strap ping or equivalent support material.
NOTE: Ensure termination location cl earance dimensio ns are as
shown in the diagrams found in “Figure: 28” a nd Figure 29. W hen
extending the length of the 4” pipe, the added length beyond 21-1/8”
must be deducted from the maximum eq uivalent feet of vent pipe.
NOTE : If as semb ly nee ds to be exte nde d to all ow sid e wall thic kne ss
requirement, the 2 pipes supplie d in the kit may be replaced by
using same diameter, eld-supplied SD R-26 PVC (D2241) pipe. Do
not extend 21 1/8” (53.6 cm) dimension mo re than 60” (1.5 m). See
“Figure: 24”.
Do not use e ld- supp lie d coup ling s to ex tend pipes . Air ow restr ict ion
will occur and th e heater pressure switch may ca use intermittent
operation.
7. Ce ment heater combustion-air an d vent pipes to concentric vent
termination assembly. See Figure 29 for proper pipe at tachment.
8. Op era te hea ter th roug h 1 heat cycl e to ens ure co mbu stio n-a ir and
vent pipes are properly connected to concentric vent termination
connections.
Figure: 29MULTI-CONCENTRIC VENT TERMINATIONS
When two or more water heaters are direct vented with concentric
vent terminations near each other, each water heater must be
individually vented. NEVER common vent this water heater. When
two or more water heaters are direct vented using concentric
vent terminations, the water heaters may be vented as shown
in Figure 30 and Figure 31.
Figure 30: CONCENTRIC VENT TERMINATIONS FOR
HORIZONTAL DIRECT VENTING
Figure 31: CONCENTRIC VENT TERMINATIONS FOR VERTICAL DIRECT VENTING THROUGH A ROOF