Lochinvar 800 - Manual (Page 29)

Installation & Operation Manual
29
4
Sidewall direct venting
(continued)
Sidewall termination – optional concentric vent: Models 399 - 600 Only
Multiventing sidewall terminations
When two (2) or more direct vent appliances are vented near
each other, each appliance must be individually vented (see
FIG. 4-12). NEVER common vent or breach vent this appliance.
When two (2) or more direct vent appliances are vented near
each other, two (2) vent terminations may be installed as shown
in FIG. 4-12. The next two (2) terminations must be at least 36
inches (914 mm) away from the first two (2) terminations. It is
important that vent terminations be made as shown to avoid
recirculation of flue gases. Dimension A in FIG. 4-12 represents
the distance between pipes or rain shields, as touching or a
2 inch (51 mm) maximum separation.
VENT
COMBUSTION
AIR
36"
(914 MM)
"A"
Figure 4-12 Concentric Vent and Combustion Air Termination Dimension A as
Touching or 2 inches (51 mm) Maximum Separation
COMBUSTION AIR
VENT
VENT
COMBUSTION AIR
STRAP
(FIELD SUPPLIED)
ELBOW
(FIELD SUPPLIED)
Figure 4-11 Concentric Vent Sidewall Attachment
DO NOT use field-supplied couplings to
extend pipes. Airflow restriction will
occur and may cause intermittent
operation.
9. Cement appliance combustion air and vent pipes to the
concentric vent termination assembly. See FIG. 4-11
for proper pipe attachment.
10. Operate the appliance one (1) heat cycle to ensure
combustion air and vent pipes are properly connected
to the concentric vent termination connections.
CAUTION