Intellihot iN199, Installation & Operation Manual

Page: 25 / 78

21 iN199 Air Intake Inlet and Exhaust Gas Outlet Pipe Connections
November 2021 - Revision 00
7.3.2 Multiple Units Configurations
When more than one unit is installed, refer to “7.6 Intake Air
Inlet and Exhaust Gas Outlet Pipe Diameter and Length” on
page 24.
Connecting multiple units together requires proper sizing of
the air intake inlet and exhaust gas outlet pipes. Up to four
water heaters can be cascaded together. Units which share
a common vent must be connected together in a cascading
configuration, as described in “13. Connecting Multiple Units”
on page 47.
The following diagrams represent some typical direct venting
configurations and are included to assist in designing the
vent system. Possible configurations are not limited to the
following diagrams.
Intake
Air
Intake
Air
Intake
Air
Exhaust
Exhaust
Exhaust
7.3.3 Side Wall Air Intake Inlet and Exhaust Gas
Outlet Pipe Termination
1. Terminate the air intake inlet pipe with a 90° elbow
(angled down). Use a flange and PVC screen (not
supplied).
2. Terminate the exhaust gas outlet pipe on the exterior wall
at least 12" above ground and at least 18" away from the
air intake inlet pipe, or as required by local building codes.
In areas of high snow fall, protect the vent terminations
from blockage. Use a flange and PVC guard.
IQ-020
Intake Air
Exhaust
18" - 36" is recommended
otherwise, use 72" or greate
r
Single unit.
IQ-020a
Exhaust
Intake Air
See Separa
tion Distance
Table Bel
ow
Multiple units.
Separation Distance Status
0 - 17.9" Not Allowed
18" - 36" Allowed
36.1" - 71.9" Not Allowed
72" or greater Allowed
3. To avoid moisture and frost build-up to openings on
adjacent structures, use 45° elbows, 90° elbows, or tees
for the vent termination to direct the exhaust gas fumes
away from the building.