Sidewall Venting - Lochinvar 399 Installation And Service Manual

TABLE-D
DirectAire™ Kits
Input Horizontal
Btu/hr Kit*
399,999 SVK3047
500,000 SVK3047
650,000 SVK3048
750,000 SVK3048
990,000 SVK3040
1,260,000 SVK3041
1,440,000 SVK3041
1,800,000 SVK3041
2,070,000 SVK3041
*The SVK kits include a DV box adapter and sidewall air inlet cap. The VDK kits include
a DV box adapter and a rooftop air inlet cap.

3. Sidewall Venting

IMPORTANT: Before installing venting
system, follow all venting clearances and
requirements found in the Venting, General
Information section, page 11.
This option uses a powered vent assembly which pulls the flue
products out of the stack. This fan generates a negative draft at
the unit. Combustion air is drawn from the mechanical room
(see
FIG. 21 Sidewall Venting Installation with an Induced
Draft Fan and Sidewall Vent Cap
Sidewall Fan
The sidewall fan can be mounted on the inside/outside
(depending upon model) with a sidewall vent hood installed on
the exterior wall. The sidewall fan and accessories are included
Vertical
Kit*
VDK3026
VDK3026
VDK3027
VDK3027
VDK3023
VDK3024
VDK3024
VDK3024
VDK3024
, page 8).
Installation and
Service Manual
in a venting kit provided by the appliance manufacturer. See
TABLE–E for kit numbers.
The venting kit includes the sidewall fan, vent hood, tapered
vent adapter, barometric damper, proving switch and all
necessary relays to interlock with the heaters control system.
The tapered vent adapter reduces the vent size at the inlet to the
fan. There should be no reduction in vent diameter from the
unit's flue outlet to the sidewall fan. The barometric damper
must be installed on the flue and adjusted to supply a negative
draft within the range of 0.04 to 0.08 inches w.c. while unit is
operating.
Flue Outlet Piping
With this venting option, you must use Type-B double-wall (or
equivalent) vent materials. Vent materials must be listed by a
nationally-recognized test agency for use as vent materials.
Make the connections from the unit vent to the sidewall
fan/cap as direct as possible with no reduction in diameter. Use
the National Fuel Gas Code venting tables for double-wall vent
to properly size all vent connectors and stacks. Follow the vent
manufacturer's instructions when installing Type-B vents and
accessories, such as firestop spacers, vent connectors,
thimbles, caps, etc.
When planning the venting system, avoid possible contact with
plumbing or electrical wiring inside walls.
The maximum installed length of sidewall vent pipe with an
induced draft fan must not exceed 100 feet (30.5m). Subtract
5 feet (1.5m) for each 90° elbow. Subtract 2.5 feet (0.7m) for
each 45° elbow.
Sidewall Venting Termination
The sidewall vent cap must be installed on an exterior sidewall.
The sidewall fan/powered sidewall vent cap and accessories
are included in a venting kit which is furnished by the
appliance manufacturer in accordance with CSA International
requirements. This venting kit includes the powered sidewall
fan/cap, proving switch and all necessary relays to interlock
with the heaters control system.
The sidewall fan/powered vent cap must be interlocked with
the units control system to start the fan on a call for heat and
prove fan operation before the boiler fires. Plug-in and
terminal strip connections are provided on the unit for easy
connection of the factory supplied vent kit and control package
for the sidewall vent fan. See the installation instructions
provided with the vent kit.
Sidewall Venting Without Fan
For 399,999 - 750,000 Btu/hr models approved for sidewall
venting without an external power vent fan, you must install
specific vent kits and venting materials.
19