2B. Installation Of Indoor Heaters; Combustion Air Supply; Figure; Typical Heater Installation With Base For Combustible Floors (Ex. A) - Natco VW Installation And Operating Instructions Manual

Concrete Slab Must Extend Out
A Minimum Of 12" On All Sides
(End View)
Base For Combustible Floors
Concrete Slab - 4" Minimum
Roof - Wood & Steel Construction
Add Base for Combustible Floors on Indoor Units.
Base Comes Standard on Outdoor Units.
Figure 2 – Typical Heater Installation with Base for
Combustible Floors, Example A
Mounting Platform Must Extend Out
A Minimum Of 12" On All Sides
Unit
(End View)
20 GA
Galvanized
Sheet Metal
Cap
Base For Combustible Floors
Roof
Raised Mounting
Platform (Wood)
Add Base for Combustible Floors on Indoor Units.
Base Comes Standard on Outdoor Units.
Figure 3 – Typical Heater Installation with Base for
Combustible Floors, Example B
Unit
(Front View)
Base Rail
Base for Combustible Floors
Roofing
Flashing
Figure 4 – Typical Heater Installation with Base for
Combustible Floors, Example C
Unit
Unit
Base
Unit
Base
Flashing
Roof
20 GA
Galvanized
Sheet Metal
Cap
4X4 Stringer
Base Must Extend Out
Min. 12" On All Sides
Of Heater Frame
Blocks must provide solid base and be
braced so they cannot slip out of place.
Air openings in blocks must be arranged
to provide unobstructed opening through
entire width or length of base.
Figure 5 – Installation on Concrete Blocks or Tile

2B. Installation of Indoor Heaters

1. Locate the water heater to provide adequate
clearance for inspection and service on all sides.
See Table I. We recommend minimums of
24" from front (for proper access to and
service of controls) and 18" at water connection
end. For alcove installation, see Figure 6.
2. Install the heater on a waterproof floor with an
adequate floor drain and a 6" minimum curb on
all four sides to protect the building if heater
repairs are required. The manufacturer will not
be held liable for any water damage in
connection with this heater.
2B-1. Combustion Air Supply
1. The heater location must provide sufficient air
supply for proper combustion and ventilation of
the surrounding area as outlined in the latest
edition of ANSI standard Z223.1, and any local
codes that may be applicable. Inadequate
combustion air supply may result in incomplete
combustion, sooting of the heat exchanger, and
Roof
unsafe operation of the heater.
2. In general, these requirements specify that
small
provided with two
air supply openings communicating
directly through the wall to outside air; one within
5
Metal Plate 20
Ga. Min.
Under Entire
Heater
Concrete Blocks Or Tile
Min. 7" High With 3" Min.
Air Openings
heater rooms should be
permanent