User Guide

ManualsBrandsAO Smith ManualsPlumbing Supplies597,000 BTU Commercial Indoor Tankless Rack System - Wall Mount (NG)

On-Demand Rack System • 3

GETTING STARTED

WARNING

Follow all local codes during installation.

In the absence of local codes, follow the

National Fuel Gas Code, ANSI Z223.1/

NFPA 54 (current edition) in the USA,

or in Canada, follow CAN/CSA B149.1,

Natural Gas and Propane Installation

Code (current edition). Failure to do

so may cause death, personal injury, or

property damage.

Product Registration

The rack system itself does not require

registration. However, each water

heater within the system should be

registered. To do so, fill out and

return the registration card for each

water heater. (Each water heater is

provided with its own manual and

registration card.) Alternatively, you

may register through the website

listed on the registration card.

General Information

The On-Demand Rack System includes

both wall-mounted and free standing

configurations, and several options are

available within each type. Refer to the

Specifications section.

For questions regarding general

operation, refer to the water heaters’

manuals.

Venting

Venting components are not supplied

with the rack system and must be

obtained separately. For venting

instructions, refer to the water

heaters’ installation manuals/owner’s

guides.

Installation

Requirements

• Observe the water heaters’

installa on requirements as outlined

in their installa on manual.

• Installa on and service must be

performed by a qualiﬁ ed service

professional, such as a licensed

plumber or gas ﬁ  er. Otherwise, the

warranty will be void.

• The installer is responsible for the

correct installa on of the water

heater and for compliance with all

code requirements.

• Place the water heaters in a loca on

that provides easy access for service

and maintenance.

• Do not Install the system in a pit or

loca on where gas and water can

accumulate.

• Do not allow the vent terminals to

point toward any opera ng window,

door, or opening into a building.

• Do not install the system next to any

source of airborne debris that can

cause debris to be trapped inside the

combus on chambers (unless the

system is direct vented).

• The power supply must be 120

VAC (60 Hz) and must be properly

grounded.

Indoor Models

• Do not install indoor models

outdoors.

• Due to safety concerns, a c

installa ons are not recommended.

If you install the system in an a c:

ᴏ

Make sure the water heaters will

have enough combus on air and

proper ven la on. Refer to the

installa on manual for the water

heaters.

ᴏ

Keep the area around the

water heaters clean. When dust

collects on the ﬂ ame sensors,

the water heaters will shut down

and produce an error code.

ᴏ

A drain pan, or other means

of protec on against water

damage, is required to be

installed under the water heaters

in case of leaks.

• It is recommended to direct vent the

water heaters.

• Ensure that the surrounding areas

are protected from poten al water

damage (i.e., condensate discharge,

etc.). In the absence of local codes

and regula ons,

it is recommended

that condensate be disposed of in a

standard drain.

Outdoor Models

• Do not install outdoor models

indoors.

• Outdoor models must be installed

only in an area with a mild,

temperate climate. Also, refer to

the water heaters’ manual for freeze

protec on informa on.

• Ensure that the installa on is in an

open, unroofed area with minimum

clearances observed.