Reznor B Unit Installation Manual - Manual (Page 4)

Form I-F/B, P/N 98126 R21, Page 4
When units are located in the center of the space to be heated, the air should be dis-
charged toward the exposed walls. In large areas, units should be located to discharge
air along exposed walls with extra units provided to discharge air in toward the center
of the area.
At those points where infiltration of cold air is excessive, such as at entrance doors and
shipping doors, it is desirable to locate the unit so that it will discharge directly toward
the source of cold air from a distance of 15 to 20 feet (4.6-6.1M).
Units should not be installed closer than 18 inches (457mm) from any wall.
CAUTION: Do not locate the heater where it may be exposed
to water spray, rain or dripping water.
2. Unit Heater
Location
(cont'd)
3. Uncrating and
Preparation
3.1 Uncrating and Inspecting
This unit was test operated and inspected at the factory prior to crating and was in
operating condition. If the heater has incurred any damage in shipment, document the
damage with the transporting agency and immediately contact your Reznor Distribu-
tor.
Check the rating plate for the gas specifications and electrical characteristics of the
heater to be sure that they are compatible with the gas and electric supplies at the
installation site.
3.2 Preparing the Heater for Installation
Read this booklet and become familiar with the installation requirements of your par-
ticular heater. If you do not have knowledge of local requirements, check with the local
gas company or any other local agencies who might have requirements concerning
this installation. Before beginning, make preparations for necessary supplies, tools,
and manpower.
Check to see if there are any field-installed options that need to be assembled to the
heater prior to installation. Each of the option packages includes a list of components
and step-by-step instructions. For a brief description of optional hanger kits, refer to
Paragraph 5.2.1. Other option kits that should be installed prior to installation include
louvers, nozzle kits, polytube adapter, duct flange, guards, vent damper, power ven-
2.2 Combustion Air
Requirements
for a Heater
Located in a
Confined Space
Do not install a unit in a confined space without providing wall openings leading to and
from the space. Provide openings near the floor and ceiling for ventilation and air for
combustion as shown in FIGURE 1, depending on the combustion air source as noted
in Items 1, 2, and 3 below the illustration.
Add total BTUH of all appliances in the confined space and divide by figures below for
square inch free area size of each (top and bottom) opening.
1. Air from inside the building -- openings 1 square inch free area per 1000 BTUH.
Never less than 100 square inches free area for each opening. See (1) in FIGURE 1.
2. Air from outside through duct -- openings 1 square inch free area per 2000
BTUH. See (2) in FIGURE 1.
3. Air direct from outside -- openings 1 square inch free area per 4000 BTUH. See
(3) in FIGURE 1.
FIGURE 1 - Confined
Space: A space whose
volume is less than
50 cubic feet per 1000
BTUH of the installed
appliance input rating
(3)
(3)
(1)
(1)
(2)
(2)
Confined
Space
2.1 General (cont'd)
NOTE: For further details on supplying combustion air to a confined space, see the
National Fuel Gas Code ANSI Z223.1a (latest edition ).