Bard W24G3-A Installation Instructions Manual - Warning
Manual 2100-630A
Page
10 of 49
1. IMPORTANT
The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians. All duct work or portions thereof not in the
conditioned space should be properly insulated in order
to both conserve energy and prevent condensation or
moisture damage.
2. APPLICATION
This is a fan-assisted forced air gas furnace with electric
air conditioning for outdoor installation. A fan-assisted
furnace is equipped with an integral mechanical means
to draw products of combustion through the combustion
chamber and heat exchanger. The furnace installation
must conform with local building codes and ordinances
or, in their absence, with the National Fuel Gas Code
ANSI Z223.1 or CAN/CGA-B149.1, latest edition,
and the National Electrical Code ANSI/NFPA-7 or CSA
C22.1, latest edition. It is the personal responsibility
and obligation of the purchaser to contact a qualified
installer to assure that installation is adequate and is in
conformance with governing codes and ordinances.
3. DUCT WORK
The unit is designed for use with or without duct work
(see WARNING). Flanges are provided for attaching
the supply and return ducts. These instructions
explain the recommended method to install the air
cooled self-contained electric air conditioning and
gas heating unit and the electrical wiring connections
and gas piping to the unit. The refrigerant system is
completely assembled and charged. All internal wiring
is complete.
These instructions and any instructions packaged with
any separate equipment required to make up the entire
heating/cooling system should be carefully read before
beginning the installation. Note particularly “Starting
Procedure” and any tags and/or labels attached to the
equipment.
All duct work, supply and return, must be properly
sized for the design airflow requirement of the
equipment. Air Conditioning Contractors of America
(ACCA) is an excellent guide to proper sizing.
Refer to Tables 10, 11, 12, 13, 14 and 15 for maximum
static pressure available for duct design.
See Figure 3 and clearance information in Section 9
and Table 2 for additional information.
Design the duct work according to methods given by
the Air Conditioning Contractors of America (ACCA).
When duct runs through unheated spaces, it should be
insulated with a minimum of one-inch of insulation.
Use insulation with a vapor barrier on the outside of the
insulation. Flexible joints should be used to connect
the duct work to the equipment in order to keep the
noise transmission to a minimum.
A 1" clearance to combustible material for the first 3' of
duct attached to the outlet air frame is required. See
Wall Mounting Instructions and Figures 2, 2A, 3 and
3A for further details.
Ducts through the walls must be insulated and all joints
taped or sealed to prevent air or moisture entering the wall
cavity.
Some installations may not require any return air duct.
A metallic return air grille is required with installations
not requiring a return air duct. The spacing between
louvers on the grille shall not be larger than 5/8".
Any grille that meets with the 5/8" louver criteria may
be used. It is recommended that Bard Return Air Grille
or Return Filter Grille be installed when no return duct
is used. Contact distributor or factory for ordering
information. If using a return air filter grille, filters must be
of sufficient size to allow a maximum velocity of 400 fpm.
NOTE: If no return air duct is used, applicable
installation codes may limit this cabinet to
installation only in a single story structure.
WARNING
In all cases, there must be a metal duct
connection made to the supply air flange, and a 1"
clearance to combustibles must be maintained to
this duct connection.
For free blow applications, a metal sleeve must be
used in the wall opening itself, again maintaining
a 1" clearance to combustibles.
Failure to use the sheet metal can cause fire
resulting in property damage, injury, or death.
CAUTION
During the initial firing of the burners there will probably be some amount of smoke issued to the
circulating air stream as the result of residual oil burning off of the heat exchanger tubes. This oil
is required during the forming process of the stainless steel heat exchanger tubes to facilitate the
bending. OSHA or the National Toxicology Program does not list the oil as a carcinogen. In vapor
form this may be irritating to the eyes or could cause headaches. This is a one-time occurrence, and
ventilation of the space may be required depending upon the space being conditioned.