Bard WG421, Installation Instructions Manual

Manual 2100-365
Page  3

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 on Page 6.  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 air flow requirement of the
equipment.  Air Conditioning Contractors of America
(ACCA) is an excellent guide to proper sizing.

Refer to Table 9 for maximum static pressure
available for duct design.

AIR CONDITIONING MODULE OPTIONS

STD =

Standard equipment.

1

 CCM Compressor control module has adjustable 30 second to 5 minute delay-on-break

timer.  On initial power up, or any time the power is interrupted, the delay-on-make
will be 2 minutes plus 10% of the delay-on-break setting.  There is no delay-on-
make during routine operation of the unit.  The module also provides the lockout
feature (with 1 retry) for high and/or low pressure controls, and  a 2 minute timed
bypass for low pressure control.

2

 HPC  High pressure control is auto reset.  Always used with compressor control module

(CCM) which is included.  See note 

1

.

3

 LPC Low pressure control is auto reset.  Always used with compressor control module

(CCM) which is included.  See note 

1

.

4

 LAC Low ambient control permits cooling operation down to 0°F.

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