18-CD20D3-18
3
Installer’s Guide
GENERAL INSTALLATION INSTRUCTIONS
The manufacturer assumes no responsibility for equipment
installed in violation of any code or regulation.
It is recommended that Manual J of the Air Conditioning
Contractors Association (ACCA) or A.R.I. 230 be followed in
estimating heating requirements. When estimating heating
requirements for installation at altitudes above 2000 ft.,
remember the gas input must be reduced (See GAS INPUT
ADJUSTMENT).
Material in this shipment has been inspected at the
factory and released to the transportation agency
without known damage. Inspect exterior of carton for
evidence of rough handling in shipment. Unpack
carefully after moving equipment to approximate
location. If damage to contents is found, report the
damage immediately to the delivering agency.
Codes and local utility requirements governing the installa-
tion of gas fired equipment, wiring, plumbing, and flue
connections must be adhered to. In the absence of local
codes, the installation must conform with latest edition of the
National Fuel Gas Code ANSI Z223.1 • National Installation
Code, CAN/CGA B149.1. The latest code may be obtained
from the American Gas Association Laboratories,
8501 E. Pleasant Valley Rd., Cleveland, Ohio 44131.
These furnaces have been classified as CATEGORY IV
furnaces in accordance with latest edition of ANSI Z21.47
standards • CAN/CGA 2.3. Category IV furnaces operate
with positive vent static pressure and with a flue loss less
than 17 percent. These conditions require special venting
systems, which must be gas tight and water tight. These
Category IV Direct Vent furnaces are approved for installa-
tion in Manufactured/Mobile housing when used with
BAYMFGH100A.
LOCATION AND CLEARANCES
The location of the furnace is normally selected by the
architect, the builder, or the installer. However, before the
furnace is moved into place, be sure to consider the following
requirements:
1. Is the location selected as near the chimney or vent and
as centralized for heat distribution as practical?
2. Do all clearances between the furnace and enclosure
equal or exceed the minimums stated in Clearance Table
on the Outline Drawings.
3. Is there sufficient space for servicing the furnace and
other equipment? A minimum of 24 inches front accessi-
bility to the furnace must be provided. Any access door
or panel must permit removal of the largest component.
4. Are there at least 3 inches of clearance between the
furnace combustion air openings in the front panel and
any closed panel or door provided?
5. Are the ventilation and combustion air openings large
enough and will they remain unobstructed? If outside
air is used, are the openings set above the highest snow
accumulation level? (See the Air for Combustion and
Ventilation section)
6. Allow sufficient height in supply plenum above the fur-
nace to provide for cooling coil installation, if the cooling
coil is not installed at the time of this furnace installation.
7. A furnace shall be installed so electrical components are
protected from water.
8. If the furnace is installed in a
residential garage
, it
must be installed so that the burners, and the ignition
source are located not less than 18 inches above the floor
and the furnace must be located or protected to avoid
physical damage from vehicles.
Installation Instructions
3
General Installation Instructions
3
Location and Clearances
3
Outline Drawing
4-5
Upflow Installation
6
Downflow Installations
6
Horizontal Installation
6
Air for Combustion and Ventilation
7
Duct Connections
8
Return Air Filters
9
General Venting Information
13
Venting Materials
15
High Altitude Derate
16
Horizontal Venting Through the Wall
17
Downward Venting
18
Venting Through the Roof
22
Venting Routed Through a Masonry Chimney
23
Electrical Connections
24
Field Wiring Diagrams
24-26
Condensate Drain Instructions
26
Gas Piping
28
Combustion and Input Check
29
Start-up and Adjustment
31
Preliminary Inspections
31
Lighting Instructions
31
Sequence of Operation
32
Control and Safety Switch Adjustments
32
Airflow Adjustment
32
Abnormal Conditions
33
IFC Error Flash Codes
35
Fault Code Recovery
35
Contents
IMPORTANT:
The furnace must be installed level. The only allowable variation
would be slightly to the left and/or forward in upflow installations
or slightly toward the front in horizontal installations. This is
necessary for proper condensate drainage.
▲
CAUTION
!
Do not install the furnace in a corrosive or contaminated
atmosphere. Failure to follow this warning could result in
early equipment failure.
▲
WARNING
!
Do not install the furnace directly on carpeting, tile or other
combustible material other than wood flooring. For vertical
downflow application, subbase (BAYBASE205) must be
used between the furnace and combustible flooring. When
the downflow furnace is installed vertically with a cased
coil, a subbase is not required.
