i nstallation, operatron,
and maintenance instructions
HIGH-EFFICIENCY
DOWNFLOW/HORIZONTAL
INDUCED-COMBUSTION FURNACE
376B
Series A
Sizes 040
thrullS
NOTE: Remove the Energy Guide tag from the furpace
when the installation is complete.
NOTE; This is a highly specialized piece of equipment.
Before beginning the installation, READ THESE
INSTRUCTIONS CAREFULLY AND COMPLETELY.
INTRODUCTION
Before installing the furnace, refer to “Procedure for
Induced-Combustion Gas-Fired Furnaces” (packaged with
the equipment) for information concerning combustion,
venting, piping, and other standard installation practices.
Further reference is made to the current edition of the
National Fuel Gas Code NFPA No. 54-1984/ANSI Z223.1-
1984.
The induced-combustion vent system of this furnace is
designed to operate at zero or negative pressure at the vent
connector outlet. This furnace, therefore, complies with the
National Fuel Gas Code (NFPA No. 54-1984/ANSI Z223.1-
1984), Part 7.14.3.b. This furnace is also hsted by A.G.A. for
use with the type B1 gas vent, as described in the National
Fuel Gas Code, Part 7.3.2.
Each furnace is shipped from the factory completely assem
bled with multispeed direct-drive blower and wired ready for
indoor heating installation. All sizes feature a blower con
trol center with easy-to-read low-voltage terminal strip to
ensure proper connections.
The output capacity and any representations of efficiency
for this product are based on standard Department of
Energy test procedures. The insteJled operation may vary,
depending on installation, weather, or other factors.
Cancels; 39376DP5-A
40376DP5-B
9/1/85
TABLE I—CLEARANCES (In Inches)
Sizes
DOWNFLOW (In Alcove or Closet)
Sides—Single-Wall Vent
Type-B1 Double-Wail Vent 0
Back 0
Top
Front*—Single-Wall Vent 6
Type-B1 Double-Wall Vent
Vent—Single-Wail
Type-BI Double Wall 1
HORIZONTAL (In Alcove)
SidesT 0
Back
Top—Single-Wall Vent
Type-B1 Double-Wall Vent 0
Front*
Vent—Single-Wall
Type-BI Double-Wail 1 1
HORIZONTAL (In Closet)
Sides! 1 1 .
Back 3 3
Top—Single-Wall Vent 2
Type-BI Double-Wall Vent 2 2
Front*—Single-Wall Vent 6 6
Type-BI Double-Wall Vent
Vent—Single-Wall 6 6
Type-BI Double-Wall 1 1
♦Provide a 30-in. service clearance in front of the furnace,
t Indicates supply or return sides when furnace is in the horizontal
position.
040 and 055
3 “ 3
6 6
0 0
18 18
6 6
3 3
075 thrullS
A83215
Figure 2—Horizontal
0
0
0
1
6
1
0
2
The design of the downflow/horizontal gas-fired furnace is
A.G.A. certified for natural and LP(propane) gas and for
installation on combustible fiooring (with optional fioor
base), in alcoves, attics, crawl spaces, basements, closets, or
utility rooms. The design of this furnace line is not A.G.A.
certified for installation in mobile homes, recreation vehi
cles, or outdoors.
BDP Company
TABLE III—RATINGS AND PERFORMANCE*
SIZE Input
Buth*
024040
024055 67,000
036055
036075 90,000
048075 90,000
048095 114,000 95,000 55—85
060095 114,000
060115 137,000
*The-above gas inputs are certified for altitudes to 2000 ft. For elevations above 2000 ft,
tDetermined by U.S. Government tests.
tTentative rating.
48,000 39,000 50—80 0.10 610
67,000 56,000 35—65
Capacity
Buthtt
56,000
75,000 45—75 0.15
75,000
95,000
115,000 45—75 0.20
Temperature
Rise
Range
40—70
40—70
55—85
External Static
Installation comprises the following:
*1. Inspection
*11. Location, Ventilation, and Air for Combustion
*III. Gas Piping
*IV. Venting
V. Supply-Air Plenum Installation (Downflow)
VI. Attic Installation
VII. Crawl Space Installation
VIII. Filter Arrangement
IX. Sequence of Operation
Heating Cooling
Ft=/Min External Static
Pressure
0.12
0.12
0.15 1240
0.20
0.20
*To perform these sections (or installation steps), refer to
the appropriate sections of “Procedures for Induced-Com
bustion Gas-Fired Furnaces” booklet packaged with this
unit.
For accessory installation details, refer to applicable instal
lation literature.
V. SUPPLY-AIR PLENUM INSTALLATION (DOWNFLOW)
A. installation on a concrete slab
1. See Figure 3 for dimensions and location of supply-air
2. Construct hole in floor per dimensions in Figure 4 and
X. Electrical Connections
XI. Startup and Adjustment
XII. Care and Maintenance
3. Place plenum and furnace as shown in Figure 5.
B. Installation on a combustible floor
1. Read Installation Instructions packaged with combus
TABLE II—DIMENSIONS (In Inches)
Size
024040
024055
036055 14-3/1 6
036075 17-1/2
048075 17-1/2 1 5-7/8
048095 17-1/2 1 5-7/8
060095 21 19-3/8
060115 24-1/2 22-13/16
835t
1080
960t
1248
1350
1037 0.5 2010 1/2 P$C 208
reduce.input 4% for each 1000 ft above sea level.
A D
1 4-3/1 6
14-3/1 6 12-9/16
FCTMin
Pressure
0.5 Ш
0.5
0.5
0.5
0.5
0.5 ■ 1590
0.5 1929
12-9/16
12-9/16
1 5-7/8
890t
1157
1230t
1553
E Vent Conn
12-11/16 4
12-11/16
12-11/16
16
16
16
19-1/2
23
Motor
HP & Type
1/5 Páó
1/5 PSC 140
1/3 PSC 142
1/3 PSC 160
1/2 PSC 163
1/2 PSC
1/2 PSC 188
Shipping
Weight
<Lbs)
130
178
opening in furnace bottom.
Table IV.
tible floor base.
4
4
4
4
4
4
5
HOLE IN
FLOOR
Ì
Figure 4—Floor Opening for Concrete Slab
TABLE IV—OPENING DIMENSIONS
Furnace Casing
Width
14-3/16
17-1/2 16-7/16
21 1 9-7/8
24-1/2
*These dimensions apply when a Model 518A Evaporator Coil casing
is to be installed.
A
13-1/8
23-7/16
Heat-Oniy
19-5/8
19-5/8
19-5/8
19-5/8
В
Heat/Cooi*
20-15/16
20-15/16
20-15/16
20-15/16
—2-
Figure 7—Furnace, Plenum, and
Base Installed on a Combustible Floor
2. Cut and frame hole in floor per dimensions in Table I of
Installation Instructions packaged with combustible
floor base. If this requires cutting of a floor joist, tie
ends of cut joist into adjacent joists so that proper
floor support will be maintained.
3. Assemble and install combustible floor base per
instructions packaged with base.
4. When completed, combustible floor base, plenum, and
furnace (or coil casing when used) should be installed as
shown in Figure 7.
VI. HORIZONTAL ATTIC INSTALLATION
The 376B Furnace can be installed horizontally on either the
LH or RH side. A typical attic installation is shown in Fig
ure 8.
NOTE: The National Fuel Gas Code requires the use of a
type B1 vent in an attic or concealed space.
A. Construct a working platform.
1. Place working platform in location where all required
furnace clearances are obteunable. See Table I.
2. Use materials in platform that will support installer
and service persons.
3. Secure platform to building j oists.
LINE CONTACT ONLY PERMISSIBLE BETWEEN
LINES FORMED BY INTERSECTIONS OF
THE TOP AND TWO SIDES OF THE FURNACE
JACKET AND BUILDING JOISTS,
STUDS OR FRAMING.'
B. Install furnace
1. Position furnace in desired location.
2. Connect gas supply pipe. See Figure 8 for typical pip
ing entry. It is important to install a sediment trap in
the gas pipe riser.
3. Cormect supply- and return-air ducts.
a. Install field-supplied duct flanges as shown in Fig
ure 9.
b. Using appropriate fasteners for type of supply-air
duct being used, connect duct to furnace.
c. Install field-supplied filter retainers as indicated in
Figure 10 and Table V before connecting retum-air
duct to furnace.
NOTE: For ease of servicing, a return-air filter can be
installed in a common retum-air grille. The air velocity rat
ing must not exceed 300 ft/min for disposable filters. The air
velocity through permanent-type filters shall not exceed the
manufacturer’s recommendation.
d. Using appropriate fasteners for type of duct being
used, connect retum-air duct to furnace.
4. Install 24-x24-in. sheet metal shield on platform in
front of louvered control panel, as shown in Figure 8.
VII. CRAWL SPACE INSTALLATION
The 376B Furnace can be installed horizontally with either
the LH or RH side up. In a crawl space, the furnace can
either be hung from the floor joist or installed on suitable
blocks or pad. The furnace can be suspended from each cor
ner by hanger bolts (Four each 3/8-in. all-thread rod) cut to
desired length, 1 x 3/8 flat washer, 3/8 lockwasher, and 3/8
nut. Dimples are provided for hole locations. See Figure 3.
NOTE: Use Type B1 vent in a concealed space.
The crawl space installation is very similar to the attic;
therefore, refer to Division VI, Section B, steps 1, 2, and 3.
The installation of a sheet metal shield in front of the lou
vered control panel is covered in step 4. For a crawl space
installation, this same sheet metal shield must be installed
SEDIMENT TRAP'
A82178
Figure 8—Typical Attic Installation
—3-
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