Evcon DGAM056BDD User manual

INSTALLATION INSTRUCTIONS
DLAS MODELS
(No Coil Cabinet)
DGAT & DGAM MODELS
(With Built--In Coil Cabinet)
For Installation In:
1. Manufactured (Mobile) Homes
2. Recreational Vehicles & Park
Models
3. Modular Homes & Buildings
SEALED COMBUSTION
DOWNFLOW GAS FURNACES
Forced Draft with Direct Ignition (Hot Surface)
FURNACE SET---UP CHECK LIST
IMPORTANT: ONLY INDIVIDUALS HAVING PROVEN EXPERIENCE WITH THIS TYPE OF EQUIPMENT
SHOULD ATTEMPT TO PERFORM SET-- UP.
-HAS ROOF JACK CROWN BEEN CORRECTLY
INSTALLED?
-HASFURNACEGASVALVEANDBURNERORI-
FICE BEEN CORRECTLY CONVERTED FOR L.P.
GAS WHERE APPLICABLE?
-HASFURNACEGASVALVEBEENDE---RATED
FOR ALTITUDES ABOVE 2000 FEET WHERE
APPLICABLE?
-IS GAS LINE OUTLET PRESSURE PROPERLY
SET FOR FUEL TYPE? (NATURALGASIS3.5”
W.C.; L.P. IS 10” W.C.)
-IS PRIMARY AIR PROPERLY ADJUSTED PER
INSTALLATION INSTRUCTIONS?
-IS CROSS---OVER DUCT INSTALLED PER
HOME BUILDER AND EVCON INSTALLATION
INSTRUCTIONS?
-HAS FURNACE BEEN OPERATED THROUGH A
COMPLETE HEATING CYCLE?
IMPORTANT: PROPER FURNACE SET-- UP AND ADJUSTMENT IS THE RESPONSIBILITY OF THE
RETAILER/HOMEOWNER AND IS NOT COVERED UNDER WARRANTY.

2
TABLE OF CONTENTS
GENERAL SPECIFICATIONS AND INSTRUCTIONS 4.......................
FURNACE SPECIFICATIONS 5...........................................
INSTALLATION STANDARDS 6...........................................
Comply with Local Codes 6......................................................
HIGH ALTITUDE INSTALLATIONS 6...............................................
MINIMUM FURNACE CLEARANCES 6............................................
RETURN AIR REQUIREMENTS 7.................................................
CLOSET INSTALLATIONS 7......................................................
Furnace to Closet Door Clearance — Greater than 6 Inches 7........................
Additional Requirements 7.......................................................
Floor or Ceiling Return Air System 7..............................................
SPECIAL CLOSET INSTALLATIONS 8.............................................
Furnace to Closet Door Clearance — Greater than 1 Inch and Less than 6 Inches 8....
Furnace to Closet Door Clearance — Less than 1 Inch 8............................
AIR DISTRIBUTION SYSTEMS 9..................................................
ROOF JACKS 10.........................................................
Locating and Cutting Roof Jack Opening 10........................................
Installing Roof Jack in Roof 10....................................................
CEILING RINGS 12..............................................................
DUCT CONNECTORS 12.........................................................
TEMPLATE & CUTOUT DIMENSIONS 12...........................................
DLAS SERIES FURNACES 13.............................................
Installation Procedure for DLAS Furnace 13.........................................
DGAT & DGAM SERIES FURNACES 14....................................
Installation Procedure for DGAT & DGAM Furnaces 14...............................
CONNECTING ROOF JACK TO FURNACE 15...............................
VENT SYSTEM INSTALLATION INSTRUCTIONS 16.........................
EXISTING FURNACE REPLACEMENT 16...........................................
NEW HOME INSTALLATION 16....................................................
INSTALLATION IN SNOW REGIONS 16.............................................
ELECTRICAL WIRING 17.................................................
CONNECT ELECTRICAL POWER AND CONTROLS 17...............................
WALL THERMOSTAT 17..........................................................
THERMOSTAT WIRING FOR DGAT AND DGAM SERIES 18..................
THERMOSTAT WIRING FOR DLAS (HEAT ONLY) SERIES 19.................
WIRING DIAGRAMS 20...................................................
Wiring Diagram for DGAT Series 20................................................
Wiring Diagram for DGAM Series 21...............................................
GAS PIPING 22..........................................................
INSTALLATION AND CHECKING OF GAS LINE 22...................................
Observing Burner Operation 22...................................................
Combustion Air 22...............................................................

3
If Furance Fails to Operate Properly 24.............................................
FINAL PROCEDURE 24...................................................
Install Furnace Doors 24..........................................................
Finish and Trim 24...............................................................
Furnace and Air Conditioner Installations 24........................................
MANUFACTURED HOUSING DERATION CHART 25.........................
PROPANE 25....................................................................
NATURAL GAS 25...............................................................
REPAIR PARTS 26........................................................

4
LIST OF FIGURES
Figure 1 — Furnace Dimensions 4................................................
TABLE 1 — Furnace Specifications 5.............................................
TABLE 2 — Electrical Specifications 5.............................................
TABLE 3 — Minimum Clearances 6...............................................
Figure 2 — Alcove Installation 6..................................................
Figure 3 — Closet to Door Clearance — 6” or greater 7.............................
Figure 4 — Furnace to Closet Door Clearance — 1” to 6” 8..........................
Figure 5 — Furnace to Closet Door Clearance — Less than 1” 8.....................
Figure 6 — Air Distribution Systems 9.............................................
Figure 7 — Location of Roof Jack Opening 10.......................................
TABLE 4 — DLAS Roof Jacks 11..................................................
TABLE 5 — DGAT & DGAM Roof Jacks 11..........................................
Figure 8 — DLAS Models 11......................................................
Figure 9 — DGAT & DGAM Models 11.............................................
Figure 10 — Ceiling Rings 12.....................................................
TABLE 6 — Duct Connectors 12...................................................
Figure 11 — Duct Connector Dimensions 12........................................
Figure 12 — Template 12.........................................................
Figure 13 — Sub---base / Duct Connector 13........................................
Figure 14 — Duct Connector 14...................................................
Figure15—ConnectingRoofJacktoFurnace 15...................................
Figure 16 — Electrical Power & Controls 17.........................................
Figure 17 — Thermostat Wiring 18.................................................
Figure 17a — Thermostat Wiring 19................................................
Figure 18 — DGAT Series Wiring Diagram 20.......................................
Figure 19 — DGAM Series Wiring Diagram 21.......................................
Figure 20 — Natural Gas Flame Appearance 23.....................................
Figure 21 — Propane Gas Flame Appearance 23....................................
Figure 22 — Anti---Backflow Damper 24............................................

5
GENERAL SPECIFICATIONS AND INSTRUCTIONS
DGAT & DGAM SeriesDLAS Series
60 1/2”
76”
19---1/2”
9---3/4”
23”
24”
10---5/8”
19---1/2”
9---3/4”
23”
24”
10---5/8”
15---7/8”
15---7/8”
2”
1---7/8”
( o n S u b --- B a s e )
Figure 1 -- DLAS, DGAT, and DGAM Series Furnace Dimensions
WARNING
IMPROPER INSTALLATION, ADJUSTMENT, SERVICE
OR MAINTENANCE CAN CAUSE INJURY OR PROPER-
TY DAMAGE.
PLEASE REFER TO ALL THE INSTRUCTIONS OF THIS
MANUALFORPROPERINSTALLATIONPROCE-
DURES. IMPROPER INSTALLATION WILL VOID THE
WARRANTY.
THEFURNACESHALLBEINSTALLEDSOTHEELEC-
TRICAL COMPONENTS ARE PROTECTED FROM
WATER.
DO NOT TEST THE FUEL SYSTEM AT MORE THAN 14
INCHES WATER COLUMN AFTER FURNACE HAS
BEEN CONNECTED TO THE FUEL LINE. SUCH TEST-
ING MAY VOID THE WARRANTY. ANY TEST RUN
ABOVE 14 INCHES WATER COLUMN MAY DAMAGE
THE FURNACE CONTROL VALVE WHICH COULD
CAUSE AN EXPLOSION, FIRE, OR ASPHYXIATION.
IMPORTANT NOTICE
These instructions are intended for the use of qualified indi-
viduals specially trained and experienced in installation of
this type of equipment and related system components.
Installation and service personnel are required by some
states to be licensed.
Persons not qualified shall not install this equipment or
interpret these instructions.
NOTE
The words “Shall” or “Must” indicate a requirement which is
essential to satisfactory and safe product performance.
The words “Should” or “May” indicate a recommendation
or advice which is not essential and not required but which
may be useful or helpful.

6
FURNACE SPECIFICATIONS
TABLE 1 — Furnace Specifications
DGAM — Automatic ignition — with Built--in Coil Cabinet — 4 Ton -- A/C Ready
Model No. Factory Equipped for use with: Input/BTUH Output/BTUH
DGAM056BDD NATURAL GAS 56,000 46,000
DGAM075BDD NATURAL GAS 75,000 61,000
DGAT — Automatic Ignition — with Built-- in Coil Cabinet — 3 Ton -- A/C Ready
Model No. Factory Equipped for use with: Input/BTUH Output/BTUH
DGAT056BDD NATURAL GAS 56,000 46,000
DGAT070BDD NATURAL GAS 70,000 57,000
DGAT075BDD NATURAL GAS 75,000 61,000
DGAT090BDD NATURAL GAS 90,000 72,000
DLAS — Automatic Ignition — Heating Only — No Coil Cabinet
Model No. Factory Equipped for use with: Input/BTUH Output/BTUH
DLAS056BDD PROPANE 56,000 47,000
DLAS075BDD PROPANE 75,000 62,000
TABLE 2 — Electrical Specifications
Electrical Power Supply — 120 Volts — 60 Hz — 1 Phase
BreakerorFuse— 15 Amp
Thermostat Circuit — 24 Volt — 60 Hz — 40 VA
Nominal Anticipator Setting — .50
Gas Valve Inlet — 1/2”NFPT

7
INSTALLATION STANDARDS
Comply with Local Codes
The installer shall familiarize himself with and comply with
all local codes and regulations which govern the installation
of this appliance. Local codes and regulations shall take
precedent over these regulations where applicable. In lieu
of local codes, the appliance shall be installed in accor-
dance with:
In the U.S.A.:
the National Electrical Code, in accordance with rec-
ommendations made by the National Board of Fire Un-
derwriters, in accordance with the the American Na-
tional Standard Institute National Fuel Gas Code (Ansi
Z223.1/NFPA---54).
The installation must conform with:
local building codes,
Federal Manufactured Home Construction & Safety
Standard (H.U.D. Title 24, Part 3280),
or in the absence of local codes with:
American National Standard Mobile Homes A225.1 for
installation in mobile homes, and American National
S t a n d a r d ( A N S I --- C 1 / N F PA --- 7 0 ) f o r a l l e l e c t r i c a l w i r i n g ,
and American National Standard (A119.2/
NFPA---501C) for installation in recreational vehicles.
In Canada:
Manufactured (Mobile) Homes:
Unit installation shall comply with current CSA stan-
dard CAN/CSA---Z240.4.1 --- Installation Requirement
for Gas Burning Appliances in Mobile Homes.
Unit electrical wiring and grounding shall comply with
current standard CSA C22.1 --- Canadian Electrical
Code Part 1.
Recreational Vehicles:
Unit installation shall comply with current CSA stan-
dard CAN/CGA---Z240.4.2 --- Installation Requirements
for Propane Appliances and Equipment in Recreation-
al Vehicles.
Unit electrical wiring and grounding shall comply with
current CSA standard C22.2 No.148/CAN/CSA---
Z240.6.2 --- Electrical Requirements for recreational ve-
hicles.
HIGH ALTITUDE INSTALLATION
For elevation above 2,000 feet, derate furnace orifice
2% for each 1,000 feet of elevation above sea level. Der-
ating is accomplished by reducing the orifice size.
See Derating Chart for orifice size and output adjust-
ment.
MINIMUM FURNACE CLEARANCES
Access for servicing is an important factor in the location of
any furnace. A minimum of 24 inches should be provided in
front of the furnace for access to the heating elements and
controls. This access may be provided by a closet door or
by locating the furnace 24 inches from a facing wall or parti-
tion.
These furnaces are design certified for the following mini-
mum clearances from combustible material in alcove or
closet installation:
TABLE 3 — Minimum Clearances
CLOSET ALCOVE
BACK 0” 0”
SIDES 0” 0”
FRONT 6” 24”
TOP 2” 2”
ROOF JACK 0” 0”
DUCT 0” 0”
ALCOVE
20”
Minimum
23---1/2”
Figure 2
—
A
lcove Installation

8
RETURN AIR REQUIREMENTS
CLOSET INSTALLATIONS
Figure 3 — Closet to Door Clearance — 6” or greater
CLOSET
FURNACE
DOOR
6” or greater —
Closet to Door
Clearance
Furnace to Closet Door Clearance —
Greater than 6 Inches
The closet door MUST have a minimum of 250
Square Inches of free area in the upper half of the
door.
If the opening for return air is located in the side-
wall and below the top of the furnace casing:
a. total side return must equal or exceed
350 sq. in. free area
b. 6” min. clearance must be provided on
thesidewherethereturnislocated
Return Air Grille Part No.
7900--- 286P/A — Almond
7900--- 287P/A — White
Return Air Closet Door Part No.
7900--- 8881 — Almond
7900--- 7771/C — White
c. 6” min. clearance must be
maintained in front of the furnace.
Additional Requirements
Additional requirements for floor and ceiling return system
for closet installed sealed combustion heating appliance
are given in the next paragraph.
Floor or Ceiling Return Air System
Floor or ceiling return air system for closet installed direct
vent forced air heating appliance.
Listed in the next paragraph are the conditions to be met by
Mobile Home Manufacturers to have U.L. acceptance of
in---floor or ceiling return air systems of closet installed di-
rect vent forced air heating appliances for Mobile Homes to
be sold in the United States.
A. The return---air opening into the closet, regardless of
location, is to be sized not less than specified on the
appliance’s rating plate.
B. If the return---air opening is located in the floor of the
closet (versus the vertical front or side wall), the open-
ing is to be provided with means to prevent its inadver-
tent closure by a flat object placed over the opening.
C. The cross---sectional area of the return duct system
(when located in the floor or ceiling of the mobile home)
leading into the closet is to be not less than that of the
opening specified on the appliance’s rating plate.
D. The total free area of openings in the floor or ceiling reg-
isters serving the return---air duct system is to be not
less than 150% of the size of the opening specified on
the appliance’s rating plate. At least one such register
is to be located where likelihood of its being covered by
carpeting, boxes, and other objects is minimized.
E. Materials located in the return duct system have a flame
spread classification of 200 or less.
F. N o n --- c o m b u s t i b l e p a n s h a v i n g o n e --- i n c h u p t u r n e d
flanges are located beneath openings in the floor re-
turn duct system.
G. Wiring materials located in the return duct system con-
form to Article 300---22 (b&c) of the National Electric
Code (ANSI C1 / NFPA ---70).
H. Gas piping is not run in or through the return duct sys-
tem.
I. The negative pressure in the closet as determined by
test with the air---circulating fan operating at high heat-
ing speed and the closet door closed is to be not more
negative than minus 0.05---inch water column.
J. For floor return systems, the mobile home manufacturer
or installer shall affix a prominent marking on or near
the appliance where it is easily read when the closet
door is open. The marking shall read:
WARNING
HAZARD OF ASPHYXIATION
DO NOT COVER OR RESTRICT FLOOR OPENING
or equivalent.

9
SPECIAL CLOSET INSTALLATIONS
Furnace to Closet Door Clearance — Greater than 1 Inch and Less than 6 Inches
Figure 4 — Furnace to Closet Door Clearance
—
1” to 6”
As an option to the lower grill,
an undercut of 2 1/2” will provide
50 Sq. In. of free area.
Clearance — Greater than 1 Inch and
Less than 6 Inches
A. The closet door MUST have a minimum
of 250 Square Inches of free area in the
upper half of the door and a minimum of
50 Square Inches of free area in the low-
er area of the door.
The lower closet door grille may be
omitted if an undercut of 2 1/2 Inches is
provided in the door.
B. A fully louvered closet door MUST have
a minimum of 250 Square Inches of free
areaintheupperhalfofthedoor
.
Furnace to Closet Door Clearance — Less than 1 Inch
Figure 5 — Furnace to Closet Door Clearance
—
Less than 1”
Clearance — Less than 1”
The closet door MUST have three return air
grilles. The total free area of the two upper grilles
must be a minimum of 250 Square Inches. The
total free area of the lower grille MUST be a
minimum of 50 Sq. In.
NOTE: Each grille MUST BE ALIGNED directly
opposite the corresponding return air grille of
the furnace door.

10
AIR DISTRIBUTION SYSTEMS
For proper air distribution, the supply duct system shall be
designed so that the static pressure does not exceed the
listed static pressure rating on the furnace rating plate.
Three typical distribution systems are illustrated in
Figure 6.
Location, size and number of registers should be selected
on the basis of best air distribution and floor plan of the
home.
TheAirTemperatureRiseistobeadjustedtoobtainatem-
perature rise within the range(s) specified on the furnace
rating plate.
A
Single trunk duct
Dual trunk duct
Transition duct
*B
S1Crossover Duct must be centered directly under furnace.
S2Use 12” Diameter Round or equivalent insulated Flex---duct only.
S3Terminate Flex---duct (opposite furnace) in the center of the trunk duct.
S4Flex---duct material must be pulled tight — No Loops or unnecessary dips
— Air Flow may be impeded.
1
2
3
4
B*
Dual trunk duct with crossover connector
Crossover
C
Transition Duct with Branches
Branches
Figure 6
—
A
ir Distribution Systems

11
ROOF JACKS
CAUTION
Only use the appropriate roof jack.
See TABLE 4 & TABLE 5 for correct application.
Do not exceed the maximum height as determined from
TABLE 4 & TABLE 5. Installer should allow an addition-
al 1-- 1/2” travel before the flue pipe assembly is fully ex-
tended against the built--in stop. This provides an addi-
tional safeguard against the flue assembly being pulled
from the roof jack during transportation or other stress
conditions.
Improper installation may damage the equipment, can
create a hazard, and will void the warranty.
Carefully follow all instructions and warnings to avoid
Fire,Explosion,OrAsphyxiation.
Locating and Cutting Roof Jack Opening
To facilitate the proper installation of the roof jack, it is very
important that the roof jack opening in the ceiling and roof
be on the same vertical center line as the furnace flue collar.
SeeFigure7.
The dimensions shown in Figure 7 may be used if the fur-
nace is flush with the walls or adjusted to allow for anyspac-
ing away from either wall.
Mark this location on ceiling and scribe a circle with a 5” ra-
dius (10” diameter) around this mark. Cut opening for roof
jack through ceiling and roof. (If furnace was installed
during construction, cover furnace and flue opening to
prevent debris from entering flue and combustion air
when hole is cut for roof jack.)
9---3/4” 12--- 1/4”
Mark Center
Figure 7
—
Location of Roof Jac
k
Opening
TEMPLATE FRONT
These dimensions may be
used if furnace fits snug
against wall.
Installing Roof Jack in Roof
(See Figure 8 & Figure 9 for Dimensional requirements.)
Insert roof jack into opening in the roof.
The roof jack should be secured to the furnace before
roof flange (flashing) is secured to the roof. This will in-
sureabetteralignmentofthefluepipeandfurnacefluecol-
lar. Caulk completely around the underside of the roof jack
flashing to provide a rain tight seal, before securing roof
jack flashing to roof. After roof jack flashing has been
secured to the roof, caulk carefully all around swivel joint
with sealant supplied by furnace manufacturer.

12
TABLE 4 — DLAS Roof Jacks
Roof Jack Installation Dimensions
Model
Number ¡
Adjustable Height
4000--- 7121/C 75” to 86” These dimensions are
4000--- 7141/C ** 83” to 104”
T
h
e
s
e
d
i
m
e
n
s
i
o
n
s
a
r
e
from the floor to the
t
o
p
s
i
d
e
o
f
t
h
e
r
o
o
f
4000--- 7151/C ** 90” to 116” top side of the roo
f
.
(
S
e
e
F
i
g
u
r
e
8
.
)
4000--- 7171/C 127” to 157”
(
S
e
e
F
i
g
u
r
e
8
.
)
4000--- 8161/C *+ 85” to 101”
4000--- 8181/C *+ 99” to 129”
*These jacks have removable crowns.
Note: It is recommended that the 7900--- 6171 (17”) Interior
extension be used with these models. If used refer to TABLE 5
for sizing of roof jack.
** Available with 3 ---1/2, 12 Pitch Fixed Flashing.
Models 4000 ---6141 and 4000---6151
+Available with 3 ---1/2, 12 Pitch Fixed Flashing.
Models 4000 ---9161 and 4000---9181
TABLE 5 — DGAT & DGAM Roof Jacks
Roof Jack Installation Dimensions
Model
Number ¡
Adjustable Height
4000--- 7101/C 86” to 95” These dimensions
4000--- 7121/C 91” to 102”
T
h
e
s
e
d
i
m
e
n
s
i
o
n
s
are from the floor to
t
h
e
t
o
p
s
i
d
e
o
f
t
h
e
4000--- 7141/C ** 99” to 120” the top side o
f
the
r
o
o
f
.
S
e
e
F
i
g
u
r
e
9
.
4000--- 7151/C ** 106” to 132”
r
o
o
f
.
S
e
e
F
i
g
u
r
e
9
.
4000--- 7171/C 143” to 173”
4000--- 8161/C *+ 101” to 117”
4000--- 8181/C *+ 115” to 145”
*These jacks have removable crowns.
** Available with 3 ---1/2, 12 Pitch Fixed Flashing.
Models 4000 ---6141 and 4000---6151
+Available with 3 ---1/2, 12 Pitch Fixed Flashing.
Models 4000 ---9161 and 4000---9181
ROOF FLANGE IS ADJUSTABLE UP TO 23˚( 5 --- 1 2 P I T C H )
WARM AIR DUCTDUCT CONNECTOR
ROOF
76”
CAULK CAREFULLY ALL AROUND
SWIVEL JOINT WITH SEALANT
SUPPLIED BY FURNACE
MANUFACTURER.
IMPORTANT
SEAL ROOF JACK FLASHING TO THE
ROOF JACK AND ROOF.
THIS IS THE INSTALLER’S RESPONSIBIL-
ITY.
60---1/2”
WARM AIR DUCT DUCT CONNECTOR
FLOOR
FLUE
GASE
S
COMBUS-
TION
AIR
CAULK
UNDER
FLASHING The Bead or End of Upper Por-
tion of Roof Jack need Not ex-
tend below the ceiling.
(INCLUDES
SUB --- BASE)
19 1/2”
CAULK
UNDER
FLASHING
¡¡
FLUE
GASE
S
COMBUS-
TION
AIR
19 1/2”
Figure 8 — DLAS Models Figure 9
—
DG
A
T&DG
A
MModels
NOTE:

13
CEILING RINGS
The ceiling ring is to meet fire stop requirements.
Accessory Ceiling Ring (P/N 7660---2841) may be
used, (see Figure 10) or the mobile home manufactur-
er or the installer may use other approved methods to
stop fire.
If required, three (3) sections of Accessory Ring may be
used as shown in Figure 10B to provide closer clear-
ance around roof jack.
Figure 10 — Ceiling Rings
AB
DUCT CONNECTORS
The duct connector is designed for use on ducts down to
12” in width. When using the connector on smaller width
ducts, there will not be sufficient clearance to bend the tabs
on two sides of the duct connector.
In such cases the tabs may be attached to the sides of the
duct by using sheet metal screws or other suitable fasten-
ers. Holes for sheet metal screws are provided in three (3)
tabs on each side of the duct connector. If more than 3 tabs
need to be used to provide a more secure and air tight con-
nection, the remaining tabs can also be fastened to the
duct with screws after drilling the required screw holes.
If tape is used to provide a better air seal, it should be a type
approved by the applicable national or local codes.
TABLE 6 — Duct Connectors
Sales Package Part Number Depth
7681---6621 7681---602 2” Duct Connector — For Ducts 1---1/8” below top of floor surface
7681---6631 7681---603 3” Duct Connector — For Ducts 2---1/8” below top of floor surface
7681---6651 7681---605 5” Duct Connector — For Ducts 4---1/8” below top of floor surface
7681---6661 7681---606 6” Duct Connector — For Ducts 5---1/8” below top of floor surface
7681---6671 7681---607 7” Duct Connector — For Ducts 6---1/8” below top of floor surface
7681---6681 7681---608 8” Duct Connector — For Ducts 7---1/8” below top of floor surface
7681---6691 7681---609 9” Duct Connector — For Ducts 8---1/8” below top of floor surface
7681---6611 7681---611 11” Duct Connector — For Ducts 10--- 1/8” below top of floor surface
7681---6711 7681---612 12” Duct Connector — For Ducts 11--- 1/8” below top of floor surface
TEMPLATE & CUTOUT DIMENSIONS
14”
13---9/16”
11---9/16”
Duct Cutout
Dimensions
12”
NOTE:
Duct Connector may be used
positioned in any of four (4))
positions to fit duct.
Figure 11 — Duct Connector Dimensions
Casing Front
Door Front
15---7/8”
9---7/8”
12---1/4”
15---7/8”
1---13/16
9---3/4”
23”
1”
Floor Cut--- out Line
Flue Center
Duct
Locating
Hole
1---15/16”
Figure 12 — Template

14
DLAS SERIES FURNACES
Installation Procedure for DLAS Furnace
The following steps are listed for installation of furnace and
need not be performed in the exact order as listed.
Follow this procedure to avoid serious misalignment of fur-
nace duct connector opening and supply duct.
A. This Furnace requires a SUB-- BASE (Included)
For convenience, a template is provided on the furnace
shipping carton. This may be cut out and used to accu-
rately locate furnace, floor and vent openings. See
Figure 12.
Locate template on floor to provide proper clearances
to the walls and the front. Cut 2” diameter hole or small
square hole as indicated on template.
Locate template so that furnace opening outline is cen-
tered over under---floor supply duct as accurately as
possible. This is important because of the limited ad-
justment from side to side, and from front to rear of the
duct connector.
Locate under---floor duct through hole and center “floor
cut---out opening” on template over duct.
Accurately cut “floor cut---out opening” from template,
mark floor opening, remove template and cut floor on
outsideedgeofmarkedline.
Position sub---base over hole.
Duct connectors will fit openings of sub--- base in any one of
four (4) positions. Place proper duct connector in the open-
ing in the best position, (duct connector may be shifted in
either direction for best location).
Mark duct opening with a scribe or marking pen, then re-
move duct connector. Cut hole in duct to correct size ac-
cording to dimensions shown in Figure 11. Cut duct accu-
rately to prevent air leakage.
Reinstall duct connector with tabs inside of hole in the duct
and bend tabs up firmly against underneath side of duct.
Secure duct connector with four (4) sheet metal screws us-
ing holes provided in the connector, and the sub---base.
SeeFigure13.
Secure sub---base to floor with 2 or more screws or nails.
B. Install Furnace
Check to make sure roof jack is not extending too far
down into furnace location. Slide furnace into location
and align over floor opening.
Pre---cut openings and knock---outs are provided in
furnace base to install a front fuel line and/or front re-
frigerant lines. If rear entrance lines are to be used,
they must be installed before the duct connector is
installed and secured in place.
For air conditioning lines, remove the knock---out.
C. Securing Furnace
Make any minor adjustments in the furnace location
necessary to insure that the opening in the furnace bot-
tom is centered over the opening in the duct. Secure
furnace to sub---base, as required, through holes at
front and rear of furnace. Holes for screws are located
in bottom flange front corners and rear flanges.
Secure furnace to wall at top by using metal strap pro-
vided. (See Figure 13.)
Manufacturers may add straps equivalent to provided
straps, if required, for securing furnace to structural
member.
Secure Sub --- base
to floor firmly with 2
or more screws Or
nails.
Secure duct connector
to sub --- base with 4
screws.
Use screw holes in sub--- base
to fasten duct connector .
Bend tabs of duct
connector under duct
opening to secure to the
supply duct.
Secure sub --- base
to floor with 2 nails
or screws.
TABS TABS
DUCT DUCT
1.. Insert Duct Plenum Con-
nector Into Duct Cut--- out.
2.. Bend Bottom Tabs Over And Onto
The Underneath Duct Service.
For improved air
seal, duct
connector flanges
may be sealed to
the sub --- base with
aluminum duct
tape.
Figure 13 — Sub-- base / Duct Connector

15
DGAT & DGAM SERIES FURNACES
Installation Procedure for DGAT & DGAM
Furnaces
The following steps are listed for installation of furnace and
need not be performed in the exact order as listed:
Follow this procedure to avoid serious misalignment of fur-
nace duct connector opening and supply duct.
A. This Furnace requires NO sub-- base
For convenience, a template is provided on the furnace
shipping carton. This may be cut out and used to accu-
rately locate furnace, floor and vent openings. See
Figure 12.
Locate template on floor to provide proper clearances
to the walls and the front. Cut 2” diameter hole or small
square hole as indicated on template.
Locate template so that furnace opening outline is cen-
tered over under---floor supply duct as accurately as
possible. This is important because of the limited ad-
justment from side to side, and from front to rear of the
duct connector.
Locate under---floor duct through hole and center “floor
cut---out opening” on template over duct.
Accurately cut “floor cut---out opening” from template,
mark floor opening, remove template and cut floor on
outsideedgeofmarkedline.
Duct connectors will fit opening in any one of four (4) posi-
tions. Place proper duct connector in the opening in the
best position, (duct connector may be shifted in either di-
rection for best location).
Mark duct opening with a scribe or marking pen, then re-
move duct connector. Cut hole in duct to correct size ac-
cording to dimensions shown in Figure 11. Cut duct accu-
rately to prevent air leakage.
Reinstall duct connector with tabs inside of hole in the duct
and bend tabs up firmly against underneath side of duct.
Secure duct connector to floor with four (4) sheet metal
screws using holes provided in the connector. See
Figure 14.
B. Install Furnace
Remove panel from air conditioning compartment.
Check to make sure roof jack is not extending too far
down into furnace location. Slide furnace into location
and align over floor opening.
Pre---cut openings and knock---outs are provided in
furnace base to install a front fuel line and/or front re-
frigerant lines. If rear entrance lines are to be used,
they must be installed before the duct connector is
installed and secured in place.
For air conditioning lines, remove the knock---out.
C. Securing Furnace
Make any minor adjustments in the furnace location
necessary to insure that the opening in the furnace bot-
tom is centered over the opening in the duct. Secure
furnace to floor, as required, through holes at front and
rear of furnace. Holes for screws are located in bottom
flange front corners and rear flanges.
Secure furnace to wall at top by using metal strap pro-
vided. (See Figure 14.)
Manufacturers may add straps equivalent to provided
straps, if required, for securing furnace to structural
member.
SUPPLY DUCT
OPENING
Fuel Line
Opening
Use screw holes in furnace
base to fasten to duct con-
nector (relative to position of
duct connector) .
Secure furnace to duct
connector base with 4
screws.
Refrigerant
Line Opening
Furnace
Base
Bend tabs of
duct connector
under duct
opening to se-
cure to the
supply duct.
TABS TABS
DUCT DUCT
1. Insert Duct Plenum
Connector Into Duct
C u t --- o u t .
2. Bend Bottom Tabs Over
And Onto The Underneath
Duct Service.
Figure 14 — Duct Connector

16
CONNECTING ROOF JACK TO FURNACE
CAUTION
Theinnerfluepipemustbepresent.
It is mandatory that the combustion air pipe and flue
pipe assembly be fully engaged. The combustion air
pipe MUST be securely fastened to the furnace with
sheet metal screws in the holes provided.
Use 1/2” blunt or sharp end sheet metal screws to fasten
roof jack combustion air pipe to furnace combustion air
collar. Screw holes are provided in the pipe and collar.
Excessively long screws may extend to flue pipe and
puncture it. Screws are not to exceed 1 1/2”inlength.
NOTE
Combustion air tube and flue pipe are part of the same as-
sembly. Only the combustion air tube need be fastened to
the furnace.
1. Check to be certain that the flue pipe and combustion
air tube are present.
2. Pull the telescoping flue tube and combustion air tube
assembly down from the roof jack. Slide the flue tube/
combustion air tube assembly down firmly over the fur-
nace flue outlet and combustion air collar. Insure that
the back, side and front of combustion air tube collar
is fully engaged. Fasten the combustion air tube to the
furnace combustion air collar using two (2) 1/2inch
sheet metal screws. (Screw holes are provided in com-
bustion air tube and furnace combustion air collar.
(See Figure 15.)
It is mandatory that the combustion air and flue tube
assemblybefullyengagedatbacksidesandfront,and
combustion air tube securely fastened to the furnace
with sheet metal screws (2) in the screw holes pro-
vided.
COMBUSTION
AIR TUBE
FLUE PIPE
KSCREW
HOLES (2)
COMBUSTION
AIR TUBE COLLAR
K#8 OR #10
SCREWS RECOMMENDED
FURNACE
FLUE OUTLET
SECURE
STRAP
TO WALL
FRONT OF FURNACE
Figure 15 — Connecting Roof Jack to Furnace

17
IMPORTANT
VENT SYSTEM INSTALLATION INSTRUCTIONS
WARNING
FAILURE TO FOLLOW ALL VENTING INSTRUCT --
IONS CAN RESULT IN FIRE, ASPHYXIATION, OR
EXPLOSION.
The vent system is an important part of your furnace instal-
lation. Carefully read and observe the following basic
instructions, as well as those packed with the vent system.
EXISTING FURNACE REPLACEMENT
IF THIS FURNACE REPLACES AN EXISTING FURNACE,
DO THE FOLLOWING.
1. If a 2nd roof, roof cap or addition has been made to the
existing roof of the home, remove the old vent system
completely!... to avoid the possibility of an improp-
erly installed pipe or gaps in the old vent system,
INSTALL A NEW VENT SYSTEM. Your ceiling and
roof height will determine the correct vent system to
use. Refer to the vent selection table, of the furnace
installation instructions.
2. After unpacking the vent system, check the rain caps.
Insure they are not damaged, tilted or crooked. Do not
twist, crush or sit on the roof caps during installa-
tion. Damaged roof caps will cause improper furnace
operation. The furnace will not heat properly and could
result in explosion.
3. After installing vent pipe on furnace top collar, check to
make sure there is no gap in back or side between the
pipe collar and the furnace casing top.
4. Use only the pipes provided with the roof jack assem-
bly. Do not add to or adapt other sheet metal pipes. Do
not cut, insert or add other pipes to this assembly.
5. In no case should there be a gap between sections of
thefluepipeorthecombustionairpipe.
NEW HOME INSTALLATION
IF THIS FURNACE IS INSTALLED ON A NEW HOME DO
THE FOLLOWING
1. Inspect the furnace top collars for signs of insulation or
ceiling debris which might have fallen in during cutting
of the ceiling and roof holes. Remove all debris before
continuing.
2. After unpacking the vent system, check the rain caps.
Insure they are not damaged, tilted or crooked. Do not
twist, crush or sit on the roof caps during installa-
tion. Damaged roof caps will cause improper furnace
operation. The furnace will not heat properly and could
result in explosion.
3. Before inserting the vent pipe into the furnace top, in-
spect the furnace flue and combustion air opening for
debris or insulation which might have fallen in during
pre---installation steps. Do not proceed unless all de-
bris have been cleaned out or removed.
4. After installing vent pipe on furnace top collar, check to
make sure there is no gap in back or side between the
pipe collar and the furnace casing top.
INSTALLATION IN SNOW REGIONS
When the combustion air pipe inlet is covered or blocked
with snow, the furnace will not operate properly due to the
depleted combustion air supply.
Therefore, if the furnace will be located in regions where
snow accumulation on the roof exceeds 7” or in H.U.D.
Snow Load Zones, a # 7680B6541 roof jack extension is
recommended.

18
ELECTRICAL WIRING
CAUTION
TO INSTALLER: INCOMING POWER MUST BE PO-
LARIZED. OBSERVE COLOR CODING.
DANGER
-- SHOCK HAZARD --
DISCONNECT ELECTRICAL POWER SUPPLY TO THE
UNIT BEFORE SERVICING TO AVOID THE POSSIBIL-
ITY OF SHOCK INJURY OR DAMAGE TO THE EQUIP-
MENT.
CONNECT POWER SUPPLY WIRES
a. Remove the field wiring cover.
b. Insert 115 volt wires through the large plastic bush-
ing on the left side of the furnace ( See Figure 16).
If conduit is used it should be secured to the control
box.
c. Connect the “hot” wire to the BLACK pigtail lead,
and the “neutral” wire to the WHITE pigtail lead. Se-
cure all connections with suitable wire nuts and
wrap with electrical tape.
d. Connect the “ground” wire to the grounding screw.
e. Reinstall the control panel cover and secure
mounting screw.
CONNECT THERMOSTAT WIRES
a. Insert 24 volt wires through the small plastic bush-
ing just above the control panel.
b. Connect the thermostat wires to the furnace low
voltage pigtails (See Figure16).
c. Connect low ---voltage circuit to the wall thermostat
pigtails.
A separate 120 V.A.C. supply circuit must be used for the
furnace. The circuit should be protected by a 15 amp fuse
or circuit breaker.
Figure 16
This screw does not
need to be removed in
order to remove the
field wiring cover. (just
loosen).
NOTE:
Cover should
not be removed
except when
servicing the
controls.
WALL THERMOSTAT
Avoid locations where the thermostat could be subject to
drafts from outside, or exposed to direct light from lamps,
sun, fireplaces, etc., or affected by air from a duct register
blowing directly on the thermostat.
The wall thermostat should be mounted approximately 5
feet from the floor. The preferred location is on an inside
wall situated in an area with good air circulation, and where
the temperature will be reasonably representative of other
living areas the thermostat is controlling.

19
THERMOSTAT WIRING FOR DGAT AND DGAM SERIES
Figure17 -- Thermostat Wiring
White Green Black Red
Blend Air
Control Box
Condensing
Unit
Wall Thermostat Furnace Control Box
Not Factory Installed
White
Green
Black
Red
Yellow
White
Green
Red
Yellow

20
THERMOSTAT WIRING FOR DLAS (HEAT ONLY) SERIES
Wall Thermostat
(Rear View)
Furnace Control Box
Figure17a --- Thermostat Wiring for DL
A
SSeries
R
W
White
Green
Black
Red
Yellow
White
Red