MARS MG1E Series Installation Instruction

MG1 Series
INSTALLATION INSTRUCTIONS
Downflow, Direct Vent (Sealed Combustion)
Forced Air Gas Furnaces
For installation in:
• Manufactured Homes
• Recreational Vehicles, Park Models, &
Manufactured Buildings
• Modular Homes / Buildings
WARNING / AVERTISSEMENT
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could
result in serious injury, death or property damage.
• Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
• Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
RISQUE D’INCENDIE OU D’EXPLOSION
• Le non-respect des avertissements de sécurité pourrait
entraîner des blessures graves ou des dommages
matériels importants.
• L’installation et l’entretien doivent être effectués par
un installateur qualifié, un organisme de service ou le
fournisseur de gaz.
• N’entreposez pas ni n’utilisez de l’essence ni d’autres
vapeurs ou liquides inflammables dans le voisinage de
cet appareil, ni de tout autre appareil.
•
•
•
•
•
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electrical switch; do not use
any phone in your building.
Leave the building immediately.
Immediately call your gas supplier from a
neighbors phone. Follow the gas suppliers
instructions.
If you cannot reach your gas supplier, call the fire
department.
QUE FAIRE S’IL Y A UNE ODEUR DE GAZ
• N’essayez d’allumer aucun appareil.
• Ne touchez à aucun interrupteur électrique; n’utilisez
aucun téléphone dans le bâtiment.
• Évacuez l’immeuble immédiatement.
• Appelez immédiatement le fournisseur de gaz en employant
le téléphone d’un voisin. Respectez les instructions du
fournisseur de gaz.
DO NOT DESTROY. PLEASE READ CAREFULLY & KEEP IN A
SAFE PLACE FOR FUTURE REFERENCE.
CAUTION
HUD Manufactured Home Construction and Safety
Standards (3280.714) prohibit the use of noncertified
air conditioning or heat pump equipment with
this furnace. It is strongly recommended that
manufactured housing air conditioning components
from Nortek Global HVAC be selected to provide
a matched system specifically designed to meet
these requirements.
The cutting, splicing or modifying of any internal
electrical wiring may void product warranties and
create a hazardous condition. Failure to comply
with these standards could also provide inadequate
heating or cooling performance and cause structural
damage to a manufactured home.
Please contact your local distributor for help. A
directory of Nortek Global HVAC factory authorized
servicers is located in the furnace homeowner
packet.
Reference: HUD Manufactured Home Construction
and Safety Standards 3280.714.
TABLE OF CONTENTS
IMPORTANT SAFETY INFORMATION...................... 3
REQUIREMENTS & CODES...................................... 4
GENERAL INFORMATION......................................... 6
Minimum Clearances................................................ 6
Applications.............................................................. 6
Unit Location............................................................. 6
STARTUP & ADJUSTMENTS.................................... 20
Operating Instructions (Direct Ignition Furnaces)..... 20
How to Shut Off Gas - Direct Ignition Models........ 21
Verifying Input Rate.................................................. 21
Verifying & Adjusting Temperature Rise................... 21
Burner Adjustments.................................................. 21
Gas Pressure......................................................... 21
CIRCULATING AIR REQUIREMENTS....................... 7
Return Air.................................................................. 7
Supply Air................................................................. 7
OPERATING SEQUENCE.......................................... 22
Direct Ignition Furnaces............................................ 22
FURNACE INSTALLATION........................................ 7
General Information.................................................. 9
Locating & Cutting Duct Openings............................ 9
Standard Duct Connector Installation....................... 9
Alternate Attachment Method................................. 10
Round Duct Connector Installation........................... 10
Installing the Furnace............................................... 10
FURNACE CONTROLS & FUNCTIONS.................... 24
ROOF JACK INSTALLATION.................................... 10
Roof Jack Selection.................................................. 10
Locating & Cutting Roof / Ceiling Openings............. 12
Installing The Roof Jack........................................... 12
Installing Transit-Mode Venting System
(Before Home is Moved to Site)................................13
Removing the Transit-Mode Venting System
(After home is moved to site)....................................13
FIGURES & TABLES.................................................. 25
Gas Information........................................................ 25
Table 9. Gas Flow Rates........................................ 25
Table 10. Gas Pipe Capacities............................... 25
Table 11. Natural Gas Heating Values................... 26
Table 12. High Altitude Deration Chart for
Natural Gas - High Heating Value.......... 26
Table 13. High Altitude Deration Chart for
Natural Gas - Low Heating Value.......... 26
Table 14. High Altitude Deration Chart for
Propane Gas.......................................... 26
Electrical Information................................................ 27
Figure 32. Nordyne/UTEC Board Wiring
Diagram................................................ 27
Figure 33. Emerson Board Wiring Diagram........... 28
Airflow Data.............................................................. 29
Table 15. Heating Airflow (CFM) & Temperature
Rise (°F)................................................. 29
Table 16. Cooling Airflow (CFM)............................ 30
ELECTRICAL INFORMATION................................... 13
Line Voltage Wiring................................................... 13
Connecting Power Supply Wires............................ 14
Low Voltage Wiring................................................... 15
Connecting Thermostat Wires................................ 15
Verifying Anticipator Setting................................... 15
Grounding................................................................. 15
FUEL SUPPLY & PIPING........................................... 16
Leak Check............................................................... 17
Flue Gas Sampling................................................... 18
High Altitude Conversion.......................................... 18
Conversion to Propane (LP) Gas.............................. 19
Atmospheric & Direct Ignition Furnaces................. 19
Measuring the Supply Gas Pressure..................... 19
Measuring the Manifold Pressure.......................... 19
2
TROUBLESHOOTING................................................ 22
MAINTENANCE.......................................................... 24
Installer Information.................................................. 24
OPTIONAL ACCESSORIES....................................... 24
Optional Add-On Air Conditioning............................. 24
INSTALLATION CHECKLIST..................................... 32
IMPORTANT SAFETY INFORMATION
Safety markings are used frequently throughout this
manual to designate a degree or level of seriousness and
should not be ignored. WARNING indicates a potentially
hazardous situation that if not avoided, could result in
personal injury or death. CAUTION indicates a potentially
hazardous situation that if not avoided, may result in minor
or moderate injury or property damage.
WARNING:
The safety information listed below must be
followed during the installation, service, and
operation of this furnace. Failure to follow safety
recommendations could result in possible
damage to the equipment, serious personal
injury or death.
AVERTISSEMENT :
Les renseignements de sécurité indiqués
ci-dessous doivent être respectés pendant
l’installation, l’entretien et le fonctionnement
de cette fournaise. Le non-respect des
recommandations de sécurité peut causer des
dommages à l’équipement ou des blessures
graves, voire mortelles.
AVERTISSEMENT :
N’installez pas cette fournaise si l’une de ses
pièces a été immergée dans de l’eau. Une
fournaise endommagée par une inondation
est extrêmement dangereuse. Toute tentative
d’utiliser la fournaise peut entraîner un incendie
ou une explosion. Il faut communiquer avec un
organisme de service qualifié pour l’inspection de
la fournaise et le remplacement de toutes pièces
électriques ou parties du système de commande
qui ont été mouillées ou immergées.
CAUTION:
Operating gas furnaces in construction
environments can cause a variety of problems
within the furnace and may significantly
reduce the life or the performance of the
furnace. Therefore operating the furnace during
construction is not permitted and will void the
warranty.
3
REQUIREMENTS & CODES
• This furnace must be installed in accordance with
these instructions, all applicable local building codes
and the current revision of the National Fuel Gas Code
(NFPA54/ANSI Z223.1) or the Natural Gas and Propane
Installation Code, CAN/CSA B149.1.
• Use only with type of gas approved for this furnace.
Refer to the furnace rating plate.
• Install this furnace in accordance to the minimum
clearances to combustible materials listed in Table 1,
(page 6).
• Provide adequate combustion and ventilation air to the
furnace space as specified on page 7. Do not block
or obstruct air openings on the furnace, air openings
to the area where the furnace is installed, or the space
around the furnace.
• Combustion products must be discharged outdoors.
Connect this furnace to an approved vent system, as
specified on page 10.
• Never test for gas leaks with an open flame. Use
a commercially available soap solution to check all
connections. See page 17.
• This furnace is designed to operate with a maximum
external pressure rise of 0.3 inches of water column.
NOTE 1: The static pressure measurement should not
include the coil (if applicable). Consult the rating plate
for the proper circulating air flow and temperature rise.
NOTE 2: It is important that the duct system be designed
to handle the desired flow rate and external pressure
rise. An improperly designed duct system can result in
nuisance shutdowns, and comfort or noise issues.
• When supply ducts carry air circulated by the furnace
to areas outside the space containing the furnace, the
return air shall also be handled through the front door
of the furnace. Make sure there is sufficient return air
through the door. See return air connections page 7.
• Additional information listed below is for reference
purposes only and does not necessarily have jurisdiction
over local or state codes. Always consult with local
authorities before installing any gas appliance.
Combustion & Ventilation Air
• US: National Fuel Gas Code (NFGC), Air for Combustion and
Ventilation
• CANADA: Natural Gas and Propane Installation Codes
(NSCNGPIC), Venting Systems and Air Supply for Appliances
Duct Systems
• US and CANADA: Air Conditioning Contractors Association
(ACCA) Manual D, Sheet Metal and Air Conditioning
Contractors National Association (SMACNA), or American
Society of Heating, Refrigeration, and Air Conditioning
Engineers (ASHRAE) Fundamentals Handbook
Electrical Connections
• US: National Electrical Code (NEC) ANSI/NFPA 70
• CANADA: Canadian Electrical Code CSA C22.1
Gas Piping & Gas Pipe Pressure Testing
• US: NFGC and National Plumbing Codes
• CANADA: NSCNGPIC
4
General Installation
• US: Current edition of the NFGC and the NFPA 90B. For
copies, contact the National Fire Protection Association Inc.,
Batterymarch Park, Quincy, MA 02269; or American Gas
Association, 400 N. Capitol, N.W., Washington DC 20001 or
www.NFPA.org
• CANADA: NSCNGPIC. For a copy, contact Standard Sales,
CSA International, 178 Rexdale Boulevard, Etobicoke
(Toronto), Ontario, M9W 1R3 Canada
Safety
• US: (NFGC) NFPA 54–1999/ANSI Z223.1 and the Installation
Standards, Warm Air Heating and Air Conditioning Systems
ANSI/NFPA 90B.
• Federal Manufactured Home Constructions & Safety Standard
(H.U.D. Title 24, Part 3280.707[a][2])
• The Standard for Manufactured Home Installations
(Manufactured Home Sites, Communities, and Set-Ups) ANSI
A225.1 and/or CAN/CSA-2240 MH Series).
• American National Standard (ANSI-119.2/NFPA-501C) for
all recreational vehicle installations.
• CANADA: CAN/CSA-B149.1 and .2–M00 National Standard
of Canada. (NSCNGPIC)
• The Commonwealth of Massachusetts requires
compliance with regulation 248 CMR 4.00 and 5.00 for
installation of through – the – wall vented gas appliances
as follows:
1. For direct-vent appliances, mechanical-vent heating
appliances or domestic hot water equipment, where the
bottom of the vent terminal and the air intake is installed
below four feet above grade the following requirements
must be satisfied:
a.) A carbon monoxide (CO) detector and alarm shall be
placed on each floor level where there are bedrooms.
The detector shall comply with NFPA 720 (2005
Edition) and be mounted in the living area outside
the bedroom(s).
b.) A (CO) detector shall be located in the room that
houses the appliance or equipment and shall:
• Be powered by the same electrical circuit as the
appliance or equipment. Only one service switch shall
power the appliance and the (CO) detector;
• Have battery back-up power;
• Meet ANSI/UL 2034 Standards and comply with
NFPA 720 (2005 Edition); and Approved and listed
by a Nationally Recognized Testing Laboratory as
recognized under 527 CMR.
c.) A Product-approved vent terminal must be used, and
if applicable, a product-approved air intake must be
used. Installation shall be in strict compliance with the
manufacturer’s instructions. A copy of the installation
instructions shall remain with the appliance or
equipment at the completion of the installation.
d.) A metal or plastic identification plate shall be mounted
at the exterior of the building, 4 feet directly above
the location of vent terminal. The plate shall be of
sufficient size, easily read from a distance of eight
feet away, and read “Gas Vent Directly Below”.
Clearance
to Furnace
Cabinet
installed above
furnace door frame
to access roof jack
1
(457 8"
mm)
2. For direct-vent appliances, mechanical vent heating
appliances or domestic hot water equipment where the
bottom of the vent terminal and the air intake is installed
above four feet above grade the following requirements
must be satisfied:
a.) A (CO) detector and alarm shall be placed on each
floor level where there are bedrooms. The detector
shall comply with NFPA 720 (2005 Edition) and be
mounted in the living area outside the bedroom(s).
Nearest
b.) The (CO) detector shall:
Wall or
Partition or
• Be located in the room that houses the appliance
equipment;
• Be hard-wired, battery powered or both.
• Shall comply with NFPA 720 (2005 Edition).
c.) A product-approved vent terminal must be used, and
if applicable, a product-approved air intake must be
used. Installation shall be in strict compliance with the
manufacturer’s instructions. A copy of the installation
instructions shall remain with
themin.
appliance
or
Provide
235
cm 2 )
equipment at the completion sq.
of in.
the(1516
installation.
6" (152 mm)
Top Clearance
6" (152 mm)
Top Clearance
0" Side
Clearance
to Furnace
Cabinet
6" (152 mm)
Top Clearance
0" Side
Clearance
to Furnace
Cabinet
0" Side
Clearance
to Furnace
Cabinet
6" (152 mm)
Top Clearance
6" (152 mm)
Top Clearance
0" Side
Clearance
to Furnace
Cabinet
0" Side
Clearance
to Furnace
Cabinet
(1526"
mm)
Removable access
panel should be
installed above
furnace
dooraccess
frame
Removable
to
access
roofbe
jack
panel
should
installed above
furnace door frame
18 roof jack
to(4access
57 m"
Nearest
m)
Wall or
18"
Partition
(457
mm)
Nearest
Wall or
Partition
CLOSET DOOR
6" (152 mm)
Top Clearance
Figure 1. Alcove Installation
Provide min. 235
sq. in. (1516 cm 2 )
open free area in
front
or side
Provide
min.wall
235
sq. in. (1516 cmor2 )
open free area In
in closet
front or side wall
door
or
located
at
In top,
closet
center
door
or
bottom
located
at top,
center
or bottom
(1526"
mm)
open free area in
front or side wall
or
In closet
door
located
at top,
center
or bottom
0" Side
Clearance
to Furnace
Cabinet
Provide min. 250
sq. in. (1613 cm 2)
open free area in
front or side wall
or
in closet
door
a fully
louvered
door may
be used
1
(25 "
mm)
CLOSET DOOR
(1526"
mm)
Figure 3. Special 1” Clearance
CLOSET DOOR
CLOSET DOOR
Provide min. 250
Figure 2. Closet Installation
2
6" (152 mm)
Top Clearance
6" (152 mm)
Top Clearance
sq. in. (1613 cm )
open free area in
front
or side
Provide
min.wall
250
sq. in. (1613 cm
or 2)
open free areainincloset
front or side wall
door
aorfully
in closet
louvered
5
GENERAL INFORMATION
CAUTION:
• Do Not alter or modify this furnace or any of
its components.
• Never attempt to repair damaged or inoperable
components. This may cause unsafe operation,
explosion, fire and/or asphyxiation.
• If furnace malfunctions or does not operate
properly, contact a qualified service agency
or gas utility for assistance.
Minimum Clearances
This heating appliance must be installed with clearances
not less than the minimums listed in Table 1, (page 6).
This furnace must be installed with ample clearance for
easy access to the air filter, blower assembly, burner
assembly, controls, and vent connections. See Figure 1,
Figure 2, and Figure 3.
• The dimensions of the room or alcove must be able to
accommodate the overall size of the furnace and the
installation clearances listed in Table 1 and in Figure 4
(page 6).
“C”- 76"
“B/C” Model
w/Coil
Cabinet
19 3/4”
23 3/4"
Figure 4. Overall Dimensions
CLOSET
ALCOVE
Front
6”
18”
Back
0”
0”
Sides
0”
0”
Roof Jack
0”
0”
Top
6”
6”
Top and Sides of Duct
0”
0”
Bottom of Duct
—
—
A Cabinet (w/ coil box)
0”
0”
A Cabinet (w/o coil box)
1/4”
1/4”
0”
0”
Table 1. Minimum Clearances
6
MG1 series gas furnaces are classified as a Category
I (Catégorie I) appliance and listed as a direct vent
(sealed combustion), downflow heating appliance for
manufactured (mobile) homes and recreational vehicles.
The furnace must be located so that venting can be
properly achieved.
Unit Location
“A” Model
w/o Coil
Cabinet
B Cabinet
Applications
Air conditioning may be added to structures with MG1
series furnaces using air conditioning or conventional
units. This Installation Instruction manual includes
special requirements for incorporation of air conditioning
equipment to the MG1 furnaces.
“N”- 56"
ALL MODELS
• Alcove installations: minimum 18” clearance at front
of furnace shall be provided for future servicing. A
removable access panel should be installed between
top of the furnace door frame and the ceiling.
• Closet installations must use a louvered door having
a minimum free area of 235 in2 when located 6” from
furnace or 390 in2 for 5 ton MG1 furnaces. For special
clearance between 1” - 6”, requirements are a louvered
door with a minimum of 250 in2 free area, with the
openings in the closet door in line with the louvered
openings in the furnace door. A fully louvered closet
door may be used. See Circulating Air Requirements
section (page 7).
• The furnace must be kept free and clear of insulating
material. Examine the furnace area when the furnace is
installed or when insulation is added. Insulating material
may be combustible.
• The furnace shall be appropriately located to the supply
and return air distribution system (page 7). Sides and
back of the furnace may be enclosed by wall framing.
See Minimum Clearances section on page 6.
• The furnace installation is only intended for free air return
through the furnace door louvers. DO NOT connect a
ducted return air system directly to the furnace. Improper
installation may create a hazard and damage equipment,
as well as void all warranties.
• Furnace may be installed on combustible flooring when
using manufacturer approved duct connectors. See
page 7.
• When installed in a residential garage, the furnace must
be positioned so the burners and the source of the
ignition are located no less than 18 inches above the
floor and protected from physical damage by vehicles.
CIRCULATING AIR REQUIREMENTS
WARNING:
Do not allow combustion products to enter the
circulating air supply. Failure to prevent the
circulation of combustion products into the
living space can create potentially hazardous
conditions including carbon monoxide poisoning
that could result in personal injury or death.
The surface that the furnace is mounted on must
provide sound physical support of the furnace
with no gaps, cracks or sagging between the
furnace and the floor or platform.
Circulating air ductwork must not be connected
to any other heat producing device such as a
fireplace insert, stove, etc. This may result in fire,
explosion, carbon monoxide poisoning, personal
injury, or property damage.
Return Air
U.S.A. home manufacturers shall comply with all of the
following conditions to have acceptable return air systems
for closet installed forced air heating appliances:
• The return air opening into the closet shall not be less
than specified in the appliance’s listing.
• The cross-sectional area of the return duct system
leading into the closet, when located in the floor or
ceiling shall not be less than 235 in2.
CAUTION:
HAZARD OF ASPHYXIATION: Do not cover or
restrict return air opening.
• Means shall be provided that prevent inadvertent closure
of flat objects placed over the return air opening located
in the floor of the closet (versus the vertical front or side
wall).
• The total free area of openings in the floor or ceiling
registers serving the return air duct system must be at
A Single trunk duct
Dual trunk duct
B w/crossover connector
C
Transition duct
w/branches
Figure 5. Typical Supply Duct System
•
•
•
•
least 235 in2. At least one register should be located
where it is not likely to be covered by carpeting, boxes
and other objects.
Materials located in the return duct system must have a
flame spread classification of 200 or less. This includes
a closet door if the furnace is in a closet.
Noncombustible pans having 1” upturned flanges are
located beneath openings in a floor duct system.
Wiring materials located in the return duct system shall
conform to Articles 300-22 of the National Electrical
Code (ANSI C1/NFPA-70).
Gas piping is not run in or through the return duct system.
CAUTION:
HAZARD OF ASPHYXIATION: Negative pressure
inside the closet, with closet door closed and
the furnace blower operating on high speed,
shall be no more negative than minus 0.05 inch
water column.
• Test the negative pressure in the closet with the aircirculating fan operating at high speed and the closet
closed. The negative pressure is to be no more negative
than minus 0.05 inch water column.
• Air conditioning systems may require more duct register
and open louver area to obtain necessary airflow.
Supply Air
For proper air distribution, the supply duct system must be
designed so that the static pressure measured external
to the furnace does not exceed the listed static pressure
rating shown on the furnace rating plate.
Location, size, and number of registers should be selected
on the basis of best air distribution and floor plan of
the home. The supply air must be delivered to the
conditioned space by duct(s) secured to the furnace
casing, running full size and without interruption.
Three typical distribution systems are shown in Figure 5
FURNACE INSTALLATION
NOTE: These Installation procedures are suggested for
typical furnace installations. Since each installation is
different, the sequence of instructions may differ from
the actual installation. Only qualified HVAC technicians
should install this furnace.
The installer must be familiar with and comply with all
codes and regulations applicable to the installation of
these heating appliances and related equipment. In
the absence of local codes, the installation must be in
accordance with the current provisions of one or more of
the following standards.
• Federal Manufactured Home Constructions & Safety
Standard (H.U.D. Title 24, Part 3280.707[a][2])
• American National Standard (ANSI-119.2/NFPA-501C)
for all recreational vehicle installations.
• American National Standard (ANSI-Z223.1/NFPA-54)
and/or CAN/CSA B149 for all gas-fired furnace models.
• American National Standard (ANSI-Z95.1/NFPA-31)
and/or CSA B139 for all oil-fired furnace models.
7
20"
14 1/2"
2 3/4"
CL
REAR WALL OF CLOSET OR ALCOVE
10"
FURNACE OUTLINE
2 1/4"
24"
23 1/4"
21 3/4"
14 1/2"
FLOOR OPENING
“X”
FLOOR CUT-OUT
FOR STANDARD
DUCT CONNECTORS
CL
CL
SUPPLY AIR DUCT
FLOOR
CAVITY
CL
CUT-OUT FOR
OPTIONAL
COOLING COIL
Figure 9. Floor Cavity
1 3/4"
3/4"
CL
CL
CL
1 3/4"
3/4"
1 7/8"
2 7/8"
ALT FUEL-LINE
ENTRY 1 1/4" Dia.
2"
FUEL
LINE
FURNACE
OUTER
DOOR
DUCT CONNECTOR
SUPPLY
AIR DUCT
Figure 6. Cut-Out Dimensions for
Standard Duct Connectors
BEND TABS TIGHTLY
AGAINST SUPPLY AIR DUCT
20"
CL
10"
Figure 10. Duct Connector Tabs
10"
Fold Flap Here
ere
Cut Here
Remove
this
Flap
Cut Here
Fold Flap Here
tH
tH
Figure 7. Cut-Out Dimensions for
Round Duct Connectors
Cu
2"
Cu
FUEL
LINE
FURNACE
OUTER
DOOR
ere
ALT FUEL-LINE
ENTRY 1 1/4" Dia.
Fold Flap Here
tH
1 3/4"
3/4"
1 7/8"
2 7/8"
Cut Here
Cut Here
Cu
3/4"
Supply
Air Duct
Fold Flap Here
1 3/4"
CL
CL
OPTION 2
Remove
this
Flap
Cut Here
ere
CL
CL
CUT-OUT FOR
OPTIONAL
COOLING COIL
OPTION 1
tH
CL
CL
ere
FLOOR
CUT-OUT FOR
ROUND DUCT
(14 1/4” DIAMETER)
Cu
FURNACE OUTLINE
24"
23 1/4"
21 3/4"
REAR WALL OF CLOSET OR ALCOVE
Figure 11. Narrow Air Duct Openings
Hole for
Gas Line
od
Wo
Bend tabs
up 90°
oor
Fl
Duct connector tabs
tor
nec
Con abs
T
Duct
Connector
Mounting Plate
Narrow
Duct
ply
Sup Duct
Air
Sheet metal
screws
Figure 8. Standard Duct Connector Installed
8
Staples or sheet metal screws
Narrow
Duct
Duct
Flap
Duct
Connector
Narrow
Duct
Figure 12. Narrow Ducts
• American National Standard (ANSI-C1/NFPA-70) and/or
CSA 22.1 Canadian Electric Code Part 1 for all electrical
field wiring.
• Units have been certified under standards UL 307A & B,
UL727-1999, ANSI Z21.47/CSA 2.3, and CSA B140.10.
Standard Duct Connector Installation
General Information
1. Center the duct connector in the floor opening with
bottom tabs resting on top of the supply air duct.
2. Mark the cut-out area on the supply air duct by tracing
around the connector tabs of the duct connector. See
Figure 8 (page 8).
3. Remove the duct connector and cut out the marked
area of the supply air duct 1/4” larger the actual cutout
drawn.
• The furnace must be leveled at installation and attached
to a properly installed duct system. Do not use the
back of the furnace for return air. See page 7
for circulating requirements.
• The furnace must be installed so that all electrical
components are protected from water
• The dimensions of the room or alcove must be able to
accommodate the overall size of the furnace and the
installation clearances listed in Table 1, (page 6)
and Figure 1 (page 5)
• The furnace must be installed upstream from a
refrigeration system.
• MG1 series gas furnaces are certified for use on wood
flooring or supports, but must be installed on top of a
duct connector. This factory supplied accessory must
be installed in the floor cavity and attached to the supply
air duct before the furnace is installed.
Locating & Cutting Duct Openings
Floor cut-outs and fuel line holes must be carefully located
to avoid misalignment of the furnace, and vent piping.
To locate standard ducts see Figure 6 (page 8). For
round ducts, see Figure 7 (page 8).
1. Measure 10” from the rear wall or alcove and mark the
centerline of the cut-out on the floor.
2. Using the centerline as a starting point, draw the rest
of the duct cut-out to the dimensions shown in Figure
6 or Figure 7.
3. Cut out the floor opening 1/16” larger than the actual
cutout drawn. This will allow some clearance when
installing the duct connector.
4. Measure from the top of the floor down to the top of the
supply air duct to obtain the depth of the floor cavity.
NOTE: The depth of the floor cavity shown as “X” in
Figure 9 (page 8) will determine the correct duct
connector.
5. Determine which duct connector to use from Table 2,
(page 9).
6. Measure and drill gas hole and cut out for cooling coil
(if applicable). See Figure 6 or Figure 7.
IF FLOOR
CAVITY
“X” IS:
The standard duct connector is designed for use on
ducts 12” in width. Ducts narrower than 12” may not
allow sufficient clearances for this type of installation. See
Alternate Attachment Method section below.
SCREWS
MOUNTING
PLATE
DUCT
CONNECTOR
FUEL LINE
HOLE
FUEL LINE
HOLE
14” SUPPLY
CONNECTION
Figure 13. Round Duct Connector Installed
MTG. PLATE TABS
SECURE FURNACE
WITH 2 FASTENERS AT FRONT
CORNER HOLES
Knockout Over Holes
SUPPLY AIR DUCT
Figure 14. “A” & “B” Cabinet Furnaces
DUCT CONNECTOR
TYPE & PART NUMBER
SLIDE FURNACE
BACK AGAINST
MTG. PLATE
STANDARD DUCT
ROUND DUCT
7/8” / (22)
901987A
904008
2” / (51)
901988A
N/A
4-1/4” / (108)
901989A
904010
6-1/4” / (159)
901990A
904011
8-1/4” / (210)
901991A
904012
10-1/4” / (260)
901992A
904013
12-1/4” / (311)
901993A
904014
NOTE: Dimensions shown as Inches / (Millimeter)
Table 2. Duct Connector Sizes
SLIDE FURNACE
ALL THE WAY BACK
ONTO MTG. PLATE
MTG. PLATE TABS
SUPPLY
AIR DUCT
SECURE FURNACE
WITH 2 FASTENERS
AT FRONT CORNER HOLES
FUEL LINE HOLES
Figure 15. “A” Cabinet Furnace on Coil Cabinet
9
4. Install the duct connector back in the floor opening with
the bottom tabs extending into the supply air duct.
5. Install the optional mounting plate under the back side
of the duct connector as shown in Figure 8. Align the
screw holes in both components.
6. Secure the duct connector and the mounting plate to
the wood floor with appropriate size screws.
7. Bend the connector tabs on the bottom of the duct
connector upwards and as tight as possible against
the supply air duct.
8. Bend both tabs up 90° on the mounting plate. See
Figure 10 (page 8).
9. Seal all connections with industrial grade sealing tape or
liquid sealant. See HUD Code 3280.715 for acceptable
standards for tape and sealants.
6. Seal all connections with industrial grade sealing tape
or liquid sealant.
NOTE: Requirements for sealing ductwork vary
from region to region. Consult with local codes for
requirements specific to your area.
1. Remove furnace outer door(s) and bottom fuel line
knockout.
2. Place furnace onto duct connector and center with floor
opening.
3. Slide onto mounting plate. (Bottom rear slots on furnace
should engage with mounting plate tabs.)
4. Secure front with one (1) fastener at each corner. See
Figure 14 & Figure 15.
Alternate Attachment Method
The standard duct connector is designed for use on ducts
12” in width. However if there is insufficient clearance to
bend the duct connector tabs, this alternate attachment
method may be used.
1. Score and cut the top of the supply air duct as indicated
in Option 1 or Option 2. See Figure 11 (page 8).
NOTE: If Option 1 is selected, cut out the metal from
the shaded area.
2. Fold the two flaps (Options 1 or 2) up to form the opening
for the duct connector.
3. Install the duct connector with the bottom tabs extending
into the supply air duct.
4. Bend the tabs on the bottom of the duct connector
upwards and as tight as possible against the supply
air duct. See Figure 12 (page 8).
5. Form the flaps (Options 1 or 2) up against the duct
connector as tight as possible.
6. Secure the duct connector flaps to the supply air duct
with staples (3 minimum) or if a 2x block/joist is not
provided, use sheet metal screws (2 minimum).
NOTE: The duct connector tabs may be attached to
the air duct with sheet metal screws or other suitable
fasteners as long as the duct connector and the air duct
are securely attached.
7. Seal all connections with industrial grade sealing tape
or liquid sealant.
NOTE: Requirements for sealing ductwork vary
from region to region. Consult with local codes for
requirements specific to your area.
Round Duct Connector Installation
1. Apply a bead of caulking, mastic, or other approved
sealant around bottom side of connector.
2. Install and center the duct connector in the floor opening.
3. Install the mounting plate under the back side of the
duct connector. See Figure 13 (page 9). NOTE:
Align the screw holes in both components.
4. Secure the duct connector and the mounting plate to
the wood floor with appropriate size screws.
5. Connect the round supply duct to the underside of the
duct connector and secure them with field supplied
sheet metal screws.
10
NOTE: Requirements for sealing ductwork vary
from region to region. Consult with local codes for
requirements specific to your area.
Installing the Furnace
Sides and back of the furnace may be enclosed by wall
framing such as in a closet or alcove. The dimensions
of the room or alcove must be able to accommodate the
overall size of the furnace shown in Figure 4 (page 6)
and the installation clearances outlined on page 6. The
furnace shall be appropriately connected to the supply
distribution system as shown in Figure 14 (page 9) &
Figure 15 (page 9).
NOTE: Additional fasteners may be used at rear, sides
or through door frame, as desired, to secure furnace to
closet or alcove framing.
ROOF JACK INSTALLATION
Required ceiling and roof cut-out openings must be
carefully located to avoid misalignment of the furnace
and Roof Jack. NOTE: Install only roof jack assemblies
listed in Table 3, (page 11) on this heating appliance.
Roof Jack Selection
1. Determine depth of ceiling cavity from center of roof
opening to center of ceiling opening noted as “Dimension
A” in Figure 16 (page 11).
2. Determine ceiling height and subtract height of furnace
noted as “Dimension B” in Figure 16.
3. Add dimensions “A” & “B” (and X from Table 4, (page
11) if slant deck flashing is used). The total length of
[A] + [B] + [X] must be within the minimum and maximum
range of the roof jack listed in Table 3.
Application Notes
• FAW, FAWT, SAW and SAWT series roof jacks with a
5” diameter inner vent pipe may be used with all models
of MG1 Series gas furnaces.
F = Flat Flashing: flexes from 0/12 to 1/12 roof slope.
See Figure 17 (page 11).
S = Slant Flashing: 2.5/12 Slope flexes from 1/12 to
4/12 roof slope, 4/12 flexes from 3/12 to 5/12.
See Figure 18 (page 11).
• MG1 furnaces may be used with roof jack systems and
extension accessories as tall as 170” (except MG1-056
models, which are limited to 120”). An internal roof jack
extension (p/n 901935 - 10”, p/n 903107 - 18”) can be
used to increase roof jack height. All connections inside
the home must be made below the ceiling.
• This furnace must never be connected to a chimney
flue servicing a fireplace or other appliance designed
to burn solid fuel.
ROOF JACK
CROWN
SLANT DECK
FLASHING
"X" (SEE TABLE 5)
CEILING
“A”
Roof
PITCHED
Opening
ROOF
Flue Pipe
Combustion Air Pipe
“B”
APPROX. LENGTH
BELOW FLASHING
(F,S)AW1523-(0,2,4)(A,S)
15” - 23”
(F,S)AW2135-(0,2,4)(A,S)
21” - 35”
(F,S)AW2747-(0,2,4)(A,S)
27” - 47”
(F,S)AW3563-(0,2,4)(A,S)
35” - 63”
(F,S)AW5195-(0,2,4)(A,S)
51” - 95”
NOTE: Not all models are available. Check with your local distributor
for available models.
S AW
F = FLAT FLASHING
S = SLANT FLASHING
AW= ALL WEATHER
Furnace
56"
or
76"
S
FLUE STEEL TYPE
A= ALUMINIZED
S=STAINLESS
MIN. ADJ.
LENGTH
FLASHING
PITCH/12" RISE
0=FLAT
2=2.5/12
4=4/12
MAX. ADJ.
LENGTH
Table 3. Roof Jack Assemblies
ROOF JACK
SERIES
Figure 16. Ceiling Cavity Depth
“F Series
ROOF JACK
CROWN
27 47 - 2
SLANT DECK
FLASHING
“S” Series
(2.5 / 12 Pitch only)
"X" (SEE TABLE 5)
CEILING
CAVITY
IF ROOF
PITCH IS:
SLANT DECK
FLASHING
NUMBER
“X”
2” in 12”
903893 (2.5/12)
2-1/8”
2-1/2” in 12”
903893 (2.5/12)
2-1/2”
3” in 12”
903894 (3/12)
2-7/8”
3-1/2” in 12”
903894 (3/12)
3-1/4”
4” in 12”
903895 (4/12)
3-5/8”
4-1/2” in 12”
903895 (2.5/12)
2-1/8”
5” in 12”
903895 (2.5/12)
2-1/2”
5-1/2” in 12”
903894 (3/12)
2-7/8”
6” in 12”
903894 (3/12)
3-1/4”
6-1/2” in 12”
903895 (4/12)
3-5/8”
Optional deck flashings for flat and 2.5/12 pitch roof jacks.
4/12 pitch roof jacks not applicable.
Table 4. Slant Deck Flashings
PITCHED
ROOF
CEILING
ROOF
OPENING
20"
CL
10"
Figure 17. Example of Flat Jack with Flashing
REAR WALL OF CLOSET OR ALCOVE
ROOF JACK WITH
2 1 2 /12 SLANT
FLASHING
24"
2 1 2 /12
SLANT DECK
5/12 ROOF SLOPE
Figure 18. Example of 2½ / 12 Slant Jack
with Flashing
FURNACE OUTLINE
CEILING
OPENING
13 1/2"
CEILING
CAVITY
MODEL NUMBER
CEILING
CUT-OUT FOR
FLUE AND
ROOF JACK
CL
FURNACE
OUTER
DOOR
Figure 19. Cut-Out Dimensions for
Flue & Roof Jack
11
• If the roof jack crown is covered or blocked with snow, the
furnace will not operate properly. If the home is located
in regions where snow accumulation exceeds 7” (HUD
snowload zones) use an external roof jack extension
(p/n 901937). A maximum of 2 extensions per roof jacks
can be used. Extensions are optional accessories and
may be purchased through your distributor.
Secure roof jack with
appropriate fasteners
after connecting to
furnace
Locating & Cutting Roof / Ceiling Openings
Caulk under roof
flashing to prevent
water leakage
Roof
Ceiling
Optional 2-piece ceiling
ring #902521
NOTE: Refer to the installation instructions provided
with optional air conditioning packages when installing
furnaces with optional cooling coil cabinet or with optional
C* series indoor coils.
Figure 20. Flat Roof
Secure lower roof
jack section with
no. 10 S.M. screws
Upper Roof Jack Section
Optional Slant
Deck Flashing
Secure flashing
with appropriate
fasteners
Caulk under roof
flashing to prevent
water leakage
Ceiling
Figure 21. Pitched Roof
CONNECT OUTER
FLUE SHIELD
INNER FLUE PIPE
VENT COLLAR
MOUNTING
FLANGE
Figure 22. Combustion Air Pipe Connection
12
IMPORTANT NOTE:
Do not allow debris to fall into the furnace. This
could cause unsafe operation and void the furnace
warranty. Use the top cap that comes with the furnace
packaging (or alternate protector) to prevent debris
from falling into the furnace before the final roof jack
connection is made.
1. Locate center of Roof Jack opening, measure 13 1/2”
from the rear wall of closet or alcove along the center
line of furnace and floor opening. See Figure 19.
2. Cut ceiling and roof holes:
• Ceiling = 8 3/4” (222 mm) diameter
• Roof = 9 3/8” (238 mm) diameter
Installing The Roof Jack
1. Apply caulking compound on underside of roof flashing
to form a continuous strip at least 3/8” wide around the
underside of the perimeter of the flashing. For flat roof,
see Figure 20 or see Figure 21 if roof is pitched.
2. Connect roof jack assembly to the furnace. Insert
telescoping roof jack assembly through the opening
cut on the roof.
3. Connect inner flue pipe to vent collar of the furnace.
See Figure 22.
4. Connect combustion air pipe to furnace collar with sheet
metal screw. See Figure 22.
NOTES:
• It is recommended that the connection of the combustion
air pipe to the furnace be made before the flashing is
secured to the roof to maintain alignment of roof jack
and furnace connections.
• For replacement furnaces, be sure the inner flue pipe
connects over the furnace vent collar. DO NOT use a
smaller diameter inner flue pipe which could slide
inside the furnace vent collar and restrict the flow
of furnace flue products.
5. Attach roof flashing. If necessary, shift roof flashing
slightly in the roof opening so that assembly is in
alignment with furnace.
NOTE: If flashing is mounted on 12 degree angle, it
may be necessary to adjust the angle to match the roof
pitch; (1/12 - 4/12 maximum).
6. Press down firmly on roof flashing (over caulking) to
make the seal with roof water tight.
7. Secure flashing with appropriate fasteners. NOTE:
For added protection against leaks, coat the exposed
flashing plate and fasteners with approved roofing
compound.
NOTE: Upper roof jack crown to be stored in a
prominent location inside manufactured home until
on-site installation.
Installing Transit-Mode Venting System
(Before Home is Moved to Site)
NOTE: For transit purposes, the transit kit (P/N 903838)
should be installed before home is moved to site.
1. Furnace must be installed in accordance to furnace
installation manual.
2. Select appropriate roof jack from Table 3, (page 11)
3. Roof jack (less upper roof jack crown), with weather
cap to be installed as described in Installing The Roof
Jack section.
4. Install the four warning tags (factory supplied) on these
items:
• Weather cap
• Fuel line connection point
• Furnace flame observation door
• Furnace wall thermostat
Removing the Transit-Mode Venting System
(After home is moved to site)
WARNING:
Failure to properly secure the flue pipe to
the furnace may result in fire, explosion or
asphyxiation when operating the furnace.
1. Transit-mode weather cap to be removed and upper
roof jack crown installed. Do not discard the screws.
See Figure 23.
2. Place upper roof jack (crown) on the flue pipe assembly.
NOTE: Make sure inside flue pipe attaches over inner
flue pipe and outer Roof Jack pipe fits over outer pipe.
3. Secure in place using three sheet metal screws (#10
x 1/2”) removed in step 1. Do not use the same holes
which secured the rain cap in place.
4. Remove and discard all 4 venting system warning tags.
COMPLETED
ASSEMBLY
WEATHER CAP
Failure to follow safety warnings exactly could
result in serious injury, death or property
damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical
power to furnace.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
AVERTISSEMENT :
RISQUE DE DÉCHARGE ÉLECTRIQUE,
D’INCENDIE OU D’EXPLOSION
Le non-respect des avertissements de sécurité pourrait
entraîner des blessures graves ou des dommages
matériels importants.
Un entretien inapproprié peut provoquer un
fonctionnement dangereux, des blessures graves, la
mort ou des dommages matériels.
• Avant toute intervention, coupez l’alimentation
électrique de la fournaise.
• Pour l’entretien des commandes, étiquetez tous les
fils avant de les débrancher. Rebranchez les fils
correctement.
• Vérifiez le bon fonctionnement après l’intervention.
Line Voltage Wiring
• Electrical connections must be in compliance with all
applicable local codes with the current revision of the
National Electric Code (ANSI/NFPA 70).
• For Canadian installations the electrical connections
and grounding shall comply with the current Canadian
Electrical Code (CSA C22.1 and/or local codes).
FLASHING
OUTER PIPE
Figure 23. Roof Jack Crown
ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
To avoid electric shock, personal injury, or death,
turn off the electric power at the disconnect or the
main service panel before making any electrical
connections.
SCREWS
FLUE ASSEMBLY
WARNING:
WARNING:
UPPER ROOF
JACK (CROWN)
INNER FLUE PIPE
ELECTRICAL INFORMATION
TO FURNACE
It is recommended that 115VAC line voltage be supplied
to the furnace from a dedicated branch circuit containing
the correct fuse or circuit breaker for the furnace as listed
in Table 5, (page 15).
13
IMPORTANT NOTE:
Refer to the wiring diagram inside the control box
cover or Figure 32 (page 27) and Figure 33 (page 28)
for the wiring of your particular unit. Any other wiring
methods must be acceptable to authority having
jurisdiction.
CAUTION:
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
IMPORTANT NOTE:
Proper line voltage polarity must be maintained in
order for the control system to operate correctly.
Verify the incoming neutral line is connected to the
white wire and the incoming “hot” line is connected
to the black wire. The furnace will not operate unless
the polarity and ground are properly connected as
shown in Figure 25 and Figure 26 (page 14).
On-Off
Switch
Thermostat Wires
Furnace
Control Box
Blower
Plug
To combustion
Blower or Flame
Roll-out Switch
Power
Entry
To Gas Valve
or Burner
On-Auto Switch
(Heating Models Only)
Figure 24. Control Panel (All Models)
For installation of A-size Cabinet furnaces, allow sufficient
slack in the wiring if an optional cooling coil cabinet is
added at a later time. Use of copper conductors is
recommended.
Rc
Connecting Power Supply Wires
W
1. Remove the furnace control panel cover.
2. Route wires (115 VAC) through the strain relief on the
left side of the furnace control box. See Figure 24.
3. Connect the hot wire to the black pigtail lead, and
the neutral wire to the white pigtail lead. Secure all
connections with suitable wire nuts.
4. Connect the ground wire to the grounding screw.
5. Reinstall the control panel cover and secure with the
original mounting screws.
FURNACE
THERMOSTAT
Red
Red
R
RH
ECM
Blower
Motor
White
White
Yellow
G
Y
W
G
Grey
C
Yellow
To AC Contactor
Figure 25. Thermostat Wiring for UTEC/NORDYNE
Control boards
FURNACE
THERMOSTAT
Rc
Red
Red
R
RH
White
White
G
Green
Green
Y
Yellow
Yellow
Y
Yellow
Grey
C
Grey
W
C
Grey
W
G
To AC
Contactor
Figure 26. Thermostat Wiring for Emerson
control boards
14
FURNACE
MODEL
NUMBER-
FURNACE
INPUT
(BTUH)
CABINET
WIDTH
(IN.)
NOMINAL
ELECTRICAL
SUPPLY
MINIMUM
OPERATING
VOLTAGE
MAXIMUM
OPERATING
VOLTAGE
MAXIMUM
FURNACE
AMPERES
MAXIMUM
FUSE OR CIRCUIT
BREAKER AMPS*
MINIMUM
CIRCUIT
AMPACITY1
MG1E-056
56,000
19 3/4
115-1-60
103
127
9.4
15
11.8
MG1E-070
70,000
19 3/4
115-1-60
103
127
9.4
15
11.8
MG1E-077
MG1E-090
77,000
85,000
19 3/4
19 3/4
115-1-60
115-1-60
103
103
127
127
9.4
9.4
15
15
11.8
11.8
NOTE: Minimum wire gauge and maximum fuse/circuit breaker amperage are based on MCA and MOP calculations. This furnace is approved
for installation with a 15 amp fuse/circuit breaker however. Wire sizing must adhere to current version of the NEC and/or applicable local codes
depending upon the overcurrent protection.
* Non-time-delay fuses or circuit breakers are required.
THERMOSTAT WIRE GAUGE
RECOMMENDED THERMOSTAT WIRE LENGTH (TOTAL LENGTH)
2 - WIRE - HEATING
4 OR 5 WIRE - COOLING
24
22
55 ft.
90 ft.
25 ft.
45 ft.
20
18
140 ft.
225 ft.
70 ft.
110 ft.
Total wire length includes wire from furnace to the thermostat, from thermostat to outdoor unit, & from outdoor unit back to the furnace.
Table 5. Voltage Specifications & Thermostat Wire Gauge
Low Voltage Wiring
• The furnace is designed to be controlled by a 24 VAC
thermostat. The thermostat’s wiring must comply with
the current provisions of the NEC (ANSI/NFPA 70) and
with applicable local codes having jurisdiction.
• The thermostat must be installed according to the
instructions supplied by the thermostat manufacturer.
Low voltage connections (24 VAC) from the thermostat
are wired to the terminal strip on the integrated control
in the furnace.
• The thermostat should be mounted about 5 feet above
the floor on an inside wall. DO NOT install the thermostat
on an outside wall or any other location where its
operation may be adversely affected by radiant heat from
fireplaces, sunlight, or lighting fixtures, and convective
heat from warm air registers or electrical appliances.
Refer to the thermostat manufacturer’s instruction sheet
for detailed mounting information.
• The nominal anticipator setting is 0.4. Refer to the
thermostat literature for additional information.
• Best practice is to use five-wire conductor thermostat
wire for 24 volt low-voltage circuit (2-wire is required
for furnace only; 5-wire for heating and optional cooling
systems). Refer to Table 6, (page 17) for thermostat
wire information.
Verifying Anticipator Setting
After the furnace is installed, check the thermostat
anticipator against the nominal setting of 0.4.
1. Connect the milliamp meter in series with one of the
gas valve’s low voltage terminals.
2. Energize the gas valve.
3. Read the value of the milliamps.
4. Adjust the heat anticipator of the thermostat to the
value on the milliamp meter. If the heat anticipator is
set too high, the furnace may delay turning on. If set too
low, the furnace may cycle frequently and not provide
comfort to the homeowner.
Grounding
WARNING:
To minimize personal injury, the furnace cabinet
must have an uninterrupted or unbroken electrical
ground. The controls used in this furnace require
an earth ground to operate properly. Acceptable
methods include electrical wire or conduit
approved for ground service. Do not use gas
piping as an electrical ground!
Connecting Thermostat Wires
1. Insert 24 volt wires through the plastic grommet just
above the control panel.
2. Connect the thermostat wires to the furnace low voltage
pigtails (dependent on the installation application). See
Figure 25 and Figure 26 (page 14). NOTE: If AC is
installed with the furnace, a Y connection is required
to be made at the furnace. See Figure 32 (page 27)
and Figure 33 (page 28).
3. Connect low-voltage circuit to the wall thermostat.
4. A hole may be made in the furnace cabinet to ease
thermostat wiring. Make sure that the wiring is protected
from the sharp edge of the added hole.
15
FUEL SUPPLY & PIPING
WARNING:
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could
result in serious injury, death or property
damage.
• Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
• Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call
the fire department.
AVERTISSEMENT :
RISQUE D’INCENDIE OU D’EXPLOSION
• Le non-respect des avertissements de sécurité pourrait
entraîner des blessures graves ou des dommages
matériels importants.
• L’installation et l’entretien doivent être effectués par
un installateur qualifié, un organisme de service ou le
fournisseur de gaz.
• N’entreposez pas ni n’utilisez de l’essence ni d’autres
vapeurs ou liquides inflammables dans le voisinage de
cet appareil, ni de tout autre appareil.
This furnace may be installed with left, right, or bottom gas
entry. When connecting the gas supply, provide clearance
between the gas supply line and the entry hole in the
furnace casing to avoid unwanted noise and/or damage
to the furnace. Typical gas service hookup for this furnace
is shown in Figure 27.
Table 10, (page 25) lists gas flow capacities for standard
pipe sizes as a function of length in typical applications
based on nominal pressure drop in the line.
IMPORTANT NOTES:
• Some local regulations require the installation of a
manual main shut-off valve and ground joint union
external to the furnace. See Figure 27. The shutoff valve should be readily accessible for service
and/or emergency use. Consult the local utility or
gas supplier for additional requirements regarding
placement of the manual main gas shut-off.
• Per ANSI 21.47, A 1/8-inch NPT plugged tapping,
accessible for test gauge connection, must be
installed immediately upstream of the gas supply
connection to the furnace external to the cabinet.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do
not use a connector that has previously serviced
another gas appliance.
• Gas piping must never run in or through air ducts,
chimneys, gas vents, or elevator shafts.
• Compounds used on threaded joints of gas piping
must be resistant to the actions of -liquefied
petroleum gases.
On-Off-Fan
Switch
QUE FAIRE S’IL Y A UNE ODEUR DE GAZ
• N’essayez d’allumer aucun appareil.
• Ne touchez à aucun interrupteur électrique; n’utilisez
aucun téléphone dans le bâtiment.
• Évacuez l’immeuble immédiatement.
• Appelez immédiatement votre fournisseur de gaz à l’aide
du téléphone d’un voisin. Respectez les instructions du
fournisseur de gaz.
• Si personne ne répond, appelez le service des incendies.
WARNING:
All piping must conform with local building codes,
or in the absence of local codes, with the most
recent edition of the National Fuel Gas Code ANSI
Z223.1 or (CAN/CSA B149.1). Failure to follow all
safety warnings could result in serious injury,
death or property damage.
Control
Panel
Floor
To Gas
Floor C
avity
Supply
Alt. Fuel
Line Entry
Some codes may require installation of a manual main shut-off
valve and ground joint union external to the furnace. The shut-off
valve should be readily accessible for service and/or emergency
use. Consult the local utility or gas supplier for additional
requirements regarding placement of the manual main gas shut-off.
Figure 27. Typical Gas Piping
16
• The main gas valve and main power disconnect to
the furnace must be properly labeled by the installer
in case emergency shutdown is required.
• Flexible gas connectors are not recommended for
this furnace but may be used if allowed by local
jurisdiction. Only new flexible connectors may be
used. DO NOT reuse old flexible gas connectors.
• Best practice is to use a drip leg for a vertical run
to the unit.
• All piping shall be black iron pipe. Internally tinned
copper tubing may be used for gas supply systems.
• Fuel line installations other than typical installations
shown in Figure 27 must comply with the fuel piping
provisions stated in the Federal Manufactured Home
Standard (H.U.D. TITLE 24, PART 3280) and the
National Fuel Gas Code (ANSI-Z223.1/NFPA-54).
• Shut-off valve must be designed and listed for use
with liquid petroleum (L.P. gas).
• Plugged tappings (1/8” NPT) for test gauge
connection are present on the gas valve. See Figure
27 for locations.
The gas supply to your home will either be Natural Gas
or L.P. Your furnace is factory equipped to operate on
Natural Gas. If your gas supply is L.P., you must contact
a qualified serviceman or gas supplier to convert the
furnace. Instructions for conversion to propane are shown
on page 19. Factory installed orifice sizes are listed in
Table 6, (page 17).
For natural gas operation, the maximum inlet pressure
for the valve is 7” W.C and the minimum inlet pressure
is 4.5” W.C. Pressure is reduced to 3 1/2” W.C. by the
pressure regulator in the gas valve.
P
L
L
OR
P
T
NA
NA
For LP gas, pressure to the gas valve must be more than
11” W.C. but not more than 13” W.C. Pressure is reduced
to 10” W.C. by the pressure regulator in the gas valve.
OTHER SIDE
OF CAP
T
INLET PRESSURE
TAP (1/8 NPT)
OUTLET PRESSURE
TAP (1/8 NPT)
T
NA
NOTE: Optional fuel inlet lines are available for all gas
furnace models to permit the addition of a 1/2” F.P.T.
shut-off valve above the floor.
NA
PRESSURE
REGULATOR
CAP
T
Figure 28. Honeywell Gas Valve
ORIFICE NO
FURNACE
MODEL #
INPUT
MBTU/H
OUTPUT
MBTU/H
NAT.
LP
E.S.P.
IN WC
IGNITOR
DIRECT
COMB.
BLOWER
MOTOR
HP
A/C READY
TONS
MG1E-056
MG1E-070
MG1E-077
MG1E-090
56
70
77
85
45
57
62
68
29
24
21
17
45
42
40
36
0.3
0.3
0.3
0.3
Y
Y
Y
Y
Y
Y
Y
Y
3/4
3/4
3/4
3/4
4
4
4
4
NOTES:
• Electrical Supply: 120 volts, 60HZ, 1 Ph. Fuse or
Breaker - 15 amps
• Temperature Rise: 45° F to 75° F
• High Altitude for US and Canadian installations:
See High Altitude section on page 18.
•
•
•
•
Thermostat Circuit: 24 volts, 60HZ, 30 vac
Normal Anticipator Setting: 0.4
Manifold Pressure for Natural Gas: 3.5” w.c.
Manifold Pressure for LP Gas: 10” w.c.
Table 6. MG1 Furnace Specifications - Factory Settings
Leak Check
WARNING:
AVERTISSEMENT :
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury, death or property
damage.
RISQUE D’INCENDIE OU D’EXPLOSION
Le non-respect des avertissements de sécurité pourrait
entraîner des blessures graves ou des dommages matériels
importants.
Never test for gas leaks with an open flame.
Use a commercially available soap solution
made specifically for the detection of leaks
to check all connections. A fire or explosion
may result causing property damage, personal
injury or loss of life.
N’effectuez jamais d’essai d’étanchéité des gaz avec une
flamme nue. Utilisez une solution savonneuse offerte sur
le marché conçue spécialement pour la détection des
fuites pour vérifier tous les raccordements. Un incendie ou
une explosion pourrait survenir et causer des dommages
matériels, des blessures ou des pertes de vie.
17
After the gas piping to the furnace is complete, all
connections must be tested for gas leaks. This includes all
fittings, pipe connections at the main gas valve, emergency
shutoff valve, and flexible gas connectors (if applicable).
The soap and water solution can be applied on each
joint or union using a small paintbrush. If any bubbling is
observed, the connection is not sealed adequately and
must be retightened. Repeat the tightening and soap
check process until bubbling ceases.
CAUTION:
When pressure testing gas supply lines at
pressures greater than 1/2 psig (14 inch W.C.), the
gas supply piping system must be disconnected
from the furnace to prevent damage to the gas
control valve. If the test pressure is less than or
equal to 1/2 psig (14 inch W.C.), close the manual
shut-off valve
Flue Gas Sampling
It may be necessary to take flue gas sampling in order
to check the performance after furnace installation. A
flue gas sample may be taken from the heat exchanger,
which is located behind the hole of the top-front of blower
compartment.
1. Turn off all electric power to the appliance.
2. Remove the black plastic cap located above the blower.
Do not discard cap.
3. Drill a hole through the top of the blower compartment.
NOTE: Hole diameter should be same size as sampling
tube.
4. Insert sampling tube through the drilled hole and into
the heat exchanger.
5. After a complete check and adjustment of furnace
performance, seal the drilled hole with a screw larger
than the hole. NOTE: Seal the screw threads with silicon
sealant - rated at least 500° F.
6. Plug the outside hole with the plastic cap removed in
step 3.
High Altitude Conversion
WARNING:
The reduction of input rating necessary for high
altitude installation may only be accomplished
with factory supplied orifices. Do not attempt to
drill out orifices in the field. Improperly drilled
orifices may cause fire, explosion, carbon
monoxide poisoning, personal injury or death.
High altitude conversion with this furnace depends on
the installation altitude and the heating value of the gas.
The installation of this furnace at altitudes above 2,000
feet must meet the requirements of the National Fuel Gas
Code or local jurisdiction. In Canada, the requirements for
high altitude are different and governed by CSA B149.1.
Always consult your local code authority.
18
This furnace is shipped from the factory with orifices and
gas regulator settings for natural gas operation at sea
level altitudes. At 2,000 feet, the NFGC requires that this
appliance be derated 4% for each 1000 feet of altitude. For
example, the input needs to be reduced 8% at 2,000 feet,
12% at 3,000 feet and etc. This deration is in reference to
the input rate and gas heating value at sea level.
To derate the furnace requires knowing the heating value of
the gas at the installation site. Heating values at particular
job sites vary for two reasons:
1. The chemical mixture of the gas varies from region to
region and is expressed as the “sea level heating value”.
2. The heating value varies by altitude. For this reason,
especially in high altitude areas, the local gas utility
specifies the heating value at the residence’s gas meter
as the “local value”.
For added flexibility, two tables have been provided for
natural gas installations with high or low heating values
at sea level. Table 12, (page 26) & Table 13, (page 26)
contain the manifold pressure and orifice sizes to use
at various altitudes. Table 12 (HIGH) is for natural gas
installations with a heating value of more than 1,000 Btu
per cubic foot and Table 13 (LOW) is for less than 1,000
Btu per cubic foot. To determine which table to use:
1. Consult the local utility for the local heating value at
your installation site.
2. From Table 11, (page 26), find your local heating value
as supplied by the utility company. Follow down the
column and stop at your altitude level.
3. If your sea level heating value is HIGH, use Table 12
or if it’s LOW, use Table 13. See Example.
After changing the orifices, it is required that you measure
the gas input rate. This may be accomplished in the usual
way, by clocking the gas meter and using the local gas
heating value. See Verifying Input Rate (page 21).
IMPORTANT NOTE:
Observe the action of the burners to make sure there
is no yellowing, lifting or flashback of the flame.
Installation Example
Elevation:.................................................... 5,000 feet
Type of Gas:.............................................Natural Gas
Local Heating Value of Gas:................................750
Determine which natural gas table to use. From Table
11, (page 26), find 750 and follow down the column,
stop at the 5,000 feet row. The heating value listed is
LOW. Table 13, (page 26) will be used to determine
orifice size and verify manifold pressure.
Conversion to Propane (LP) Gas
WARNING:
This furnace was shipped from the factory
equipped to operate on natural gas. Conversion
to LP/propane gas must be performed by qualified
service personnel using factory supplied
conversion parts. Failure to use the proper
conversion kit can cause fire, explosion, property
damage, carbon monoxide poisoning, personal
injury, or death.
WARNING:
Shut off the gas supply at the manual gas shutoff
valve, before disconnecting the electrical power.
A fire or explosion may result causing property
damage, personal injury or loss of life. Failure to
follow the safety warnings exactly could result in
serious injury, death or property damage.
WARNING:
To avoid electric shock, personal injury, or death,
turn off the electric power at the disconnect or the
main service panel before making any electrical
connections.
This furnace can be converted from factory-equipped
natural gas to liquid propane gas. Conversion of this valve
requires replacement of the burner orifice and flipping the
regulator cap to the side marked LP. The orifice required
for conversion is supplied with the furnace. See Figure 27.
For altitudes between 0 and 1,999 feet, use the factory
supplied LP orifice as shown in Table 6, (page 17).
Altitudes between 2,000 and 10,000 feet require the orifice
to be changed. Table 14, (page 29) lists the correct orifice
size and manifold pressure at different altitudes.
Atmospheric & Direct Ignition Furnaces
1. Follow the instructions in “How to Shut Off Gas - Direct
Ignition” on page 21.
2. Disconnect the gas pipe union and the electrical wires
connected to the gas valve.
3. Remove the gas valve assembly:
4. Remove screw(s) from gas valve bracket. Gas valve and
spud may be removed. Orifice is located at the end of
the spud.
5. Replace the main orifice with the L.P. gas orifice supplied
in the envelope located by the gas valve. Verify the
orifice size matches the nameplate or Table 6, (page
17).
6. Unscrew the pressure regulator cap and check for the
letters NAT or LP. See Figure 27 (page 17).
7. Invert the cap and tighten until snug.
8. Reassemble the burner assembly into the furnace.
9. Reconnect the gas piping and electrical wires to the
gas valve.
10.Open the manual shut-off valve and follow the Operating
Instructions on page 20.
Measuring the Supply Gas Pressure
To obtain an accurate pressure reading, turn off all
gas appliances (i.e. Dryers, water heaters, stoves,
etc.) at their ON/OFF control or individual gas valves.
1. Remove the inlet pressure plug from the INLET side
of the gas valve with a 3/16 Allen wrench. See Figure
27.
2. Install a 1/8 NPT fitting, which is compatible with a
manometer or similar pressure gauge.
3. Connect the manometer or pressure gauge to the inlet
pressure tap.
4. Turn on all electrical power to the furnace.
5. Turn the main gas supply valve (on the outside of the
unit) to the ON position.
6. Start the furnace by adjusting the thermostat to it’s
highest setting. Allow the furnace to run for 10 minutes.
7. Check the incoming gas line pressure. Propane gas
furnaces must be between 11.0”-14.0” W.C. Natural
gas installations must be between 4.5”-10.0” W.C. If
the pressure is not between these specified ranges,
contact your local gas supplier for adjustment.
8. Adjust the thermostat to it’s lowest setting and allow
the unit to cycle off.
9. Turn the main gas supply valve (on the outside of the
unit) to the OFF position.
10.Turn off all electrical power to the furnace.
11.Disconnect the manometer or pressure gauge.
12.Remove the NPT fitting and reinstall the inlet pressure
plug. NOTE: To prevent cross threading, hand tighten
the plug first, then tighten with 3/16 Allen wrench.
Measuring the Manifold Pressure
The manifold pressure must be measured by installing a
pressure gauge (Manometer, Magnehelic Meter, etc.) to
the outlet end of the gas valve.
1. Remove the manifold pressure plug from the outlet side
of the gas valve with a 3/16 Allen wrench. See Figure
27 (page 17).
2. Install a 1/8 NPT fitting, which is compatible with a
Manometer or similar pressure gauge.
3. Connect the manometer or pressure gauge to the pipe
thread fitting.
4. Start the furnace by adjusting the thermostat 5 degrees
above room temperature. Allow the furnace to operate
for 3 minutes.
5. Measure the manifold pressure on the manometer or
pressure gauge. Compare the measured value to the
value in Table 12, (page 26), Table 13, (page 26), or
Table 14, (page 29).
6. Replace the cap so that the letters facing up represent
the type of gas being used for the furnace. See Figure
27 (page 17).
7. Adjust the thermostat to its lowest setting.
8. Turn off the main gas supply to the unit at the manual
shut-off valve, which is located outside of the unit.
9. Turn off all of the electrical power to the furnace.
19
10.Disconnect the manometer or pressure gauge.
11.Remove the 1/8 NPT fitting and reinstall the manifold
pressure plug. NOTE: To prevent cross threading,
hand tighten the plug first then tighten with 3/16 Allen
wrench.
STARTUP & ADJUSTMENTS
PLEASE READ ALL SAFETY INFORMATION
BEFORE LIGHTING THE FURNACE
WARNING:
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could
result in serious injury, death or property
damage.
• Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
• Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
•
•
•
•
•
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electrical switch; do not
use any phone in your building.
Leave the building immediately.
Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
If you cannot reach your gas supplier, call
the fire department.
AVERTISSEMENT :
RISQUE D’INCENDIE OU D’EXPLOSION
• Le non-respect des avertissements de sécurité pourrait
entraîner des blessures graves ou des dommages
matériels importants.
• L’installation et l’entretien doivent être effectués par
un installateur qualifié, un organisme de service ou le
fournisseur de gaz.
• N’entreposez pas ni n’utilisez de l’essence ni d’autres
vapeurs ou liquides inflammables dans le voisinage de
cet appareil, ni de tout autre appareil.
QUE FAIRE S’IL Y A UNE ODEUR DE GAZ
• N’essayez d’allumer aucun appareil.
• Ne touchez à aucun interrupteur électrique; n’utilisez
aucun téléphone dans le bâtiment.
• Évacuez l’immeuble immédiatement.
• Appelez immédiatement votre fournisseur de gaz à l’aide
du téléphone d’un voisin. Respectez les instructions du
fournisseur de gaz.
• Si personne ne répond, appelez le service des incendies.
20
WARNING:
Before placing the furnace in service, it must be
checked to ensure it is equipped for the type of gas
being used. The burner flame must be observed
and adjusted if necessary. Failure to observe this
caution may result in unsafe operation, explosion
and/or fire, or asphyxiation. See the Gas Supply
and Combustion Air sections.
• The first operation of the furnace after any home
setup must be performed by a qualified service
technician.
• BEFORE STARTUP: Smell all around the furnace for
gas and next to the floor. Some gas is heavier than air
and may settle on the floor.
• Do not use this furnace if any part has been under
water. Immediately call a service technician to inspect
the furnace and to replace any part of the gas valve or
control system which has been under water.
WARNING:
Close the hinged fire door. If door is left open
or spring is broken it may allow products of
combustion into the living space by the furnace
blower, resulting in possible asphyxiation.
WARNING:
Should overheating occur, or the gas supply fails
to shut off, shut off the manual gas valve to the
furnace before shutting off the electrical supply.
AVERTISSEMENT :
En cas de surchauffe, ou si l’alimentation de gaz
omet de s’arrêter, fermez le robinet de gaz manuel
à la fournaise avant de couper l’alimentation
électrique.
Operating Instructions
(Direct Ignition Furnaces)
Direct ignition furnaces do not have a pilot. Ignition is
accomplished by a hot surface ignitor. A circuit board
takes care of all timing functions. After lighting, the circuit
board uses the ignitor as a flame sensor, shutting off gas
should the flame go out. There are no external relays or
timing devices. Do not try to light this furnace by hand.
The circuit board is not field serviceable.
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance.
3. Remove the furnace door and turn off the gas valve.
Push in and turn the gas control knob clockwise to OFF.
See Figure 29 (page 21).
4. Wait ten (10) minutes to clear out any gas. If you smell
gas, STOP! and follow the Safety Information. If you
do not smell gas, proceed to step 5.
5. Set the thermostat MODE the ON position.
6. Turn the gas valve ON. Push in and turn gas control
knob counter-clockwise to ON (Figure 29).
7. Replace the furnace door.
8. Turn on all electric power to the appliance.
9. Change the thermostat mode to HEAT and the
temperature selector to a desired temperature level.
The igniter should light in approximately 75 seconds.
If the appliance will not operate, see “How to Shut Off
Gas - Direct Ignition” on page 21 and call your service
technician or gas supplier.
NOTE: In the event of any flashback or explosion,
immediately shut off the furnace and call your service
technician.
How to Shut Off Gas - Direct Ignition Models
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance before
servicing unit.
3. Set the furnace On-Off Switch to OFF.
4. Turn gas control knob clockwise to OFF (Figure 29).
5. Replace the furnace door.
Verifying Input Rate
IMPORTANT NOTE:
The input rate must not exceed the rate shown on the
furnace rating plate. At altitudes above 2,000 feet, it
must not exceed that on the rating plate less 4% for
each 1,000 feet.
The input rate must be verified for each installation to
prevent over-firing of the furnace. To determine the exact
input rate, perform the following procedures:
1. Shut off all other gas fired appliances.
2. Start the furnace and run it for at least 3 minutes.
3. Measure the time (in seconds) required for the gas
meter to complete one revolution.
4. Convert the time per revolution to cubic feet of gas per
hour using Table 9, (page 25).
5. Multiply the gas flow rate in cubic ft per hr by the heating
value of the gas in Btu per cubic ft to obtain the input
rate in Btuh. See example.
Example:
• Time for 1 revolution of a gas meter with a 1 cubic ft
dial = 40 seconds.
• From Table 9 read 90 cubic ft gas per hr.
• Local heating value of the gas (obtained from gas
supplier) = 1,040 Btu per cubic ft.
• Input rate = 1,040 x 90 = 93,600 Btuh.
as close to the furnace as possible. To avoid false
readings, the thermometer on the supply air side must be
shielded from direct radiation from the heat exchanger.
2. Adjust all registers and duct dampers to the desired
position and run the furnace for 10 to 15 minutes in
high fire before taking any temperature readings. The
temperature rise is the difference between the supply
and return air temperatures.
For typical duct systems, the temperature rise will fall
within the limits specified on the rating plate with the
blower speed at the factory recommended setting. If
the measured temperature rise is outside the specified
limits, it may be necessary to change the speed of the
blower. NOTE: Lowering the blower speed increases the
temperature rise and a higher blower speed will decrease
the temperature rise.
The furnace is equipped with a multi-tap ECM motor. For
alternate motor tap selections see Table 15, (page 29) &
Table 16, (page 30).
Burner Adjustments
CAUTION:
• Adjustment must be made only by a qualified
technician. Improper air adjustment may
cause unsafe operation, explosion and/or fire
asphyxiation.
• If the input to the furnace is too great because
of excessive gas pressure, wrong size nozzle or
orifice, high altitude, etc., the burner flame will
be sooty and can produce carbon monoxide,
which could result in unsafe operation,
explosion and/or fire or asphyxiation.
Burner settings are made at the factory. However, these
settings may change during shipping, handling, and
installation. The following items should be checked and
readjusted if necessary.
Gas Pressure
The gas pressure can be checked with a manometer at
the pressure tap located on the top of the gas valve.
Natural gas manifold pressure should be 3.5” W.C. and
L.P. gas manifold pressure should be 10” W.C. Replace
the gas pressure tap plug on the gas valve. See Figure
27 (page 17).
6. The manifold pressure must be verified for each
installation by a qualified installer, service agency or
the gas supplier. See page 19.
Verifying & Adjusting Temperature Rise
Confirm the temperature rise through the furnace is
within the limits specified on the furnace rating plate. Any
temperature rise outside the specified limits could result
in premature failure of the heat exchanger.
1. Place thermometers in the return and supply air stream
GAS CONTROL KNOB
Figure 29. Direct Ignition Gas Valve - Honeywell
21
OPERATING SEQUENCE
Direct Ignition Furnaces
1. On a call for heat, the thermostat contacts close,
supplying 24 VAC between terminals C and W of the
control module.
2. When the inducer starts, the air pressure switch closes.
differential pressure and energizes the gas valve.
3. After a 45 second purge, the control energizes the Hot
Surface Ignitor (HSI) output for the appropriate warm-up
time. After warm up, the gas valve opens. NOTE: The
time for ignition is approximately 6 seconds, after which
the gas valve either remains open if flame is sensed,
or closes if flame is not sensed.
4. If flame is not sensed, the sequence repeats four more
times before a lockout occurs. To reset, wait 30 seconds
and then interrupt the 24 VAC power by turning the room
thermostat below room temperature, then returning it
to the original set point.
5. If flame does not establish on the 5th attempt (initial
fire + 4 re-tries), the control de-energizes the gas valve,
the red LED flashes 4 times, and the furnace locks out
heat operation for 1 hour. See Table 7 and Table 8,
(page 22).
6. If a flame is present, the control energizes the main
blower on heat speed 30 - 45 seconds after the gas
valve opens.
WARNING:
Should overheating occur or the gas supply fails
to shut off, shut off the manual gas valve to the
furnace before shutting off the electrical supply.
7. When call for heat is satisfied the thermostat contacts
open, the gas valve shuts off gas flow and the combustion
blower remains on for a 30 - 45 second post-purge
period.
8. The main blower is de-energized after a 120 - 150
second blower off delay.
TROUBLESHOOTING
High Gas Bills
a. Verify the proper orifice is being used. See Table 6,
(page 17).
b. Check the return air system. Is it clear and free of
blockage?
c. Check the furnace filter. Is it clean or need replacing?
d. Verify the home is insulated, windows and doors fit tightly,
and there are no leaks in the heating duct system.
e. Check the room thermostat. Is the setting higher than
necessary?Low humidity requires higher temperatures
for the same level of comfort. Check for proper humidity
level in the home.
Burner Motor won’t Run - T-stat Calls for Heat
1. Check the electrical supply to the furnace.
2. Verify the furnace On-Off switch is in the ON position.
See Figure 27 (page 17) or Figure 29 (page 21).
3. Defective thermostat circuit - white and red thermostat
low voltage leads. If the combustion fan runs, check:
• Thermostat connections
• Thermostat
22
CONTROL MODULE STATUS INDICATORS - MG1 SERIES
RED LED
INDICATOR
STATUS
Steady ON
Control OK
Steady OFF
No power
Rapid flash
False flame or internal control fault
One flash
Limit switch is open
Two flashes
Pressure switch is open
Three flashes
Pressure switch is stuck closed
Four flashes
Lockout due to failed ignition
Five flashes
L1 neutral reversed or L1 voltage not present
on L1
Flame Status - A Yellow LED labeled “Flame” is provided to indicate
flame status. When flame is sensed, the flame LED is lit. If flame sense
is weak, yellow LED will flash.
Table 7. Nordyne/UTEC Control Board
Fault Conditions
RED LED
FLASH
ERROR/CONDITION
1
System Lockout (Retries Exceeded)
2
Pressure Switch Stuck Closed
3
Pressure Switch Stuck Open
4
Open High Temperature Limit Switch
5
Flame Sensed > 4.25 Seconds with Gas Valve
De-Energized
6
Open Flame RO Switch
8
Igniter Relay Fault
10
Open Fuse
11
Igniter Open
12
Inducer Relay Error
Flash codes NOT stored in memory
7
Low Flame Sense Signal
9
Twinning Fault
Off
Control Failure / No Power / Internal Fault / IRQ Loss
Gas Heating Lockout (Gas valve energized when it
should be de-energized)
Or Gas Valve De-energized when it should be
Energized
Rapid Flash Reverse Polarity
Continuous
On
Normal Operation
Table 8. Emerson Control Board Fault Conditions
4. No voltage to control module - determine if 24 volts (or
120 volts) is available to the control module. If voltage
is not available check for:
• Blown fuse, defective transformer, circuit breaker, no
electrical supply.
• Limit switch open.
• Loose connections.
Combustion Blower Runs, Ignitor Heats Up
But No Flame
1. Defective pressure switch - check air tube and electrical
connections.
2. Burner in purge mode - allow 75 seconds for flame
establishing period.
3. Check for proper electrical connections at purge timer,
control box, or gas valve.
4. Check for gas supply - gas line valve on, control lever
on.
5. Check for blockage in combustion / vent pipe or heat
exchanger.
120 VAC Is Available At AMP Plug Ignitor Does Not Heat Up
Burner Flame Without Motor Running
• Gas valve stuck open, check gas valve for proper
operation (replace if necessary) and inspect heat
exchanger.
• Check for 115 volts to the combustion blower motor;
replace if necessary.
• If no power to combustion blower then check wiring and
control module; replace if necessary.
Circulation Air Blower Will Not Operate Even
Though The Burner Does Operate
• Check thermostat G connection to the motor.
• Check 115 Volts wiring to motor.
• Check for a defective motor.
1. Disconnect power to the furnace.
2. Disconnect AMP plug to the ignitor, and check ignitor
resistance with an ohm meter. Set on RX1 scale.
3. Check for continuity from ignitor receptacle to burner.
4. Disconnect ignitor leads at AMP receptacle and check
for 115 volts at the plug during ignition sequence.
5. Replace ignition control if 115 volts is not available at
AMP plug during ignition sequence.
Main Flame Ignites - Burner Locks Out
•
•
•
•
•
Ignition control is not properly grounded.
Defective ignition control.
Improper polarity of 115 volt power supply.
Ignitor has hairline crack.
Improper gas pressure or burner air adjustment is not
allowing flame to contact ignitor tip for flame rectification.
• Misaligned ignitor does not allow flame to contact ignitor
tip for flame rectification.
Burner Short Cycling - Thermostat Calls
for Heat, Limit Switches Closed
•
•
•
•
•
•
Check for polarity.
Check ground.
Check flue.
Check combustion air.
Check gas pressure.
Check orifice.
24 Volts Supplied To Gas Valve During Ignition
- No Main Gas Flow
• Gas valve may be defective. Replace if necessary.
• Gas piping may be plugged. Check for adequate gas
supply to gas valve at union.
Burner Operates - Insufficient Heat
• Check thermostat for proper setting and location.
Thermostat should not be located where it will be affected
by another heat source.
• Check for clean filter and proper air flow.
• Check burner for proper gas firing rate.
• Be sure unit is not undersized for its thermal load.
• Check thermostat anticipator. The nominal setting is
0.4.
23
FURNACE CONTROLS & FUNCTIONS
Furnace On / Off Switch: This switch turns electrical
power to the furnace on and off. The switch must be set
in the ON position for the furnace to operate. If blower
operation is not desired, the furnace On-Off switch may
be set in the Off position to cut the electrical power to the
furnace. See Figure 27 (page 16).
Limit Control: This furnace is protected by two high
temperature safety limit switches. The auxiliary (upper)
limit switch and the high temperature (lower) limit switch
are automatic reset types. If either limit trips, the burner
will shut off. If either limit switch trips off again soon after
resetting, set the furnace On-Off switch to the Off position
and call your authorized serviceman. See Figure 27.
Blower Off Delay: When the blower fan operates under
cooling mode, there is a 40 second delay after the call
for cooling (from the thermostat) is satisfied before the
blower turns off.
Gas Valve: The gas valves for the gas furnaces are a
100% shut-off type and will fail safe, if for some reason
the gas is turned off. The valve is a “slow-open” for MG1
models which means it opens to a low-fire position, and
after a few seconds, “steps-open” to high-fire.
Summer Cooling : The unit is equipped to use a 4-wire
thermostat. When using a 5-wire thermostat, RC and
RH should be jumped (see instructions included with
thermostat). NOTE: The MG1 furnace requires a Y
connection to the furnace. See Figure 32 (page 27) and
Figure 33 (page 28).
MAINTENANCE
Installer Information
OPTIONAL ACCESSORIES
Necessary when the furnace is used with packaged
air conditioners
If an air conditioner is installed that does not use the furnace
blower for air distribution and operates independently o
the furnace, the thermostat system must have an interlock
to prevent the furnace and air conditioner from operating
at the same time. This interlock system usually contains
either a “Heat-Cool” switch which must be turned to one
of the positions to activate heat or cool operation, or a
positive “OFF” switch on the cooling thermostat.
The furnace must also be equipped with an automatic
damper to prevent cold air from being discharged up around
the heat exchanger (p/n 901996 for furnaces without coil
cavity, or p/n 901083 with coil cavity). See Figure 30 or
Figure 31. Cold air may cause condensation inside the
heat exchanger which can rust and lead to early failure.
Optional Add-On Air Conditioning
Whether split system or single package, an energysaving air conditioner is available that has been designed
specifically for manufactured housing applications and can
best handle your home comfort needs. Ask your dealer or
contractor about add-on central air conditioning systems.
Single package unit includes cooling coils, compressor,
and vertical discharge fan. This type of unit connects with
the existing home air duct system (an optional close-off
damper is required with the furnace).
Split system unit with vertical discharge for quiet operation
connects with cooling coil furnace (optional coil cavity
required with “A” model furnaces).
All furnaces need periodic service at the beginning of each
heating season. Call your qualified service contractor for
these items:
• Remove the air circulator and clean all dust and lint
from the unit with a stiff bristle brush.
• Inspect the combustion chamber blower compartment,
flue collar and Roof Jack.
• Check the gas valve (if applicable) and fuel line
connections for leaks.
• Make any adjustments necessary for good operation.
WARNING:
Figure 30. With Coil Cavity Damper
Use of furnace or air conditioning components
that are not included in the certification of
this appliance may create a hazard, invalidate
the certification, and in many states, make
installations illegal. Listed air conditioning
components are specified on the furnace label.
Figure 31. Without Coil Cavity Damper
24
FIGURES & TABLES
Gas Information
GAS FLOW RATES
(CUBIC FEET PER HOUR)
TIME FOR
ONE REVOLUTION
(SECONDS)
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
GAS FLOW RATES
(CUBIC FEET PER HOUR)
CUBIC FEET PER
REVOLUTION OF GAS METER
1
5
10
TIME FOR
ONE REVOLUTION
(SECONDS)
360
300
257
225
200
180
164
150
138
129
120
113
106
100
95
90
86
82
78
75
72
69
67
64
62
60
58
56
1,800
1,500
1,286
1,125
1,000
900
818
750
692
643
600
563
529
500
474
450
429
409
391
375
360
346
333
321
310
300
290
281
3,600
3,000
2,571
2,250
2,000
1,800
1,636
1,500
1,385
1,286
1,200
1,125
1,059
1,000
947
900
857
818
783
750
720
692
667
643
621
600
581
563
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
102
104
106
108
110
112
114
116
118
120
CUBIC FEET PER
REVOLUTION OF GAS METER
1
5
10
55
53
51
50
49
47
46
45
44
43
42
41
40
39
38
38
37
36
35
35
34
33
33
32
32
31
31
30
273
265
257
250
243
237
231
225
220
214
209
205
200
196
191
188
184
180
176
173
170
167
164
161
158
155
153
150
545
529
514
500
486
474
462
450
439
429
419
409
400
391
383
375
367
360
353
346
340
333
327
321
316
310
305
300
Table 9. Gas Flow Rates
CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)
FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60)
NOMINAL PIPE
DIAMETER (IN.)
1/2
3/4
1
1 1/4
1 1/2
10
130
280
520
1,050
1,600
20
90
190
350
730
1,100
30
75
150
285
590
890
Cubic Feet Per Hour Required =
LENGTH OF PIPE RUN (FEET)
40
50
65
55
130
115
245
215
500
440
760
670
60
50
105
195
400
610
70
45
95
180
370
80
40
90
170
350
Input To Furnace (Btu/hr)
Heating Value of Gas (Btu/Cu. Ft.)
NOTE: The cubic feet per hour listed in the table above must be greater than the cubic feet per hour of gas flow required by the furnace. To
determine the cubic feet per hour of gas flow required by the furnace, divide the input rate of the furnace by the heating value (from gas supplier)
of the gas.
Table 10. Gas Pipe Capacities
25
LOCAL HEATING VALUES FOR NATURAL GAS
ALTITUDE
ABOVE
SEA LEVEL
650
700
750
800
850
900
950
1,000
1,050
2,000 FT
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
3,000 FT
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
4,000 FT
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
5,000 FT
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
6,000 FT
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
7,000 FT
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
8,000 FT
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
9,000 FT
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
10,000 FT
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
BTU PER CUBIC FOOT
Table 11. Natural Gas Heating Values
NATURAL GAS - HIGH HEATING VALUE
FURNACE MODELS
ALTITUDE ABOVE
SEA LEVEL
MG1-056
MG1-070
MG1-077
MG1-090
MANIFOLD PRESSURE IS 3.5 IN WC
(GAS VALVE SETTINGFOR NAT. GAS)
0 to 1,999 FT
2,000 to 2,999 FT
3,000 to 3,999 FT
4,000 to 4,999 FT
5,000 to 5,999 FT
6,000 to 6,999 FT
7,000 to 7,999 FT
8,000 to 8,999 FT
9,000 to 9,999 FT
29
29
30
30
30
30
31
31
32
24
26
26
27
28
28
29
29
30
21
23
24
25
26
27
27
28
29
17
18
19
20
21
22
23
24
25
Factory Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Table 12. High Altitude Deration Chart for Natural Gas - High Heating Value
NATURAL GAS - LOW HEATING VALUE
FURNACE MODELS
ALTITUDE ABOVE
SEA LEVEL
MG1-056
MG1-070
MG1-077
MG1-090
MANIFOLD PRESSURE IS 3.5 IN WC
(GAS VALVE SETTINGFOR NAT. GAS)
0 to 1,999 FT
2,000 to 2,999 FT
3,000 to 3,999 FT
4,000 to 4,999 FT
5,000 to 5,999 FT
6,000 to 6,999 FT
7,000 to 7,999 FT
8,000 to 8,999 FT
9,000 to 9,999 FT
29
29
29
29
30
30
30
31
31
24
24
25
26
27
27
28
29
29
21
20
21
22
23
24
25
26
27
17
17
18
19
20
21
22
23
24
Factory Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Table 13. High Altitude Deration Chart for Natural Gas - Low Heating Value
PROPANE GAS
FURNACE MODELS
ALTITUDE ABOVE
SEA LEVEL
MG1-056
MG1-070
MG1-077
MG1-090
MANIFOLD PRESSURE IS 10 IN WC
(GAS VALVE SETTINGFOR LP GAS)
0 to 1,999 FT
2,000 to 2,999 FT
3,000 to 3,999 FT
4,000 to 4,999 FT
5,000 to 5,999 FT
6,000 to 6,999 FT
7,000 to 7,999 FT
8,000 to 8,999 FT
9,000 to 9,999 FT
45
47
47
47
48
48
49
49
50
42
42
43
43
44
44
44
45
46
40
41
42
42
43
43
43
44
45
36
37
38
39
40
41
42
42
43
Conversion Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
Service Orifice Size
NOTES: Includes 4% Input Reduction for Each 1,000 Feet. Reference Sources: ANSI Z223.1, CSA B149.1, NFPA 54, National Fuel Gas Code.
Table 14. High Altitude Deration Chart for Propane Gas
26
FIELD WIRING
LOW VOLTAGE
HIGH VOLTAGE
LEGEND:
1 1
2 2
BLACK
GROUND
SCREW
IGNITOR
NEUTRAL
L1
WIRE NUTS
SUPPLIED
BY
INSTALLER
BLACK
BLACK
BLACK
WHITE
YELLOW
YELLOW
GAS VALVE
YELLOW
WHITE
RED
GREEN
MOTOR
CHOKE
(ON SELECT
MODELS)
BLACK
BLACK
3 2 1
6 5 4
CONTROL
LIGHTS
1 2 3 4 5 N L C G
GRAY
9 6 3
8 5 2
7 4 1
GRAY
C
R
G
W
C
GREEN
GREEN
RED
1 2 3 4 5 6
1 2 3 4 5 6
G
YELLOW
Y
R
WHITE
GRAY
ON/OFF
SWITCH
BLACK
W
BLACK
L
R
BLACK
115V
TRANSFORMER
24V
N
C
HI-LIMIT
Good Flame Signal
Weak Flame Signal
No Flame Signal
YELLOW
Steady ON
Blinking
Steady OFF
1 2
1 2
ORANGE
ORANGE
PRESSURE
SWITCH
COMBUSTION
FAN
Control OK
No Power
False flame or internal control fault
Limit switch is open
Pressure switch is open with inducer on
Pressure switch is closed with inducer off
Lockout due to failed igni„on
115 vac & neutral reversed
CONTROL LIGHT STATUS
RED
Steady ON
Steady OFF
Rapid Flash
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
04/22
(Replaces 10393570)
1039357A
*Refer to blower table for factory heang speed.
AUX. LIMIT
BLUE
FURNACE ELECTRICAL BOX
BLACK
GROUND
SCREW
BLUE
BLUE
RED
ECM
BLOWER
MOTOR
24V
NOTES:
1. Incoming power must be polarized. Observe color coding. (See furnace data label for electrical informaon.)
2. If any of the original wires (as supplied with the appliance) must be replaced, use 105°C Thermoplasc type wire or its equivalent.
3. A wire from “Y” on the thermostat to the furnace is required.
GRAY
WHITE
Gas Direct Ignion Furnace, Heang & A/C Ready.
NEU
WHITE
COM
XFRM
L1
H
C
RED
YELLOW
BLACK
BLACK
WIRING DIAGRAM
Electrical Information
Figure 32. Nordyne/UTEC Board Wiring Diagram
27
Figure 33. Emerson Board Wiring Diagram
FIELD WIRING
LOW VOLTAGE
HIGH VOLTAGE
LEGEND:
Motor
SPEED
Cool
2 1
2 1
1 1
2 2
R
L
BLACK
YELLOW
RED
GRAY
GREEN
Y
R
G
C
Y
T1
T2
T3
T4
T1+T2
T1
T1
T1
6 5
3 2
4
1
9 8 7
12 11 10
Y/
DHUM Y Y1 Y2 W R G C
WHITE
IGN-N
IND-N
EAC-N
120V HUM-N
CIRC-N
XFMR-N
LINE-N
W
Cool Motor SPEED DIPSWITCH SETTING (S1-1, S1-2, S1-3)
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2 3
1
2
3
Position OFF OFF OFF ON OFF OFF ON ON OFF OFF ON OFF OFF OFF ON OFF ON ON ON OFF ON ON ON ON
FURNACE ELECTRICAL BOX
WHITE
WH/BK STRIPE
C
N
WHITE
BK/WH STRIPE
24V
115V
WHITE
BK/WH STRIPE
GROUND
SCREW
WHITE
TRANSFORMER
BLACK
BLACK
CIRC-H
COMBUSTION
FAN
IGNITOR
NEUTRAL
L1
ON/OFF
SWITCH
EAC-H
Fan Motor SPEED DIPSWITCH SETTING (S2-3, S2-4)
1
2
1
2
1
2
1
2
Position OFF OFF ON OFF OFF ON ON ON
Motor
SPEED
G
T1
T2
T4
T1+T2
Fan
Heat Motor SPEED DIPSWITCH SETTING (S2-1, S2-2)
1
2
1
2
1
2
1
2
Position OFF OFF ON OFF ON ON OFF ON
Motor
SPEED
W
T1
T2
T3
T4
Heat
Use copper conductors only.
If any of the original wire as supplied with
the furnace must be replaced, it must be
replaced with wiring material having a
temperature of at least 105 C.
Red LED Flash Error/Condition
Flash codes stored in memory (auto-erased after 14 days)
1
System Lockout (Retries Exceeded)
2
Pressure Switch Stuck Closed
3
Pressure Switch Stuck Open
4
Open High Temperature Limit Switch
5
Flame Sensed>4.25 Seconds with Gas Valve De-Energized
6
Open Flame RO Switch
8
Ignitor Relay Error
10
Open Fuse
11
Ignitor Open
12
Inducer Relay Error
Flash codes NOT stored in memory
7
Low Flame Sense Signal
9
Twinning Fault
Control Failure / No Power / Internal Fault / IRQ Loss
Gas Heating Lockout (Gas valve energized when it should be de-energized)
Off
Or Gas valve De-energized when it should be Energized
Rapid Flash Reverse Polarity
Continuous On Normal Operation
WIRE NUTS
SUPPLIED
BY
INSTALLER
BLACK
Refer to the Installation Instructions
provided with the furnace for the
proper heating and cooling speeds
for your application.
WHITE
RED
BLUE
ORANGE
HI-LIMIT
RED
GAS VALVE
BLACK
GRAY
ORANGE
BLUE
ECM
BLOWER
MOTOR
FLAME SENSOR
PRESSURE
SWITCH
AUX. LIMIT
BLUE
1 2 3 4 5 6
1 2 3 4 5 6
YELLOW
RED
02/23
(REPLACES 10436620)
1043662A
*Refer to blower table for factory hea ng speed.
GROUND
SCREW
GREEN
1 2 3 4 5 N L C G
GREEN
NOTES:
1. Incoming power must be polarized. Observe color coding. (See furnace data label for electrical informa on.)
2. If any of the original wires (as supplied with the appliance) must be replaced, use 105 C Thermoplas c type wire or its equivalent.
3. A wire from “Y” on the thermostat to the furnace is required.
120V HUM-H
BLACK
BLACK
YELLOW
WHITE
Gas Direct Igni on Furnace, Hea ng & A/C Ready.
YELLOW
LINE-H
GREEN
BLACK
GRAY
WIRING DIAGRAM
GREEN
28
XFRM-H
YELLOW
COM
X
T4
T3
T2
T1
Airflow Data
MG1E-056F1A(A,B)M1
MODEL NAME/
HEATING INPUT
MG1E-056F1AAM1
56,000 BTU/Hr
MOTOR
SPEED
5 - High
4 - Alternate
3 - Med-Hi*
2 - Med-Low
1 - Low
0.1
CFM
RISE
890
798
47
52
EXTERNAL STATIC PRESSURE (IN. W.C.)
0.2
0.3
0.4
CFM
RISE
CFM
RISE
CFM
RISE
843
749
49
55
928
790
695
45
53
60
876
735
629
47
56
66
0.5
CFM
RISE
829
683
50
61
MG1E-070F1A(A,B)M1
MODEL NAME/
HEATING INPUT
MG1E-070F1AAM1
70,000 BTU/Hr
MOTOR
SPEED
5 - High
4 - Alternate
3 - Med-High*
2 - Med-Low
1 - Low
0.1
CFM
RISE
1,212
931
43
56
EXTERNAL STATIC PRESSURE (IN. W.C.)
0.2
0.3
0.4
CFM
RISE
CFM
RISE
CFM
RISE
CFM
RISE
1,178
886
1,079
732
48
71
44
59
1,148
836
45
62
1,114
782
47
66
0.5
MG1E-077F1AAM1
MODEL NAME/
HEATING INPUT
MG1E-077F1AAM1
77,000 BTU/Hr
MOTOR
SPEED
5 - High
4 - Alternate
3 - Med-High*
2 - Med-Low
1 - Low
0.1
CFM
RISE
1,212
996
47
57
EXTERNAL STATIC PRESSURE (IN. W.C.)
0.2
0.3
0.4
CFM
RISE
CFM
RISE
CFM
RISE
CFM
RISE
1,178
960
1,079
848
53
67
48
59
1,148
924
50
62
1,114
885
51
64
0.5
MG1E-090F1AAM1
MODEL NAME/
HEATING INPUT
MG1E-090F1AAM1
85,000 BTU/Hr
1.
2.
3.
4.
5.
6.
MOTOR
SPEED
5 - High
4 - Med-High
3 - Med-Low*
2 - Alternate
1 - Low
0.1
CFM
RISE
1,188
1,015
56
66
EXTERNAL STATIC PRESSURE (IN. W.C.)
0.2
0.3
0.4
CFM
RISE
CFM
RISE
CFM
RISE
1,154
978
58
68
1,119
956
60
70
1,091
917
61
73
0.5
CFM
RISE
1,054
63
NOTES:
To comply with government mandated efficiency standards, two openings are required for airflows above 1,600 CFM.
Data is shown without filter.
Temperature rises in the table are approximate. Actual temperature rises may vary.
Individual cells shaded in gray indicate a temperature rise outside of the recommended range.
To comply with government mandated efficiency standards, speed settings shaded in gray are not allowed in HEAT mode.
The “*” denotes the factory heat and cool setting. If a different motor speed is needed, the appropiate wire from the “HEAT” or “COOL” tap
on the control board must be connected to the desired Tap (1-5) at the motor.
Table 15. Heating Airflow (CFM) & Temperature Rise (°F)
29
MG1E-056F1AAM1
MODEL NAME/
HEATING INPUT
MG1E-056F1AAM1
56,000 BTU/Hr
MOTOR
SPEED
5 - High*
4 - Alternate
3 - Med-High
2 - Med-Low
1 - Low
0.1
CFM
1,524
1,199
1,013
890
798
EXTERNAL STATIC PRESSURE (IN. W.C.)
0.2
0.3
0.4
0.5
0.6
0.7
CFM
CFM
CFM
CFM
CFM
CFM
1,491
1,458
1,421
1,385
1,348
1,308
1,160
1,122
1,080
1,037
993
946
972
928
876
829
780
728
843
790
735
683
615
566
749
695
629
442
369
0.8
CFM
1,270
899
675
510
MG1E-070F1AAM1
MODEL NAME/
HEATING INPUT
MG1E-070F1AAM1
70,000 BTU/Hr
MOTOR
SPEED
5 - High*
4 - Alternate
3 - Med-High
2 - Med-Low
1 - Low
0.1
CFM
1,573
1,387
1,212
931
640
EXTERNAL STATIC PRESSURE (IN. W.C.)
0.2
0.3
0.4
0.5
0.6
0.7
CFM
CFM
CFM
CFM
CFM
CFM
1,541
1,511
1,479
1,452
1,419
1,388
1,353
1,321
1,289
1,254
1,216
1,183
1,178
1,148
1,114
1,079
1,036
1,005
886
836
782
732
670
620
599
562
513
476
425
0.8
CFM
1,358
1,148
964
565
MG1E-077F1AAM1
MODEL NAME/
HEATING INPUT
MG1E-077F1AAM1
77,000 BTU/Hr
MOTOR
SPEED
5 - High*
4 - Alternate
3 - Med-High
2 - Med-Low
1 - Low
0.1
CFM
1,573
1,333
1,212
996
683
EXTERNAL STATIC PRESSURE (IN. W.C.)
0.2
0.3
0.4
0.5
0.6
0.7
CFM
CFM
CFM
CFM
CFM
CFM
1,541
1,511
1,479
1,452
1,419
1,388
1,300
1,268
1,236
1,201
1,162
1,129
1,178
1,148
1,114
1,079
1,036
1,005
960
924
885
848
814
772
642
599
540
498
451
386
0.8
CFM
1,358
1,093
964
734
MG1E-090F1AAM1
MODEL NAME/
HEATING INPUT
MG1E-085F1AAM1
85,000 BTU/Hr
MOTOR
SPEED
5 - High*
4 - Med-High
3 - Med-Low
2 - Alternate
1 - Low
0.1
CFM
1,590
1,337
1,188
1,015
779
EXTERNAL STATIC PRESSURE (IN. W.C.)
0.2
0.3
0.4
0.5
0.6
0.7
CFM
CFM
CFM
CFM
CFM
CFM
1,555
1,521
1,493
1,458
1,426
1,397
1,306
1,274
1,243
1,210
1,182
1,142
1,154
1,119
1,091
1,054
1,023
984
978
956
917
871
834
792
742
698
654
617
564
516
NOTES:
0.8
CFM
1,371
1,104
941
740
472
1. To comply with government mandated efficiency standards, two openings are required for airflows above 1,600 CFM.
2. Data is shown without filter.
3. The “*” denotes the factory heat and cool setting. If a different motor speed is needed, the appropiate wire from the “HEAT” or “COOL”
tap on the control board must be connected to the desired Tap (1-5) at the motor.
Table 16. Cooling Airflow (CFM)
30
31
INSTALLATION CHECKLIST
INSTALLATION ADDRESS:
CITY:
ELECTRICAL SYSTEM
STATE:
UNIT MODEL #
YES
NO
Line voltage polarity correct?
YES
NO
Supply Voltage:_________________________________ VOLTS
UNIT SERIAL #
Unit Installed Minimum clearances
per Table 1, (page 6)?
Electrical connections tight?
YES
NO
Has the thermostat been calibrated?
YES
NO
Is the thermostat level?
YES
NO
Is the heat anticipator setting correct?
YES
NO
Natural
Gas
Propane
YES
NO
INSTALLER NAME:
CITY:
GAS SYSTEM
STATE:
Has the owner’s information been
reviewed with the customer?
YES
NO
Has the Literature Package been
left with the unit?
YES
NO
ATTENTION INSTALLERS:
It is your responsibility to know this product better than your customer.
This includes being able to install the product according to strict
safety guidelines and instructing the customer on how to operate
and maintain the equipment for the life of the product. Safety should
always be the deciding factor when installing this product and using
common sense plays an important role as well. Pay attention to
all safety warnings and any other special notes highlighted in the
manual. Improper installation of the furnace or failure to follow safety
warnings could result in serious injury, death, or property damage.
These instructions are primarily intended to assist qualified individuals
experienced in the proper installation of this appliance. Some local
codes require licensed installation/service personnel for this type of
equipment. Please read all instructions carefully before starting the
installation. Return these instructions to the customer’s package for
future reference.
Gas Type: (circle one)
Gas pipe connections leak-tested?
Gas Line Pressure:......................................................... (in - W.C.)
Installation Altitude:............................................................(FT.)
Deration Percentage:..........................................................(%)
Furnace Input:....................................................................(Btuh)
Supply Air Temperature: ....................................................(° F)
Return Air Temperature: ....................................................(° F)
Temperature Rise: .............................................................(° F)
COMBUSTION AIR & VENTING SYSTEM
Is there adequate fresh air supply
for combustion & ventilation?
YES
NO
Vent free from restrictions?
YES
NO
Filter(s) secured in place?
YES
NO
Filter(s) clean?
YES
NO
Flue connections tight?
YES
NO
Is there proper draft?
YES
NO
Specifications & illustrations subject to change without notice or incurring obligations (03/23).
O’Fallon, MO, © Nortek Global HVAC LLC 2023. All Rights Reserved.
1043635A
(Replaces 10436350)
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