Nordyne M1B User manual

Installation Instructions
Series M1B, M1G, M1M & M5S
Downflow, Direct Vent (Sealed Combustion)
Forced Air Gas & Oil Furnaces
WARNING:
!
DO NOT DESTROY. PLEASE READ CAREFULLY AND KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
ATTENTION INSTALLERS:
It is your responsibilit y to know this pro duc t
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.
For installation in:
• Manufactured Homes
• Recreational Vehicles, Park Models, &
Manufactured Buildings
• Modular Homes/Buildings
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
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings
exactly could result in serious
injury 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.

2
SAFETY INFORMATION .............................. 3
REQUIREMENTS & CODES ........................ 3
GENERAL INFORMATION........................... 5
Warranty Information ................................ 5
Minimum Clearances ............................... 5
Applications ............................................. 6
Unit Location ............................................ 6
CIRCULATING AIR REQUIREMENTS......... 7
Return Air Connections ........................... 7
Supply Air Connections ............................ 7
FURNACE INSTALLATION .......................... 8
General Information.................................. 8
Requirements & Codes ............................ 8
Locating & Cutting Duct Openings .......... 8
Standard Duct Connector Installation....... 9
Alternate Attachment Method ...............10
Round Duct Connector Installation..........10
Installing the Furnace ..............................10
ROOF JACK INSTALLATION......................11
Roof Jack Selection.................................11
Application Notes.....................................11
Locating & Cutting Roof Openings ..........12
Installing the Roof Jack............................13
Installation of Transit-Mode Vent System.13
Manufactured Home Factory.................13
ELECTRICAL INFORMATION.....................14
Line Voltage Wiring..................................14
Connecting Power Supply Wires...........15
Low Voltage Wiring ..................................15
Connecting Thermostat Wires...............15
Verifying Anticipator Setting..................15
Grounding................................................15
FUEL SUPPLY AND PIPING .......................16
Oil Tank & Piping Istallation .....................17
One Line System ..................................17
Two Line System...................................17
Fuel Line Hook Up ..................................17
Leak Check .............................................18
Priming Honeywell R7184 ......................18
Priming Beckett 7505 ..............................18
Fuel Oil Type ...........................................18
Conversion to Propane Gas ...................18
Atmospheric & Direct Ignition ..............18
High Altitude Conversion ........................19
Flue Gas Sampling .................................19
STARTUP & ADJUSTMENTS .....................20
Lighting Instructions - Pilot Models..........20
How to Shut Off Gas - Pilot Models......21
Operating Instructions - Direct Ignition ...21
How to Shut Off Gas - Direct Ignition ...22
Operating Instructions - Oil Gun ..............22
Operating Instructions - Gas Gun............22
How to Shut Off Gas - Gas Gun...........22
Burner Adjustments.................................22
Gas Pressure .......................................22
Pilot Flame ...........................................22
Combustion Air ........................................23
Gas Gun ...............................................23
Oil Gun .................................................23
Electrode Setting - Oil Gun......................23
Switching Honeywell (R7184) Ignition from
Interrupted to Intermittent ........................23
OPERATING SEQUENCE ...........................24
Standing Pilot ..........................................24
Standing Pilot w/ Induced Draft Blower ...24
M1 Models - Direct Ignition......................24
Oil Gun Models........................................24
Gas Gun Models......................................24
FURNACE CONTROLS & FUNCTIONS .....25
Furnace On-Off Switch............................25
Limit Control ............................................25
Gas Valve.................................................25
Roll Out Switch - M1G .............................25
Oil Burner Primary Control ......................25
Summer Cooling - B,C,D Series ..............25
TROUBLESHOOTING .................................26
Standing Pilot Models..............................26
Direct Ignition Models ..............................26
Oil Gun Models........................................27
OPTIONAL ACCESSORIES........................28
MAINTENANCE...........................................30
Homeowner Information ..........................30
Installer Information Information ..............30
FIGURE & TABLES......................................31
Table 10 - Furnace Specifications ........31
Table 11 - Orifice Sizes - High Alt.........32
Table 12 - Blower Speed Selection.......32
Gas Information .......................................33
Table 13 - Gas Flow Rates ...................33
Table 14 - Gas Pipe Capacities ............33
Wiring Diagrams ......................................34
Fig. 39 - Gas Furnace - 056, 070 .........34
Fig. 41 - Standing Pilot - 077, 090 ........35
Fig. 42 - Gas Furn. w/ac 056, 070 ........36
Fig. 43 - Standing Pilot. w/ac 077, 090 .37
Fig. 44 - Gas Only (M1M Models) ........38
Fig. 45 - Gas & Oil (M1B & M5S) .........39
Installation Checklist................................40

3
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 per
sonal injury
or death
.
• 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 5).
• Provide adequate combustion air to the furnace
space as specified on page 23.
• Combustion products must be discharged
outdoors.Connect this furnace to an approved
vent system, as specified on pages 13 - 14.
• Never test for gas leaks with an open flame.
Use a commercially available soap solution to
check all connections (page 18).
• This furnace is designed to operate with a
maximum external pressure rise of 0.5 inches
of water column. Consult Table 8 (page 38),
and the rating plate for the proper circulating
air flow and temperature rise.
NOTE: 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.
• This furnace may not be used for temporary
heating of buildings or structures under
construction.
• When supply ducts carry air circulated by the
furnace to areas outside the space containing
the furnace, the return air shall also be handled
by duct(s) sealed to the furnace casing and
terminating outside the space containing the
furnace. See page 14.
REQUIREMENTS AND 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/CGA B149.1.
CE générateur d’air chaud doit être installé
conformément aux instructions du fabricant
et aux codes locaux. En l’absence de code
local, respecter la norme ANSI Z223.,1,
institulé National Fuel Gas Code ou les codes
d’installation CAN/GCA-B149.
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:
WARNING:
Do not use this appliance if any
part has been submerged under
water. Immediately call a qualified
service technician to inspect the
appliance and to replace any part
of the control system and any gas
control that has been submerged
underwater.
Notice to Installer
Installer is advised to carefully follow all
instructions and warnings in this manual to insure
maximum performance, safety, and operating
efficiency of these appliances. Improper
installation may create hazardous conditions,
and will void the appliance warranty.
PROPOSITION 65 WARNING:
This product contains chemicals
known to the state of California
to cause cancer, birth defects or
other reproductive harm.
WARNING:

4
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”.
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).
b.) The (CO) detector shall:
• Be located in the room that houses
the appliance or 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 the appliance or equipment
at the completion of the installation.
The 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 and Ventilation Air
• US: National Fuel Gas Code (NFGC), Air for
Combustion and Ventilation
• CANADA: Natural Gas and Propane Instal-
lation 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 Hand-
book
Electrical Connections
• US: National Electrical Code (NEC) ANSI/
NFPA 70
• CANADA: Canadian Electrical Code CSA
C22.1
Gas Piping and Gas Pipe Pressure Testing
• US: NFGC and National Plumbing Codes
• CANADA: NSCNGPIC
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).

5
• American National Standard (ANSI-119.2/
NFPA-501C) for all recreational vehicle
installations.
• CANADA: CAN/CGA-B149.1 and .2–M00
National Standard of Canada. (NSCNGPIC)
GENERAL INFORMATION
Manufacturer Warranty - Owner’s
Responsibilities
It is the sole responsibility of the homeowner to
make certain the gas furnace has been correctly
set up and converted to the proper fuel (L.P. gas
or Natural gas) and adjusted to operate properly.
All gas furnaces are manufactured for Natural gas
and must be field converted when using L.P.gas.
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, ex-
plosion, fire and/or asphyxiation.
• If furnace malfunctions or does
not operate properly, contact a
qualified service agency or gas
utility for assistance.
A warranty certificate with full details is included
with these instructions. However, NORDYNE
will not be responsible for any costs found
necessary to correct problems due to improper
setup, improper installation, furnace adjustments,
improper operating procedure on the part of the
user, etc. Carefully review these responsibilities
with your manufactured housing dealer, service
company or gas supplier.Some specific examples
of service calls which cannot be included in
warranty payments are:
• Converting the furnace to use another type of
gas.
• Repairing duct work in the home found to be
faulty.
• Correcting wiring problems in the electrical
circuit supplying the furnace.
• Resetting circuit breakers, blown fuses or other
switches.
• Correcting problems due to improper gas
supply pressure to the furnace.
• Providing instructional training on how to light
and operate the furnace.
• Furnace problems caused by installation of an
air conditioner, heat pump or other air comfort
devices.
• Adding a Roof Jack extension because of
unusual wind and/or snow conditions.
• Revising installation of the furnace flue
assembly (Roof Jack).
• Adjusting or calibrating of thermostat.
• Any construction debris which falls into flue
system.
Minimum Clearances
This heating appliance must be installed with
clearances not less than the minimums listed
in Table 1. This furnace must be installed with
ample clearance for easy access to the air filter,
blower assembly, burner assembly, controls, and
vent connections. See Figures 1 - 3 (page 6).
• 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).
• 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 sq.in.when
located 6” from furnace or 390 sq. in. for 5 ton
ready M1/M5 furnaces. For special clearance
between 1”and 6”, requirements are a louvered
door with a minimum of 250 sq. in. 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 (page 7).
Table 1. Minimum Clearances
ALL MODELS 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
B Cabinet 0” 0”
A Cabinet
(w/ coil box) 0” 0”
A Cabinet
(w/o coil box) 1/4” 1/4”

6
Figure 4. Overall Dimensions
“A”- 56"
23 3/4"
“B”- 76"
19 3/4"
“A” Model
w/o Coil
Cabinet
“B” Model
w/Coil
Cabinet
Applications
M1 Series gas and M5 Series oil furnaces are
listed direct vent (sealed combustion), downflow
heating appliances for manufactured (mobile)
homes, recreational vehicles, and for use in
residential/modular/commercial construction.
The furnace must be located so that venting can
be properly achieved.
Air conditioning may be added to structures with
M1/M5 series furnaces using air conditioning or
conventional units. This Installation Instruction
manual includes special requirements for
incorporation of air conditioning equipment to the
M1/M5 series of furnaces.SeeTabel 12 (page 32).
Multi-speed blower assemblies shown in Table
2, have been certified for field installation in M1/
M5 Series furnaces.
Unit Location
• The furnace shall be appropriately located to
the supply and return air distribution system
(See Page 7). Sides and back of the furnace
may be enclosed by wall framing.See Minimum
Clearances (page 2) and Figures 1- 3.
• 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 NORDYNE Duct
Connectors. See pages 9 & 10.
• 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.
Table 2. Blower Assemblies
Part
No.
Blower / Motor
Assembly A/C Capacity
(Tons)
Blower
Wheel
Motor
(Hp)
903773 10 x 8 1/4 2, 2½ & 3
903413 11 x 8 1/2 2, 2½, 3 & 4
903890 11 x 8 3/4 2, 2½, 3, 4 & 5
Removable access
panel should be
installed above
furnace door frame
to access roof jack
Nearest
Wall or
Partition
18"
(457 mm)
6" (152 mm)
Top Clearance
0" Side
Clearance
to Furnace
Cabinet
6" (152 mm)
Top Clearance
0" Side
Clearance
to Furnace
Cabinet
Provide min. 235
sq. in. (1516 cm )
open free area in
front or side wall
2
or
In closet
door
located
at top,
center
or bottom
CLOSET DOOR
6" (152 mm)
Top Clearance
Provide min. 250
sq. in. (1613 cm )
open free area in
front or side wall
2
a fully
louvered
door may
be used
CLOSET DOOR
6"
(152 mm)
1"
(25 mm)
0" Side
Clearance
to Furnace
Cabinet
or
in closet
door
Figure 3. Special 1” Clearance
Figure 2. Closet Installation
Figure 1. Alcove Installation

7
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.
All return ductwork must be secured
to the furnace with sheet metal screws.
For installations in confined spaces,
all return ductwork must be adequately
sealed.The joint between the furnace
and the return air plenum must be
air tight.
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.
Return air and 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 Connections
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
square inches (or 390 square inches for 5 ton
ready M1/M5 Furnaces).
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 least 235 sq. in. 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 air-circulating 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 ob-
tain necessary airflow. Use NORDYNE’s
certiduct program to determine proper duct
size for A/C.
Supply Air Connections
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.

8
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 heated space by duct(s)
secured to the furnace casing, running full
size and without interruption.
Three typical distribution systems are shown
in Figure 5. The location, size, and number of
registers should be selected on the basis of
best air distribution and floor plan of the home.
Figure 5. Typical Supply Duct System
A Single trunk duct
BDual trunk duct
w/crossover connector
C
Transition duct
w/branches
FURNACE INSTALLATION
NOTE: These Installation procedures are
suggested for typical furnace installations.
Since all installations are different from each
other, the sequence of instructions may differ
from the actual installation. Only qualified HVAC
technicians should install this furnace.
General Information
• 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 and Figure 3 (page 6)
• The furnace must be installed upstream from
a refrigeration system.
• The plenum attached to the A/C coil box and
ductwork within 3 ft. of the furnace must be
installed so that surfaces are at least 1/4” from
combustible construction.
• The cabinet plug must always be used to close
the hole in the side of the furnace when rotating
the inducer.
•
M1/M5 models must be installed with the Nordyne
A/C coil box which are listed according to the
cabinet size of the furnace: “B” cabinet - 920169,
“C”cabinet - 920171, and“D” cabinet - 920172.
• The M1 Series gas and M5 Series oil furnace
is 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.
Requirements and Codes
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.
• 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 researched under standards
UL 307A & B, UL727-1999, ANSI Z21.47b/
CSA 2.3b-2008, and CSA B140.10.
Locating and 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 9). For round ducts, see Figure 7.
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 Figures 6 or 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 9) will
determine the correct duct connector.
5. Determine which duct connector to use from
Table 3 (page 9).
6.
Measure and drill gas hole. and cut out for cooling
coil (if applicable). See Figures 6 or 7 (page 9).

9
FLOOR CUT-OUT
FOR STANDARD
DUCT CONNECTORS
C
L
C
L
C
L
24"
23 1/4"
21 3/4" 14 1/2"
2 1/4"
2 3/4"
20"
CUT-OUT FOR
OPTIONAL
COOLING COIL
REAR WALL OF CLOSET OR ALCOVE
1 3/4"
2"
3/4"
C
L
C
L
C
L
10"
C
L
FURNACE OUTLINE
14 1/2"
ALT FUEL-LINE
ENTRY 1 1/4" Dia.
FURNACE
OUTER
DOOR
FUEL
LINE
1 3/4"
3/4"
1 7/8"
2 7/8"
Figure 6. Cut-Out Dimensions for
Standard Duct Connectors
FLOOR
CUT-OUT FOR
ROUND DUCT
(14 1/4” DIAMETER)
C
L
C
LC
L
C
L
24"
23 1/4"
21 3/4"
20"
CUT-OUT FOR
OPTIONAL
COOLING COIL
ALT FUEL-LINE
ENTRY 1 1/4" Dia.
FURNACE
OUTER
DOOR
REAR WALL OF CLOSET OR ALCOVE
FUEL
LINE
1 3/4"
2"
3/4"
C
L
C
L
10"
FURNACE OUTLINE
1 3/4"
10"
3/4"
1 7/8"
2 7/8"
C
L
Figure 7. Cut-Out Dimensions for
Round Duct Connectors
Bend tabs
up 90°
Mounting Plate
Duct
Connector
Connector
Tabs
Supply
Air Duct
Hole for
Gas Line
Wood Floor
Figure 8. Standard Duct Connector In-
stalled
If Floor Cavity
“X” is:
Duct Connector
Type & Part Number
Standard Duct Round Duct
7/8” / (22) 901987A 904008
2” / (51) 901988A 904009
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 3. Duct Connector Sizes
“X”
FLOOR OPENING
FLOOR
CAVITY
SUPPLY AIR DUCT
Figure 9. Floor Cavity
Standard Duct Connector Installation
The standard duct connector is designed for use
on ducts 12” in width. However ducts narrower
than 12” may not allow sufficient clearances
for this type of installation. For an alternate
installation method, see page 10.
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 (Figure 8) of the
duct connector.
3. Remove the duct connector and cut out the
marked area of the supply air duct 1/4” larger
the actual cutout drawn.
4. Install the duct connector back in the floor
opening with the bottom tabs extending into
the supply air duct.
5. Install the mounting plate (Figure 8) under
the back side of the duct connector. 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 on the mounting plate up 90°.
See Figure 10, (page 10)
9. 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.

10
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 (Figure 11).
With Option 1 choice, 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 (Figure 12).
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.
DUCT CONNECTOR
SUPPLY
AIR DUCT
BEND TABS TIGHTLY
AGAINST SUPPLY AIR DUCT
Figure 10. Duct Connector Tabs
Narrow
Duct
Narrow
Duct
Duct connector tabs Staples or sheet metal screws
Duct
Flap
Narrow
Duct
Duct
Connector
Sheet metal
screws
Figure 12. Narrow Ducts
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 11).
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.
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.
Figure 11. Narrow Air Duct Openings
OPTION 1 OPTION 2
Supply
Air Duct
Fold Flap Here
Fold Flap Here
Remove
this
Flap
Remove
this
Flap
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Fold Flap Here
Fold Flap Here
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
and the installation clearances outlined on page
2 and Figures 1 - 4 (page 6). The furnace shall
be appropriately connected to the supply and
return air distribution system as shown in Figures
14 & 15 (page 11).
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 (Figures 14 or 15).
NOTE: Additional fasteners may be used at rear,
sides or through door frame, as desired, to secure
furnace to closet or alcove framing.

11
Figure 13. Round Duct Connector Installed
DUCT
CONNECTOR
MOUNTING
PLATE
SCREWS
FUEL
LINE
HOLES
14” SUPPLY
CONNECTION
Table 4. Roof Jack Assemblies
SSAW T27 47 - 2
AW= ALL WEATHER FLASHING
PITCH/12" RISE
0=FLAT
2=2.5/12
4=4/12
MIN. ADJ.
LENGTH
F = FLAT FLASHING
S = SLANT FLASHING
TYPE:
BLANK = NON-TRANSIT
T= TRANSIT MODE MAX. ADJ.
LENGTH
FLUE STEEL TYPE
A= ALUMINIZED
S=STAINLESS
MODEL NUMBER APPROX. LENGTH
BELOW FLASHING
(F,S)AW(T)1523-(0,2,4)(A,S) 15” - 23”
(F,S)AW(T)2135-(0,2,4)(A,S) 21” - 35”
(F,S)AW(T)2747-(0,2,4)(A,S) 27” - 47”
(F,S)AW(T)3563-(0,2,4)(A,S) 35” - 63”
(F,S)AW(T)5195-(0,2,4)(A,S) 51” - 95”
MTG. PLATE TABS SLIDE FURNACE
ALL THE WAY BACK
ONTO MTG. PLATE
SUPPLY AIR DUCT
Knockout Over Holes
SECURE FURNACE
WITH 2 FASTENERS AT FRONT
CORNER HOLES
Figure 14. “A” & “B” Cabinet Furnaces
FUEL LINE HOLES
MTG. PLATE TABS
SLIDE FURNACE
BACK AGAINST
MTG. PLATE
SECURE FURNACE
WITH 2 FASTENERS
AT FRONT CORNER HOLES
SUPPLY
AIR DUCT
Figure 15. “A” Cabinet Furnace on Coil
Cabinet
ROOF JACK INSTALLATION
Required ceiling and roof cut-out openings (see
Figure 11) must be carefully located to avoid
misalignment of the furnace and Roof Jack.
Note: Install only Roof Jack Assemblies listed
in Table 4 on this heating appliance.
Roof Jack Selection
1. Determine depth of ceiling cavity from center
of roof opening to center of ceiling opening.
(See Dimension “A” in Figure 16.)
2. Determine ceiling height and subtract height
of furnace. (See Dimension “B” in Figure 16.)
3. Add dimensions A + B (and X from Table 5
and Figure 18 if slant deck flashing is used).
The total length of (A + B + X) must be within
the minimum and maximum range of one of
the Roof Jacks listed in Table 4.
Application Notes:
• FAW, FAWT, SAW and SAWT Series Roof
Jacks with a 5” diameter inner vent pipe may
be used with all models of M1 Series gas and
M5 Series oil furnaces.
F = Flat Flashing: flexes from 0/12 to 1/12 roof
slope. See Figure 17 (page 12).
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.
• Stainless steel roof jacks are available.
• M1/M5 furnaces may be used with roof jacks
as tall as 170” (except M1M 056 & M1B 066
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.
NOTE: If the roof jack crown is covered or blocked
with snow, the furnace will not operate properly.
Figure 16. Ceiling Cavity Depth
ROOF JACK
SLANT DECK
FLASHING
PITCHED
ROOF
CEILING
CEILING
CAVITY
Roof
Opening
"X" (SEE TABLE 5)
Flue Pipe
Combustion Air Pipe
56" or 76"
Furnace
“A”
“B”

12
Figure 17. Example of Flat Jack
with Flashing
Figure 18. Example of 2½/12 Slant Jack
with Flashing
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 as follows:
• Ceiling = 8 3/4” (222 mm) diameter
• Roof = 9 3/8” (238 mm) diameter
IMPORTANT:
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.
Table 5. Slant Deck Flashings
Optional Deck Flashings for Flat and 2.5/12 Pitch Roof Jacks. 4/12 Pitch Roof Jacks not applicable.
ROOF JACK SERIES IF ROOF PITCH IS: SLANT DECK
FLASHING NUMBER
“X” FACTOR
IS:
“F Series
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”
“S” Series (2.5 / 12
Pitch only)
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”
CEILING
CUT-OUT FOR
FLUE AND
ROOF JACK
C
L
C
L
24"
20"
13 1/2"
REAR WALL OF CLOSET OR ALCOVE
10"
FURNACE
OUTER
DOOR
FURNACE OUTLINE
Figure 19. Cut-Out Dimensions for
Flue & Roof Jack
If the home is located in regions where snow
accumulation exceeds 7”(HUD snowload zones)
use an external roof jack extension (p/n 901937).
Extensions are optional accessories and may be
purchased through your NORDYNE distributor.
Locating and Cutting Roof & Ceiling Openings
DO NOT ALLOW DEBRIS TO FALL INTO THE
FURNACE. THIS COULD CAUSE UNSAFE
OPERATION AND VOIDS 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

13
Secure roof jack with
appropriate fasteners
after connecting to
furnace
Caulk under roof
flashing to prevent
water leakage
Roof
Ceiling
Optional 2-piece ceiling
ring #902521
Figure 20. Flat Roof
Upper Roof Jack Section
Secure lower roof
jack section with
no. 10 S.M. screws
Caulk under roof
ashing to prevent
water leakage
Optional Slant
Deck Flashing
Secure ashing
with appropriate
fasteners
Ceiling
Figure 21. Pitched Roof
Figure 22. Combustion Air Pipe Connection
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. See Figures 20 or 21.
2. Connect Roof Jack Assembly to the furnace.
Insert telescoping Roof Jack Assembly through
the opening cut on the roof.
3. Connect flue pipe to flue collar of furnace.See
Figure 22.
4. Connect combustion air pipe to furnace collar
with sheet metal screw (See Figure 22).
NOTE: 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.
NOTE: 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 flashing plate and fasteners with approved
roofing compound.
Installation of Transit-Mode Venting System
Manufactured Home Factory
1. Furnace must be installed in accordance to
furnace installation manual.
2. Select appropriate Roof Jack from Table 4
(page 11).
3. Roof Jack (less upper Roof Jack crown), with
weather cap to be installed as described under
Install Roof Jack.
NOTE: Upper Roof Jack crown to be stored in
a prominent location inside manufactured home
until on-site installation.

14
4.The four warning tags supplied must be
installed as follows:
• To weather cap
• To fuel line connection point (Gas) or furnace
burner (Oil)
• To furnace flame observation door (Gas or
Oil)
• To furnace wall thermostat
5. Transit-mode weather cap to be removed and
upper Roof Jack crown installed (See Figure
24). Do Not Discard screws.
6. Place upper Roof Jack (crown) on to the flue
pipe assembly. NOTE: Make sure inside flue
pipe attaches over inner flue pipe and outer
Roof Jack pipe fits over outer pipe.
7. Secure in place using three (3), #10, 1/2”sheet
metal screws removed in step 5. Do not use
the same holes which secured the rain cap in
place.
8. Remove and discard venting system warning
tags.
WARNING:
Failure to properly secure the flue
pipe to the furnace may result in
fire, explosion or asphyxiation
when operating the furnace.
SCREWS
COMPLETED
ASSEMBLY
TO FURNACE
UPPER ROOF
JACK (CROWN)
INNER FLUE
PIPE
FLUE ASSEMBLY
OUTER PIPE
FLASHING
WEATHER CAP
Figure 23. Roof Jack Crown
ELECTRICAL INFORMATION
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.
• 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).
Line Voltage Wiring
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. See Table 10 (page 31).
IMPORTANT NOTE: An electrical disconnect
must be installed readily accessible from and
located within sight of the furnace. Refer to
the wiring diagram inside the control box
cover or Figures 40 - 45 (pages 34 - 39) 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.
Route all electrical wiring to the left side of the
furnace. For installation of “A” 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.

15
Figure 24. Control Panel (All Models)
On-Off
Switch
Blower
Plug
Power
Entry
On-Auto Switch
(Heating Models Only)
Thermostat Wires
Furnace
Control Box
To combustion
Blower or Flame
Roll-out Switch
To Gas Valve
or Burner
Table 6. Thermostat Wire Gauge
Thermostat
Wire Gauge
Recommended T’STAT Wire
Length (Unit to T’STAT)
2-Wire
(Heating)
5-Wire
(Heating/Cooling)
24 55 25
22 90 45
20 140 70
18 225 110
Connecting Power Supply Wires
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.
Low Voltage Wiring
The thermostat must be installed according
to the instructions supplied by the thermostat
manufacturer.Low voltage connections (24VAC)
from the thermostat are wired to the terminal strip
on the integrated control in the furnace.
NOTE: The thermostat must not be installed 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. The nominal anticipator
setting is 0.4. (Refer to the thermostat literature
for additional information.)
Five-conductor thermostat wire is recommended
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 for thermostat
wire information.
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 (see Figure 25).
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.
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.
Figure 25. Thermostat Wiring For
A/C Ready Models
Rc
R
H
W
G
Y
Red
White
Green
Yellow
Red
White
Green
Grey
Thermostat M1/M5 A/C
Ready Furnace
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 wireor conduit approved
for ground service. Do not use gas
piping as an electrical ground!

16
To Gas
Supply
Floor
Control
Panel
On-Off-Fan
Switch
Alt. Fuel
Line Entry
Floor Cavity
Figure 26. Typical Gas Piping
FUEL SUPPLY AND PIPING
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/CGA
B149.1 or .2). Failure to follow all
safety warnings could result in
serious injury, death or property
damage.
This furnace may be installed with left or right
side 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 26. Table 14 (page 37) 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 (Figure 36). 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.
• 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.
• 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 recom-
mended 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.
• A drip leg should be installed in the vertical
pipe run to the unit (Figure 36).
• All piping shall be black iron pipe, or
equivalently sized steel tubing. Internally
tinned copper tubing may be used for gas
supply systems.
Fuel line installations other than typical
installations shown in Figures 26 and 27
(page 17) must comply with the fuel piping
provisions stated in the Federal Manufactured
Home Standard (H.U.D. TITLE 24, PART 280)
and the National Fuel Gas Code (ANSI-Z223.1/
NFPA-54).
• 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.
NOTE: Shut-off valve must be designed and
listed for use with liquid petroleum (L.P. gas).
The gas supply to your home will either be Natural
Gas or L.P. (bottle gas). Your furnace is factory
equipped to operate on Natural Gas. If your gas
supply is L.P. (bottle gas), you must contact a
qualified serviceman or gas supplier to convert
the furnace. Instructions for gas conversion are
listed on page 18. Factory installed orifice sizes
are listed in Table 10 (page 31).
For natural gas operation, the furnace is designed
for 7” W.C. inlet pressure. Pressure is reduced
to 3 1/2” W.C. by the pressure regulator in the
gas valve. The maximum inlet pressure for the
valve is 13” W.C.

17
Figure 27. Typical Oil Piping for Above Ground (Single-Line) Supply
If fuel pump fails to lift oil, check for air
port plug and repeat priming procedure.
leaks and tighten all fuel fittings. Re-
prime fuel pump by injecting fuel oil into
optional (top) return port. Replace return
Top of Tank
8 ft.
Shut-off
Valve
Optional
Fuel
Filter
Alternate
Fuel Line
Entry
Control
Panel
Oil
Furnace
On-Off-Fan
Switch
Floor Cavity
Oil-Gun
Burner
Floor
Flue Gas
Sampling
Hole
Drain
End of Oil Supply Line
3" to 5" Above Bottom Drain
Guide
Pipe
Gauge
Vent with cap 2" Duplex
Bushing
2" Fill
3/8" Oil Supply Line
NOTE: Additional venting may be
required if tank is filled rapidly.
4 GPH 100-150PSI 3450 RPM
3 GPH 150-200PSI 3450 RPM
VALVE ON DELAY
NO. 2 &LIGHTER FUEL
USEONLY WITH
INLET BY-PASS
Exclusivelyfo r Beckett
Madeby Suntec
INLET
NO.2 FUEL
A2EA-6520
Becket
t
Nozzle Port
3/16 Flare Fitting
Bypass Solenoid Valve
Cordset
Inlet Port
1/4 NPTF
Bleed & Gauge Port
Pressure Adjustment
Screw
Inlet Port
1/4 NPTF
Return Port - Install 1/6” Bypass Pipe
Plug for 2-pipe System Only.
(Use 5/32” Allen Wrench)
For L.P. 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.
CAUTION:
Furnace conversion must be per-
formed by a qualified technician.
Improper conversion can cause
unsafe operation, explosion, fire
and/or asphyxiation.
Oil Tank and Piping Installation
The following procedures are recommended as
good practice. However, requirements of local
codes and ordinances, H.U.D. Manufactured
Home and Safety Standards or National Fire
Protection Association must be satisfied, where
they apply, for an approved installation.
• Use a tank capacity suitable for the application
with a weatherproof, capped fill opening and
a shielded vent to let in air as fuel is used.
• The inside of the tank must be clean before
filling. All water, rust, sediment, and debris
must be flushed out.
• A fuel or tank gauge (Figure 27) is recom-
mended for easy checking of the fuel level.
Check the gauge reading with a dipstick.
• Locate the storage tank conveniently near
the home. If the fuel tank is installed above
ground, the tank may rest 3 to 4 inches off
the ground. Fuel tanks may also be buried if
properly coated to resist corrosion.The vertical
dimension from the bottom of the fuel tank to
the fuel pump must not exceed 10 feet.
• Keep the tank filled, especially in the summer
to reduce the accumulation of condensation.
One Line System
The one line system is highly recommended
where vertical lift, from bottom of tank to pump,
is less than eight feet (Figure 27). A single line
hookup has the advantage of lower cost and
quieter operation.
Two Line System
If a two pipe system is used or if oil is taken from
the bottom of the tank, a filter is recommended.
A two line system should only be used if vertical
lift exceeds 8 feet.
1. Install the oil feed line as outlined in steps 1 - 6
below.
2. Install the oil pump bypass plug in the bottom
return port.
3. Route the return line up through the furnace
base to the return port of the pump. Route the
other end of the line to the tank, using 3/8”
O.D. copper tubing or 1/4” pipe with the ends
capped.
4. Insert the return line through the second
opening in the duplex bushing. If the bottom
of the tank is lower than the pump intake, the
tube should be inserted three or four inches
from the tank bottom. If the bottom of the tank
is higher than the pump intake, the return line
should extend not more than 8”inside the tank.
Fuel line Hook-Up
1. Use a 3/8” O.D. copper tubing for the fuel line.
NOTE: Cap the end with tape to keep out dirt
while the line is being routed.
2. Install duplex bushing for two 3/8” lines in the
top fitting of the tank. See Figure 27.
3. Insert one end of the tubing through the duplex
bushing until it is three to five inches from the
bottom drain. Tighten the bushing.
4. Route the line where it will not incur any
damage.Make bends gradual and avoid kinks
which might restrict oil flow.

18
5. Open the furnace door and connect the oil line
to the intake port on the pump. Tighten other
port plugs on the pump. NOTE: Verify the oil
line is airtight! Air leaks can cause the pump
to lose prime and will create other problems
such as nozzle failure, odors, rumbling noise,
and false safety shutdown.
6. Insert the short length of the copper tube level
with the bottom of the duplex bushing. Form
the tube into an inverted “U”to serve as a vent.
Leak Check
To eliminate problems caused by air in the oil
line, all connections in the oil supply line and
all plugs, nuts, and fittings on the pump must
be airtight. NOTE: This includes the nut that
covers the pressure adjustment. It is important
that the hook-up be done carefully and with a
good flaring tool.
Prepare the burner for priming by attaching a
clear plastic hose over the bleed port fitting and
fully opening the pump bleed port.Use a suitable
container to collect purged oil.
To ensure continuous operation, use a wire to
jump terminals T-T (or F-F) on the primary control
while burner is running.
After the piping to the furnace is complete, all
connections must be tested for leakage. This
includes pipe connections at the main gas valve,
emergency shutoff valve and each joint or union.
The soap and water solution can be applied 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.
Priming furnaces equipped with Honeywell
R7184 primary control:
1. While the ignition is on, press for 1/2 second
(or less), and release the reset button. The
lockout time will be extended to 4 minutes.
2. If prime is not established within the 4 minutes,
the control will lock out.Press the reset button
to reset the control.
3. Repeat steps 1 & 2 (if needed) until the oil
pump is fully primed.
Priming furnaces equipped with the Beckett
7505 primary control:
1. After the burner starts, press and hold the
reset button until the yellow LED turns on (15
seconds). This indicates that the button has
been held long enough.
2. Release the reset button.The yellow LED will
turn off and the burner will start up again.
3. At burner start up, click the reset button while
the igniter is still on.This transitions the control
to a dedicated pump prime mode, during
which the motor, igniter and valve are powered
for 4 minutes. The yellow LED will be on.
NOTE: If prime is not established during the
four minute pump prime mode, repeat step 3
until the oil pump is fully primed.
4. When oil flow is clear and free of air bubbles,
close air-bleed valve and tighten. (Time to
bleed air out will vary depending on length of
oil line, number of bends, etc.)
Fuel Oil Type
Do not use fuel oil heavier than Grade No. 2.
Grade No. 1 may be used where the oil supply
is subject to low temperatures.
DO NOT USE GASOLINE, CRANKCASE OIL,
OR ANY OIL CONTAINING GASOLINE.
WARNING:
Failure to keep supply of oil clean
by various procedures described
above may cause failure of certain
components such as the fuel pump
gears, check valve, shaft seal, or
burner nozzle which may result in
a burner fire.
Conversion to Propane (LP) Gas
This gas fired heating appliance was shipped from
the factory for use with natural gas.However, the
appliance can be converted for use with LP gas.
Use the following procedure for gas conversion
of the burner. See Table
Atmospheric and Direct Ignition Furnaces
1. Follow the instructions “How to Shut Off Gas”
on pages 21 or 22.
2. Disconnect the gas pipe union and the electrical
wires connected to the gas valve.
3. Remove the pilot tube and thermocouple from
the gas valve (M1G).
4. Remove the gas valve assembly:
a. Remove screw(s) from gas valve bracket.
Gas valve and spud may be removed.
Orifice is located at the end of the spud
(M1G or M1M) or remove three (3) bolts
from U-shaped manifold plate and orifice
assembly (M1B).
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 10 (page 31). NOTE: It is
not necessary to convert the pilot orifice.

19
Figure 28. Honeywell Gas Valve
PRESSURE
REGULATOR
CAP
M11678
N
A
T
N
A
T
L
P
L
P
N
A
T
N
A
T
OR
OTHER SIDE
OF CAP
LP Gas
Configuration
Black Cover
Red
Natural Gas
Configuration
Figure 29. Robertshaw Gas Valve
High Altitude Conversion
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
CGA B149.1. Please consult your local code
authority.
WARNING:
The reduction of input rating nec-
essary 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.
This furnace is shipped from the factory with
orifices and gas regulator settings for natural gas
operation at sea level altitudes. At 2000 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. See Table 12 (page 32).
6. For Honeywell gas valves with the regulator
converter (Figure 28, page 19):
a. Unscrew the pressure regulator cap and
check for the letters NAT or LP.
b. Invert the cap and tighten until snug.
7. For Robertshaw gas valves with the regulator
converter (Figure 29):
a. Remove the black cover and unscrew the
converter located on top of the gas valve.
b. Invert the converter: for LP the red ring will
be located at the bottom and the LP stamping
on the converter will appear right side up.
c. Screw converter back into the regulator,
hand tight plus 1/8 turn. Replace the black
cover on the converter top to protect the
threads.
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 Lighting and Operating instructions on
page 22.
Flue Gas Sampling
It may be necessary to take flue gas sampling
from oil and gas furnaces (M5S and M1B Series
Models) 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.

20
STARTUP AND ADJUSTMENTS
PLEASE READ ALL SAFETY INFORMATION
BEFORE LIGHTING THE FURNACE
Lighting Instructions - Standing Pilot Models.
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance.
3. Remove the furnace door.
4. Push in and move the gas control lever to the
OFF positon (Figure 30). DO NOT FORCE!
5. Wait 10 minutes to clear out any gas.If you smell
gas, STOP! and read the Safety Information.
If you don’t smell gas, proceed to step 6.
6. Find pilot - follow metal pilot tube from gas
control valve. Open hinged fire observation
door. The pilot is found at the end of the pilot
tube just left of the pilot shield (Figure 31).
7. Lightly depress the gas control lever and move
it to the ON position. Release and move the
lever to the PILOT position.
8.Move the control lever to SET and hold.
Immediately light the pilot with a match.
Continue to hold the control lever for about one
(1) minute after the pilot is lit. NOTE: The pilot
flame is adjustable by turning the adjustment
screw located on the gas valve with a small
screwdriver. See Figure 29.
9. Release the lever and it will spring back to the
PILOT position. NOTE: Pilot should remain lit.
If it goes out, repeat steps 4 through 8 above.If
the lever does not spring back when released,
immediately call your service technician or gas
supplier. If the pilot will not stay lit after several
tries, move the gas control lever to OFF and
call your service technician or gas supplier.
10.Move the gas control lever to ON.
11.Turn on all electric power to the furnace.
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 lighting of the furnace after any
home setup must be performed by a
qualified service technician.
• If this appliance has a pilot that must be lit by
hand, follow these instructions exactly.
• BEFORE LIGHTING: Smell all around the
furnace for gas and next to the floor. Some
gas is heavier than air and may settle on the
floor.
• Use only your hand to push in the gas control
lever.Never use tools.If the lever will not push in
by hand, don’t try to repair it.Force or attempted
repair may result in a fire or explosion. Call a
qualified service technician.
• 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.
FIRE OR EXPLOSION HAZARD
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.
WARNING:
Figure 31. Lighting The Furnace
PILOT
BRACKET
Gas Control Lever
Figure 30. Standing Pilot Valve
Pilot Position
Set Position