Miller M5SB Installation Instruction
Miller M5SB is a direct vent (sealed combustion), downflow oil furnace designed for manufactured and recreational homes. It's compatible with R410A and A2L refrigerants, allowing for optional air conditioning integration. The M5SB offers a range of features for efficient heating, including a multi-speed blower assembly and adjustable temperature rise settings. It is also equipped with safety features like a carbon monoxide detector and a built-in A2L sensor for safe operation.
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M5SB Oil Furnace - R410A and A2L Compatible
Downflow, Direct Vent (Sealed Combustion) Forced Air Oil Furnaces
For installation in:
• Manufactured Homes
• Recreational Vehicles, Park Models, & Manufactured Buildings
• Modular Homes / Buildings
INSTALLATION INSTRUCTIONS
WARNING CAUTION
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.
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.
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 the
manufacturer 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 factory authorized servicers is
located in the furnace homeowner packet.
Reference: HUD Manufactured Home
Construction and Safety Standards 3280.714.
DO NOT DESTROY. PLEASE READ CAREFULLY & KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
Downflow, Direct Vent (Sealed Combustion) Forced Air Oil Furnaces
For installation in:
• Manufactured Homes
• Recreational Vehicles, Park Models, & Manufactured Buildings
• Modular Homes / Buildings
INSTALLATION INSTRUCTIONS
WARNING CAUTION
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.
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.
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 the
manufacturer 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 factory authorized servicers is
located in the furnace homeowner packet.
Reference: HUD Manufactured Home
Construction and Safety Standards 3280.714.
DO NOT DESTROY. PLEASE READ CAREFULLY & KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
2
TABLE OF CONTENTS
IMPORTANT SAFETY INFORMATION..................... 3
REQUIREMENTS & CODES ..................................... 3
GENERAL INFORMATION........................................ 4
Minimum Clearances ............................................... 4
Applications ............................................................. 4
Unit Location ............................................................ 6
A2L Coil ................................................................... 6
C85 Loose Coils .................................................... 6
Coils from other Manufacturers ............................. 6
CIRCULATING AIR REQUIREMENTS...................... 6
Return Air ................................................................. 6
Supply Air ................................................................ 7
FURNACE INSTALLATION....................................... 7
General Information ................................................. 7
Locating & Cutting Duct Openings ........................... 7
Standard Duct Connector Installation ...................... 8
Alternate Attachment Method ................................ 8
Round Duct Connector Installation .......................... 8
Installing the Furnace .............................................. 8
ROOF JACK INSTALLATION ................................... 10
Roof Jack Selection ................................................. 10
Locating & Cutting Roof / Ceiling Openings ............ 10
Installing The Roof Jack .......................................... 10
ELECTRICAL INFORMATION .................................. 13
Line Voltage Wiring .................................................. 13
Connecting Power Supply Wires ........................... 13
Low Voltage Wiring .................................................. 13
Connecting Thermostat Wires ............................... 13
Verifying Anticipator Setting .................................. 14
Grounding ................................................................ 14
FUEL SUPPLY & PIPING .......................................... 15
Flue Gas Sampling .................................................. 15
Oil Tank & Piping Installation ................................... 15
One-Line System .................................................. 15
Two-Line System................................................... 15
Fuel line Hook-Up .................................................... 15
Fuel Line Bleeding ................................................... 16
Priming the furnace .................................................. 16
Fuel Oil Type ........................................................... 16
STARTUP & ADJUSTMENTS ................................... 16
Operating Instructions .............................................. 16
How to Shut Off Oil Gun Models ........................... 16
Verifying & Adjusting Temperature Rise .................. 16
Burner Adjustments ................................................. 17
Combustion Air ........................................................ 17
Electrode Setting ..................................................... 17
Switching Ignition Control between Interrupted
and Intermittent Duty ............................................... 17
OPERATING SEQUENCE ......................................... 18
TROUBLESHOOTING ............................................... 18
FURNACE CONTROLS & FUNCTIONS ................... 19
MAINTENANCE ......................................................... 19
Installer Information ................................................. 19
Additional Oil Furnace Maintenance ........................ 19
OPTIONAL ACCESSORIES ...................................... 20
Optional Add-On Air Conditioning ............................ 20
FIGURES & TABLES................................................. 21
Table 10. M5 Furnace Specifications and
Factory Settings .................................... 21
Table 11. A/C Blower Speed Selection Chart ....... 21
Figure 32. M5S Wiring Diagram (A/C Ready) ....... 22
INSTALLATION CHECKLIST.................................... 24
MODEL IDENTIFICATION
Door Color
W - White
Application
M-Manufactured Home
Furnace Series
Fuel, Type of Combustion
S-Oil, Direct Vent, Gun Burner
Comfort Model
B - A/C Ready, 3 Ton
C - A/C Ready, 4 Ton
R410A and A2L (R454B)
indoor coil compatible
M 5 S B - B 066 A - B W 1
Cabinet Dimensions
A - 56" x 19-3/4" x 23-3/4”
B - w/Coil Cavity, 76" x 19-3/4" x 23-3/4"
Electrical Code
A - 1PH, 60 Hz, 115 VAC
Heating Capacity
Input MBH
Revision
TABLE OF CONTENTS
IMPORTANT SAFETY INFORMATION..................... 3
REQUIREMENTS & CODES ..................................... 3
GENERAL INFORMATION........................................ 4
Minimum Clearances ............................................... 4
Applications ............................................................. 4
Unit Location ............................................................ 6
A2L Coil ................................................................... 6
C85 Loose Coils .................................................... 6
Coils from other Manufacturers ............................. 6
CIRCULATING AIR REQUIREMENTS...................... 6
Return Air ................................................................. 6
Supply Air ................................................................ 7
FURNACE INSTALLATION....................................... 7
General Information ................................................. 7
Locating & Cutting Duct Openings ........................... 7
Standard Duct Connector Installation ...................... 8
Alternate Attachment Method ................................ 8
Round Duct Connector Installation .......................... 8
Installing the Furnace .............................................. 8
ROOF JACK INSTALLATION ................................... 10
Roof Jack Selection ................................................. 10
Locating & Cutting Roof / Ceiling Openings ............ 10
Installing The Roof Jack .......................................... 10
ELECTRICAL INFORMATION .................................. 13
Line Voltage Wiring .................................................. 13
Connecting Power Supply Wires ........................... 13
Low Voltage Wiring .................................................. 13
Connecting Thermostat Wires ............................... 13
Verifying Anticipator Setting .................................. 14
Grounding ................................................................ 14
FUEL SUPPLY & PIPING .......................................... 15
Flue Gas Sampling .................................................. 15
Oil Tank & Piping Installation ................................... 15
One-Line System .................................................. 15
Two-Line System................................................... 15
Fuel line Hook-Up .................................................... 15
Fuel Line Bleeding ................................................... 16
Priming the furnace .................................................. 16
Fuel Oil Type ........................................................... 16
STARTUP & ADJUSTMENTS ................................... 16
Operating Instructions .............................................. 16
How to Shut Off Oil Gun Models ........................... 16
Verifying & Adjusting Temperature Rise .................. 16
Burner Adjustments ................................................. 17
Combustion Air ........................................................ 17
Electrode Setting ..................................................... 17
Switching Ignition Control between Interrupted
and Intermittent Duty ............................................... 17
OPERATING SEQUENCE ......................................... 18
TROUBLESHOOTING ............................................... 18
FURNACE CONTROLS & FUNCTIONS ................... 19
MAINTENANCE ......................................................... 19
Installer Information ................................................. 19
Additional Oil Furnace Maintenance ........................ 19
OPTIONAL ACCESSORIES ...................................... 20
Optional Add-On Air Conditioning ............................ 20
FIGURES & TABLES................................................. 21
Table 10. M5 Furnace Specifications and
Factory Settings .................................... 21
Table 11. A/C Blower Speed Selection Chart ....... 21
Figure 32. M5S Wiring Diagram (A/C Ready) ....... 22
INSTALLATION CHECKLIST.................................... 24
MODEL IDENTIFICATION
Door Color
W - White
Application
M-Manufactured Home
Furnace Series
Fuel, Type of Combustion
S-Oil, Direct Vent, Gun Burner
Comfort Model
B - A/C Ready, 3 Ton
C - A/C Ready, 4 Ton
R410A and A2L (R454B)
indoor coil compatible
M 5 S B - B 066 A - B W 1
Cabinet Dimensions
A - 56" x 19-3/4" x 23-3/4”
B - w/Coil Cavity, 76" x 19-3/4" x 23-3/4"
Electrical Code
A - 1PH, 60 Hz, 115 VAC
Heating Capacity
Input MBH
Revision
3
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.
WARNING:
Do not install this furnace if any part has been
submerged under water. A flood damaged furnace
is extremely dangerous. Attempts to use the
furnace may result in fire or explosion. A qualified
service agency should be contacted to inspect the
furnace and to replace any electrical or control
system parts that have been wet or under water.
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.
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 5).
• Provide adequate combustion and ventilation air to the
furnace space as specified on page 6 and page 17.
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.
• This furnace is designed to operate with a maximum
external pressure rise of 0.5 inches of water column.
NOTE 1: The static pressure measurement should not
include the coil (if applicable). Consult Table 10, (page
21) and 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
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)
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.
WARNING:
Do not install this furnace if any part has been
submerged under water. A flood damaged furnace
is extremely dangerous. Attempts to use the
furnace may result in fire or explosion. A qualified
service agency should be contacted to inspect the
furnace and to replace any electrical or control
system parts that have been wet or under water.
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.
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 5).
• Provide adequate combustion and ventilation air to the
furnace space as specified on page 6 and page 17.
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.
• This furnace is designed to operate with a maximum
external pressure rise of 0.5 inches of water column.
NOTE 1: The static pressure measurement should not
include the coil (if applicable). Consult Table 10, (page
21) and 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
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)
4
• 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”.
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.
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 5).
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 (page 5).
• 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 5).
• 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 ready M5 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 6).
• 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.
Applications
M5 Series oil furnaces are listed as direct vent
(sealed combustion), downflow heating appliances for
manufactured (mobile) homes and recreational vehicles.
The furnace must be located so that venting can be
properly achieved.
Air conditioning may be added to structures with M5 series
furnaces using air conditioning or conventional units.
This instruction manual includes special requirements
for incorporation of air conditioning equipment to the M5
series furnaces. See Table 11, (page 21).
Multi-speed blower assemblies shown in Table 2, (page
5), have been certified for field installation in M5
series furnaces.
• 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”.
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.
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 5).
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 (page 5).
• 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 5).
• 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 ready M5 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 6).
• 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.
Applications
M5 Series oil furnaces are listed as direct vent
(sealed combustion), downflow heating appliances for
manufactured (mobile) homes and recreational vehicles.
The furnace must be located so that venting can be
properly achieved.
Air conditioning may be added to structures with M5 series
furnaces using air conditioning or conventional units.
This instruction manual includes special requirements
for incorporation of air conditioning equipment to the M5
series furnaces. See Table 11, (page 21).
Multi-speed blower assemblies shown in Table 2, (page
5), have been certified for field installation in M5
series furnaces.
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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Key Features
- Direct vent (sealed combustion)
- Downflow design
- Oil furnace
- R410A & A2L compatible
- Optional A/C integration
- Multi-speed blower
- Adjustable temperature rise
- CO detector
- A2L sensor
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Frequently Answers and Questions
What types of homes is the M5SB furnace suitable for?
The M5SB is designed for manufactured homes, recreational vehicles, park models, and manufactured buildings. It can also be used in modular homes and buildings.
How does the M5SB ensure safe operation with A2L refrigerants?
The M5SB is equipped with an A2L sensor on the coil, helping to mitigate refrigerant leaks and ensuring safe operation.
Can I add air conditioning to a system with the M5SB furnace?
Yes, the M5SB is A/C ready and can be integrated with air conditioning systems. Refer to the manual for specific instructions and compatible models.
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