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5

INTRODUCTION

Congratulations on the purchase on your new furnace! With 

our dedication to quality, superior reliability, and outstanding 

warranty, we know you will be pleased with this new appliance. 

This furnace has been designed and built to provide many years 

of safe and dependable home comfort, providing it is properly 

installed and regular maintenance has been performed. Improper 

use or insufficient maintenance can shorten the life of the furnace 

and result in serious personal injury or property damage. Please 

read this manual thoroughly and familiarize yourself with the 

safety, operation and maintenance procedures for this furnace. 

DO NOT DESTROY THIS MANUAL. KEEP IN A SAFE PLACE 

FOR FUTURE REFERENCE.
Your furnace is designed to fulfill the requirements of being 

classified as a Category IV furnace. This classification is related to 

the furnace’s Annual Fuel Utilization Efficiency (AFUE) rating, the 

percentage of fuel that is converted into usable heating energy.
The furnace components shown on page 6 will help to identify 

and locate various parts of the furnace. The component you need 

to familiarize yourself with is the gas valve. You will use this to 

turn the furnace on and off. 

There are no user serviceable 

parts. All repairs must be performed by a licensed HVAC 

technician.

Category IV (Condensing) Furnaces

Category IV furnaces typically have an AFUE rating over 90% 

and are mainly vented through plastic PVC pipe. These furnaces 

also produce liquid condensate which is slightly acidic. The vent 

pipe must be sloped upwards away from the furnace to properly 

drain the condensate  back to the condensate disposal system.
•  Condensing type furnaces require condensate drain lines 

to be properly installed by the installer. Depending on your 
configuration, the drain lines may be routed out the left or 
right sides of the furnace. These drain lines must maintain a 
downward slope to ensure proper condensate drainage.

•  Condensate must flow freely during furnace operation. The 

homeowner must make sure the condensate drain lines do 
not become blocked, pinched or crushed.

•  If the furnace is installed in an area where temperatures 

fall below freezing, special precautions must be made for 
insulating condensate drain lines that drain to the outdoors.

 

If condensate freezes in the lines, this will cause the 
condensate drain switch to shut down the furnace. Only 

a licensed HVAC technician can reset this switch.

FILTER

 WARNING:

Never operate the furnace without a filter in place. 

Accumulating dust in the return air can build up on 

internal components, resulting in loss of efficiency, 

equipment damage, and possible fire.

• 

Air filter(s) are not supplied with the furnace as shipped 

from the factory. The installer must provide a high velocity 

filter and rack for a filter in the return air duct adjacent to the 

furnace, or in a return air grill to the furnace.

•  The furnace should always have a clean filter located either 

at the air return on the furnace or in an air return register. If 

the filter becomes dirty, it should be cleaned or replaced.

•  New or newly renovated homes may require more frequent 

changing until the construction dust has minimized. Filters 

designed to remove smaller particles such as pollen, may 

require additional maintenance. 

•  Always reinstall the doors on the furnace after servicing or 

cleaning/changing the filters. 

Do not operate the furnace 

without all doors and covers in place.

FURNACE LOCATION

If a furnace is installed in relatively small utility room or closet, the 

installation needs openings in the walls or door to let combustion 

air in. Make sure that these openings remain unobstructed. 

Do not modify these openings in any way without consulting a 

licensed HVAC technician.

If the furnace fails to operate check the following:

1.  Is the thermostat setting correct?

2.  Are the blower compartment door(s) in place?

3.  Has the circuit breaker tripped or the control board fuse 

burned open?

4.  Is the gas turned on at the manual shutoff?

5.  Is the filter dirty or clogged?

If the furnace still doesn’t operate, contact a licensed HVAC 

technician

ABOUT THE FURNACE

TROUBLESHOOTING

Summary of Contents for MG3P

Page 1: ...IMPORTANT Please read all information in this manual thoroughly and become familiar with the capabilities and use of your appliance before attempting to operate or maintain this unit Pay attention to...

Page 2: ...OD DAMAGE 4 ABOUT THE FURNACE 5 INTRODUCTION 5 CATEGORY IV CONDENSING FURNACES 5 FILTER 5 FURNACE LOCATION 5 TROUBLESHOOTING 5 COMPONENT LOCATIONS 6 STARTUP SHUTDOWN 7 STARTING THE FURNACE 7 SHUTTING...

Page 3: ...ou les sorties de l vent de l appareil de chauffage et la prise d air ne soient enaucunefa on obstru es quellequesoitlasaison Safety markings are used frequently throughout this manual to designate a...

Page 4: ...Never operate the furnace without a filter in place Accumulating dust in the return air can build up on internal components resulting in loss of efficiency equipment damage and possible fire Keep air...

Page 5: ...ace operation The homeowner must make sure the condensate drain lines do not become blocked pinched or crushed If the furnace is installed in an area where temperatures fall below freezing special pre...

Page 6: ...e B C D cabinets only Roll Out Switch Transformer Vent Limit Switch Burner Assembly Flame Sensor Roll Out Switch Finish Flange Blower Assembly behind blower panel Blower Door Switch behind blower pane...

Page 7: ...F YOU NEED TO SHUT DOWN YOUR FURNACE FOR SERVICE OR MAINTENANCE SHUT OFF THE GAS VALVE TO THE FURNACE BEFORE TURNING OFF THE ELECTRICAL SERVICE If your installation has a manual gas shutoff valve on t...

Page 8: ...the furnace The furnace venting system should be inspected annually by a licensed HVAC technician Vent pipe must slope upwards and be physically secured without holes or corrosion Any corroded sectio...

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