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WELCOME TO A NEW
GENERATION OF
COMFORT
Congratulations! In light of rising
energy costs, the Plus 90
TM
, 340MAV,
Plus90t™ and Plus 90i
TM
Multipoise,
Gas-Fired, Condensing Furnaces are
among the soundest investments
today’s homeowner can make.
Your new furnace is truly a triumph
of technology in home heating. A
revolutionary design employs 2 heat
exchangers to “squeeze” out the maxi-
mum amount of heat from the fuel con-
sumed. In fact, your new furnace is so
efficient, over 90%* of the heat gener-
ated during combustion is captured and
delivered inside your home. That is
more than a 33%* increase in heating
efficiency over conventional furnaces.
These are among the most energy-effi-
cient furnaces you can buy today. They
also are among the safest and most
dependable. We are proud of the tech-
nological advances incorporated into
the design of these furnaces. With only
minimal care, your new furnace will
deliver many years of money-saving
home comfort and enjoyment. Spend
just a few minutes with this manual to
learn the operation of your new fur-
nace and the small amount of mainte-
nance it takes to help keep it operating
at peak efficiency year after year.
* The output capacity and any representations of efficiency
for this furnace are based on standard U.S. Department of
Energy test procedures.
1
MODELS 340MAV
(SHOWN) AND 350MAV
FIXED-CAPACITY
FURNACES
2
MODEL 355MAV
VARIABLE-CAPACITY
AND MODEL 352MAV
TWO-STAGE
FURNACES
CERTIFIED
As an ENERGY STAR®
Partner, Bryant Heating &
Cooling Systems has
determined that this product
meets the ENERGY STAR®
guidelines for energy
efficiency.
2
TABLE OF CONTENTS
WELCOME TO A NEW GENERATION OF COMFORT
. . . . . . . . .2
GENERAL FURNACE SAFETY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
FURNACE COMPONENTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
BEFORE STARTING YOUR FURNACE
. . . . . . . . . . . . . . . . . . . . . . . .4
STARTING AND SHUTTING DOWN YOUR FURNACE
. . . . . . . . .4
Steps for Starting Your Furnace . . . . . . . . . . . . . . . . . . . . . . . . . .4,5
Shutting Down Your Furnace. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PERFORMING ROUTINE MAINTENANCE
. . . . . . . . . . . . . . . . . . . . 6
Filtering Out Trouble. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
COMBUSTION AREA AND VENT SYSTEM
. . . . . . . . . . . . . . . 8
Heading South For the Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
A CHECK-UP CHECKLIST
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9,10
BEFORE YOU REQUEST A SERVICE CALL
. . . . . . . . . . . . . . . . . .10
INSTALLATION DATA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
GENERAL FURNACE SAFETY
1. Combustible Materials, Gasoline Warning
. . . . . . . . . . . . . . . . . 1,4
2. Furnace Must be Kept Free and Clear of Insulating
Material Warning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3. Furnace Needs Air for Combustion and Ventilation Warning
. . .4
4. Starting (Lighting) and Shutting Down the Furnace Warning
. . .7
5. Proper Furnace Shutdown Procedures
. . . . . . . . . . . . . . . . . . . . . . .5
6. Flood Damage Warning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
7. Fire or Explosion Hazard Warning
. . . . . . . . . . . . . . . . . . . . . . . . . . 1
8. Carbon Monoxide Warning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
9. Service and Maintenance Electrical Hazard Warning
. . . . . . . . . 6
10. Improper Vent Warning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
11. Sharp Edges Caution
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
12. No Filter Caution
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
13. Filter Rod Modification Caution
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
14. Dirt, Rust, or Accumulation Caution
. . . . . . . . . . . . . . . . . . . . . . . . 7