10
Category I Venting (Vertical Venting)
T
O
PREVENT
POSSIBLE
PERSONAL
INJURY
OR
DEATH
DUE
TO
ASPHYXIATION
,
THIS
FURNACE
MUST
BE
C
ATEGORY
I
VENTED
. D
O
NOT
VENT
USING
C
ATEGORY
III
VENTING
.
WARNING
Category I Venting is venting at a non-positive pressure. A
furnace vented as Category I is considered a fan-assisted
appliance and the vent system does not have to be “gas tight.”
NOTE:
Single stage gas furnaces with induced draft blow-
ers draw products of combustion through a heat exchanger
allowing, in some instances, common venting with natural
draft appliances (i.e. water heaters). All installations must be
vented in accordance with National Fuel Gas Code NFPA 54/
ANSI Z223.1 - latest edition. In Canada, the furnaces must be
vented in accordance with the National Standard of Canada,
CAN/CSA B149.1 and CAN/CSA B149.2 - latest editions and
amendments.
NOTE:
Masonry vent kit (MVK-01 and MVK-02) is to only
be used on interior masonry chimneys or qualifying exterior
masonry chimney applications identified in the MVK kit
installation instructions. To ensure safe and reliable operation,
use only the kit listed for your model.
Kit
Input KBTU Range
Limit Setting
MVK-01
40-100
250°F
MVK-02
120-140
290°F
Note:
This kit is for use on Daikin brand 80% AFUE, 33” tall
DM80SE model furnaces installed in the upflow position only.
NOTE:
The vertical height of the Category I venting system
must be at least as great as the horizontal length of the venting
system.
T
O
PREVENT
POSSIBLE
PERSONAL
INJURY
OR
DEATH
DUE
TO
ASPHYXIATION
,
COMMON
VENTING
WITH
OTHER
MANUFACTURER
’
S
INDUCED
DRAFT
APPLIANCES
IS
NOT
ALLOWED
.
WARNING
The minimum vent diameter for the Category I venting system
is as shown:
UPFLOW
COUNTERFLOW
40
4 Inch
4 Inch
60
4 Inch
4 Inch
80
4 Inch
4 Inch
100
5 Inch
5 Inch
120
5 Inch
N/A
140
5 Inch
N/A
MODEL
MINIMUM VENT
Under some conditions, larger vents than those shown above
may be required or allowed.
When an existing furnace is re
-
moved from a venting system serving other appliances
, the
venting system may be too large to properly vent the remaining
attached appliances.
Upflow or Horizontal units
are shipped with the induced draft
blower discharging from the top of the furnace. (“Top” is as
viewed for an upflow installation.) The induced draft blower
can be rotated 90 degrees with the (0270F01119) chimney
transition bottom kit for Category I venting. For upflow mod
-
els installed vertically or horizontally, a four inch single wall
pipe can be used to extend the induced draft blower outlet
1/2” beyond the furnace cabinet.
THIS PRODUCT IS NOT
DESIGNED FOR COUNTERCLOCKWISE INDUCED DRAFT
BLOWER ROTATION.
Vent the furnace in accordance with the National Fuel Gas
Code NFPA 54/ANSI Z223.1 - latest edition.
Venting - Furnace Installed in Horizontal Position
THIS FURNACE IS NOT DESIGN CERTIFIED TO BE HORI-
ZONTALLY VENTED THROUGH AN EXTERIOR SIDE WALL.
The following describes an optional venting procedure when
the furnace is installed in the horizontal left discharge position.
To rotate the induced draft blower clockwise, you will need
to purchase one (0270F01119) chimney transition bottom kit.
1. Disconnect electrical power from the furnace.
2. Disconnect the induced draft blower power leads, flue
pipe, and pressure switch tubing.
3. Remove the round cutout from the right side of the
wrapper.
4. Remove and save the four screws that fasten the
induced draft blower to the flue collector box.
5. Remove and save the three screws that hold the
chimney assembly to the induced draft blower.
6. Remove and save the four screws that fasten the
chimney top to the chimney bottom.
7. Remove the chimney transition bottom from the
transition bottom kit.
8. Install the chimney top with the four screws retained
from step 6 onto the new chimney transition bottom
from the transition bottom kit.
9. Remove the induced draft blower and install the new
chimney assembly to it using the three screws retained
from step 5.
10. Rotate the induced draft blower 90 degrees to the right,
feed the flue pipe through the round cutout from the
outside of the wrapper, and fit onto the chimney top
assembly. Secure the pipe to the chimney top from the
front, top, and bottom using (3) screws and rotating the
induced draft blower to properly orient the assembly.
NOTE: If the pipe section is less than 18”, then attach it
directly to the chimney top on 3 sides and feed it through
the round cutout from the inside of the wrapper.
11. Reattach the induced draft blower using the (4) screws
retained from step 3. Ensure the gasket located
between the induced draft blower and collector box is
rotated accordingly.
12. Reconnect the induced draft blower power leads.
13. Reconnect the remaining flue pipe, and the pressure
switch tubing. Ensure that all wires and the pressure
switch tubing is at least one inch from the flue pipe, or
any other hot surface.
