Installations Instructions

21
ALTERNATE COMBUSTION AIR PROVISION
(Upf low / Horizont al model s only)
When using the alternate venting location, either in a
horizontal left side down installation or a vertical instal-
lation using down – venting, an alternate combustion air
opening can used. A locating dimple is located on the
right side of the furnace cabinet. The locating dimple is 1
7/8" measured from the front edge of the cabinet in line
with the knock out. To use the alternate combustion air
location:
1. Remove screws and combustion air flange from
cabinet.
2. Insert cabinet plug in unused combustion air hole.
3. Drill a pilot hole at the cabinet dimple (size dictated
by knockout tool used).
4. Use a knockout tool to create a 3" diameter hole
5. Install combustion air flange and secure with screws
removed in step one.
VENT/ FLUE PIPE LENGTHS AND DIAMETERS
For installations at or above 7,000 feet altitude, use 3” vent-
ing. Refer to the following table for applicable length, elbows,
and pipe diameter for construction of the vent/flue pipe system.
The tee used in the vent/flue termination must be counted as
an elbow when determining the number of elbows in the piping
system.
12345678
2 or 2 1/2
115 110 105 100 95 90 85 80
3
137 130 123 116 109 102 95 88
2 or 2 1/2
115 110 105 100 95 90 85 80
3
147 140 133 126 119 112 105 98
2 or 2 1/2
60 55 50 45 40 35 30 25
3
1201131069992857871
2 or 2 1/2
40 35 30 25 20 15 10 5
3
144 137 130 123 116 109 102 95
2 or 2 1/2
40 35 30 25 20 15 10 5
3
144 137 130 123 116 109 102 95
2 or 2 1/2
95 90 85 80 75 70 65 60
3
144 137 130 123 116 109 102 95
2 or 2 1/2
95 90 85 80 75 70 65 60
3
144 137 130 123 116 109 102 95
2 or 2 1/2
60 55 50 45 40 35 30 25
3
1201131069992857871
2 or 2 1/2
40 35 30 25 20 15 10 5
3
10396898275686154
*MVM970803BNA*
*MVM970804CNA*
*MVM971005CNA*
*CVM971005CNA*
*MVM971205DNA*
*CVM970603BNA*
*CVM970803BNA*
*CVM970804CNA*
Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
(6)
Pipe
Size
Model
Numbe r of Elbows
*MVM970603BNA*
1) Maximum allowable limits listed on individual lengths for inlet and flue
and NOT a combination.
2) Minimum requirement for each vent pipe is five (5) feet in length and
one elbow/tee.
3) Tee used in the vent/flue termination must be included when determin-
ing the number of elbows in the piping system.
4) 2 1/2” or 3” diameter pipe can be used in place of 2” diameter pipe.
5) Increased Clearance Configurations using (2) 45 deg. elbows should
be considered equivalent to one 90 deg. elbow.
6) One 90° elbow should be secured to the combustion air intake connec-
tion.
7) For installations at or above 7,000 feet altitude, use 3” venting.
VENT/ FLUE PIPE TERMINATIONS
NOTE: If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
The vent/flue pipe may terminate vertically, as through a
roof, or horizontally, as through an outside wall.
Vertical vent/flue pipe terminations should be as shown in
the following figure. Refer to Vent / Fl ue Pipe and Combust ion
Air Pipe - Ter minat ion Locat i ons for details concerning loca-
tion restrictions. The penetration of the vent through the
roof must be sealed tight with proper flashing such as is used
with a plastic plumbing vent.
Horizontal vent/flue pipe terminations should be as shown in the
following figure. Refer to Vent / Fl ue Pi pe and Combust ion Air
Pipe - Ter minat i on Locat ions for details concerning location re-
strictions. The wall penetration should be sealed with sili-
cone caulking material.
NOTE: Terminat e bot h pipes in t he same pressure zone
(same side of roof, no maj or obst acles between pipes,
et c.).
COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
single pipe installation
TEE (OPTIONAL)
9
6
”
M
A
X
.
-
3
”
M
I
N
.
R
O
O
F
L
I
N
E
12” MIN
HEIGHT DIFFERENCE
BETWEEN
INTAKE AND VENT
12” MIN TO ROOF OR HIGHEST
ANTICIPATED SNOW LEVEL
Figure 13
STRAIGHT
ELBOWS
Figure 14