Installation Instructions
14
C
U
T
H
E
R
E
Vent/Flue Pipe Cuts
Figure 10
T
HE
RUBBER
ELBOW
IS
NOT
DESIGNED
TO
SUPPORT
A
LOAD
. W
HEN
THE
RUBBER
ELBOW
IS
MOUNTED
EXTERNALLY
TO
THE
FURNACE
CABINET
,
EXTREME
CARE
MUST
BE
TAKEN
TO
ADEQUATELY
SUPPORT
FIELD
-
SUPPLIED
VENT
/
FLUE
PIPING
,
AS
DAMAGE
CAN
RESULT
IN
LEAKS
CAUSING
BODILY
INJURY
OR
DEATH
DUE
TO
EXPOSURE
TO
FLUE
GASES
,
INCLUDING
CARBON
MONOXIDE
WARNING
12345678
2 7570656055504540
3 114 107 100 93 86 79 72 65
2 7570656055504540
3 114 107 100 93 86 79 72 65
2 100 95 90 85 80 75 70 65
3 168 161 154 147 140 133 126 119
2 5045403530252015
3 143 136 129 122 115 108 101 94
2 6055504540353025
3 113 106 99 92 85 78 71 64
2 6055504540353025
3 120 113 106 99 92 85 78 71
2 4540353025201510
3 103 96 89 82 75 68 61 54
2 4540353025201510
3 151 144 137 130 123 116 109 102
*MEC961205DN
3 185 178 171 164 157 150 143 136
2 100 95 90 85 80 75 70 65
3 110 103 96 89 82 75 68 61
2 4540353025201510
3 110 103 96 89 82 75 68 61
2 353025201510 5NA
3 103 96 89 82 75 68 61 54
2 4540353025201510
3 110 103 96 89 82 75 68 61
*MEC96/*CEC96 Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
(6)
Maximum Allowable Length of Vent/Flue Pipe
MODEL
Pipe Size
(4)
(in.)
Number of Elbows
(3) (5)
*MEC960303AN
&
*MEC960403AN
*MEC960603AN
*MEC960302BN
&
*MEC960402BN
*MEC960603BN^
*MEC960803BN
*MEC960804CN
*MEC961004CN
*MEC961005CN
*CEC960403BN
*CEC960603BN
*CEC960803BN
*CEC961005CN
^ *MEC960603BN-add 45' of 2" pipe for upflow.
2.5" pipe may be used instead of 2" pipe.
For installations at or above 7,000 altitude use 3"
venting (and combustion air pipe if applicable)
NOTE: In the horizontal left installation position, a means of
condensate collection must be provided to keep vent pipe
condensate from entering the draft inducer housing. If the
vent drain elbow is eliminated from the installation, an
RF000142 kit must be used.
1. Remove the four screws from the vent pipe flange on
top the furnace.
2. Remove the internal elbow and vent pipe
3. Cut 2 1/2" from the flange .
4. Remove plastic plug in line with the inducer outlet
5. Install cut end of the flanged section and connect to
inducer with rubber coupling supplied with furnace.
6. Install screws removed in step 1 securing flange to
cabinet.
Insert flange. Cut 2 ½” long.
R 000142F
Figure 9
*MEC96/*CEC96 Direct Vent (2-Pipe) and Non-Direct Vent (1-Pipe)
1. Maximum allowable limits listed on individual lengths for inlet and
flue and NOT a combination.
2. Minimum requirement for each vent pipe if five (5) feet in length
and one elbow/tee.
3. Tee used in the vent/flue termination must be included when
determining 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 Configuration using (2) 45 deg. Long Sweep
elbows should be considered equivalent to one 90 deg. elbow.
6. One 90° elbow should be secured to the combustion air intake
connection.