Lennox G51MP?48C?090 User Manual

Page 24
FIGURE 20
TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION
IN UPFLOW OR DOWNFLOW DIRECT OR NON−DIRECT VENT APPLICATIONS
(Right−Hand Exit in Upflow Application Shown)
CONDENSATE
TRAP
(Must be installed
on same side as
exhaust piping)
VENT PLUG
(Must be
glued in
place)
PLUG
PLUG PLUG
*2" diameter street elbow provided.
**3" diameter reducing elbow provided.
G51MP−135 with
3" OR 4" vent pipe
3"**
2"
G51MP−045, 070
or 090 with
2−1/2", 3", or 4"
vent pipe
3"
REDUCER
(use only if
4" pipe is
required)
4"
***Limit pipe length to 2".
2”
2”
2−1/2",
3", OR
4"
TRANSITION
2”
2”
2”
G51MP−110−1, −2 units with
2−1/2", 3", OR 4" vent pipe
2"*
2"***
2−1/2",
3", OR
4"
G51MP−110 with
2” vent pipe
2”*
TRANSITION
G51MP−24B−045
G51MP−36B−045
G51MP−36B−070
G51MP−48C−090
G51MP−60C−090
G51MP−24B−045
G51MP−36B−045
G51MP−36B−070
G51MP−36C−090
G51MP−60C−090
G51MP−48C−110*
G51MP−60C−110*
G51MP−60D−135*
FIGURE 21
TYPICAL EXHAUST PIPE CONNECTIONS
HORIZONTAL DIRECT OR
NON−DIRECT VENT APPLICATIONS
(Horizontal Right−Hand Air Discharge Application Shown)
2"
2"
2"
2"*
2−1/2",
3", OR
4"
*Limit pipe length to 2"
in G51MP−110 and −135
applications.
DO NOT transition from
smaller to larger pipe
size in horizontal runs.
G51MP−48C−090
G51MP−36C−090
TRANSITION
G51MP−48C−110
G51MP−60C−110
IMPORTANT
Exhaust piping and condensate trap must be
installed on the same side of the unit for upflow
and downflow positions.
2. All horizontal runs of exhaust pipe must slope back to-
ward unit. A minimum of 1/4" (6mm) drop for each 12"
(305mm) of horizontal run is mandatory for drainage.
Horizontal runs of exhaust piping must be supported ev-
ery 5 feet (1.52m) using hangers.
NOTE − Exhaust piping should be checked carefully to
make sure there are no sags or low spots.
3. On the opposite side of the cabinet, glue the provided
2" vent plug into the unused flue collar.
4. Route piping to outside of structure. Continue with
installation following instructions given in piping ter-
mination section.
CAUTION
Do not discharge exhaust into an existing stack or
stack that also serves another gas appliance. If verti-
cal discharge through an existing unused stack is re-
quired, insert PVC pipe inside the stack until the end
is even with the top or outlet end of the metal stack.
CAUTION
The exhaust vent pipe operates under positive pres-
sure and must be completely sealed to prevent leak-
age of combustion products into the living space.
Intake Piping

Lennox G51MP?48C?090 Specifications

General

Brand	Lennox
Model	G51MP?48C?090
Category	Furnace
Language	English