Gas Heater User Manual

Page 21
Venting Practices
The thickness of construction through which vent pipes
may be installed is 24" (610mm) maximum and 3" (76mm)
minimum. If a G61MP furnace replaces a furnace which
was commonly vented with another gas appliance, the size
of the existing vent pipe for that gas appliance must be
checked. Without the heat of the original furnace flue prod-
ucts, the existing vent pipe is probably oversized for the
single water heater or other appliance. The vent should be
checked for proper draw with the remaining appliance.
1 − Use recommended piping materials for exhaust pip-
ing.
2 − Secure all joints so that they are gas-tight using ap-
proved cement.
Suspend piping using hangers at a minimum of every 5
feet (1.52m) for schedule
40 PVC and every 3 feet
(.91m) for ABS−DWV, PVC−
DWV, SPR−21 PVC, and
SDR−26 PVC piping. A suit-
able hanger can be fabri-
cated by using metal or
plastic strapping or a large
wire tie.
3 − In areas where piping penetrates joists or interior
walls, hole must be large enough to allow clearance on
all sides of pipe through center of hole using a hanger.
4 − Isolate piping at the point where it exits the outside wall
or roof in order to prevent transmission of vibration to
the structure.
5 − When furnace is installed in a residence where unit is
shut down for an extended period of time, such as a
vacation home, make provisions for draining conden-
sate collection trap and lines.
Exhaust Piping
NOTE − A 2" diameter PVC street ell is located on the
blower deck of 48C−110, 60C−110 and 60C−111 units. In
upflow or downflow applications the street ell must be
glued using transition solvent cement directly into the
unit flue collar. See figure 23. A 3" to 2" PVC reducing ell is
located on the blower deck of the 60D−135 units. In up-
flow or downflow applications, the reducing ell must
be glued using transition solvent cement directly into the
unit flue collar.
1 − Choose the appropriate side for venting in upflow or
downflow positions. Exhaust piping exits from the top
of the unit in horizontal air discharge applications.
Glue the field−provided exhaust vent pipe (or provided
street ell or reducing ell in upflow or downflow applica-
tions) to the flue collar. All PVC cement joints should
be made according to the specifications outlined in
ASTM D 2855. Refer to pipe and fittings specifications
and gluing procedures.
VENT PLUG
(Must be
glued in
place)
PLUG
PLUG
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)
FIGURE 23
CONDENSATE
TRAP
(Must be installed
on same side as
exhaust piping)
PLUG
G61MP−135, −110, −111
with
3" OR 4" vent pipe
2"
G61MP−045,
−070, −071 or
−090, −091 with
2−1/2", 3", or 4"
vent pipe
2" max
length
TRANSITION
(use only if 4"
pipe is
required)
4"
2"
2−1/2",
3", OR
4"
TRANSITION
2"
2"
G61MP−110, −111 with
2−1/2", 3", OR 4" vent
pipe
*2"
TRANSITION
2−1/2",
3", OR
4"
2"
**2"
or
45°
MAX
45°
MAX
SIDE VIEW
*2" diameter street elbow provided.
3" to 2" REDUCING ELBOW
(provided)
**Street elbow may be used on −045, −070, 071, −090 and −091.
2" max
length
FIGURE 22
STRAPPING
(metal, plastic
or large wire
ties)