LAARS POWER VENTED GAS WATER HEATER - Installation Manual - Manual (Page 17)

17
Part II - Venting Specifications for:
40 Gallon (151.4 L)
50 Gallon (189.2 L)
60 Gallon (227.1 L)
This water heater is a power vented appliance and is designed to vent its
products of combustion through 2” (5.1 cm) or 3” (7.6 cm) diameter Schedule
40 (solid or cellular core) vent pipe to the outdoors. The water heater may be
either vented horizontally through the wall or vertically through the roof. Use a
3” (7.6 cm) to 2” (5.1 cm) reducer to connect to the vent outlet when using 3”
(7.6 cm) vent pipe. Apply proper cement at joint locations. Table 5 lists the
maximum vent lengths for this water heater using 2” (5.1 cm) vent pipe. If
possible, locate the water heater so that the venting length and number of
elbows are kept to the minimum distance necessary to reach the outside. If the
installation requires venting lengths that exceed the lengths listed for 2” (5.1
cm) vent pipe in Table 5 then use 3” (7.6 cm) vent pipe for the vent connector.
Table 6 lists the venting distances allowed with 3” (7.6 cm) diameter vent pipe.
When venting with 3” (7.6 cm) vent pipe, use a 3” (7.6 cm) to 2” (5.1 cm)
reducer to exit through the building wall with 2” (5.1 cm) vent pipe. Use the 2”
(5.1 cm) vent terminal supplied with the water heater to terminate on the
outside of the building. If the length of the 2” (5.1 cm) needed to go through the
wall is greater than 14” (35.6 cm), use 3” (7.6 cm) vent pipe to go through the
wall and reduce to 2” (5.1 cm) vent pipe immediately after exiting the outside
wall. Refer to the venting illustrations on the following pages. Make sure the
vent pipe terminal is at least 1” (2.5 cm) away from the edge of the wall.
TABLE 5
VENT CONNECTOR LENGTHS FOR 2” (5.1cm) DIAMETER VENT PIPE
Terminating # of 90
° Elbows
(excluding vent
terminal)
Max straight
Length
ft (m)
Min straight
Length
ft (m)
Through the Wall 1 45 (13.7) 2 (.6)
Through the Wall 2 40 (12.2) 2 (.6)
Through the Wall 3 35 (10.7) 2 (.6)
Through the Wall 4 30 (9.1) 2 (.6)
Through the Roof 0 50 (15.2) 7 (2.1)
Through the Roof 1 45 (13.7) 7 (2.1)
Through the Roof 2 40 (12.2) 7 (2.1)
Through the Roof 3 35 (10.7) 7 (2.1)
Through the Roof 4 30 (9.2) 7 (2.1)