LAARS POWER VENTED GAS WATER HEATER - Installation Manual - Manual (Page 11)

11
Part I - Venting Specifications for:
48 Gallon (181.6 L)
65 Gallon (246.0 L)
NOTE: Properly sized PVC, CPVC, or ABS* pipe must be used.
This water heater is a power vented appliance and is designed to vent its
products of combustion through 3” (7.6 cm) or 4” (10.2 cm) diameter Schedule
40 (solid or cellular core) vent pipe to the outdoors. This water heater may be
either vented horizontally through the wall or vertically through the roof. Use a
3” (7.6 cm) to 4” (10.2 cm) reducer to connect to the vent outlet when using 4”
(10.2 cm) vent pipe. Apply the proper cement at the joint locations. Table 1
lists the maximum vent lengths for this water heater using 3” (7.6 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 3” (7.6
cm) vent pipe in Table 1, then use 4” (10.2 cm) vent pipe for the vent
connector.
Table 2 lists the venting distances allowed with 4” (10.2 cm) diameter vent pipe.
When venting with 4” (10.2 cm) vent pipe, use a 4” (10.2 cm) to 3” (7.6 cm)
reducer to exit through the building wall with 3” (7.6 cm) vent pipe. Use the 3”
(7.6 cm) vent terminal supplied with the water heater to terminate on the
outside of the building. If the length of 3” (7.6 cm) vent pipe needed to go
through the wall is greater than 14” (35.5 cm), use 4” (10.2 cm) to go through
the wall and reduce to 3” (7.6 cm) vent pipe immediately after exiting the
outside wall. Refer to the venting illustrations on the following pages. Make
sure the vent pipe terminal elbow fitting is at least 1” (2.5 cm) away from the
edge of the wall.
*Only vent pipe certified to ULC S636 may be used in Canada.
TABLE 1 - VENT CONNECTOR LENGTHS
FOR 3” (7.6 cm) DIAMETER VENT PIPE
Maximum straight
Length ft (m)
Terminating # of Elbows
48, 65 gal.
Minimum
straight
Length
ft (m)
Through the Wall 1 55 (16.8) 2 (.6)
Through the Wall 2 50 (15.2) 2 (.6)
Through the Wall 3 45 (13.7) 2 (.6)
Through the Wall 4 40 (12.2) 2 (.6)
Through the Roof 0 60 (18.3) 7 (2.1)
Through the Roof 1 55 (16.8) 7 (2.1)
Through the Roof 2 50 (15.2) 7 (2.1)
Through the Roof 3 45 (13.7) 7 (2.1)