Venting System Example Installation For All Models - Lochinvar POWER DIRECT VENTED GAS MODELS Instruction Manual

4. The unit cannot be connected to existing vent piping or chimney.
5. When venting through an outside wall, the vents must terminate
horizontally to the outdoors.
B. All 50 Gallon 65,000 BTU/HR Models
In the carton is supplied:
1. Two 3" inlet and outlet PVC Schedule 40 - 45° vent caps.
2. One 3" ABS Schedule 40 - 90° street elbow; used to connect the
outlet vent pipe to the water heater when the outlet vent pipe is
to be turned horizontally directly off the blower.
3. One 5' (1.5 m) section of 3" ABS Schedule 40 outlet vent pipe.
(More may be required and must be purchased locally.)
FIGURE 19.
Requirements:
1. The water heater requires its own (separate) venting system.
2. Only 3" CPVC or ABS Schedule 40 piping and fi ttings are acceptable
materials on the fi rst fi ve feet of the outlet vent system.
3. 3" PVC, ABS, or CPVC Schedule 40 piping and fi ttings are
acceptable materials for the inlet vent system and for the outlet
vent system after the fi rst fi ve feet.
4. The unit cannot be connected to existing vent piping or chimney.
5. When venting through an outside wall, the vents must terminate
horizontally to the outdoors.
C. All 40 and 50 Gallon 40,000 BTU/HR Models
In the carton is supplied:
1. Two 3" inlet and outlet PVC Schedule 40 - 45° vent caps.
All other piping must be supplied by the supplier.
FIGURE 20.
* If making an immediate horizontal run of vent off the blower,
one 3" PVC or ABS Schedule 40 street elbow is required for the
outlet. In addition, one 3" PVC or ABS Schedule 40 elbow and
one section of 3" PVC pipe (a minimum of 3" long) is required
for the inlet.
VENTING SYSTEM EXAMPLE INSTALLATIONS FOR
ALL MODELS
Do not run the vent piping downward under any circumstances.
See Figure 21.
Correct installation of the vent piping:
1. Horizontal runs require a minimum 1/8" (3.2 mm) rise per fi ve feet
of length.
2. The total vertical and horizontal vent runs cannot exceed the
maximum length with the number of 90° elbows as specifi ed in
the table below. If more elbows are required, the venting distance
must be reduced 5 feet (1.5 m) for every 90° elbow:
TABLE 1: The number of 90° elbows shown in the table is for both
the intake air and vent pipes. IE: The vent pipe can contain three 90°
elbows, the intake air pipe can also contain three 90° elbows.
3" DIA. VENTS MAX.
LENGTH (FT.)
45
40
35
*NOTE: Two 45° elbows are equivalent to one 90° elbow. One 90°
elbow equals 5 feet (1.5 m) of equivalent vent length.
18
FIGURE 21.
FIGURE 22.
NUMBER OF 90°
ELBOWS*
1
2
3
FIGURE 23A.