PLANNING THE VENT SYSTEM
Plan the route of the vent system from the discharge of the blower to the planned location of the vent terminal.
1.Layout total vent system to use a minimum of vent pipe and elbows.
2.This water heater is capable of venting flue gases equivalent to 25' (7.6 m) of 2" pipe, 65' (19.8 m) of 3" pipe, or 128' (39.0 m) of 4" pipe as listed in Table 1.
TABLE 1
Number of | 2" Maximum | 3" Maximum | 4" Maximum |
90° Elbows | Pipe - ft. (m) | Pipe - ft. (m) | Pipe - ft. (m) |
1 | 20 (6.1) | 60 (18.3) | 120 (36.6) |
2 | 15 (4.6) | 55 (16.8) | 112 (34.1) |
3 | 10 (3.0) | 50 (15.2) | 104 (31.7) |
4 | -- | 45 (13.7) | 96 (29.3) |
5 | -- | 40 (12.2) | 88 (26.8) |
6 | -- | 35 (10.7) | 80 (24.3) |
The minimum vent lengths for each of the pipe sizes is one 90° on top of the unit plus 2' (61 cm) of straight pipe and the appropriate termination.
NOTE: The equivalent feet (m) of pipe listed above are exclusive of the termination. That is, the termination, with an installed screen, is assumed to be in the system and the remainder of the system must not exceed the lengths discussed above.
3.The blower discharge adapter is made to accept only straight sections of 2" pipe. To start, a minimum of 2 inches (5.1 cm) of 2" pipe must be attached to the blower discharge, see Figure 17.
If using 2" inch vent pipe:
A minimum of 2 inches (5.1 cm) must be attached to the blower before the first elbow. After the first elbow add the additional venting required for the installation. The total system cannot exceed the lengths discussed above, where each elbow is equal to 5 feet (1.5 m) of straight pipe.
If using 3" or 4" inch vent pipe:
Two inches (5.1 cm) of pipe must be attached to the blower discharge before adding a reducer to acquire the desired pipe diameter. An appropriately sized 45 degree elbow (supplied locally-a schedule 40 DWV)ventterminalmustbeobtainedwithanequivalentscreen(supplied in vent kit). The total system cannot exceed the equivalent pipe lengths discussed above where each elbow is equal to 5 feet (1.5 m) of straight pipe (3" vent pipe) or 8 feet (2.4 m) of straight pipe (4" vent pipe).
U.S. Installations
NOTE: This unit can be vented with PVC pipe materials (Cellular Core ASTM-F891; DWV ASTM-D2665 or CSAB181.2; Schedule 40, 80, 120 ASTM-D1785orCSAB137.3;orSDRSeriesASTM-D2241orCSAB137.3), CPVC pipe materials (CPVC41ASTM-D2846 or CSAB137.6; Schedule 40, 80ASTM-F441 or CSAB137.6; or SDR SeriesASTM-F442),ABS pipe materials (Schedule 40 DWVASTM-D2661 or CSAB181.1 or Schedule
40DWVCellularCoreASTM-F628).Thefittings,otherthantheTERMINATION should be equivalent to PVC-DWV fittings meeting ASTM D-2665 (Use CPVC fittings,ASTM F-438 for CPVC pipe andABS fittings,ASTM D-2661/ 3311 for ABS pipe). If CPVC or ABS pipe and fittings are used, then the proper cement must be used for all joints, including joining the pipe to the Termination (PVC Material). If local codes do not allow the use of the PVC termination when a material other than PVC is used for venting, then an equivalent fitting of that material may be substituted if the screen in the PVC terminal is removed and inserted into the new fitting.
PVC Materials should useASTM D-2564 Grade Cement; CPVC Materials should use ASTM F-493 Grade Cement and ABS Materials should use ASTM D-2235 Grade Cement.
Canadian Installation of this water heater must comply with CAN/CSA B149.1 - Natural Gas and Propane Installation Code which requires the vent system components be certified to ULC S636.
This water heater has been design certified to be vented with PVC pipe certified and marked as complying with ULC S636. This water heater is supplied with a 2 inch 22.5 degree termination elbow that is
a special fitting that must be used with this appliance. Any outlet piping, fittings and glue used to vent this appliance that is not supplied by the manufacturer must comply with the ULC S636 requirements.
If the water heater is being installed as a replacement for an existing power vented heater in pre-existing venting, a thorough inspection of the existing venting system must be performed prior to any installation work. Verify that the correct material as detailed above has been used, and that the minimum or maximum vent lengths and terminal location as detailed in this manual have been met. Carefully inspect the entire venting system for any signs of cracks or fractures, particularly at the joints between elbows and other fittings and the straight runs of vent pipe. Check the system for signs of sagging or other stresses in the joints as a result of misalignment of any components in the system. If any of these conditions are found, they must be corrected in accordance with the venting instructions in this manual before completing the installation and putting the water heater into service.
NOTE: A. For water heaters in locations with high ambient temperatures (above100°F)itisrecommendedthatCPVCorABSpipeandfittingsbeused. B.A 22.5 degree elbow (2" vent pipe) or a 45 degree elbow (3" and 4" vent pipe)withaninstalledscreenVENTTERMINALmust beusedinallcases.
4.There will be some installations where condensate will be formed in the horizontal runs of the vent system. This condensate will run into the condensate boot attached to the blower and out the fitting. The water heater is shipped with condensate hose that attaches to the fitting on the condensate boot. No other Tee or fitting is required. See Figures 17, 20 and 21.
CONDENSATE
This water heater is a condensing unit and requires a drain to be located in close proximity to allow the condensate to drain safely. The condensate drains from the unit at the exhaust tee located at the bottom of the unit (see figure 16) and from two places on the blower assembly (see figure 17). Condensate from this water heater is mildly acidic. Please note that some local codes require that condensate is treated by using a pH neutralizing filter prior to disposal.
NOTE: It is important that the condensate hose on the bottom of the unit is not installed elevated above the clamp that is secured to the side of the jacket, see figure 16. This must be true for the entire length of the hose from the clamp to the exit into an appropriate drain. If these instructions are not followed or if the condensate hose is blocked, water will spill from the condensate trap. As with every water heater installation, a drain pan should be used to prevent water damage to the surrounding area. If necessary, a condensate pump with an incorporated reservoir may be used to pump the water to an appropriate drain. To avoid condensate spillage, select a pump with an overflow switch.
Caution must be used to ensure that the drain is free and clear of debris andwillnotallowbackflowthroughthecondensatehose.Consideration must be given to avoid freezing of the condensate lines which could result in excessive build up of condensate inside the water heater. Waterproof heat tape may be required to prevent freezing of the condensate lines. Please ensure that the outlet of the condensate drain does not create a slippery condition which could lead to personal injury.
