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. Refer to VAA instruction on page 26 while planning the vent system.
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 2.
| | TABLE 2. | |
| | | |
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’ (61cm) 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 blower discharge before adding a reducer to acquire desired pipe diameter. An appropriately sized 45 degree schedule 40 DWV elbow (field supplied) vent terminal must be obtained with an equivalent screen (supplied in vent kit).
The total system cannot exceed 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).
NOTE: This unit can be vented with PVC pipe materials (DWV ASTM-D2665 or CSA B181.2; Schedule 40, 80, 120 ASTM-D1785 or CSA B137.3; or SDR Series ASTM-D2241 or CSA B137.3), CPVC pipe materials (CPVC41 ASTM-D2846 or CSA B137.6; Schedule 40, 80 ASTM-F441 or CSA B137.6; or SDR Series ASTM-F442), ABS pipe materials (Schedule 40 DWV ASTM-D2661 or CSA B181.1). Fittings, other than TERMINATION should be equivalent to PVC-DWV fittings meeting ASTM D-2665 (Use CPVC fittings, ASTM F-438 for CPVC pipe and ABS fittings, ASTM D-2661/3311 for ABS pipe). If CPVC or ABS pipe and fittings are used, then proper cement must be used for all joints, including joining pipe to Termination (PVC Material). If local codes do not allow use of PVC termination when a material other than PVC is used for venting, then an equivalent fitting of that material may be substituted if screen in PVC terminal is removed and inserted into new fitting.
PVC Materials should use ASTM D-2564 Grade Cement; CPVC Materials should use ASTM F-493 Grade Cement and ABS Materials should use ASTM D-2235 Grade Cement.
If water heater is being installed as a replacement for an existing power vented heater in pre-existing venting, a thorough inspection of existing venting system must be performed prior to any installation work. Verify that correct material as detailed above has been used, and that minimum or maximum vent lengths and terminal location as detailed in this manual have been met. Carefully inspect entire venting system for any signs
of cracks or fractures, particularly at joints between elbows and other fittings and straight runs of vent pipe. Check system for signs of sagging or other stresses in joints as a result of misalignment of any components in system. If any of these conditions are found, they must be corrected in accordance with venting instructions in this manual before completing installation and putting water heater into service.
NOTE: A. For water heaters in locations with high ambient temperatures (above 100°F) it is recommended that CPVC or ABS pipe and fittings be used. B. A 22.5 degree elbow (2” vent pipe) or a 45 degree elbow (3” and 4” vent pipe) with an installed screen VENT TERMINAL must be used in all cases.
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 condensate to drain safely. One hose from blower housing, two flexible hoses from blower outlet adaptor, along with another flexible hose from VAA if installed, run to barb fittings on vent pipe assembly #2. Hose is clamped by rubber clips and flexible hoses by a clamp on jacket top cover. See Figure 17. Condensate drains from the unit at the exhaust tee located at the bottom of the unit (see figure 16). 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 field supplied drain lines beyond the 1/2” adaptor of vent pipe assembly #1 should be installed continuously tilted downward toward an appropriate drain. See Figure 16. If these instructions are not followed or if condensate drain line is blocked, water will spill from condensate trap. Do not block the holes in the hex plug on top of a small tee in vent pipe assembly #1. As with every water heater installation, a drain pan should be used to prevent water damage to surrounding area. If necessary, a condensate pump with an incorporated reservoir may be used to pump water to an appropriate drain. To avoid condensate spillage, select a pump with an overflow switch.
Caution must be used to ensure that drain is free and clear of debris and will not allow backflow through the condensate drain line. 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 condensate lines. Please ensure that the outlet of condensate drain does not create a slippery condition which could lead to personal injury. Care should be taken to ensure there is no kink or twist in any condensate hose. If a VAA is not installed, the unused barb fitting in vent pipe assembly #2 should be plugged using one of the break- away plugs.
Breathing Hazard - Carbon Monoxide Gas
•Do NOT block the holes in the hex plug of vent pipe assembly #1.
•Do NOT elevate any portion of the field supplied drain line beyond the 1/2" adaptor above the adaptor. This
must be true for entire length of the drain line including
• the exit into an appropriate drain.
•
•
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
