A.O. Smith BTX-80 warranty Preparation of Blower Assembly, Condensate System Figure

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 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 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 (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 5, 8 and 9.

CONDENSATE

WARNING

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 4) AND FROM TWO PLACES ON THE BLOWER ASSEMBLY (SEE FIGURE 5). 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 4. 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 AND WILL NOT ALLOW BACKFLOW THROUGH THE CONDENSATE HOSE. 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.

The condensate trap may be primed by filling the CONDENSATE U-ASSEMBLY with tap water using the supplied hose while the water heater is not operating. The system is fully primed when the hose is lowered below the hose clamp on the side of the water heater and water begins to flow out of the hose. In most installations the water heater will self-prime the condensate trap during the first full heat-up cycle. IF A SOUND OF AIR BUBBLING THROUGH WATER (GURGLING) IS HEARD WHILE THE BLOWER IS OPERATING AFTER THE FIRST HEAT-UP CYCLE, THEN TURN THE UNIT OFF AND CONTACT YOUR PLUMBER OR SERVICE REPRESENTATIVE.

IF THESE INSTRUCTIONS ARE NOT FOLLOWED, THE CONDENSATE BUILD-UP WILL BLOCK THE EXHAUST OUTLET, WHICH WILL CAUSE IMPROPER OPERATION.

CONDENSATE SYSTEM - FIGURE 4

Condensate is likely to form in the venting system attached to this water heater. The vent pipe should be sloped downward away from the blower assembly (not less than 1/8" (3.2 mm) nor greater than 1/2" (12.7 mm) per foot maximum). If the vent piping is vented level or sloped upwards away from the blower assembly, then adequate means for draining and disposing of the condensate needs to be made by the installer. In either case, a 3/8" drain hose should be connected to the built-in drain port. Prior to operating the water heater, make sure the removable cap is installed on the second drain port (See Figure 5).

PREPARATION OF BLOWER ASSEMBLY

1.Check to make sure that the wire harness is attached to the gas valve and blower control box.

2.Make sure no material is still attached to the outside or inside of blower assembly.