A.O. Smith 317443-000, 100 Power Vent DV Series 120 Gas piping, Condensate Piping

gas piping

Make sure gas supplied is same type listed on model rating plate. The inlet gas pressure must not exceed 14 inch water column (3.5 kPa) for natural and propane gas (L.P.). The minimum inlet gas pressure shown on rating plate is that which will permit firing at rated input.

All gas piping must comply with local codes and ordinances or with the National Fuel Gas Code (ANSI Z223.1/ NFPA-54). Copper or brass tubing and fittings (except tin lined copper tubing) shall not be used.

If the gas control valve is subjected to pressures exceeding 1/2 psi (3.5 kPa), the damage to the gas control valve could result in a fire or explosion from leaking gas.

If the main gas line Shut-off serving all gas appliances is used, also turn “off” the gas at each appliance. Leave all gas appliances shut “off” until the water heater installation is complete.

A gas line of sufficient size must be run to the water heater. Consult the current edition of National Fuel Gas Code (ANSI Z223.1/NFPA 54) and your gas supplier concerning pipe size.

There must be:

•A readily accessible manual shut off valve in the gas supply line serving the water heater, and

•A drip leg (sediment trap) ahead of the gas control valve to help prevent dirt and foreign materials from entering the gas control valve.

•A flexible gas connector or a ground joint union between the shut off valve and control valve to permit servicing of the unit.

Be sure to check all the gas piping for leaks before lighting the water heater. Use a soapy water solution, not a match or open flame. Rinse off soapy solution and wipe dry.

CONDENSATE Piping

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 12). 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.

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.

CONDENSATION WARNING: THIS WATER HEATER IS A CONDENSING UNIT AND REQUIRES A DRAIN TO BE LOCATED IN CLOSE PROXIMITY TO ALLOW CONDENSATE TO DRAIN SAFELY. THE CONDENSATE DRAINS FROM UNIT AT THE EXHAUST ELBOW LOCATED AT BOTTOM OF UNIT. NOTE: IT IS IMPORTANT THAT THE CONDENSATE HOSE NOT BE ELEVATED ABOVE THE EXHAUST ELBOW, SEE FIGURE 12. CONDENSATE BUILD-UP WILL BLOCK THE EXHAUST OUTLET, WHICH WILL CAUSE IMPROPER OPERATION.

Figure 12

The condensate drain line must be routed to a suitable drain. If no floor drain is available or the drain is above the level of the condensate line, install a condensate pump that is resistant to the acidic condensate. These pumps are available from local distributors. If the pump is not resistant to acidic water, a condensate neutralizer must be used ahead of the pump. When installing the drain line, note the following:

•Plastic pipe or tubing must be used to connect the condensate drain to a suitable drain or condensate pump. Do not use copper tubing, iron, or steel pipe for the condensate drain line.

•Condensate drain lines should be installed in conditioned areas only. Drain lines installed in areas that are subject to freezing temperatures should be wrapped with a nationally recognized/listed heat tape and/or approved insulation for freeze protection. Install per manufacturer’s instructions.

•Do not common drain with the temperature and pressure relief valve or the condensate line from an air conditioner evaporator coil.

•Slope the condensate drain toward the inside floor drain or condensate pump.

•The condensate drain line and connection to the drain piping must comply with all local codes.

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