A.O. Smith FDVT Water Potable Heating And Space Heating, Closed Water System, Gas Connections

the heater. Such pans should have a minimum length and width of at least 2 inches greater than the diameter of the heater and should be piped to an adequate drain. Drain pans suitable for these heaters are available from your dealer or A. O. Smith Water Products Company, 5621 W. 115th Street, Alsip, IL 60803. Contact us at our website: www.hotwater.com, phone: 800.433.2545, or fax: 1.800.433.2515.

Under no circumstances is the manufacturer to be held liable for any water damage in connection with this water heater.

	Vapors from flammable	Water heater has a main burner
liquids may explode and catch		and pilot flame. The pilot flame:
fire causing death or severe
burns.		1.	is on all the time and
Do not use or store flammable		2.	will ignite flammable vapors.
products such as gasoline,		Vapors:
solvents or adhessives in the
same room or area near the water		1.	cannot be seen,
heater.
Keep flammable products:		2.	are heavier than air,
		3.	go a long way on the floor
1. far away from heater,			and
		4.	can be carried from other
2.	in approved containers,
			rooms to the pilot flame by
3.	tightly closed and
			air currents.
4. out of children’s reach.
Installation:		above the floor. This will
Do not installwater heater where
flammable products will be stored		reduce, but not eliminate the
or used unless the main burner		risk of vapors being ignited by
and pilot flames are at least 18”		the main burner or pilot flame.

The location selection must provide adequate clearances for servicing and proper operation of the water heater.

WARNING

DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A CARPETED FLOOR. A FIRE HAZARD MAY RESULT. Instead the water heater must be placed on a metal or wood panel extending beyond the full width and depth by at least 3 inches (76.2mm) in any direction. If the heater is installed in a carpeted alcove or closet, the entire floor shall be covered by the panel.

Refer to figure 1 for typical installation. A suitable pipe thread sealant must be used to prevent leakage.

WATER (POTABLE) HEATING AND SPACE HEATING

1.All piping components connected to this unit for space heating applications shall be suitable for use with potable water.

2.Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system.

3.This unit may NEVER be connected to any existing heating system or component(s) previously used with a non-potable water heating appliance.

4.When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed. Please refer to Fig. 2 for suggested piping arrangement.

CLOSED WATER SYSTEM

FIGURE 2

A closed system will exist if a back-flow preventer (check valve), pressure reducing valve, or other similar device is installed in the cold water line between the water heater and the street main (or well). Excessive pressure may develop due to the thermal expansion of heated water causing premature tank failure or intermittent relief valve operation. This type of failure is not covered by the limited warranty. An expansion tank may be necessary in the cold water supply to alleviate this situation, see fig. 1. Contact the local plumbing authority.

If the temperature and pressure relief valve on the appliance discharges periodically, this may be due to thermal expansion in a closed water supply system. Contact the water supplier or local plumbing inspector on how to correct this situation. DO NOT PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE.

GAS CONNECTIONS

The minimum gas supply pressure for input adjustment is 5.0” W.C. (1.2 kPa) for natural gas and 11.0” W.C. for propane gas.

THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN 10.5” WATER COLUMN (2.6 kPa) SUPPLY PRESSURE. EXPOSURE TO HIGHER GAS SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE CONTROL WHICH COULD RESULT IN FIRE OR EXPLOSION. If over-pressure has occurred such as through improper testing of gas lines or emergency malfunction of the supply system, the control must be checked for safe operation.

Make sure that the outside vents on the supply regulators and the safety vent valves are protected against blockage. These are parts of the gas supply system not the heater. Vent blockage may occur during ice storms.

IT IS IMPORTANT TO GUARD AGAINST CONTROL FOULING FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.

All piping must comply with local codes and ordinances or with the current edition of National Fuel Gas Code (ANSI Z223.1/NFPA- 54) whichever applies.

REFER TO FIG. 1 FOR CONNECTION DETAILS. BEFORE ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS CLEAN ON THE INSIDE.

TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED DRIP LEG) MUST BE INCORPORATED IN THE PIPING, FIG. 1. The dirt leg must be readily accessible. Install in accordance with recommendations of serving gas supplier. Refer to the latest edition of the National Fuel Gas Code ANSI Z223.1.

To prevent damage, care must be taken not to apply too much

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