A.O. Smith GDVS Water Potable Heating and Space Heating, Closed Water System, GAS Connections

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, 500 Tennessee Waltz Parkway, Ashland City, TN 37055. Contact us at our website: www.aosmithwaterheaters.com,phone: 800.433.2545, or fax: 1.800.433.2515.

Water heater life depends upon water quality, water pressure and the environment in which the water heater is installed. Water heaters are sometimes installed in locations where leakage may result in property damage, even with the use of a drain pan piped to a drain. However, unanticipated damage can be reduced or prevented by a leak detector or water shut-off device used in conjunction with a piped drain pan. These devices are available from some plumbing supply wholesalers and retailers, and detect and react to leakage in various ways:

•Sensors mounted in the drain pan that trigger an alarm or turn off the incoming water to the water heater when leakage is detected.

•Sensors mounted in the drain pan that turn off the water supply to the entire home when water is detected in the drain pan.

•Water supply shut-off devices that activate based on the water pressure differential between the cold water and hot water pipes connected to the water heater.

•Devices that will turn off the gas supply to a gas water heater while at the same time shutting off its water supply.

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 adhesives in the same
room or area near the water heater.		1.	cannot be seen,
Keep flammable products:		2.	are heavier than air,
1.	far away from heater,	3.	go a long way on the floor
			and
2.	in approved containers,	4.	can be carried from other
3.	tightly closed and		rooms to the pilot flame by
4. out of children’s reach.			air currents.
Installation:
Do not install water heater where		above the floor. This will
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, see Figure 2 for suggested piping arrangement.

FIGURE 2

CLOSED WATER SYSTEM

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 Figure 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.

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