Ao-smith 315795-000 MH User Manual download pdf (Page 14)

WATER PIPING

HOTTER WATER CAN SCALD:

Water heaters are intended to produce hot water. Water heated to

a temperature which will satisfy space heating, clothes washing,

dish washing, cleaning and other sanitizing needs can scald and

permanently injure you upon contact. Some people are more likely

to be permanently injured by hot water than others. These include

the elderly, children, the inﬁ rm, or physically/mentally handicapped.

If anyone using hot water in your home ﬁ ts into one of these groups

or if there is a local code or state law requiring a certain temperature

water at the hot water tap, then you must take special precautions. In

addition to using the lowest possible temperature setting that satisﬁ es

your hot water needs, a means such as a *mixing valve should be

used at the hot water taps used by these people or at the water heater,

see Figure 2. Valves for reducing point of use temperature by mixing

cold and hot water are also available. Consult a Qualiﬁ ed Installer or

Service Agency. Follow manufacturer’s instructions for installation

of the valves. Before changing the factory setting on the thermostat,

read the “Temperature Regulation” section in this manual.

This water heater shall not be connected to any heating systems or

component(s) used with a non-potable water heating appliance.

Toxic chemicals, such as those used for boiler treatment shall not

be introduced into this system.

Water supply systems may, because of such events as high line

pressure, frequent cut-offs, the effects of water hammer among

others, have installed devices such as pressure reducing valves,

check valves, back ﬂ ow preventers, etc. to control these types of

problems. When these devices are not equipped with an internal

by-pass, and no other measures are taken, the devices cause the

water system to be closed. As water is heated, it expands (thermal

expansion) and closed systems do not allow for the expansion of

heated water.

The water within the water heater tank expands as it is heated and

increases the pressure of the water system. If the relieving point

of the water heater’s temperature-pressure relief valve is reached,

the valve will relieve the excess pressure. The temperature-

pressure relief valve is not intended for the constant relief of

thermal expansion. This is an unacceptable condition and must

be corrected.

It is recommended that any devices installed which could create a

closed system have a by-pass and/or the system have an expansion

tank to relieve the pressure built by thermal expansion in the water

system. Expansion tanks are available for ordering through a local

plumbing contractor. Contact the local water supplier and/or a service

agency for assistance in controlling these situations.

NOTE: To protect against untimely corrosion of hot and cold

water ﬁ ttings, it is strongly recommended that di-electric unions

or couplings be installed on this water heater when connected

to copper pipe.

Figure 24 shows the typical attachment of the water piping to the

water heater. The water heater is equipped with 3/4 inch NPT water

connections.

FIGURE 24.

T & P VALVE AND PIPE INSULATION

1. Locate the temperature and pressure relief valve on the water

heater (also known as a T&P relief valve). See Figure 25.

2. Locate the slit running the length of the T&P relief valve

insulation.

3. Spread the slit open and ﬁ t the insulation over the T&P relief

valve. See Figure 25. Apply gentle pressure to the insulation

to ensure that it is fully seated on the T&P Relief Valve. Once

seated, secure the insulation with duct tape. IMPORTANT: The

insulation or tape should not block or cover the T&P relief valve

drain opening. Also, the insulation or tape should not block or

hinder access to the manual relief lever (Figure 25).

4. Locate the hot water (outlet) & cold water (inlet) pipes to the

water heater.

5. Locate the slit running the length of a section of pipe insulation.

6. Spread the slit open and slip the insulation over the cold water

(inlet) pipe. Apply gentle pressure along the length of the

insulation to ensure that it is fully seated around the pipe. Also,

ensure that the base of the insulation is ﬂ ush with the water heater.

Once seated, secure the insulation with duct tape.

7. Repeat steps 5 and 6 for the hot water (outlet) pipe.

8. Add additional sections of pipe insulation as needed.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 55 56

Comments to this Manuals

No comments

Ao-smith 315795-000 MH User Manual Page 14

Comments to this Manuals

Related products and manuals for Water boiler Ao-smith 315795-000 MH