Lochinvar SNA500-125, SNR200-100, SNA285-125 System piping, System water piping methods, Scalding

TM

Installation & Service Manual

6System piping

System water piping methods

Observe a minimum of one inch clearance around all un-insulated hot water pipes when openings around the pipes are not protected by non-combustible materials.

2. If this water heater is installed in a closed water supply

system, such as the one having a backflow preventer in the

cold water supply, provisions must be made to control

thermal expansion. DO NOT operate this water heater in a

closed system without provisions for controlling thermal

￿WARNING

Failure to install and maintain a new, listed temperature and pressure relief valve will release the manufacturer from any claim, which might result from excessive temperature and pressures.

Keep clear of the combination temperature and pressure relief valve discharge line outlet. The discharge may be hot enough to cause scald injury. The water is under pressure and may splash.

Hydrogen gas can be produced in an operating water heater that has not had water drawn from the tank for a long period of time (generally two weeks or

more). HYDROGEN GAS IS EXTREMELY FLAMMABLE. To prevent the possibility of injury under these conditions, we recommend the hot water faucet to be open for several minutes at the kitchen sink before you use any electrical appliance, which is connected to the hot water system. If hydrogen is present, there will be an unusual sound such as air escaping through the pipes as hot water begins to flow. Do not smoke or have an open flame near the faucet at the time it is open.

expansion. Warranties do not cover damages from thermal

expansion such as pressure bulges and/or deformities. Your

water supplier or local plumbing inspector should be

contacted on how to control this situation.

3. After installation of the water lines, open the main water

supply valve and fill the water heater. While the water

heater is filling, open several hot water faucets to allow air to

escape from the water system. When a steady stream of

water flows through the faucets, close them and check all

water connections for possible leaks.

4. Never operate the water heater without first being certain it

is filled with water.

Scalding

This water heater can deliver scalding temperature water at any faucet in the system. Be careful whenever using hot water to avoid scalding injury. Certain appliances such as dishwashers and automatic clothes washers may require increased temperature water. By setting the thermostat on this water heater to obtain the increased temperature water required by these appliances, you may create the potential for scald injury. To protect against injury, you should install an ASSE approved mixing valve in the water system. This valve will reduce point of discharge temperature by mixing cold and hot water in branch supply lines. Such valves are available from the local plumbing supplier.

Figure 6-1Scald Warning

General piping information

Basic steps are listed below along with illustrations on the following pages (FIG.’s 6-2 thru 6-4), which will guide you through the installation of the Shield water heater.

1.BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE MAIN WATER SUPPLY VALVE. After shutting off the main water supply, open a faucet to relieve the water line pressure to prevent any water from leaking out of the pipes while making the water connections to the water heater. The COLD water inlet and HOT water outlet are identified on the water heater. Make the proper plumbing connections between the water heater and the plumbing system to the building. Install a shutoff valve in the cold water supply line.

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Water temperatures over 125°F (52°C) can cause severe burns instantly or death from scalds.

Children, disabled, and elderly are at highest risk of being scalded.

See instruction manual before setting the thermostat at the water heater.

Feel water before bathing or showering.

Temperature limiting valves are available, consult local plumbing supplier.