Westinghouse WER080C2X045 Installation Manual download pdf (Page 8)

WHL-003 REV. 7.14.14

 Incorrectly-sized expansion tank

5. All piping should be insulated. Additionally, place the water heater so that the drain, controls, and inlets/outlets are easily accessible.

If you do not provide the minimum clearances shown, it might not be possible to service the heater without removing it from the space.

NOTE: When installing in a zero clearance location, it may not be possible to read or view some product labeling. It is recommended to

make note of the water heater model and serial number.

6. This water heater must be installed vertical on a level surface.

PART 3 – HEATER PIPING

A. PLUMBING

It is mandatory that all plumbing be done in accordance with federal, local, and state plumbing codes and practices. Failure to properly

install the water heater WILL VOID the warranty. It is also necessary to use both thread tape and pipe dope on all mechanical plumbing

connections.

Use unions on the hot and cold water connections, so that the heater may be easily disconnected for servicing when necessary.

Dielectric unions or galvanized steel fittings must not be used in a system with this water heater. Doing so WILL VOID the warranty.

Use only copper, brass, or stainless steel fittings. Teflon thread sealant must be used on all connections.

NOTE: It is recommended to install a shut-off valve in the cold water line.

1. Connect cold water line to the connection marked “COLD” on the top of the water heater.

Do not apply heat to the Hot or Cold water heater connections. If sweat connections are used, sweat tubing to the adapter before fitting

adapter to the water connections on the heater. Any heat applied to the water heater connections will permanently damage the dip tube

and/or heat traps. Damages due to improper installation practices ARE NOT covered by warranty.

2. Connect hot water line to the connection marked “HOT” on the top of the heater.

3. An opening is provided near the top of the heater for installation of a Temperature and Pressure Relief Valve (T&P Valve).

4. Install drain valve in the opening provided near the bottom of the heater.

B. THERMAL EXPANSION

A check valve may be installed in the cold water inlet line as a separate backflow preventer, or may be part of a pressure reducing

valve, water meter, or water softener. An “open water system” refers to a system without a check valve. A “closed water system”

refers to a system with a check valve installed in the cold water inlet line.

As water is heated, it expands in volume and increases pressure within the water system. This action is referred to as “thermal

expansion”. In an open water system, expanding water which exceeds the capacity of the system flows back into the city main where

pressure is easily dissipated.

A closed water system prevents expanding water from flowing back into the city main. The resulting thermal expansion can rapidly

increase pressure in the water heater and system piping. This rapid pressure increase can exceed the safety setting of the relief valve,

causing it to operate during each heating cycle. This rapid and repeated expansion and contraction of components in the system can

cause premature failure of system components, including the relief valve and possibly the water heater. Replacing the relief valve will

not correct thermal expansion.

A potable hot water expansion tank is required to offset thermal expansion. Expansion tanks are designed with an air cushion built in

that compresses as system pressure increases, thereby relieving the overpressure condition and eliminating repeated operation of the

relief valve. This expansion tank should be installed in the cold water line between the water heater and the check valve, and must be

sized for the entire water volume of the hot water system. See Figure 3.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 22 23

No comments

Westinghouse WER080C2X045 Installation Manual Page 8