Weil-McLain GL-E223-ADOC 0311 manual Domestic water piping continued

AQUA PLUS indirect-fired water heaters — Product Manual

Domestic water piping (continued)

LEGEND for Figure 2, page 6

Domestic water supplied to fixtures that could pose an injury hazard due to high temperature, such as showers and faucets, should be equipped with a temperature regulating device, such as an anti-scald mixing valve.

When the supply pressure is higher than 70 PSIG, install a pressure reducing valve on cold water supply line to prevent water loss through T&P relief valve. A thermal expansion tank is also required.

This symbol, where used in this manual, indicates the item is required by Massachusetts code.

Do not install any valve between T&P relief valve and tank connection, or on T&P relief valve discharge piping. Do not plug T&P relief valve or its discharge piping. Improper placement and piping of T&P re- lief valve can cause severe personal injury, death or substantial property damage.

11Temperature adjustment knob

12Anode access

•The anode is specially made for this water heater. Use only the anode available from Weil-McLain, as listed in Replacement parts.

13Mixing valve — — RECOMMENDED

This symbol indicates the item is optional, unless required by applicable codes.

1Domestic cold water inlet connection — see Fig- ure 3, page 6 for size

2Domestic hot water outlet connection — see Fig- ure 3, page 6 for size

3Domestic recirculation connection — see Fig- ure 3, page 6 for size

4Boiler water inlet to coil — see Figure 3, page 6 for size

5Boiler water outlet from coil — see Figure 3, page 6 for size

6Drain valve — provided by installer

•Install a drain valve on the DHW inlet to the water heater as shown.

7Piping from drain valve

•Pipe from drain to floor drain, if available.

8 T&P valve connection

9T&P relief valve — supplied with water heater

•Use only the T&P valve supplied with the water heater. See Replacement parts for part number.

•Install the T&P relief valve in the top center tapping, as shown.

10T&P relief valve discharge piping —

•must be made of material serviceable for temperatures of 250°F or greater.

•must be directed so that hot water flows away from all persons.

•must be directed to a suitable place for disposal.

•must be installed so as to allow complete draining of the T&P relief valve and discharge line.

•must NOT be excessively long — using more than 2 el- bows or 15 feet of piping can reduce discharge capacity.

•must NOT be directly connected to a drain — terminate discharge piping within 6” from floor — refer to local codes.

•must NOT be plugged, reduced or restricted.

•must NOT be subjected to freezing.

Part number GL-E223-ADOC 0311

•See Replacement parts for thermostatic mixing valves available from Weil-McLain.

14Domestic cold water supply

When the water supply pressure is higher than

70PSIG, install a pressure-reducing valve on the cold water supply line to prevent leakage from the T & P relief valve. A thermal expansion tank is also required.

15Domestic mixed-temperature water supply to system (when used — requires mixing valve)

16Domestic high-temperature hot water supply to system

17Heat trap loops (12” minimum) —

18Isolation valves

19Thermal expansion tank —

•REQUIRED if cold water line is equipped with a backflow preventer or pressure reducing valve — see EXPANSION TANK WARNING on page 6.

20Shock arrester —

Dishwashers, clothes washers, and fast-closing positive shutoff valves incorporated in the system all contrib- ute to creating water shock. Install a water hammer arrester to prevent damage to pipes and appliances. See control manufacturer’s instructions for applica- tion and installation.

21Unions

•Use dielectric unions or couplings to protect hot and cold water fittings from corrosion when connecting dissimilar materials such as copper and galvanized iron pipe.

22Backflow preventer — — — (required for Commonwealth of Massachusetts)

23Vacuum breaker —

24Pressure reducing valve —

•REQUIRED when the supply pressure is higher than 70 PSIG — A thermal expansion tank is also required.

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