Piping Diagrams - Westinghouse WGR050NG076 Installation Instructions Manual

20
J. PIPING DIAGRAMS
Figure 4 – High Efficiency Water Heater with Recirculation Line and Thermostatic Mixing Valve Piping
NOTES:
1. Minimum pipe size should match unit connection size. Upsize pipe accordingly if greater flow is required.
2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backflow preventer and the cold
water inlet.
3. Gas line must be rated to the unit maximum input capacity. Unit must have 10 feet of pipe after gas regulator.
4. All circulators should have an integral flow check.
5. Drains and check valve between unit and storage tank will assist in purging air from system.
6. This drawing is meant to demonstrate system piping only. The installer is responsible for all equipment and detailing required by local codes. In
Massachusetts, you must install a vacuum relief valve per 248 CMR.
7. Always shut off power to the water heater or isolate the heater from the system if ANY plumbing work is to be done. Running the water heater without
water will result in dry firing.
An ASSE 1017 thermostatic mixing valve MUST be installed when using outdoor reset. Failure to do so could result in substantial
property damage, serious injury, or death.
The piping will not support the weight of the water heater circulator pump. Refer to the pump manufacturer's installation instructions to
properly support the circulator pump. Failure to comply with these instructions could result in substantial property damage, severe
personal injury, or death.
WHL-001 REV. 9.3.14