LP-454 Rev. 004 Rel. 002 Date 12.1.17
15
H. Applications
Figure 5 - Reverse Manifold Piping
NOTES:
1. Minimum pipe size should match connection size. Upsize pipe
accordingly if greater ow is required.
2. A thermal expansion tank suitable for potable water must
be sized and installed within this piping system between the
backow preventer and the cold water inlet.
3. All circulators should have an integral ow check.
4. Drains and check valve between unit and storage tank will assist
in purging air from system.
5. These drawings are 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.
6. Mixing valve application is optional, but recommended to help
prevent scalding.
7. Always shut o 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-ring.
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.
Figure 6 - Piping with Recirculation Line and Thermostatic Mixing Valve
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