
lp-673 Rev. 000 Rel. 001 Date 8.30.18
18
COLD WATER INLET
HOT WATER OUTLET
COLD WATER INLET
USED IF SENSOR CANNOT
NOTES:
1. Minimum pipe size should match 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. All circulators should have an integral flow check.
4. Drains and shutoff valve between water heater and piping 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.
6. In Massachusetts, you must install a vacuum relief valve per 248 CMR.
7. Mixing valve application is optional, but recommended to help prevent scalding.
8. 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.
9. The setpoint of the water heater needs to be at least 20
o
F higher than the setpoint of the Aquastat / Tank Sensor / System Pipe Sensor.
NOTE:
The preferred installation requires that an Aquastat or Tank Sensor be installed in a sensor well provided on the storage tank.
If a sensor well is not available, a System Pipe Sensor may be installed on the return piping near the storage tank. However, when using a System Pipe Sensor,
the pump MUST be wired to run continuously. In this configuration, this pump CANNOT BE POWERED BY THE WATER HEATER.
NOTE:
Pumps must either be installed indoors or be rated for outdoor installations. This statement does not apply to floor mount models with built-in pumps.
Figure 10 - Water Heater with Storage Tank - NOTE: Floor Models are supplied with a Built-In Pump
COLD WATER INLET
HOT WATER OUTLET
USED IF SENSOR CANNOT
COLD WATER INLET
HEATER PUMP
WITH INTERNAL CHECK