Hot Water System Design Manual

54 R-TRWH-E-02 Rev D
Flush Procedure Single Unit Flush Procedure 1. Disconnect electrical power to the water heater. 2. Close the shutoff valves on both the hot water
and cold water lines (V3 and V4).
3. Connect pump outlet hose (H1) to the cold water
line at service valve (V2).
4. Connect drain hose (H3) to service valve (V1). 5. Pour 4 gallons of undiluted virgin, food grade,
white vinegar into pail.
6. Place the drain hose (H3) and the hose (H2) to
the pump inlet into the cleaning solution.
7. Open both service valves (V1 and V2) on the hot
water and cold water lines.
8. Operate the pump and allow the cleaning solution
to circulate through the water heater for at least 1 hour at a rate of 4 gallons per minute (15.1 liters per minute).
9. Turn off the pump. 10. Rinse the cleaning solution from the water heater
as follows:
a. Remove the free end of the drain hose (H3)
from the pail. Place in sink or outside to drain.
b. Close service valve, (V2), and open shutoff
valve, (V4). Do not open shutoff valve, (V3).
c. Allow water to flow through the water heater
for 5 minutes.
d. Close shutoff valve (V4). When unit has
finished draining remove the in-line filter at the cold water inlet and clean out any residue. Place filter back into unit and open valve (V4).
e. Close service valve, (V1), and open shutoff
valve, (V3).
11. Disconnect all hoses. 13. Restore electrical power to the water heater.