A.O. Smith 505 Series 100 用户手册

Drawing Number:

Drawing Date:

September 07, 2008

NOTE: This drawing is not intended to describe a complete system and is not a replacement for a pro-
fessional engineering drawing. It is intended only as a guide and does not imply compliance with local 
building code requirements. Confer with local building officials before installation

. The Contractor or 

engineer is to determine the necessary components and configuration of the particular system to be in-
stalled. It is the responsibility of the engineer or contractor to ensure that the installation is in accordance 
with all local building codes.

38

Maintenace - Scale Flush Procedure

1 On-Demand Water Heater

G as S upply

C old W ate r Line

Hot Wa ter Line

In-l n

i e

F ilter

Flush Procedure

1.  Disconnect electrical power to the water heater.

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 approximately 4 gallons of virgin, food grade, white vinegar or citric 

acid 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 45 minutes.

10. Rinse the cleaning solution from the water heater by:

a.  remove the free end of the drain hose (H3) from the pail

11. Disconnect all hoses.

13. Restore electrical power to the water heater.

Key

Pressure Relief  Valve

Check Valve

3/4" Union

3/4" Ball  Valve

Boiler Drain Valve

Solenoid Valve

S

Pressure Regulator

Circulating Pump

Mixing Valve