Rinnai Water Heater REU-V2520FFUD - Manual (Page 34)

Rinnai
Water Heater
103 International Drive
Peachtree City, Georgia 30269
RINNAI WATER HEATERS
Domestic Hot Water - Scale Flush Procedure
1 Rinnai Water Heater
This is not an engineered drawing, it is intended only as a guide and
not as a replacement for professionally engineered project drawings.
This drawing is not intended to describe a complete system, it is up
to the contractor/engineer to determine the necessary components
for and configuration of the particular system being installed. The
drawing does not imply compliance with local building code
requirements. It is the engineer/contractor responsiblity to ensure
the installation is in accordance with all local building codes. Confer
with local building officials before installation.
Pressure Relief Valve
3/4" Ball Valve
3/4" Union
Check Valve
S
Pressure Regulator
Circulating Pump
Solenoid Valve
Boiler Drain Valve
KEY
Gas Supply
RINNAI Water Heater Flush Procedure
1. Disconnect power to the Rinnai Water Heaters.
2. Close valves V3 and V4.
3. Connect pump outlet hose H1 to service valve V2.
4. Connect drain hose H3 to valve V1.
5. Pour approximately 4 gallons of virgin, food grade,
white vinegar (or virgin, food grade, citric acid) into pail.
6. Place free ends of hose H2 and H3 into pail.
7. Open valves V1 and V2.
8. Turn on power to circulating pump and allow solution
to circulate through water heater for 45 minutes.
9. Turn off power to circulating pump.
10. Remove free end of hose H3 from pail.
11. Close valve V2 and open valve V4, only.
Do NOT open valve V3 at this time.
12. Allow water to flow out of hose H3 for 5 minutes,
rinsing cleaning solution from water heater.
13. Close valve V1 and open valve V3.
14. Disconnect hoses H1 and H3 from service valves.
15. Remove in-line filter from water heater cold water inlet
and clean out any residue. Place filter back into unit.
16. Restore power to water heater.
V1
V3
V2
V4
H1
H2
H3
Circulating Pump
5 gallon pail of virgin, food
grade, white vinegar (or virgin,
food grade, citric acid).
Cold Water Line
Hot Water Line
n-line
Filter
I

Rinnai America FF Models
I N S TA L L E R ’ S I N S TA L L AT I O N I N S T R U C T I O N S
RECOMMENDED SCALE FLUSH PROCEDURE