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Water heater connections may vary.
Consult appliance owner's manual for
actual connection locations.
SRS
Flushing/Descaling Procedures
1. Follow and understand all safety related information provided
with the tankless water heater as well as the fl ushing system
before starting the fl ushing operation. Wear appropriate safety
apparel including safety glasses and rubber gloves. Inspect all
hoses and electrical cords for any kinks, cuts, etc. that could
result in an electrical shock hazard or fl uid leakage. Replace any
worn or damaged components. Consult appliance instruction
manual for complete fl ushing instructions.
2. Disconnect power to the tankless water heater, following the
instructions provided with the appliance.
3. Drain the water heater following the instructions provided with
the appliance.
4. Close the Cold Water Supply Valve and Water Heater Outlet
Valve, isolating the heat exchanger.
5. Connect a hose (supplied with the system) from the fi tting
labeled "Pump Discharge" on top of the Flushing System to
the Service Valve on the Cold Water Supply side of the water
heater.
6. Connect a hose (supplied with the system) from the fi tting
labeled "Return" on top of the Flushing System to the Service
Valve on the Hot Water outlet side of the water heater.
7. Remove the black threaded cap on top of the system and add
no more than 2 gallons of virgin food grade white vinegar to the
tank. Replace the threaded cap. Make sure the included o-ring
is properly seated in the cap to provide a leak proof seal.
8. Open the Hot and Cold Service Valves to the water heater heat
exchanger.
9. Plug Power Cord from the Flushing System Pump to a properly
grounded electrical receptacle. Never allow the pump to run
without adequate liquid in the tank or possible damage to the
pump may occur.
10. Allow the pump to circulate the vinegar solution for at least 45
minutes or per the appliance manufacturer's recommendation
(consult appliance instruction manual). Monitor the system for
leaks or any peculiar behavior. Unplug the power cord if the
pump stops, an external leak develops, or the fl ow is greatly
reduced.
Typical Installation
SCALE
REMOVAL
SYSTEM
© Copyright 2010 Zoeller Co. All rights reserved.
11. After the required time expires, unplug the power cord from the
receptacle.
12. Close the Service Valve on the Cold Water Supply line and
disconnect the hose end from the Service Valve.
13. Disconnect the hose end from the Flushing System "Return"
Line Connection and route it to a suitable drain or to a bucket.
Connect an extra length of hose if necessary.
14. Open the Cold Water Supply Valve to fl ush the water heater with
fresh water, rinsing out the cleaning solution. Let the system
fl ush for 5 minutes or as required per the appliance instructions.
Monitor the discharge from the hose. If using a bucket, empty
as needed.
15. After the required time expires, close the Hot Water Service
Valve and disconnect the hose.
16. Open the Hot Water Supply Valve.
17. Restore power to the heater system and return it to service.
After completing the fl ushing operation:
1. Discard the contents of the Flushing System by removing the
threaded cap from one of the tank access connections on the top
or side of the tank. Pour the contents into a suitable drain.
2. Remove the Return fi tting from the top of the tank to access
the strainer assembly. The strainer element is connected to
the fi tting with a hose clamp. Loosen the clamp to remove the
strainer. Discard the contents of the strainer and rinse away
any remaining particles. Inspect the strainer for any tears or
damage. Replace the strainer as needed. Order P/N 150786.
Re-assemble the strainer to the fi tting assembly and tighten
clamp.
3. Replace the fi tting assembly into the cover of the tank.
4. Add approximately one gallon of fresh water to the tank.
Connect a hose to the Pump Discharge connection and route to
a suitable drain. Plug in the pump to fl ush the vinegar solution
out of the pump. Pour any remaining liquid from the tank and
replace threaded caps.
5. Store the pump system in an appropriate location to prevent
damage by impact and temperature extremes.
SK2793
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