FM2748
1019
Supersedes
0617
© Copyright 2019 Zoeller
®
Co. All rights reserved.
Flushing/Descaling Procedures
1. Follow and understand all safety related information provided with the tankless
water heater as well as the flushing system before starting the flushing
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 fluid leakage. Replace
any worn or damaged components. Consult appliance instruction manual
for complete flushing 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 fitting 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 fitting 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
flow is greatly reduced.
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 flush the water heater with fresh water,
rinsing out the cleaning solution. Let the system flush 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 flushing 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 fitting from the top of the tank to access the strainer
assembly. The strainer element is connected to the fitting 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 fitting assembly and tighten clamp.
3. Replace the fitting 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 flush 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.
TANKLESS
WATER
HEATER
HOT WATER SERVICE VALVE
120 V OUTLET
RETURN LINE
PUMP
POWER
CORD
TANK ACCESS
CONNECTIONS
STRAINER
ELEMENT
PUMP
SCALE REMOVAL SYSTEM
HANDLE
PUMP DISCHARGE LINE
HOT WATER OUT
COLD WATER IN
COLD WATER
SUPPLY VALVE
COLD WATER
SERVICE VALVE
WATER HEATER
OUTLET VALVE
SK2793
Water heater connections may vary. Consult appliance
owner's manual for actual connection locations.
SRS
SCALE
REMOVAL
SYSTEM
®
INSTALLATION INSTRUCTIONS
PREINSTALLATION CHECKLIST
Product information presented
here reflects conditions at time
of publication. Consult factory
regarding discrepancies or
inconsistencies.
MAIL TO
: P.O. BOX 16347 • Louisville, KY 40256-0347
SHIP TO
: 3649 Cane Run Road • Louisville, KY 40211-1961
TEL
: (502) 778-2731 • 1 (800) 928-PUMP •
FAX
: (502) 774-3624
Visit our website:
zoellerpumps.com
P/N 152644
Register your
Zoeller Pump Company
Product on our website:
http://reg.zoellerpumps.com/
Patent No.
9,228,575
