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HOT OUTLET
COLD INLET
DRAIN
VALVE
HANDLE
B
HOT VALVE
MAIN
WATER
VALVE
HANDLE
HOT OUTLET
COLD INLET
DRAIN
VALVE
HANDLE
B
HOT VALVE
MAIN
WATER
VALVE
HANDLE
WARNING: Cancer and Reproductive
Harm - www.P65Warnings.ca.gov
CLEANING
DRAIN
VALVE
Flush unit after cleaning
HANDLE
to prevent cleaning
solution from entering
hot water system piping.
MAIN WATER
VALVE HANDLE
A
COLD VALVE
FLUSHING
For flushing, hot main
water valve should remain
closed to prevent cleaning
solution from entering
hot water system piping.
TESTING
For diagnostic testing
with potable water,
hot main water valve
can remain open.
A
COLD VALVE
SERVICING
INSTRUCTIONS
IMPORTANT: Check with the manufacturer of your heating appliance for specific
guidelines and maintenance requirements for the unit installed.
IMPORTANT: For heating appliances with integrated drains, refer to appliance owner's
manual for service procedures.
CLEANING AND FLUSHING
Pump, hoses, pail, and cleaning solution not included.
1. Power down the unit, then close the fuel source isolation valve.
2. Close the Cold
A
and Hot
3. Ensure the Cold
A
and Hot
perpendicular to the drain spout). Slowly remove the drain caps. Retain washer.
4. Connect the pump outlet hose to the Cold
5. Connect a drain hose to the Hot
6. Pour 3 to 5 gallons of flushing/de-scaling solution into a pail (virgin food grade
white vinegar or citric acid recommended - see appliance owner's manual for
specific recommendations for your unit).
7. Place the pump/pump inlet hose and Hot
8. Open Cold
A
and Hot
B
drain valves.
9. Turn on the pump. Allow the solution to circulate for 20 to 45 minutes,
depending on the amount of scale in the appliance.
10. Turn off the pump. Close the Cold
11. Remove the hose from the Cold
Replace cap & washer securely onto the drain valve outlet.
12. Remove the pump and hose from the pail.
Dispose of the cleansing solution safely and properly.
Flushing - This procedure will flush the appliance with fresh cold water.
13. Put the Hot
drain hose end back into the empty pail or place in drain.
B
Open the Cold
main water valve. Flush with at least 20 gallons.
A
You will have to empty the pail several times.
14. Close the Cold
A
main water valve and clean unit in-line filter, if required.
15. Close the Hot
drain valve, remove the drain hose.
B
Replace cap and washer securely onto the drain valve outlet.
16. Open the Cold
and Hot
A
17. Ensure that both the Cold
18. Open fuel source isolation valve, then restore power to the tankless water heater.
Restart the unit per the power up guidelines of the manufacturer.
DIAGNOSTIC TESTING
E-X-P
™
Series service valves allow for full diagnostic testing of the heating appliance
at the unit, eliminating the need for another individual to actuate a remote hot water
fixture. Flow rate, firing rate, and temperature tests can all be performed; consult
appliance owner's manual for complete information on testing your particular model.
1. Ensure the Hot
drain valve handle is closed (perpendicular to the drain spout).
B
Slowly remove the drain cap. Retain washer.
2. Connect a hose to the Hot
and begin testing the system.
3. When testing is complete, close the Hot
Replace cap and washer securely onto the drain valve outlet.
B
main water valves.
B
drain valve handles are closed (handles
A
drain.
B
drain.
B
drain outlet hose into the pail.
drain valve.
A
drain.
A
main water valves.
B
& Hot
drain valve handles are CLOSED.
A
B
drain valve and run into a pail, sink, or drain opening
B
drain valve and remove the drain hose.
B
P: (800) 225-9529
F: (800) 336-5133
www.webstonevalves.com
webstone@nibco.com
HOT OUTLET
COLD
DRAIN
VALVE
HANDLE
B
HOT VALVE
MAIN
WATER
VALVE
HANDLE
HOT OUTLET
COL
DRAIN
VALVE
HANDLE
B
HOT VALVE
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