Flushing The Water Heater - Noritz NRCP1112-DV Owner's Manual

Chapter 4. – Maintenance

3. Flushing the Water Heater

- Flushing the Water Heater
Flushing the Heat Exchanger of water heater is a complicated
procedure. Refer to the following instructions carefully before
attempting the procedure. If you do not understand the procedure,
contact an authorized technician or licensed professional. Keep
in mind that improper maintenance will void your warranty.
1. Disconnect electric power to the water heater.
2. Close the shutoff valves on both hot water outlet and cold
water inlet lines. (V1 & V2)
3. Connect one hose "D1" to the valve "V3" and place the free
end in the bucket. Connect one of the hoses "D3" to the
circulation pump outlet and the cold water inlet line at the
valve "V4". Connect other hose "D2" to the circulation pump
inlet and place the free end in the bucket.
V3
D1
D2
4. Pour the cleaning solution into the bucket.
Place the drain hose (D1) and the hose (D2) into the cleaning
solution.
5. Open service valves (V3 & V4) on the hot water outlet and
cold water inlet lines.
6. Supply inlet water through the water heater for at least 1 hour
at a rate of 4 gallons per minute.
7. Rinse the cleaning solution from the water heater as follows:
- Remove the free end of the drain hose (D1) from the bucket.
- Close service valve, (V4), and open shutoff valve, (V2). Do
not open shutoff valve, (V1).
- Allow water to flow through the water heater for 5 minutes.
- Close shutoff valve (V2).
V3
V4
V2
V1
D3
V2
V4
V1
8. Disconnect all hoses.
9. Remove the cold water inlet filter from the water heater and
clean out any residues.
10. Reinsert the filter and ensure the filter cap is securely
tightened.
11. Connect electrical power to the water heater.
Maintenance procedures [Annually]
- Check piping. (gas and water)
Visually inspect for leaks around internal water piping. Also
inspect external water piping, circulators, pressure relief valve
and fittings. Immediately call a qualified service technician to
repair any leaks.
Leaks must be fixed by a qualified service technician immediately.
Failure to comply with this instruction could result in severe
personal injury, death or substantial property damage.
- Check for operation of the pressure relief valve
WARNING
Leaks must be fixed by a qualified service technician
immediately. Failure to comply with this instruction could
result in severe personal injury, death or substantial property
damage. This discharge line must be installed by a qualified
heating installer or a service technician.
Before proceeding, verify that pressure relief valve outlet has
been piped to a safe place of discharge, avoiding any possibility
of scalding from hot water. If water flows freely, release the lever
and allow the valve to seat. Watch the end of the pressure relief
valve discharge pipe to ensure that the valve does not weep
after the line has had time to drain. If the valve weeps, lift the
seat again to attempt to clean the valve. If the valve continues
to weep, contact your qualified service technician for inspecting
the valve and system. If water does not flow from the valve
even though you have lifted the lever completely, the valve or
discharge line may be blocked. Shut down the Water Heater
immediately. Call your qualified service technician to inspect the
water heater and system.
- Check burner state
You can clean the exterior of burner. However, if you need
to clean the inside of the burner, you should call an qualified
service technician.
Maintaining the Water Heater
37