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FAQ - How do I descale flush the heat exchanger?

Article Number: 48 | Rating: 4.4/5 from 33 votes | Last Updated: Mon, Oct 30, 2017 6:52 PM

Flushing or De-scaling is part of the regular maintenance of a Noritz heater. It involves circulating a solution of pure vinegar or Calcium, Lime, and Rust product through the heat exchanger using a submersible pump. You will need the following equipment to conduct a de-scale:

Bucket
Submersible pump
Isolator valve kit (installed on heater)
Water line connections (the isolator valves have a 3/4" hose thread connections on their flush ports)
Descaling solution (vinegar or Calcium, Lime, Rust product)

For complete step by step instructions, please see the attached instruction manual.

For units that start with the following names below, see attached file "Descale Procedure Group A Zone II”.

• NR501-OD

• NR662-OD

• NRC661A-OD

• NRC661A-DV

• NRC711-OD

• NRC711-DV

• NRC663-FSV (EZTR40)

For units that start with the following names below, see attached file "Descale Procedure Group B Zone III”.

• (GQ-2457….)

• (GQ-2857….)

• (GQ-C2857…)

• (GQ-C3257…)

• (GQ-C2859…)

• (GQ-C3259…)

For units that start with the following names below, see attached file "Descale Procedure NRCB180 NRCB199”.

• NRCB199DV (GHQ-C3201WX-FF US)

• NRCB180DV (GHQ-C2801WX-FF US)

For all other units not listed above, see attached file "Descale Procedure Group C”.

Applicable Models

Models: ALL MODELS

Attachments (4)

descale_procedure_group_c_copy2.pdf ( 14582 Views, 1.94 MB )
descale_procedure_group_a_zone_ii_copy1.pdf ( 7272 Views, 5.02 MB )
descale_procedure_group_b_zone_iii_copy3.pdf ( 4237 Views, 7.21 MB )
descale_procedure_nrcb180_nrcb199.pdf ( 3340 Views, 3.84 MB )

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