Noritz NRCP982-DV - Page 29

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How to use Control Panel - User mode
Chapter 3. – Unit Operation
Cold Water Inlet
Expansion Tank (Install
according to local code)
Air & Gas
Mixing
Primary heat
exchanger
Secondary heat
exchanger
Burner
Hot Water Outlet
Pressure Relief Valve
Recirculation
Pump
Reci r cu l at i on Li n e
Condensate Hose
Gas
2. External Recirculation mode
The recirculation pipe must be installed in the eld
in order to apply the ‘External Recirculation Mode’.
This mode allows the water heater recirculation
pipes to be warmed up and serving as the freeze
protection function.
Pressure Relief Valve
Air & Gas
Mixing
Primary heat
exchanger
Secondary heat
exchanger
Burner
Reci r cu l at i on Li n e
Expansion Tank (Install
according to local code)
Recirculation
Pump
Condensate Hose
Gas
Hot Water Outlet
Cold Water Inlet
Internal recirculation mode can be
used even with external recirculation
pipe installed if user wants to save
energy cost.
Must set water heater to internal
recirculation mode.
When using external recirculation mode with
the built-in pump, check the following maximum
recirculation pipe lengths including ttings (3/4"
pipe is recommended):
-1/2" Pipe- 200' (60m) of equivalent length
-3/4" Pipe- 500' (150m) of equivalent length
Lengths in excess of these limits will require an
external recirculation pump.