Noritz Eco TOUGH NRCP111-DV-LP, Руководство по установке

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Plumbing Guidelines
2. External Recirculation mode
Chapter 4. – Installation
The recirculation pipe must be installed in the field
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.
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 fittings (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.