Installation Sheet

26
Youcanchoosefromtwopre-heatingmodes:
Internal Recirculation Mode or External Recirculation Mode. To select a recirculation mode, you must set the ‘Installer Mode’ on the
front control panel.(Refer to the page 33 )
When you use a recirculation mode, there will be some minor efciency loss, as a result of the water heater maintaining a steady
temperature within the recirculation loop.
With the recirculation operation, hot water will be automatically circulated in the hot water pipes. Even with this function activated,
it may take several minutes for hot water to be completely circulated through the plumbing system. Set the timer to activate the
recirculation system prior to the rst use of hot water to ensure hot water is available.
Plumbing Guidelines
Chapter4.–Installation
Cold W at er 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
Condensate Hose
Gas
4-6. Plumbing Applications
1.StandardMode
1.OnlyPOTABLEwatermaybeplumbed
throughthewaterheater.
2.Thewaterheatercannotbeusedforspace
heatingapplications.
3.Expansiontankisrequiredifabackflow
preventerisinstalled.
4.NoritzrecommendstheuseofanIsolation
valvekitwiththeinstallation.
5.Thiskitincludesanintegratedshut-offand
servicevalvewithunionsandapressurerelief
valve.
Backow Preventer
(optional)
Mode Description
Return
Line
Inst. Mode Setting
Hot
Water
Speed
Energy
Default
(Recirculation
Time)
Recirculation
Setting
Recirculation
Mode
Standard (Default)
- page 26
Same as other
Tankless water heater
N/A OFF N/A Good Best -
Internal Recirculation
- page 28
Similar to tank water heater
without recirculation system
N/A ON Internal Better Better
5:00 ~ 8:00 AM
5:00 ~ 11:00 PM
External Recirculation
- page 27
Quicker hot water Required ON External Best Good
Select Water Heater Mode
Recirculation timer setting can be changed by customer's own desire time.
Auto (self learning mode) function can be selected by customer's need.
Please refer to page 22 from owner's guide for more detailed information for timer setting and auto function.