Gas Water Heater Installation
40
2. Case II : NR, NP MODEL Recirculation
Install Check valve in either
“A” or “B”.
Navien recommends to use "A" Series for recirculation.
Because NR/NP models don't have circulation pumps inside, external pump
shall be installed to use recirculation function, additional pump could be
installed out of the unit. In this case be sure to set the head pressure and
flowrate of the pump properly to enable each unit's flowrate to be more than 2
GPM.
Hot
Cold
Gas
Remote Controller
(NR-10DU)
Cold Water Supply
Gas Supply
Hot
Cold
Gas
Hot
Cold
Gas
DHW Supply
Communication Cable
Master
Slave n-1
Slave n-15
"A"
"B"
"B"
"B"
Aquastat
SYMBOL
BALL VALVE
CHECK VALVE
Pressure Relief Valve
Expansion Tank
Union
Faucet
Circulation Pump
