Navien Gas Water Heater Installation
39
CAUTION
This drawing can be a useful guideline when installing a unit. However, installation
may vary depending on the location circumstances, local building codes or state
regulation. Make sure to check the local building codes and state regulation before
installation, and comly with it.
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Cascade Connection and Set-up Procedures:
Step 1: Plumbing
The Water Heater unit can be connected with other units up to 16 units for user
’s purpose.
1. Case I : NR-A, NP-A Recirculation
In the status that recirculation piping connected to cascade piping are open,
activate internal pump. If flow rate per a unit does not reach to 2 GPM, please
check flow rate as closing ball v/vs at recirculation enterance one by one.
At this time, please set the unit whose ball v/v is closed as internal circulation.
CASCADE CO
NNE
CTION AND S
ET
-UP
PROCEDURES
DHW Supply
Cold Water Supply
Gas Supply
Hot
Cold
Rec
Gas
Remote Controller
(NR-10DU)
Recirculation
Hot
Cold
Rec
Gas
Hot
Cold
Rec
Gas
Communication
Cable
Master
Slave n-1
Slave n-15
SYMBOL
BALL VALVE
CHECK VALVE
Pressure Relief Valve
Expansion Tank
Union
Faucet
