Navien NR-180 Installation Manual page 41

Navien Gas Water Heater Installation
3.Case III NR, NP + NR-A, NP-A Model Recirculation
Slave n-15 Slave n-14
Hot Cold Gas Hot Cold Gas
"B" "B"
DHW Supply
 It is necessary to install the check valve in "C".
Install check valve in either "A" or "C"

4. Case IV. CH + NR-A, NP-A Model Recirculation
Master
(NR-10PU)
(CH Model)
Space Heating
WATER
PRESSURE
psi
H.S H.R
Primary Loop
Secondary Loop
 Install check valve in the "A" series cold water inlet for cascade system.

When linking with CH series connnect the solenoid valve wire to the external
power wire of CH series.
Slave n-1 Master Unit
Communication Cable
Hot Rec Cold Gas Hot Rec
"C"
Recirculation
.
Slave n-1
NR/NP-(A)
Communication
Cable
Hot Rec Cold Gas Hot
Hot Cold Gas
DHW SUPPLY
Remote Controller
(NR-10DU)
SYMBOL
Union
Ball Valve
Cold Gas
Check Valve
"C"
Faucet
Expansion Tank
Pressure Relief Valve
Gas Supply
"A"
Cold Water Supply
SYMBOL
Slave n-15
Faucet
NR/NP-(A)
Expansion Tank
Pressure Relief Valve
Rec Cold Gas
Circulation Pump
Union
BALL VALVE
CHECK VALVE
S
Solenoid Valve
Air Seperator
GAS SUPPLY
COLD WATER SUPPLY
RECIRCULATION
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