Navien NHW700, Installation Manual

Page: 33 / 83

32 Installing the Water Heater
The following diagram shows the basic operation of an NHW700 Series water heater recirculation system with
the NaviCirc and HotButton.
1 2 3 4
ON
SW1
CE1 CE2
U1
C1
C2
C7
R6
PC1
12 V
5 V
SIGNAL SIGNAL
1
GND
R5
R9
R8
C3 R1 R2
R7 D1
CON3
CON5
CON2
CON1
SIGNAL
2
SENSOR I
RA1
Check Valve
Expansion Tank
City Water Supply Return Water
DHW Supply Temperature Sensor**
NaviCirc*
Push Button
Contact Signal
Push Button
Contact Signal
Push Button
Contact Signal
Ball Valve
* The NaviCirc recirculation valve and the temperature sensor are not included with the water heater but they are available for
purchase.
** When the optional temperature sensor is installed, it must be insulated. The sensor wire may be extended by up to 100 ft
(30 m) using 22AWG wire.
External Recirculation with HotButton and Dedicated Return Line
1 2 3 4
ON
SW1
CE1 CE2
U1
C1
C2
C7
R6
PC1
12 V
5 V
SIGNAL SIGNAL
1
GND
R5
R9
R8
C3 R1 R2
R7 D1
CON3
CON5
CON2
CON1
SIGNAL
2
SENSOR I
RA1
Return Water
Expansion
Tank
Check
Valve
DHW Supply
Temperature
Sensor*
Wired Push Button* Wired Push Button* Wired Push Button*
HotButton Kit
NHW700-A Water Heater
City
Water
Supply
Ball
Valve
[NHW700-160A/180A/199A]
*The push buttons and the temperature sensor are not included with the water heater but are available for purchase.