Navien NFC-175 Installation & Operation Manual page 42

With 24VAC Connections
Recirculation pump
(max. 2.5 A)
Zone pump 1
(max. 2.5 A)
Zone pump 2
(max. 2.5 A)
Zone pump 3
(max. 2.5 A)
* If the DHW recirculation menu is set to the Always On, Intelligent, or Weekly option, no aquastat or additional HotButton is required.
When using combi pre-heat, using a recirculation pump is not necessary. Select combi pre-heat on the DHW recirculation menu
Note
●
of the parameter setting part.
When using external recirculation, install a recirculation pump and select external recirculation in the DHW recirculation menu.
●
42 Installing the System Piping
lLWCO
AC24VL
AC24VN
SUPPLY RETURN OUTDOOR T/S_ZONE3
TEMPERATURE SENSOR R W C
Pump Ground
SUPPLY RETURN OUTDOOR T/S_ZONE3
TEMPERATURE SENSOR R W C
Thermostat 3
NC
NC
COM
NC
NC
COM
NC
NC
COM
LWCO
AC24VL
AC24VN
lLWCO
AC24VL
AC24VN
*
Recirculation
Timer, Aquastat,
or HotButton
24 VAC N
Thermostat Input
24 VAC L
Thermostat 1
24 VAC N
Thermostat Input
24 VAC L
Thermostat 2