Navien NHB Series, Installation & Operation Manual

Page: 39 / 135

39 Installing the System Piping
3.6.4 Wiring Diagram - Zone Pump System with DHW Tank
The NFB Boilers can operate a heating system with up to 2 zones and 1 DHW Tank. The following is the wiring diagram for a zone pump system
with 2 zones and 1 DHW Tank.
Without 24VAC Connections
18/7,6:
)/2:6:
/36:
287'225
'+:7$1.
6<67(0 6833/<
6<67(0 5(7851
5 :
76=21( 76=21( 76=21(
& 5 : & 5 : &
5:
&
76'+:
/:&2
$&9/
$&91
%RLOHU3XPS
=21(3803
=21(3803
=21(3803
/B,1
/B287
/B,1
/B287
/B,1
1&/B287
12/B287
&20/B,1
/B287
%RLOHU6WDWH
%RLOHU(UURU
$+
'+:35,
%RLOHU3XPS
=21(3803
=21(3803
=21(3803
/B,1
/B287
/B,1
/B287
/B,1
1&/B287
12/B287
&20/B,1
/B287
%RLOHU6WDWH
%RLOHU(UURU
$+
'+:35,
5 :
76=21( 76=21( 76=21(
&
5 :
&
5 :
&
5:
&
76'+:
$&9B1
$&9B1
$&9B/
$&9B/
$&9B1
$&9B/
$&9B1
$&9B/
$&
$&
$&
$&
Boiler Pump
DHW Pump
Zone Pump 2
Zone Pump 3
Pump Ground
Thermostat 1 Thermostat 2
DHW Aquastat
(Priority)
Thermostat 3
Use with dry
contacts only
Note
Ɣ
If the DHW Tank is connected to the terminal, the T/S Zone 1 input is not available.
Ɣ
Pumps are connected through dry contact connections.
Ɣ
The rated output of the provided dry contacts are designed to be 5A/120V per each output.