Navien NHB Series User Manual

39Installing 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: /36:
287'225 '+:7$1.




6<67(0
6833/<
6<67(0
5(7851
5:
76=21( 76=21( 76=21(
&
5:
&
5:
&
5:
&
76'+:
/:&2
$&9/
$&91
%RLOHU3XPS
=21(3803 =21(3803 =21(3803
/B,1 /B287/B,1 /B287/B,11&/B287 12/B287 &20/B,1 /B287
%RLOHU6WDWH %RLOHU(UURU$+ '+:35,
%RLOHU3XPS
=21(3803 =21(3803 =21(3803
/B,1 /B287/B,1 /B287/B,11&/B287 12/B287 &20/B,1 /B287
%RLOHU6WDWH %RLOHU(UURU$+ '+:35,
5:
76=21( 76=21( 76=21(
&
5:
&
5:
&
5:
&
76'+:
$&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.

Navien NHB Series Specifications

General

Type	Condensing Boiler
Efficiency	Up to 95% AFUE
Fuel Type	Natural Gas or Propane
Vent Type	Direct Vent
Vent Diameter	2" or 3"
Heat Exchanger Material	Stainless Steel
Water Connections	3/4" NPT
Dimensions	Varies by model
Weight	Varies by model
Warranty	5-Year Parts