Navien NHB Series User Manual

40 Installing the System Piping
With 24VAC Connections
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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
The C terminals are for optional connections with 24 V thermostat COMMON.
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