Navien NCB-190/060H Installation & Operation Manual page 35
Condensing combi-boilers
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Also See for NCB-190/060H:
- User's information manual (31 pages) ,
- Quick installation manual (4 pages)
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3.6.4 System Application - Zone System with Zone Valves (Primary/Secondary Piping)
Not to exceed 4 pipe Dia or Max. 12"
System application drawings are intended to explain the system piping concept only.
Note
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Install a NaviClean filter in the system return to remove foreign objects from the system. Foreign
●
objects inside the system may result in abnormal system operation.
Refer to "3.4 Filling the System" on page 29 for make-up water connections and refer to the
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requirements of your local codes to ensure compliance.
Use a pump with an integral check valve or install a check valve at the pump outlet.
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Refer to "3.7.5 Wiring Diagram - Zone Valve System" on page 45 for wiring connections.
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Additional Zone
Zone Valve
(Typical)
NaviClean
(recommended)
Air Separator
Zone #2
Zone #1
System Pump
Backflow preventer
Pressure reducing valve
Expansion Tank
Installing the System Piping
Make-up Water
35
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Questions and answers
the Navien NCB 250/150 boiler has 3 thermostat circulating terminals I would like to make the zone valve circuit into another thermostat circulating pump would this be possible by using the common and normally open circuit for a thermostat circuit and having bottom terminals to pull a 24 volt relay to pull the l\boiler system pump on?
The Navien NCB-190/060H boiler can control up to three zones using zone valves or zone pumps. The thermostat terminals are designed to interface with zone control components. However, the document does not explicitly state that the thermostat circulating terminals can be used to create a zone valve circuit for another thermostat circulating pump. It is recommended to follow the wiring diagram and zone system configuration guidelines provided in the manual.
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