Navien NaviCirc Installation And Operation Manual
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Navien NaviCirc Installation And Operation Manual

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WARNING
All installations should be done only by a qualified expert and in
accordance with the provided instructions by the manufacturer.
Before starting the installation, please review these installation
and operating instructions carefully. The installation must
comply with national, state, and local plumbing codes and
regulations.
Installation and Operation
Manual
Certified to
NSF / ANSI 372
This device is designed
Note
and optimized for use with
Navien NPE-A/A2/S2 and
NPN Series water heaters
and NCB-H/NFC-H Series
combi boilers.

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Summary of Contents for Navien NaviCirc

  • Page 1 Certified to NSF / ANSI 372 This device is designed Note and optimized for use with Navien NPE-A/A2/S2 and NPN Series water heaters and NCB-H/NFC-H Series combi boilers. WARNING All installations should be done only by a qualified expert and in accordance with the provided instructions by the manufacturer.
  • Page 2 When Installing the NaviCirc: Read these instructions carefully. Failure to comply could ● damage the NaviCirc and also cause potential injury and/or property damage. Check the ratings provided in the instructions and on the ● product to make sure the product is suitable for the application.

  • Page 3: Table Of Contents

    1.4 Configuration 1.5 Supply Connections 1.6 Installing the NaviCirc 1.6.1 Installing the NaviCirc 1.6.2 Leak Check & Air Purge 1.7 Securing the NaviCirc to the Wall 2. Application System 2.1 NPE-A System 2.1.1 Application Guidelines 2.1.2 NPE-A System Diagram 2.2 NPE-A2/S2 System 2.2.1 Setting External Recirculation Mode...
  • Page 4 2.3 NPN System 2.3.1 External Pump Wire Connection 2.3.2 Adjusting the Recirculation Parameters 2.3.3 External Recirculation with NaviCirc 2.3.4 External Recirculation with HotButton (Optional) and NaviCirc 2.4 NCB-H System 2.4.1 Setting the DHW Operation 2.4.2 Setting External Recirculation 2.4.3 Examples of Electrical Connections 2.4.4 External Recirculation with NaviCirc...

  • Page 5: About The Navicirc

    NaviCirc is a circulation device for standard domestic hot water lines without a recirculation system. It allows domestic hot water lines and domestic cold water lines to connect to the NaviCirc and pre- heat hot water lines by circulating hot and cold water through the NaviCirc.

  • Page 6: Specifications

    1.2 Specifications Refer to the following table for product specifications. Items Specifications Product Name NaviCirc Part Number PFFW-SXX-001 Water Flow Rate Range 0.53 - 1.06 GPM (2.0 - 4.0 LPM) ℉ ℃ Crossover Shutoff Temperature ℉ ℉ ℃ ℃ Water Temperature Range...

  • Page 7: Compatible Products & Pump Requirements

    NPE-A and NPE-A2 models may utilize the built-in pump along with the appropriate piping to create a hot water recirculation loop. If the NaviCirc is used on a non-Navien appliance, consult the manufacturer for compatibility and size the pump with the following head requirements: Pump MAX head approx.

  • Page 8: Configuration

    1.4 Configuration Refer to the following diagram for the NaviCirc layout. Faucet Faucet hot water cold water connection connection Hot water Cold water inlet inlet connection connection...

  • Page 9: Supply Connections

    1.5 Supply Connections Refer to the following table for the NaviCirc supply connection specifications. Front view Side view List Connection Hot Water Outlet PF ½” Cold Water Outlet PF ½” Hot Water Outlet PF ½” Cold Water Outlet PF ½”...

  • Page 10: Installing The Navicirc

    1.6 Installing the NaviCirc Follow the instructions to install the NaviCirc to desired faucet location. Use existing hoses (3/8” x 3/8“ or 1/2” x 1/2“) 3/8” to 1/2” adapters Navien flexible hoses (supplied with kit only) (1/2” x 3/8”) 3/8” to 1/2” adaptor Hot and cold water shut off valve (3/8”)

  • Page 11: Installing The Navicirc

    4. Disconnect the ” (or ”) hose that was originally connected to faucet. 5. Secure the NaviCirc below the faucet in the desired location. ” adaptor to the NaviCirc HOT OUT and 6. Connect the ” to COLD OUT (or the hot and cold shutoff valves depending on the shutoff valve hose size) connections.

  • Page 12: Leak Check & Air Purge

    2. Open hot water and cold water shutoff valves. 3. Open hot water and cold water faucets. 4. Check if there are leaks after connecting the hoses to the NaviCirc. In case of leaks, close the shutoff valves and repair Note any leaks.

  • Page 13: Securing The Navicirc To The Wall

    1.7 Securing the NaviCirc to the Wall Follow the instructions to install the NaviCirc to desired faucet location. Secure the NaviCirc with the three anchor bolts included with the installation kit. Do not forcefully secure the NaviCirc to the wall with Note anchor bolts, as this can damage the system.

  • Page 14: Application System

    2. Application System 2.1 NPE-A System 2.1.1 Application Guidelines See the installation guidelines below for additional instructions. 1. Locate the 10-switch set of dipswitches on the front panel and verify that DIP SW2 is ON for EXTERNAL recirculation. 1-OFF 2-ON 2.
  • Page 15 4. In the R&D information menu, use the Up [+] or Down [-] button to move to 2.PAR (Parameter information mode), and then press the Information button. Mode Display Technical information Parameter information 5. Use the Up [+] and Down [-] buttons to enter Parameter #17 (P.17 –...
  • Page 16 6. Use the Up [+] or Down [-] button to move to adjust the parameter option to 2. ON. Range Description Display 1.OFF Thermal bypass valve is disabled. 2. ON Thermal bypass valve is enabled. Setting for S-type models, Panel DIP3 Null ON, Cascade ON, or AHU is enabled.
  • Page 17 Items Description Sets the length of time that the circulator will operate periodically in order to check the temperature of the Return Line recirculation return line and see if it Sampling Time needs to be re-heated. (P.14) Setting range: 1 to 120 ●...

  • Page 18: Npe-A System Diagram

    2.1.2 NPE-A System Diagram Follow the instructions to install the NaviCirc to the wall. Navien NPE A Navien NPE A Water heater Water heater HotButton kit* HotButton kit* Wired Wired Wired Wired push button push button push button push butto...
  • Page 19 400 feet (approx 120 m) equivalent ● length of ¾” copper pipe Flexible Flexible hoses hoses * The HotButton kit is sold separately. NaviCirc NaviCirc ** Solenoid valve not required under Flexible Flexible most conditions. Temperature hoses hoses fluctuations may occur during high system flow rates.
  • Page 20 2.1.2.1 Installing the Solenoid Valve (Optional) A Navien external pump wire (#GXXX001319) is needed to complete the solenoid valve installation. See the installation guidelines below. 1. Make sure that the system power is off before proceeding with the installation of the wiring.
  • Page 21 6. Locate the TB1 connection on the PCB and attach the external pump wire and solenoid valve assembly to this connector. 7. Locate the 10-switch set of dipswitches on the front panel and verify that DIP SW2 is ON for EXTERNAL recirculation. 1-OFF 2-ON 3-OFF...

  • Page 22: Npe-A2/S2 System

    2.2 NPE-A2/S2 System For more information about external recirculation mode and DIP switch settings, refer to the NPE A2/S2 Installation Manual. 2.2.1 Setting External Recirculation Mode To use the external recirculation mode: 1. Connect the water supply to support recirculation. 2.
  • Page 23 3. Press the Menu button ( ) to access the Main menu and select 1. Recirculation Setting > 2. External Recirculation by pressing the OK button ( ).
  • Page 24 If the A2-type model requires an external pump, Note follow the instructions in “2.2.2 External Pump Wire Connection” on page 26 first and select YES on the screen asking whether the external pump is connected to the PCB. Model Step 1 Step 2 Step 3 Always On...
  • Page 25 The following diagram shows the external recirculation flow for pre-heating: Primary Heat Exchanger Buffer Secondary Heat Exchanger Tank Flow Sensor 2-Way Circulation Pump Valve Closed Check Valve Water Adjustment Valve Domestic Water Recirculation Water Supply Water Supply Supply [External Recirculation Mode using the Recirculation Inlet]...

  • Page 26: External Pump Wire Connection

    2.2.2 External Pump Wire Connection An external pump may be connected to the water heater for recirculation applications. When selecting a circulator, it shall be sized to maintain a flow of 2-4 GPM at 15 ft (4.6 m) – 23 ft (7 m) of head through the water heater.
  • Page 27 1. Remove the water heater front cover by loosening the 4 Phillips head screws securing it to the case. 2. Locate the power switch on the right side of the front panel and switch the system off. Turn the switch off.
  • Page 28 3. Remove the 2 screws holding the PCB box in place and remove the PCB box from the system. Remove Screws here. 4. Connect the external pump wiring connector to the connector socket on the PCB (TB1). 5. Put the PCB box back in its original place and secure it using the 2 mounting screws.
  • Page 29 6. Remove the plastic insulation from the external pump wire with a wire stripper before connecting it to the pump. 7. Connect the external pump wire to the proper wires from the pump junction box. WARNING ONLY turn on the water heater after connecting the wire to the external pump to prevent serious injury or death from electric shock.
  • Page 30 9. Put the water heater cover back on and secure it with the 4 screws. You can configure it as either Type 1 or Type 2 if you install an external recirculation line. Condensate Domestic Hot Water Domestic Cold Water Domestic Recirculation Return [Type 1.
  • Page 31 Condensate Domestic Cold Water Domestic Hot Water Domestic Recirculation Return [Type 2. Recirculation Using a Second Pump (NPE-A2 Models, Navien Internal Pump & External Pump)]...

  • Page 32: Navien Hotbutton Kit (Optional)

    2.2.3 Navien HotButton Kit (Optional) The NPE-A2/S2 series water heaters have a built-in Navien HotButton controller (the push button, wall plate, and temperature sensor have to be purchased separately). It adds signal input functions to the NPE-A2/S2 series water heaters for more efficient DHW hot water recirculation functionality.
  • Page 33 Items Not Included Push Button Switch Wall Plate Temperature Sensor (#GXXX001426) (#GXXX001427) (#GXXX001640) In addition to activating the HotButton using push Note buttons, recirculation can also be started through the NaviLink app if the optional NaviLink WiFi control system has been installed. Device Layout Refer to the following diagram for the product layout.
  • Page 34 Wiring Connection Table Terminal Wiring Connection 12 V Signal Contacts for wireless push button or motion Signal1 sensor connection Signal2 Push Button Switch Contact #1 (Not polarity Push Button Switch Contact #2 sensitive) Sensor I Contacts for temperature sensor connection Connecting Wired Switches Refer to the following diagrams to connect a wired switch, or multiple wired switches to the HotButton controller.
  • Page 35 When you connect the push button switches to the controller, you can run cables from each switch directly to the controller and connect them to the same terminal. Or, you can run a common branch circuit that runs from the controller and connect each switch to the branch.
  • Page 36 Make sure that the total cable length does not exceed ● 328 feet (100 meters). Additional push button switches (#GXXX001426) and ● wall plates (#GXXX001427) can be purchased through Navien. HotButton DIP Switch Information DIP SW Enable the HotButton. Disable the HotButton. Enable the energy saver Disable the energy saver function.

  • Page 37: System Application - External Recirculation

    2.2.4 System Application – External Recirculation The following diagram shows the recirculation system's basic operation of an NPE-A2/S2 series water heater system with the Navien NaviCirc and Navien HotButton kit with or without a dedicated return line. The NPE-A2/S2 series water heaters have a built-in Note ●...
  • Page 38 External Recirculation with HotButton (Optional) and NaviCirc NPE-A2 Water Heater Wired Push Button* HotButton Kit* Ball Valve DHW Supply Expansion Tank City Water Supply [NPE-180A2/210A2/240A2] Set the 2-way valve inside the water heater to the Note ● "Ext" position when using the NaviCirc recirculation valve.
  • Page 39 Wired Push Button* Wired Push Button* Flexible Hoses NaviCirc Temperature Flexible Hoses Sensor* Return Water...
  • Page 40 NPE-S2 Water Heater HotButton Wired Push Button* Kit* Ball Ball Valve Valve External Pump DHW Supply Expansion Tank City Water Supply [NPE-150S2/180S2/210S2/240S2] * The HotButton kit, push buttons, and the temperature sensor are not included with the water heater but are available for purchase.
  • Page 41 Wired Push Button* Wired Push Button* NaviCirc Temperature Sensor* Return Water...

  • Page 42: Npn System

    2.3 NPN System For more information about external recirculation mode and DIP switch settings, refer to the NPN Installation Manual. 2.3.1 External Pump Wire Connection An external pump may be connected to the water heater for recirculation applications. When selecting a circulator, it shall be sized to maintain a flow of 2-4 GPM through the water heater.
  • Page 43 <External Pump Wire (GXXX001319) Specifications> Maximum Power Consumption: 150W, 1.5A ● Length: 6 ft (183 cm) ● When using a pump with larger power requirements Note than the listed specification above, a relay should be used to ensure proper operation. 1.
  • Page 44 3. Remove the 2 screws holding the PCB box in place and remove the PCB box from the system. Remove Screws here. 4. Connect the external pump wiring connector to the connector socket on the PCB (TB1). 5. Put the PCB box back in its original place and secure it using the 2 mounting screws.
  • Page 45 6. Remove the plastic insulation from the external pump wire with a wire stripper before connecting it to the pump. 7. Connect the External Pump Wire to the proper wires from the pump junction box. WARNING ONLY turn on the water heater after connecting the wire to the external pump to prevent serious injury or death from electric shock.
  • Page 46 8. Locate the 10-switch DIP (SW1) on the front panel and turn on the proper switches based on the desired recirculation setting (see Recirculation Dipswitch Settings below). [NPN-160U/180U/199U] [NPN-120E/160E/180E/199E]...
  • Page 47 9. Turn on the switch beside the front panel. 10. Put the water heater cover back on and secure it with the 4 screws. Domestic Domestic Cold Water Hot Water Domestic Recirculation Return [Recirculation Using External Pump Only]...

  • Page 48: Adjusting The Recirculation Parameters

    2.3.2 Adjusting the Recirculation Parameters Entering the R&D Information Menu Follow the instructions below to enter the R&D information menu. 1. On the Front panel, press the Power button to turn off the water heater. 2. Enter the R&D information menu by pressing the Up (+) button three times, the Down (-) button three times, and then the Up (+) button four more times.
  • Page 49 4. To return to the previous menu (R&D information menu), press the [Reset] button once. Items Name Description Display Pump Set the maximum time for 12. P12 Cycle pump operation or on- Interval demand operation. Pump Set the pump cycle ON 14.

  • Page 50: External Recirculation With Navicirc

    2.3.3 External Recirculation with NaviCirc The following diagram shows the basic operation of an NPN Series water heater recirculation system with the NaviCirc. Install the NaviCirc to the faucet farthest from the water Note heater. If installed in close proximity to the water heater, faucet pipes far away may not be properly heated.
  • Page 51 * The external pump NaviCirc connector is not included with the water heater but it is available for purchase. For more information about connecting the external pump to the water heater, refer to Return Water “2.5.1 External Pump Wire Connection” on page 42.

  • Page 52: External Recirculation With Hotbutton (Optional) And Navicirc

    2.3.4 External Recirculation with HotButton (Optional) and NaviCirc The following diagram shows the basic operation of an NPN Series water heater recirculation system with the NaviCirc and HotButton. Push button HotButton contact signal Kit* Ball Valve External Pump Check Connector*...
  • Page 53 For more information about connecting the external pump to the water heater, refer to “2.5.1 External NaviCirc Pump Wire Connection” on page 42. ** When the optional temperature sensor Temperature Sensor** is installed, it must be insulated.

  • Page 54: Ncb-H System

    2.4 NCB-H System For more information about external recirculation mode and DIP switch settings, refer to the NCB-H Installation & Operation Manual. 2.4.1 Setting the DHW Operation To set the boiler’s DHW operation, press the Menu button ( and then select “3. DHW Operation”. Rotate the Command dial ( ) to switch between the list items or to increase/decrease setting values.
  • Page 55 Item Description When only one NCB-H boiler is connected: Set the Recirculation type and Schedule settings. Recirculation type ● - No Recirculation - Combi Pre-Heat - External External recirculation cannot be used Note for cascade systems. Recirculation type settings (Combi Pre-heat/ External) Set to Combi Pre-heat (Default: Always On) ●...

  • Page 56: Setting External Recirculation

    2.4.2 Setting External Recirculation When using the External Recirculation feature, you can choose commands in the menu to preheat according to the set DHW temperature. Item Description 1. Always On Set to repeat DHW Recirculation. Set to detect DHW use for a week and repeat the 2.

  • Page 57: Examples Of Electrical Connections

    2.4.3 Examples of Electrical Connections WARNING Electric Shock Hazard To prevent serious injury or death: ALWAYS follow all applicable electrical codes of the local ● authority having jurisdiction. In the absence of such requirements, follow the latest ● edition of the National Electrical Code (NFPA 70) in the USA or the latest edition of CSA C22.1 Canadian Electrical Code Part 1 in Canada.
  • Page 58 2.4.3.1 Accessing the NCB-H Terminal Strips DANGER Electric Shock Hazard To prevent serious injury or death: You must ensure that the boiler is disconnected from the electrical supply before carrying out any servicing inside the boiler and, particularly, on the electric terminal strips. To access the PCB, carefully follow the steps below: 1.
  • Page 59 2.4.3.2 Wiring Diagram - External LWCO LWCO Line lLWCO AC24VL AC24VN Line T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 LWCO Neutral The boiler supplies 24 VAC at the LWCO power terminals Note (CNC3). For terminal type LWCO appliances, a typical wiring method is shown below (same voltage for control and burner circuit): LWCO Terminals Jumper...
  • Page 60 2.4.3.3 Wiring Diagram - Zone Pump System NCB-H boilers can operate a heating system with up to 3 zones. The following is the wiring diagram for a zone pump system with 3 zones. Zone Pump Dry Contact Connections (no 24VAC power) and Thermostats without 24VAC power Neutral Neutral...
  • Page 61 Note If you have a 24 V thermostat, ● connect it to the R & C terminals on the boiler’s PCB. The C terminals are for ● optional connections with 24 V thermostats that have a COMMON wire. OUTDOOR RETURN OUTDOOR T/S_ZONE3 T/S_ZONE3...

  • Page 62: External Recirculation With Navicirc

    2.4.4 External Recirculation with NaviCirc The following pump models are recommended for use with the NCB-H boiler and DHW recirculation systems. When using the indicated pump models, observe the following maximum recirculation pipe lengths: 100 feet (30 m) equivalent length of ”...
  • Page 63 Recirculation Pump Neutral (max. 2.5 A) Line lLWCO lLWCO AC24VL AC24VL AC24VN AC24VN SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 TEMPERATURE SENSOR TEMPERATURE SENSOR * Recirculation Pump NaviCirc DHW Supply Return Water Expansion Tank...
  • Page 64 Pipe Diameter " " Maximum Pipe Length 100 ft (30 m) 400 ft (120 m) Install the NaviCirc recirculation valve on the faucet Note ● furthest from the NCB-H boiler. If installed in close proximity to the boiler, faucets ●...

  • Page 65: External Recirculation With Hotbutton (Optional) And Navicirc

    2.4.5 External Recirculation with HotButton (Optional) and NaviCirc External Recirculation Mode For best performance, select the manual option in the External recirculation DHW recirculation mode. Combi pre-heat is the default mode for DHW Note ● recirculation. To select external recirculation, refer to the combi pre-heat and external recirculation sections in ”2.3.1 Setting the DHW Operation”...
  • Page 66 Recirculation Pump (max. 2.5 A) Neutral Line SUPPLY SUPPLY RETURN RETURN OUTDOOR OUTDOOR T/S_ZONE3 T/S_ZONE3 T/S_ZONE TEMPERATURE SENSOR TEMPERATURE SENSOR * Recirculation Pump Check Valve Return Water City Water Supply Expansion Tank...
  • Page 67 AC24VL AC24VL AC24VN AC24VN Wired HotButton lLWCO lLWCO AC24VL AC24VL AC24VN AC24VN SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 TEMPERATURE SENSOR TEMPERATURE SENSOR T/S_ZONE2 T/S_ZONE1 T/S_ZONE1 Wired HotButton Wired HotButton NaviCirc DHW Supply...
  • Page 68 400 ft (120 m) To use HotButton mode, install a HotButton and Note ● recirculation pump. Install the NaviCirc recirculation valve to the faucet ● furthest from the NCB-H boiler. If installed in close proximity to the boiler, faucets ●...

  • Page 69: Nfc-H System

    2.5 NFC-H System For more information about external recirculation mode and DIP switch settings, refer to the NFC-H Installation & Operation Manual. 2.5.1 Setting the DHW Operation To set the boiler’s DHW operation, press the Menu button ( and then select “3. DHW Operation”. Rotate the Command dial ( ) to switch between the list items or to increase/decrease setting values.
  • Page 70 Item Description When only one NFC-H boiler is connected: Set the Recirculation type and Schedule settings. Recirculation type ● - No Recirculation - Combi Pre-Heat - External External recirculation cannot be used Note for cascade systems. Recirculation type settings (Combi Pre-heat/ External) Set to Combi Pre-heat (Default: Always On) ●...

  • Page 71: Setting External Recirculation

    2.5.2 Setting External Recirculation External Recirculation When using the External Recirculation feature, you can choose commands in the menu to preheat according to the set DHW temperature. Item Description 1. Always On Set to repeat DHW Recirculation. Set to detect DHW use for a week and repeat the 2.

  • Page 72: Examples Of Electrical Connections

    2.5.3 Examples of Electrical Connections WARNING Electric Shock Hazard To prevent serious injury or death: ALWAYS follow all applicable electrical codes of the local ● authority having jurisdiction. In the absence of such requirements, follow the latest ● edition of the National Electrical Code (NFPA 70) in the USA or the latest edition of CSA C22.1 Canadian Electrical Code Part 1 in Canada.
  • Page 73 2.5.3.1 Accessing the NFC-H Terminal Strips DANGER Electric Shock Hazard To prevent serious injury or death: You must ensure that the boiler is disconnected from the electrical supply before carrying out any servicing inside the boiler and, particularly, on the electric terminal strips. To access the PCB, carefully follow the steps below: 1.
  • Page 74 2.5.3.2 Wiring Diagram - External LWCO LWCO Live lLWCO AC24VL AC24VN Live T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 LWCO Neutral The boiler supplies 24 VAC at the LWCO power terminals Note (CNC3).
  • Page 75 For terminal type LWCO appliances, a typical wiring method is shown below (same voltage for control and burner circuit): LWCO Terminals Jumper Neutral Live LWCO To Boiler LWCO Terminals 2.5.3.3 Wiring Diagram - Zone Pump System with Recirculation NFC-H boilers can use both the 3 zone heating system and the DHW recirculation feature.
  • Page 76 Without 24VAC Connections Neutral Live Recirculation pump Recirculation pump (max. 2.5 A) (max. 2.5 A) Neutral lLWCO lLWCO AC24VL AC24VL Live AC24VN AC24VN SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 SUPPLY T/S_ZONE1 RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 Zone pump 1 Zone pump 1 TEMPERATURE SENSOR TEMPERATURE SENSOR SUPPLY...
  • Page 77 * If the DHW recirculation menu is set to the Always On, Intelligent, or Weekly option, no aquastat or additional HotButton is required. Note The C terminals are for ● optional connections with 24 V thermostat COMMON. When using combi pre- ●...
  • Page 78 With 24VAC Connections Neutral Live Recirculation pump Recirculation pump (max. 2.5 A) (max. 2.5 A) Neutral lLWCO lLWCO AC24VL AC24VL Live AC24VN AC24VN SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 SUPPLY T/S_ZONE1 RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 Zone pump 1 Zone pump 1 TEMPERATURE SENSOR TEMPERATURE SENSOR SUPPLY...
  • Page 79 * If the DHW recirculation menu is set to the Always On, Intelligent, or Weekly option, no aquastat or additional HotButton is required. Note When using combi pre- ● heat, using a recirculation pump is not necessary. Select combi pre-heat on the DHW recirculation menu.

  • Page 80: External Recirculation With Navicirc

    2.5.4 External Recirculation with NaviCirc The following pump models are recommended for use with the NFC-H boiler and DHW recirculation systems. When using the indicated pump models, observe the following maximum recirculation pipe lengths: 100 feet (30 m) equivalent length of ”...
  • Page 81 Pump (max. 2.5 A) Neutral Neutral Live Live lLWCO lLWCO AC24VL AC24VL AC24VN AC24VN SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 TEMPERATURE SENSOR TEMPERATURE SENSOR Pump Ground * Recirculation Pump NaviCirc DHW Supply Return Water...
  • Page 82 Pipe Diameter " " Maximum Pipe Length 100 ft (30 m) 400 ft (120 m) Install the NaviCirc recirculation valve on the faucet Note ● furthest from the NFC-H boiler. If installed in close proximity to the boiler, faucets ●...

  • Page 83: External Recirculation With Hotbutton (Optional) And Navicirc

    2.5.5 External Recirculation with HotButton (Optional) and NaviCirc External Recirculation Mode For best performance, select the manual option in the External recirculation DHW recirculation mode. Combi pre-heat is the default mode for DHW Note recirculation. To select external recirculation, refer to the combi pre-heat and external recirculation sections in ”2.4.1 Setting the DHW Operation”...
  • Page 84 Recirculation Pump (max. 2.5 A) Neutral Neutral Live Live lLWCO AC24VL AC24VN SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 SUPPLY RETURN OUTDOOR T/S_ZONE3 T/S_ZONE2 T/S_ZONE1 TEMPERATURE SENSOR TEMPERATURE SENSOR SUPPLY SUPPLY RETURN RETURN OUTDOOR OUTDOOR T/S_ZONE3 T/S_ZONE3 T/S_ZONE2 T/S_ZONE2 T/S_ZONE1 T/S_Z TEMPERATURE SENSOR TEMPERATURE SENSOR Pump...
  • Page 85 Wired Note HotButton NaviCirc To use HotButton mode, ● install a HotButton and recirculation pump. Install the NaviCirc ● recirculation valve to the faucet furthest from the NFC-H boiler. If installed in close ● proximity to the boiler, faucets further down the supply line will take longer to receive hot water.

  • Page 86: Troubleshooting

    3. Troubleshooting If you experience a problem with the NaviCirc, refer to the following table for possible remedies. Problem Possible cause(s) Full temperature water has not ● reached the fixture. The hot water temperature of the ● water heater is set too low.
  • Page 87 ● Check whether the pump is stuck. ● If NaviCirc is used on a non-Navien appliance, check that the pump is ● properly sized and installed per the manufacturer's instructions. Clean out the water heater filter and the NaviCirc inlet.
  • Page 88 The date of original installation must be provided to Navien, and upon request, proof of the original installation date must also be provided to Navien. When the product is installed in a new construction, the commencement date shall be dated upon which the end-user takes title to the property.
  • Page 89 Payment for labor in completing the warranty service is subject to Navien’s prior written approval and shall be subject to Navien’s schedule of approved labor allowances.
  • Page 90 MEMO...
  • Page 91 MEMO...
  • Page 92 Installation and Operation Manual Navien, Inc. 20 Goodyear lrvine, CA 92618 TEL 1-800-519-8794 FAX 1-949-420-0430 www.navieninc.com...

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