Navien NaviCirc User manual

Installation and Operation
Manual
Certified to
NSF / ANSI 372
Note This device is designed
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 qualied 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.

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.
●Installers must be trained, experienced, and licensed service
technicians.
●Follow local codes for installation and application requirements.
After the installation is complete, verify proper operation of the
NaviCirc by following the instructions provided in this manual.

3
1. About the NaviCirc 5
1.1 Included Items 5
1.2 Specications 6
1.3 Compatible Products & Pump Requirements 7
1.4 Conguration 8
1.5 Supply Connections 9
1.6 Installing the NaviCirc 10
1.6.1 Installing the NaviCirc 11
1.6.2 Leak Check & Air Purge 12
1.7 Securing the NaviCirc to the Wall 13
2. Application System 14
2.1 NPE-A System 14
2.1.1 Application Guidelines 14
2.1.2 NPE-A System Diagram 18
2.2 NPE-A2/S2 System 22
2.2.1 Setting External Recirculation Mode 22
2.2.2 External Pump Wire Connection 26
2.2.3 Navien HotButton Kit (Optional) 32
2.2.4 System Application – External Recirculation 37
Contents

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2.3 NPN System 42
2.3.1 External Pump Wire Connection 42
2.3.2 Adjusting the Recirculation Parameters 48
2.3.3 External Recirculation with NaviCirc 50
2.3.4 External Recirculation with HotButton (Optional)
and NaviCirc 52
2.4 NCB-H System 54
2.4.1 Setting the DHW Operation 54
2.4.2 Setting External Recirculation 56
2.4.3 Examples of Electrical Connections 57
2.4.4 External Recirculation with NaviCirc 62
2.4.5 External Recirculation with HotButton (Optional)
and NaviCirc 65
2.5 NFC-H System 69
2.5.1 Setting the DHW Operation 69
2.5.2 Setting External Recirculation 71
2.5.3 Examples of Electrical Connections 72
2.5.4 External Recirculation with NaviCirc 80
2.5.5 External Recirculation with HotButton (Optional)
and NaviCirc 83
3. Troubleshooting 86

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1. 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. This prevents hot water loss and heating time loss.
To prevent too much hot water from owing into the cold water line,
the NaviCirc includes a feature that automatically blocks circulation
when reaching a temperature of approximately 95°F (35°C).
1.1 Included Items
NaviCirc
(Recirculation Valve)
Installation and Operation
Manual
Anchors and Screws Flexible Hoses (with kit only)

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1.2 Specications
Refer to the following table for product specications.
Items Specications
Product Name NaviCirc
Part Number PFFW-SXX-001
Water Flow Rate Range 0.53 - 1.06 GPM (2.0 - 4.0 LPM)
Crossover Shuto Temperature 95℉(35℃)
Water Temperature Range 41℉to 180℉ (5℃to 82℃)
Ambient Temperature Range 32 - 122℉ (0 - 50℃)
(Indoor use only)
Storage Temperature Range 14 - 122℉ (-10 - 50℃)
Max Water Pressure 150 psi
Installation Operation Horizontal
Dimensions (in) 5.62 x 3.93 x 2.19
Weight (lb) 1.10 lb (0.5 kg)
WARNING
Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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1.3 Compatible Products & Pump
Requirements
The NaviCirc is compatible with Navien NPE-A/A2/S2 and NPN
Series water heaters and NCB-H/NFC-H Series combi boilers.
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. 15 ft (4.6 m) – 23 ft (7 m)
Note Navien does not guarantee the performance of the
NaviCirc when used on a non-Navien appliance.
NOTICE
If the selected external pump does not meet the recommended
specications provided in this manual, the NaviCirc may not
operate properly.

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

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1.5 Supply Connections
Refer to the following table for the NaviCirc supply connection
specications.
A
C D
B
A
C
D
B
Front view Side view
List Connection
AHot Water Outlet PF ½”
BCold Water Outlet PF ½”
CHot Water Outlet PF ½”
DCold Water Outlet PF ½”
Dimension (in) 5.62 x 3.93 x 2.19
Supply Connections

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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“)
Navien exible hoses
(supplied with kit only)
(1/2” x 3/8”) 3/8” to 1/2” adaptor
3/8” to 1/2” adapters
Hot and cold water
shut o valve (3/8”)

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1.6.1 Installing the NaviCirc
1. Make sure that the install location is near the faucet furthest
from the water heater.
2. Close the hot and cold water inlet shuto valves.
3. Open both the hot and cold water faucets.
4. Disconnect the 3/8” (or 1/2”) hose that was originally connected
to faucet.
5. Secure the NaviCirc below the faucet in the desired location.
6. Connect the 3/8” to 1/2” adaptor to the NaviCirc HOT OUT and
COLD OUT (or the hot and cold shuto valves depending on
the shuto valve hose size) connections.
7. Connect the end of the existing 3/8” (or ½”) hot and cold water
hoses connected to the faucet to the HOT OUT and COLD
OUT connections.
Note Do not use Teon tape or adhesives on the NaviCirc
1/2” male orices. Make sure to use hoses with
rubber gaskets.
8. Connect Navien supplied 1/2” to 3/8”ex line or other exible
hose to 3/8” hot and cold shuto valves with or without the
adaptor depending on the existing shuto valve hose size.
9. Connect the remaining 1/2”hot and cold water ex lines to the
NaviCirc HOT IN and COLD IN connections.
10. Open the hot and cold water shuto valves before using the
NaviCirc.
WARNING
Ensure that the hot and cold water shuto valves are open
before using the NaviCirc. Operating the device without
opening the valves will build hot water pressure and may
result in injury or death.

12
1.6.2 Leak Check & Air Purge
1. Close hot water and cold water faucets.
2. Open hot water and cold water shuto valves.
3. Open hot water and cold water faucets.
4. Check if there are leaks after connecting the hoses to the
NaviCirc.
Note In case of leaks, close the shuto valves and repair
any leaks.
5. Purge the air from the system by opening the hot water and
cold water faucet.
Note Perform an air purge so that all residual air can
properly leave the system pipes. If the air purge is
not performed long enough, the recirculation valve
may not operate properly. Also, residual air can
damage the recirculation pump.

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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.
Note Do not forcefully secure the NaviCirc to the wall with
anchor bolts, as this can damage the system. Make
sure to place it horizontally in a xed position as shown
above.

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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 2 3 1 24 5 6 7 8 9 10
ON ON
1-OFF
2-ON
2. On the front panel, press the Power button to turn o the
water heater.
3. 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.
Note Maximum recirculation pipe lengths:
●100 feet (approx 30 m) equivalent length of ½”
copper pipe
●400 feet (approx 120 m) equivalent length of ¾”
copper pipe

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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.
No. Mode Display
1 Technical information
2 Parameter information
5. Use the Up [+] and Down [-] buttons to enter Parameter #17
(P.17 – Enable Thermal Bypass Valve).
Item Name Description Display
P17 Enable thermal
bypass valve
Set thermal bypass
valve operation
(Required Adjustments to the Available Parameters)

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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.
Null Setting for S-type models, Panel DIP3
ON, Cascade ON, or AHU is enabled.
Note ●Additional parameters are available to adjust unit
operation for various plumbing systems. Refer to
the NPE Installation & Operation Manual for more
information on these parameters.
Items Description
Pump Cycle
Interval Time
(P.12)
Sets the maximum time that the
internal circulator will operate once a
recirculation cycle has been initiated.
●Setting range: 1 to 120
(in 1-minute increments)
●Default: 20 min
Note
When the optional HotButton
accessory is installed, the maximum
setting value is limited to 5 minutes.

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Items Description
Return Line
Sampling Time
(P.14)
Sets the length of time that the
circulator will operate periodically in
order to check the temperature of the
recirculation return line and see if it
needs to be re-heated.
●Setting range: 1 to 120
(in 1-minute increments)
●Default: 30 min
●Set the 2-way valve inside the water heater to“EXT.”

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2.1.2 NPE-A System Diagram
Follow the instructions to install the NaviCirc to the wall.
City water supply
1 2 3 4
ON
SW1
CE1
RA1
U1
CE1
C1
C2
C7
R6
SW1
Q1
12V SIGNAL
SIGNAL 1
GND
5V
J1R5
J2
C4
ZD1
R7
D1
CON3CON2
CON1
SIGNAL
SIGNAL 3
GND
SIGNAL2
Wired
push button
Wired
push button
Wired
push button
HotButton kit*
DHW supply
Return water
Navien NPE A
Water heater
Check Valve
(required)
S
Solenoid
Valve**
Expansion tank***
NaviCirc
Ball
Valve
Ball
Valve
Ball
Valve
Flexible
hoses
Flexible
hoses
City water supply
1 2 3 4
ON
SW1
CE1
RA1
U1
CE1
C1
C2
C7
R6
SW1
Q1
12V SIGNAL
SIGNAL 1
GND
5V
J1R5
J2
C4
ZD1
R7
D1
CON3CON2
CON1
SIGNAL
SIGNAL 3
GND
SIGNAL2
Wired
push button
Wired
push button
Wired
push button
HotButton kit*
DHW supply
Return water
Navien NPE A
Water heater
Check Valve
(required)
S
Solenoid
Valve**
Expansion tank***
NaviCirc
Ball
Valve
Ball
Valve
Ball
Valve
Flexible
hoses
Flexible
hoses
Note
A branch from the cold water line must
be connected to the RECIRCULATION
RETURN water connection located on
the water heater. Additionally, the end
user might experience lukewarm water
when rst opening the cold water tap.
Maximum recirculation pipe lengths:
●100 feet (approx 30 m) equivalent
length of ½” copper pipe
●400 feet (approx 120 m) equivalent
length of ¾” copper pipe
* The HotButton kit is sold separately.
** Solenoid valve not required under
most conditions. Temperature
uctuations may occur during high
system ow rates.
*** Expansion tank only required if a
check valve is installed on the cold
water supply line or if required by
local codes.
Install the recirculation valve to the faucet furthest from the water
heater.
If installed in close proximity to the water heater, faucets further
away from the water heater will take longer to receive hot water.

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2.1.2 NPE-A System Diagram
Follow the instructions to install the NaviCirc to the wall.
City water supply
1 2 3 4
ON
SW1
CE1
RA1
U1
CE1
C1
C2
C7
R6
SW1
Q1
12V SIGNAL
SIGNAL 1
GND
5V
J1R5
J2
C4
ZD1
R7
D1
CON3CON2
CON1
SIGNAL
SIGNAL 3
GND
SIGNAL2
Wired
push button
Wired
push button
Wired
push button
HotButton kit*
DHW supply
Return water
Navien NPE A
Water heater
Check Valve
(required)
S
Solenoid
Valve**
Expansion tank***
NaviCirc
Ball
Valve
Ball
Valve
Ball
Valve
Flexible
hoses
Flexible
hoses
City water supply
1 2 3 4
ON
SW1
CE1
RA1
U1
CE1
C1
C2
C7
R6
SW1
Q1
12V SIGNAL
SIGNAL 1
GND
5V
J1R5
J2
C4
ZD1
R7
D1
CON3CON2
CON1
SIGNAL
SIGNAL 3
GND
SIGNAL2
Wired
push button
Wired
push button
Wired
push button
HotButton kit*
DHW supply
Return water
Navien NPE A
Water heater
Check Valve
(required)
S
Solenoid
Valve**
Expansion tank***
NaviCirc
Ball
Valve
Ball
Valve
Ball
Valve
Flexible
hoses
Flexible
hoses
Note
A branch from the cold water line must
be connected to the RECIRCULATION
RETURN water connection located on
the water heater. Additionally, the end
user might experience lukewarm water
when rst opening the cold water tap.
Maximum recirculation pipe lengths:
●100 feet (approx 30 m) equivalent
length of ½” copper pipe
●400 feet (approx 120 m) equivalent
length of ¾” copper pipe
* The HotButton kit is sold separately.
** Solenoid valve not required under
most conditions. Temperature
uctuations may occur during high
system ow rates.
*** Expansion tank only required if a
check valve is installed on the cold
water supply line or if required by
local codes.
Install the recirculation valve to the faucet furthest from the water
heater.
If installed in close proximity to the water heater, faucets further
away from the water heater will take longer to receive hot water.

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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 o before proceeding with
the installation of the wiring.
2. Remove the front cover from the unit and remove the PCB by
removing the 2 attaching screws from the housing.
3. Use a 120 VAC (max 1.5 A) normally closed solenoid valve for
this application (a slow closing solenoid is recommended to
prevent water hammer).
4. Connect the external pump wire to the proper wires from the
solenoid valve.
5. Remove the 2 screws holding the PCB box in place and
remove the PCB box from the system.
Remove Screws here.