Leonard NUCLEUS VALVE NV-200-LF Guide

HOT INLET COLD INLET
MIXED OUTLET
Bulletin NUC-1
March 2022
1360 Elmwood Avenue, Cranston, RI 02910 USA
Phone: [phone] Fax: [phone]
Email: [email protected]m
Web Site: http://www.leonardvalve.com
INSTALLATION ADJUSTMENT SERVICE
NUCLEUS VALVE
IMPORTANT! Provide serial number when ordering parts!!
INSTALLATION
1. Leonard Nucleus Valves are factory pre-assembled and
tested and include digital mixing valve and controls
which function as a system to meet both high and low
demand for tempered water.
2. System should be installed at a location where it can
easily be cleaned, adjusted or repaired.
3. System supplies must be connected as shown (Hot-left,
Cold-right). Exercise caution when soldering.
4. Flush pipes thoroughly after system has been
connected.
5. This assembly MUST be piped according to
LEONARD’S REQUIRED PIPING METHOD W.
6. Refer to pages 2-4 of this bulletin for correct Setup
Instructions.
Model NV-150-LF – 1¼” Inlets, 1½” Outlet
Model NV-200-LF – 2” Inlets and Outlet
Model NV-300-LF – 3” Inlets and Outlet
Maximum Operating Pressure 125PSI (8.6 BAR) for Hot and Cold Water.
Hot Water Temperature Range: 120º - 180ºF (49º - 82ºC)
Cold Water Temperature Range: 39º - 80ºF (4º - 27ºC)
Temperature Adjustment Range: 65º - 180ºF (18º - 82ºC)
INSTALLATIONAND FIELD ADJUSTMENTS ARE THE
RESPONSIBILITYOF INSTALLER. READ ALL
INSTRUCTIONS PRIOR TO INSTALLATION
1
WARNING: This product can expose you to
chemicals including lead, which is known to the State
of California to cause cancer. For more information, go
to www.P65Warnings.Ca.gov
!

SETUP INSTRUCTIONS
110V POWER
SUPPLY
GREEN WIRE
EARTH GROUND
CONNECTOR
MIXED OUTLET
ISOLATION VALVE
ETHERNET
CONNECTION
MIXED OUTLET
TEMPERATURE
PROBE
NUCLEUS VALVE
CONTROL PANEL
COLD INLET
CHECK VALVE
MOTOR WIRING
CONNECTOR
NUCLEUS VALVE
MOTOR & BODY
HOT INLET
CHECK VALVE
WARNING
The Leonard Nucleus Digital Mixing Valve is an electronically controlled device utilizing DC
circuitry. The Green Wire Earth Ground Connector MUST be properly grounded to a nearby
suitable earth ground prior to connecting the Outlet RTD Probe, Motor Wiring Harness and
the Main Unit Power Supply. Installer must follow detailed instructions below to ensure
proper operation of valve.
RELAY RATING: 30 V DC, SELV, LPS, or Class 2, 2 Amp MAX, 60W, NO Only
Valve assembly is suitable for indoor use only
Valve outlet must face down and be piped to Method W, see page 31
•NOTE! READ ALL INSTRUCTIONS PRIOR TO INSTALLATION
2

INSTALLATION INSTRUCTIONS
1. The Nucleus Unit MUST be piped according to a Leonard Required Piping Method W (see
page 31).
2. Mount valve body outlet facing down and plumb inlet and outlet connections. DO NOT
introduce water to the valve until completion of these instructions.
3. Mount Nucleus Control Box to supplied Mounting Bracket and adjust the tuning screw on
the bracket to desired position. Ensure all wiring exiting the box is accessible.
4. Connect Green Wire Earth Ground Connector to suitable nearby earth ground location.
5. Remove compression fitting from left side of the valve outlet. Slide RTD Probe #1 through
the compression fitting and insert into the left side of the valve outlet. Tighten
compression fitting by hand, and then tighten just 1/8 to 1/4 turn. DO NOT overtighten
fitting. See page 30 for more detail.
6. If additional RDT probes and pressure sensors are included, install them at the appropriate
locations. If ‘IF-RTS’ option is included, leave provisions for the RTD probe marked
“RETURN” to be installed on the tempered return line (1/2” NPT Connection). Tighten
compression fittings by hand, and then tighten just 1/8 to 1/4 turn. DO NOT overtighten
fittings. See page 30 for more detail. Plug in pressure sensor harnesses into the pressure
sensors.
7. Connect and tighten Motor Wiring Harness, if needed.
8. Open all inlet and outlet check-stops and ball valves to pressurize Nucleus valve.
9. Plug power supply into 110V receptacle. GFCI receptacles are recommended. Installer to
follow local electrical codes.
10. Powering Valve Control Box will cause the valve motor to initiate a FULL VALVE SWEEP
(End to End), indicating that the motor has traveled 900-1500 Steps. Following the FULL
SWEEP, the valve is ready for commissioning and the LED Screen will display the following:
ERR: 1 EEPROM
Commission Unit
11. Installer will then press the ENTER key which will lead to the following LED screen display
CUR TEMP: XXXF
SET POINT: XXXF
12. Press ENTER to adjust SET POINT temperature. Use ▲▼ buttons to adjust SET POINT
temperature to required outlet temperature. The Nucleus Valve will automatically adjust to
new SET POINT, though this does not mean the unit is fully commissioned.
3

Nucleus Digitally Controlled Mixing Valve User Interface
The Nucleus Digitally Controlled Mixing Valve consists of an electronics box that is simplistic in
design and has a user interface that is intuitive. The Overlay pictured above is a graphical
representation of a typical plumbing system where a Digital Thermostatic Mixing Valve
provides mixed hot water to the plumbing system. At key locations on the diagram, there are
6 LED indicators that provide system status either “within range” (Green) or “out of range”
(Red) and they are as follows:
Inlet Hot Water Pressure (P1), Inlet Hot Water Temperature (T1), Inlet Cold Water Pressure
(P2), Inlet Cold Water temperature (T2), Mixed Water Temperature Sensor (T3), and Return
Water Temperature Sensor (T4).
Above the Overlay is a 2 Line, 16 character LED digital display screen, which serves as the User
Interface by utilizing a simple 3-button keypad interface:▲, ▼and ENTER
On Initial Power up, the valve will go through a full sweep function, which moves the motor its
full travel, end-to-end of hot and cold ports of the valve body. This process assigns a
numerical value to the distance travelled by the motor, in steps, that will be used in future
comparisons to indicate if there is a potential maintenance problem or internal mechanical
issue with the components of the valve.
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User Screens
Home Screen:Current outlet temperature and Set point temperature
Home Screen: After initial “Full Sweep” the digital display indicates current measured
temperature on the mixed outlet of the valve (T3) and shows set point temperature on the
line below. Note: A large negative value displayed at the Cur temp line indicates the sensor is
damaged or not properly wired to the main control board. Temperature is easily adjusted by
pressing the ENTER key and pressing the ▲and ▼keys to adjust temperature up or down.
When desired value is reached, pressing the ENTER key will store the new set point
temperature the valve will target and a message stating that the set point has been saved will
be displayed. If no new temperature is saved, the screen display will revert back to the Home
Screen after approximately 10 seconds and the set point will remain unchanged. Symbols +
and –indicate whether the outlet temperature is being adjusted higher (+) or lower (-) by the
controller.
Standard Menu: Options on Board/Equipped:
Pressing either the ▲or ▼keys will allow a user to scroll through other data points, features
and options of the valve and will show the following screens and features in order.
Note: ▼key was used for this manual’s sequence and should be considered forward
direction in the menu. Pressing the ▲key will reverse the order and can be considered
reverse direction.
Menu Screen 1: Inlet Hot Water Temperature
Pressing ▼1 time displays Hot temp: XXX F or C
This screen displays actual hot water inlet supply temperature as measured at RTD (T1) if the
Nucleus is so equipped with the optional inlet temperature sensors.
Note: A large negative value displayed at the Hot temp line is an indication that there is no
sensor installed to the main control board, the wiring to the main board is improper or the
sensor is damaged. 5

Menu Screen2: Inlet Cold Water Temperature
Pressing ▼2 times displays Cold temp: XXX F or C
This screen displays actual cold water inlet supply temperature as measured at RTD (T2) if
the Nucleus is so equipped with the optional inlet temperaturesensors.
Note: A large negative value displayed at the Cold temp line is an indication that there is
no sensor installed to the main control board, the wiring to the main board is improper or
the sensor is damaged.
Menu Screen3: Return Water Temperature
Pressing ▼3 times displays Rtrn temp: XXX F or C
This screen displays actual return water temperature if the Nucleus is equipped with the
optional Return Temperature RTD, value as measured on (T4).
Note: A large negative value displayed at the Rtrn temp line is an indication that there is
no sensor installed to the main control board, the wiring to the main board is improper or
the sensor is damaged.
Menu Screen 4: Inlet Hot Water Pressure
6

Pressing ▼4 times displays Hot psi: XX.XX
This is a measurement of the inlet hot water supply pressure (PSI) available to the
mixing valve if the Nucleus is so equipped with the optional Pressure Sensor (P1).
Note: A large negative value displayed at the Hot psi line is an indication that there
is no sensor installed to the main control board, the wiring to the main board is
improper or the sensor is damaged.
Menu Screen 5: Inlet Cold Water Pressure
Pressing ▼5 times displays Cold psi: XX.XX
This indicates of the inlet cold water supplypressure (PSI) available to the mixing valve if the
Nucleus is so equipped with the optional Pressure Sensor (P2).
Note: A large negative value displayed at the Cold psi line is an indication that there is no
sensor installed to the main control board, the wiring to the main board is improper or the
sensor is damaged.
Menu Screen 6: Optional Daughter Board
Pressing ▼6 times displays Daughter Brd: N or Y
This screen indicates whether or not the control box is equipped with a Daughter Board,
which is an add-on optional circuit board for the following additional equipment and
capabilities:
4 additional Temperature Probes (RTD’s) T5, T6, T7, T8, 2 Flow Meters (F1 & F2) and/or
1 additional pressure sensor (P3) which are standard 4-20mA inputs
(See Page 28 for details regarding Daughter Board)
Note: If ‘N’ is showing for Daughter board, there will be no additional support screens
associated with Sensors T5, T6, T7, T8 and F1, F2 and/or P3.
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Note: If the Nucleus control box is equipped with a Daughter Board the following will show:
This Menu Screen will be followed by the additional screens associated with the optional equipment
that may or may not be incorporated into the Nucleus configuration.
The following additional equipment may be on board:
4 additional Temperature Probes (RTD’s) T5, T6, T7, T8, 2 Flow Meters (F1 & F2) and/or
1 additional pressure sensor (P3) which are standard 4-20mA inputs
(See Page 28 for details regarding Daughter Board)
Menu Screen 7: Optional Temperature Probe 5 (T5)
Pressing ▼7 times displays Temp 5: XXX F or C
This indicates and displays actual temperature as measured on RTD (T5) if the Nucleus is so equipped
with the optional temperature sensors.
Note: A large negative value displayed at the Temp 5 line is an indication that there is no sensor
installed to the main control board, the wiring to the main board is improper or the sensor is
damaged.
8

Menu Screen9: Optional Temperature Probe 7 (T7)
Pressing ▼9 times displays Temp 7: XXX F or C
This indicates and displays actual temperature as measured on RTD (T7) if the Nucleus is so
equipped with the optional temperature sensors.
Note: A large negative value displayed at the Temp 7 line is an indication that there is no sensor
installed to the main control board, the wiring to the main board is improper or the sensor is
damaged.
Menu Screen 10: Optional Temperature Probe 8 (T8)
9
Pressing ▼10 times displays Temp 8: XXX F or C
This indicates anddisplays actual temperature as measured on RTD (T8) if the Nucleus is so equipped
with the optional temperaturesensors.
Note: A large negative value displayed at the Temp 8 line is an indication that there is no sensor
installed to the main control board, the wiring to the main board is improper or the sensor is
damaged.
Pressing ▼8X displays Temp 6: XXX F or C
This indicates and displays actual temperature as measured on RTD (T6) if the Nucleus is so
equipped with the optional temperature sensors.
Note: A large negative value displayed at the Temp 6 line is an indication that there is no sensor
installed to the main control board, the wiring to the main board is improper or the sensor is
damaged.
Menu Screen8: Optional Temperature Probe 6 (T6)

Menu Screen12:
Additional Optional Flow Sensor (F2) OR OptionalPressure Sensor Input Channel (P3)
Pressing ▼12 times displays Flow 2: XXX or Psi 3: XX.X
This indicates and displays actual flow in (GPM) on Flow channel 2 for the optional Daughter Board.
See Page 28 for wiring setup.
NOTE: This channel can also be configured to accept a Pressure Sensor as an alternate and can be
setup in the commissioning menu. See Commissioning Menu.
If this channel is configured to accept a pressure input instead, the Menu Screen will look as follows:
10
This is an indication of the actual measured value of pressure (PSI) on pressure sensor 3 (P3) if the
Nucleus is so equipped with the optional Pressure Sensor (P3).
Note: A large negative value displayed at the Flow 2 or Psi 3 line is an indication that there is no
sensor installed to the main control board, the wiring to the main board is improper or the sensor
is damaged.
Pressing ▼11 times displays Flow 1: XXX
This indicates anddisplays actual flow in (GPM) on Flow channel 1 for the optional Daughter Board.
See Page 28 for wiring setup.
Note: A large negative value displayed at the Flow 1 line is an indication that there is no sensor
installed to the main control board, the wiring to the main board is improper or the sensor is
damaged.
Menu Screen11: Optional Flow Sensor (F1)

Menu Screen14: Back-up Uninterruptable Power Supply
Pressing ▼14X displays UPS: XX.XX
If the Nucleus is equipped with an uninterruptable power supply for standby operation in the
event of power loss, and there is a loss of primary power to the device, there will be a
numerical value in this field and it should be always at least 12 VDC
Menu Screen 15: Building Management System Module
11
Pressing ▼15X displays BMS Connected: N or Y
In order for this to be 'Y', or YES, the control box needs the following conditions: The Leonard
supplied ProtoCessor needs to be installed on the main Printed Circuit Board. Thisscreen
confirms that the protocol converter is communicating with the main PCB. If ‘N’ is displayed and
a ProtoCessor is connected, make sure the module is installed properly.
Pressing ▼13 times displays POWER: 12.88
This indicates the input supply voltage to the main control board, Volts DC, and should always
be at least 12 VDC
Menu Screen 13: Main Power Supply

Home Screen:Current outlet temperature and Set point temperature
12
Pressing ▼17 times displays Cur Temp: XXX F or C
The user is returned to the ‘Home Screen’ which displays current temperature as measured on
valve outlet (T3) and the set point temperature on the line below.
Note: A large negative value displayed at the Cur temp line indicates the sensor is damaged or
not properly wired to the main control board.
Note: Pressing the ▲key will reverse the order previously shown and allow the user to scroll
through the above menu items in reverse order.
Pressing ▼16 times displays FW Rev: X.X.X.X
This screen shows the current version of Firmware loaded into the Nucleus processor. It may
be used for reference and troubleshooting.
Menu Screen 15: Building Management System Module

Commissioning Menu Screen 1: 5V Motor
Initial Screen in commissioning menu is asking whether or not the motor installed is a 5V
motor. If the motor is 5V, choose ‘Y’. If the motor installed is a 12V, select ‘N’.
13
Nucleus Digitally Controlled Mixing Valve Commissioning
The commissioning menu on the Nucleus Digitally Controlled Mixing Valve is entered by
pressing a sequence of keys on the keypad as a “protected” step as this requires the end-user
to be aware of potential changes to the programming and the subsequent associated
potential risk to users downstream of the device.
WARNING: You are about to enter commissioning menu of the Nucleus Digitally
Controlled Mixing Valve and adjustments to the mixing valve may result in severe burns,
injury and/or death to users downstream of the device if proper safety precautions are not
adhered to.
Commissioning the Digital Mixing Valve - Overview
1. To enter the commission menu via panel, push the keys in the following sequence:
▲▼▲▼ ENTER
2. Now in commissioning mode, use ▲or ▼keys to scroll though the various adjustable
parameters and set points. At each screen pressing the ENTER key causes the default
value to flash and the value shown can be changed using the ▲▼ keys. Once the
desired value is displayed, pressing ENTER locks in the new value. Continue reading for
description and limitations of each parameter.
3. Once all desired values have been entered, scroll to SAVE screen using ▲or ▼keys and
press ENTER. Using ▲or ▼keys, scroll to ‘Y’ and press enter. The values are now saved.
The screen should now display the CURRENT and SET POINT temperatures and the panel
will begin to indicate if any conditions are in error or alarm state.
4. See page 38 to record all of the commissioned settings.

Commissioning Menu Screen 3: Minimum System Temperature
Pressing ▼2 times displays Min temp
This is minimum temperature as measured on the primary outlet temperature sensor of the Nucleus
Mixing Valve RTD (T3). Measured values above this value will cause an alarm condition that will
switch a relay to Normally Opened (See Page 27, Alarm Relay Detail). Default value is 65°F.
Commissioning Menu Screen 4: Maximum Outlet Temperature
Pressing ▼3 times displays Max temp
This is maximum temperature as measured on the primary outlet temperature sensor of the Nucleus
Mixing Valve RTD (T3). Measured values above this value will cause an alarm condition that will
switch a relay to Normally Opened (See Page 27, Alarm Relay Detail). Default value is 130°F.
14
Pressing ▼1 time displays Min temp
Initial Screen in commissioning menu requests the scale of temperature measurement in
Fahrenheit (F) or Celsius (C)
Commissioning Menu Screen 2: Temperature Scale

Pressing ▼4 times displays Err TTML
This indicates the TIME TO MAKE LIVE, which is an elapsed time in seconds as to when an actual
error will be identified by the processor (e.g. low inlet supply pressure) and then subsequently
recognized as a true error and displayed on the LCD screen. The error must exist for at least this
minimum time before being considered a true error. The default value is 15 seconds.
Commissioning Menu Screen 6: Error Time to Live
Pressing ▼5 times displays Err TTL
This indicates TIME TO LIVE, which is a time in seconds and starts as soon as Err TTML has elapsed. An
error that exists past both TTML and TTL will require user recognition to clear error from screen by
pressing ENTER. If the problem corrects itself during the elapsing TTL time, the Error will be
automatically removed from the display on the user interface and therefore does not exist in memory.
Default time is 60 seconds.
Commissioning Menu Screen 7: Auxiliary Flow Sensor #2
Pressing ▼6 times displays Aux2 flow: N or Y
This indicates whether or not the configurable auxiliary channel, if utilized, is a 2nd flow meter or a
3rd pressure sensor supplied with the Nucleus unit. Select ‘Y’ if a flow meter is used or ‘N’ if a
pressure sensor is used. See Page 28 for proper wiring configuration 15
Commissioning Menu Screen 5: Error Time to Make Live

Commissioning Menu Screen 8: Shuttle Full Sweep
Pressing ▼7 times displays Commissioning Full sweep: N or Y
This feature allows the user to manually ‘sweep’ the shuttle inside the main valve body from full
hot to full cold position in order to verify mechanical integrity of the device, and verify that the
valve is traveling the entire range of its expected travel or operating range. To initiate a full
sweep, press ENTER and change the flashing value to ‘Y’ (yes) and press ENTER to confirm.
Commissioning Menu Screen 9:
Minimum Alarm Temperature for Temperature Sensor #5
Note: There are four (4) additional RTD temperature probe provisions (T5, T6, T7, T8) if the
Nucleus is equipped with an optional Daughter Board. Please see Screen 6 (Page 7) from
Options/Equipped section above and if Daughter Board is showing ‘Y’ (Yes), then these
temperature probes should be configured, if they are being utilized.
Pressing ▼8 times displays Commissioning Temp 5 min: 32F
This is the minimum temperature for RTD probe T5. Any temperature below this setting at T5
will trigger an error message. Default setting is 32˚F.
16

Pressing ▼9 times displays Commissioning Temp 5 max: 185F
This is the maximum temperature for RTD probe T5. Any temperature above this setting at T5
will trigger an error message. Default setting is 185˚F
Commissioning Menu Screen 11:
Minimum Alarm Temperature for Temperature Sensor #6
Pressing ▼10 times displays Commissioning Temp 6 min: 32F
This is the minimum temperature for RTD probe T6. Any temperature below this setting at T6
will trigger an error message. Default setting is 32˚F.
Commissioning Menu Screen 12:
Maximum Alarm Temperature for Temperature Sensor #6
Pressing ▼11 times displays Commissioning Temp 6 max: 185F
This is the maximum temperature for RTD probe T6. Any temperature above this setting at T6
will trigger an error message. Default setting is 185˚F
17
Commissioning Menu Screen 10:
Maximum Alarm Temperature for Temperature Sensor #5

Commissioning Menu Screen 13:
Minimum Alarm Temperature for Temperature Sensor #7
Pressing ▼12 times displays Commissioning Temp 7 min: 32F
This is the minimum temperature for RTD probe T7. Any temperature below this setting at
T7 will trigger an error message. Default setting is 32˚F
Commissioning Menu Screen 14:
Maximum Alarm Temperature for Temperature Sensor #7
Pressing ▼13 times displays Commissioning Temp 7 max: 185F
This is the maximum temperature for RTD probe T7. Any temperature above this setting at
T7 will trigger an error message. Default setting is 185˚F
18
Commissioning Menu Screen 15:
Minimum Alarm Temperature for Temperature Sensor #8
Pressing ▼14 times displays Commissioning Temp 8 min: 32F
This is the minimum temperature for RTD probe T8. Any temperature below this setting at
T8 will trigger an error message. Default setting is 32˚F

Commissioning Menu Screen 16:
Maximum Alarm Temperature for Temperature Sensor #8
Pressing ▼15 times displays Commissioning Temp 8 max: 185F
This is the maximum temperature for RTD probe T8. Any temperature above this setting at
T8 will trigger an error message. Default setting is 185˚F
19
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THERMAL DISINFECTION
WARNING: The Nucleus Digitally Controlled Mixing Valve is equipped with the ability to program the
valve to move to full hot position, which will allow ONLY high temperature hot supply water to enter
the device and subsequently deliver that high temperature water downstream of the device. There is
inherent risk in this procedure and it is a feature which allows the user to ‘Disinfect’ the plumbing
system downstream of the device.
Commissioning Menu Screen 17: Thermal Disinfection
Pressing ▼16 times displays Commissioning Disinfect: N or Y
BEFORE THIS MODE IS ENGAGED, AN AUTHORIZED USER MUST BE AWARE OF THE POTENTIAL RISKS
TO END USERS DOWNSTREAM OF THIS DEVICE, AND MUST ALSO MAKE PROVISIONS TO PUT SAFETY
MEASURES IN PLACE DURING THE DISINFECTION STAGE TO ENSURE USER SAFETY.
SEVERE BURNS, SEVERE INJURY AND/OR EVEN DEATH MAY OCCUR IF SUCH PROVISIONS ARE NOT IN
PLACE WHEN SELECTING ‘Y’ ON THIS MENU!

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Before a disinfection cycle is initiated, the MIN and MAX settings MUST be changed to accommodate
higher outlet temperatures. MIN setting should be set to the minimum desired disinfection
temperature. MAX setting should be changed to the maximum desired disinfection temperature. After
the first minute of disinfection, an error will be triggered if the outlet temperature is below the MIN or
above the MAX settings, which will automatically end the cycle.
SEVERE BURNS, SEVERE INJURY AND/OR EVEN DEATH MAY OCCUR IF SUCH PROVISIONS ARE NOT IN
PLACE WHEN SELECTING ‘Y’ ON THIS MENU!
Once ‘Y’ (yes) is chosen, the authorized user will then be prompted to enter the desired disinfection
time, adjustable in 15 minute increments, up to 12 hours. Choose the desired time and press ENTER to
start the timer. Extreme care must be taken during the disinfection process! Disinfection can be
cancelled at anytime by pressing the ENTER Key.