Lawler NEPTUNE EMX 075 Instruction Manual

temperedwater.com
5330 East 25th St.
Indianapolis, IN 46218
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INSTALLATION &
MAINTENANCE MANUAL
Design and specifications subject to change without notice.
Please refer to temperedwater.com to ensure most
current data sheet and other design solutions.
CAUTION: When maintaining and adjusting the
mixing valve, all xtures should be isolated from
use. Lawler Manufacturing Co., Inc. recommends
that you work safely at all times and in a manner
consistent with the OSHA Lock/Tagout standard,
29 CFR 1910.147 and other applicable standards.
temperedwater.com/patents
ASSE 1017 Approved
NST 372 Certied Lead Free
Certied to CSA B125.3
NOTICE! No mixing valve will work satisfactorily if improperly installed. We suggest, therefore, that you read
these instructions carefully before installing and follow directions as outlined. Handle the mixing valve with care.
Neptune EMX Electronic
Mixing Valve
WARNING: This product contains chemicals known
to the State of California to cause cancer and birth
defects or other reproductive harm.
(Installer: California law requires that this warning
be given to the consumer.)
For more information: www.oehha.org/prop65
Each system consists of
PI Controller with LED Readout
Fast Immersion Sensor 1/2” NPT
Stainless Steel 3-Way Valve
NEMA 4 Enclosure
Description
EMX is an ASSE 1017 Listed Electronic Tempering Valve
System used to control domestic hot water temperature. The
EMX is designed to work in domestic hot water systems a
return line and a continuously running recirculation pump.
The EMX valve should not be used in a gang shower
application. Use an ASSE 1069 approved valve for those
applications.
Features
• Easy setup, simple 3 button interface
• Low demand dead zone with adjustable activation point
• High temperature alarm function
• Fast sampling rate of sensor input
• Two valves can be installed in parallel with one controller
• ModBus communication standard
• Lead Free valve conforms to NSF/
ANSI 372-2011 requirements
Selection
Valves should be selected based on
a 5 to 10 PSI pressure drop. The
valve is typically smaller than the
system piping for most applications.
Pressure Drop PSI 5 10 20 30
Valve Inlet Size CAPACITY GPM
NEPTUNE EMX 075 3/4 17 24.3 34 43
NEPTUNE EMX 100 1 25.5 37 52 64
NEPTUNE EMX 125 1-1/4 41.4 58.6 83 101
NEPTUNE EMX 150 1-1/2 64.4 91 128 157
NEPTUNE EMX 200 2 102 145 205 252
Minimum owrate 1/4 gpm in properly recirculated system.
5 gpm minimum recirculation ow rate.
Technical Data
Water Temperature Ranges
Cold Inlet 39° F to 80° F
Hot Inlet 120° F to 200° F
Outlet 95° F to 140° F
Maximum Pressure 150 PSI
Model Size
EMX-075 3/4”
EMX-100 1”
EMX-125 1-1/4”
EMX-150 1-1/2”
EMX-200 2”
WARNING: The EMX is not a safety device.
It should not be installed as an anti-scald device.
It is only a temperature control system.
Only professional installers with working
knowledge of plumbing and electrical systems
should install the EMX system. Incorrectly installed
or sized systems will result in improper function of
the control system

Installation
Valve
The EMX valve is connected to the hot water supply, cold
water supply, and mixed outlet. The valve should be piped
per the diagram on the following page.
Provide three full port ball valves, one on each connection
for isolation and servicing the valve.
Instructions
1. Flush pipes prior to installing mixing valve.
2. Install isolation valves at inlets and outlet (not included)
to comply with applicable codes.
3. Connect inlets and outlet and check for leaks. See
piping diagram for details.
4. Connect the power supply.
5. Open isolation valves to start the ow of water to and
through the Neptune EMX mixing valve.
6. The factory default set temperature is 120˚F (50˚C)
7. To adjust temperature refer to the “Settings” section of
this manual.
The Neptune controller features a High Temperature Limit Alarm. The limit can be set at
15-40 °F over setpoint with an adjustable time delay of 3 to 300 seconds. If this limit is
triggered, the state of the SPDT relay changes and the LED readout will read HL A.
Example:
Setpoint = 125 °F, L= 15°F, d = 10 seconds. The alarm is triggered at 140°F after 10 seconds
Piping Diagram
The recirculation pump should run continuously at a
minimum ow of 5 gpm.
Ensure supply pressures are equal.
The return must be piped as shown; connecting into both
the cold side of the mixing valve and hot water source.
Almost all technical issues stem from improper piping.
Sensor Mounting
ATTENTION! The installer must follow all
local codes for installation and provide
check valve to prevent ow between lines.
*Note: the ball valve installed on the return line going to the
mixing valve may be throttled to account for an oversized
system return. This will help stabilize a system with an
oversized return ensuring the cold water inlet is not too hot
for mixing. The ball valve going back to the hot water source
should not be throttled. A balancing valve may be installed
in place of ball valve for more accurate control.
Actuator

GUARANTEE
We guarantee the Lawler Mixing Valve to be free from defects in workmanship and material, and for
a period of one year from date of purchase, will replace any parts found by us to be defective. We will
not be held responsible, however, for any labor incidental to, or for any damages caused by defective
material. Each mixing valve is thoroughly inspected and tested under actual conditions at our factory.
Settings
With the simple 3 button interface, select temperature scale and change control parameters to match system requirements.
The factory defaults are typical for a tempering valve system.
The simple 3 key operator interface performs all the functions needed to adjust and set the operating parameters for the
control loop.
Keep recirculation pump running at minimum of 5 gpm.
Press and hold the enter key for 3 seconds to place the interface in adjustment mode.
Use the keys to move between functions.
Once at the default set temperature (120°F) press then make temperature changes with
When nished, conrm the change with then select the next function with
When all changes have been made, hold down for 3 seconds to exit adjustment mode.
The main display shows the current system temperature.
See separate documentation for:
• Piping and wiring two valves in parallel
• ModBus connection and register
• Neptune EMX Domestic Tempering System with fail safe actuator
STORAGE
TANK
WATER
HEATER
HEAT TRAP
27” DROP
RECIRCULATION
PUMP
BALANCING
VALVE
CW
CW HW
CV
CV
CV
CV
TO LOW
TEMPERATURE
FIXTURES
Water heater must
be installed per
manufacturers O+M
Pump must run continuously
at a minimum of 5 gpm.
STORAGE
TANK
WATER
HEATER
HEAT TRAP
27” DROP
RECIRCULATION
PUMP
BALANCING
VALVE
CV
CW
CW HW
CV
CV
CV
CV
TO LOW
TEMPERATURE
FIXTURES
TO HIGH
TEMPERATURE
FIXTURES
RECIRCULATION
PUMP
Water heater must
be installed per
manufacturers O+M
Pump must run continuously
at a minimum of 5 gpm.
Figure 1
When used in a single temperature
recirculating system
Figure 2
When used in a dual temperature
recirculating system

Notes