MARLO NXT2 Series User manual

MGT 30M–300M
SYSTEM 4 – SINGLE METERED
1” NXT2 SERIES
MODEL NO:
SERIAL NO:
DATE INSTALLED:
DEALER:
COMPLETE FOR FUTURE REFERENCE:
COMMERCIAL WATER CONDITIONER
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Standard Image
Equipment appearance may differ.
8-637

MGT 30M–300M NXT2 1” SINGLE
Inspection Requirement
Prior to Loading Media
1. Inspect condition of upper distributor piping. Verify
fittings are tight and positioned as shown.
2. Inspect condition of strainers, laterals and hub through
top or side access ports. Verify fittings are secured
to hub.
3. DO NOT load media if damaged components are
observed. Contact factory.
4. Installer is responsible for media loss into treated water
resulting from failure to report and repair damaged
components inside media tank prior to media loading.
5. INSTALLER WARNING:
Refer to installation instructions for media loading
procedure. Improper loading of media will damage
components inside media tank.
PRIOR TO
Media Loading
AFTER
Media Loading
SIDE
VIEW
Lateral
Hub
Distributor Tube
Media Tank
Softener/
Filter Media
Gravel
Media
TOP
VIEW
Media Tank
Lateral
Hub
5-272
IMPORTANT PLEASE READ:
• Warranty of this product extends to manufacturing defects.
• The information, specications and illustrations in this manual are based on the latest information
available at the time of printing. The manufacturer reserves the right to make changes at any time
without notice.
• This product should be installed by a plumbing professional on potable water systems only.
• This product must be installed in compliance with all local and state and municipal plumbing and
electrical codes. Permits may be required at the time of installation.

MGT 30M–300M NXT2 1” SINGLE
TABLE OF CONTENTS
SYSTEM INFORMATION
Product Warranty...........................................................................................................................................................1
General Arrangement Drawings ...................................................................................................................................2
Dimensional Data .........................................................................................................................................................3
Specication Table ........................................................................................................................................................4
INSTALLATION
General Information.......................................................................................................................................................5
Brine Tank Installation ..................................................................................................................................................6
Mounting Water Meter ..................................................................................................................................................7
Power Supply Installation ..............................................................................................................................................8
Connection Piping Installation ......................................................................................................................................8
OPERATION
Timer Display Features ................................................................................................................................................9
System Operation .......................................................................................................................................................10
Timer Operation ..........................................................................................................................................................10
Initiating Manual Regeneration ................................................................................................................................... 11
Start-Up Procedures....................................................................................................................................................12
User Programming Guide ...........................................................................................................................................13
Batch Size Calculation.................................................................................................................................................14
Diagnostic Flow Chart ................................................................................................................................................15
Master Programming Flow Chart.................................................................................................................................16
aster Programming Settings........................................................................................................................................18
Flow Diagrams ............................................................................................................................................................19
MAINTENANCE
Wiring Diagram ...........................................................................................................................................................21
Powerhead Assembly .................................................................................................................................................22
NXT2 Timer Assembly .................................................................................................................................................24
Control Valve Assembly with 1700 Injector..................................................................................................................25
Brine Injector Assembly ..............................................................................................................................................28
Plastic Inline Meter Assembly .....................................................................................................................................29
Brine Tank Assemblies ...............................................................................................................................................30
Service Assemblies ....................................................................................................................................................32
Troubleshooting...........................................................................................................................................................33

MGT 30M–300M NXT2 1” SINGLE
SYSTEM INFORMATION
1
COMMERCIAL AND INDUSTRIAL PRODUCT WARRANTY
Manufacturer warrants all water treatment products manufactured and/or distributed by it to be free from defects
in materials and workmanship for a period of one (1) year from installation or 18 months from the date of shipment
whichever comes rst. Fiberglass pressure vessels are warranted against defects in materials and workmanship for a
period of ve (5) years from the date of shipment.
If during that period any products shall be proven to the Manufacturer’s satisfaction to be defective, those products will
be replaced FOB factory or the price refunded at the Manufacturer’s option.
Manufacturer’s obligations for non-performance, defects, or any damage caused by its products or their use, and
buyer’s exclusive remedy therefore, shall be limited to product replacement or refund and shall be conditioned upon
Manufacturer’s receiving written notice together with a demand for such replacement or refund.
The foregoing warranty is exclusive and in lieu of all other expressed or implied warranty (except of title)
including but not limited to implied warranty of merchantability and tness for particular purpose.
Manufacturer will not be subject to and disclaims the following:
1. Any other obligations or liabilities arising out of breach of contract or out of warranty.
2. Any obligations whatsoever arising from tort claims (including negligence and strict liability) or arising under other
theories of law with respect to products sold or services rendered by Manufacturer or any undertakings, acts, or
omissions relating thereto.
3. All consequential, incidental, and contingent damages.
Labor charges, charge backs or handling charges are excluded from Manufacturer’s warranty provisions.
COMMERCIAL AND INDUSTRIAL WATER SOFTENER GUARANTEE
Under normal operating conditions:
1. The softener efuent shall be zero soft as determined by a soap test.
2. The loss of softening resin through attrition during the rst three (3) years shall not exceed 3% per year.
3. The softening resin shall not be washed out of the system during backwash.
4. The color and turbidity of the softener efuent shall not be greater than the incoming water.

MGT 30M–300M NXT2 1” SINGLE
SYSTEM INFORMATION
2

MGT 30M–300M NXT2 1” SINGLE
SYSTEM INFORMATION
3
DIMENSION CHART
MODEL INLET SIZE
(Inches)
TANK SIZE LENGTH
(Inches)
WIDTH
(Inches)
HEIGHT*
(Inches)
SOFTENER
(Inches)
BRINE
(Inches)
30 1 9x48 18x33 33 18 48
45 1 10x54 18x40 34 18 62
60 1 12x52 18x40 36 18 60
90 1 14x65 18x40 38 18 73
120 1 16x65 24x40 46 24 73
150 1 18x65 24x50 48 24 74
180 1 21x62 24x50 51 24 71
210 1 21x62 24x50 51 24 71
240 1 24x72 24x50 54 24 81
270 1 24x72 24x50 54 24 81
300 1 24x72 24x50 54 24 81
*Leave a minimum 24 inch clearance to the height of the unit for loading media.
Dimensions are for general arrangement use only.

MGT 30M–300M NXT2 1” SINGLE
SYSTEM INFORMATION
4
SPECIFICATION CHART
SYSTEM SIZE
MODEL 30 45 60 90 120 150 210 240 270 300
VALVE SIZE (IN) 1 1 1 1 1 1 1 1 1 1
MAX CAPACITY (KILOGRAINS) 30 45 60 90 120 150 210 240 270 300
MIN CAPACITY (KILOGRAINS) 20 30 40 60 80 100 140 160 180 200
FLOWRATE (GPM)
CONTINUOUS FLOWRATE (GPM) 14 15 16 17 18 18 18 22 20 18
PEAK FLOWRATE (GPM) 19 20 21 22 23 23 23 30 28 26
BACKWASH & FAST FLUSH (GPM) 2 3 3.5 5 6 8 12 15 15 15
BRINE DRAW & RINSE (GPM) 0.5 1 1 1 1.5 1.5 2.6 3.2 3.2 3.2
BRINE TANK REFILL (GPM) 0.5 1 1 1 1 2 2 2.2 2.2 2.2
TIMER
SETTINGS
BACKWASH & FAST FLUSH (MIN) 10 10 10 10 10 10 10 10 10 10
BRINE DRAW & RINSE (MIN) 60 60 60 60 60 60 60 60 60 60
FAST FLUSH (MIN) 10 10 10 10 10 10 10 10 10 10
BRINE TANK REFILL (MIN) 10 8 10 15 20 13 18 20 22 26
SOFTENER
TANK
SIZE (IN) 9x48 10x54 12x52 14x65 16x65 18x65 21x62 24x72 24x72 24x72
GRAVEL (LBS) 0 0 0 30 35 40 80 120 120 120
RESIN (FT3)1 1-1/2 2 3 4 5 7 8 9 10
FREEBOARD (IN) 25 25 16 21 21 24 18 30 25 21
BRINE SYSTEMS
EQUIPMENT
TANK SIZE 18x33 18x40 18x40 18x40 24x40 24x50 24x50 24x50 24x50 24x50
MAX SALT STORAGE (LBS) 280 320 320 270 550 630 600 550 500 450
INJECTOR CODE 1 3 3 3 4 3C 4C 5C 5C 5C
INJECTOR COLOR WHT YEL YEL YEL GRN YEL GRN WHT WHT WHT
MAX
SALT DOSAGE- MAX (LBS) 15 22.5 30 45 60 75 105 120 135 150
REFILL TIME - MAX (MIN) 10 8 10 15 20 13 18 20 22 26
MIN
SALT DOSAGE- MIN (LBS) 6 12 12 18 24 30 42 48 54 60
REFILL TIME - MIN (MIN) 4 3 4 6 8 5 7 8 10 10
REGENERATION WASTE VOLUME (GAL) 116 116 126 156 188 228 366 520 536 544
NOTES:
1. FLOW RATES
Continuous: pressure loss does not exceed 15 psig.
Peak: pressure loss does not exceed 25 psig
Backwash & Flush: maximum flow to drain
Brine & Rinse: Injector flow to drain
Brine Tank Refill: flow to refill Brine Tank
2. SOFTENER TANK
Freeboard: distance in inches from surface of resin to top sealing flange of tank
3. SALT DOSAGE
Maximum 15 lbs./cu.ft. - regeneration efficiency: 2,000 grains/pound of salt
(factory setting)
Maximum 6 lbs./cu.ft. - regeneration efficiency: 3,000 grains/pound of salt
4. REGENERATION WASTE VOLUME - Total gallons water discharged per
regeneration
5. OPERATING LIMITS:
Minimum operating pressure is 30 psi.
Maximum operating pressure is 120 psi.
Standard units are designed to soften unheated water within the range of
35-100°F.
6. POWER
Power requirements are 120 Volt, 60 Hertz, Single Phase, 2 amps
noninterrupted.
7. SALT
Salt specifications are pelletized or solar salt, 99% pure, containing
less than 1% insolubles (see Brine Tank Installation on page 8)

MGT 30M–300M NXT2 1” SINGLE
INSTALLATION
5
INSTALLATION INSTRUCTIONS WATER SOFTENERS
GENERAL INFORMATION
1. Operating pressure range is 25-100 psi. If pressures over 100 psi are encountered, a regulator must be installed.
Note: The control valve will not operate correctly if feeding into an atmospheric tank. A pressure control device
must be added to the outlet to maintain the minimum pressure.
2. Power requirements are shown on inside cover of the control valve.
3. Standard units are designed to soften unheated water not to exceed 100F. Special valve assemblies are available
to handle heated water supplies exceeding 100 F. Consult factory if applicable.
4. Each softener tank is shipped with distributor manifold and control valve preassembled. Take care when uncrating
and erecting so that no items are damaged.
5. The distributor assembly has been shipped inside the berglass mineral tank. Check to make sure that there is no
damage to the riser pipe, baskets, laterals or hub (if applicable).
Note: A prelter should be used on installations in which free solids are present
LOCATE SOFTENER
1. Select a location that is accessible and near a oor drain that has adequate carrying capacity to handle the
softener backwash ow (see specication table).
2. Erect the softener tank(s) on a concrete or other rm foundation and level.
3. Position the brine tank according to the illustration and supplementary brine tank information. Keep the brine tank
as close as possible to the softener tank(s).
Note: The distance between the softener and brine tanks will affect the brine injector performance, as the distance
increases the injector performance decreases. This may cause an inadequate regeneration. Maximum
recommended distance is 5 ft.
4. A grounded electric receptacle is required for the control valves.

MGT 30M–300M NXT2 1” SINGLE
INSTALLATION
6
BRINE TANK INSTALLATION
The brine tank should be installed on a smooth level surface. If none is available, the tank should be
placed on a smooth piece of exterior plywood and leveled by placing shims underneath the plywood.
Make sure that the salt shelf inside the tank is level and that the brine well is near to vertical as possible.
The brine valve oat is used as a safety overow and should be high on the oat rod. It is not used to stop
the rell. If the oat is near the salt shelf, move the oat up near the top of the valve.
Note: Brine valve assembly will not sit on
bottom of brine tank.
Using the tubing supplied in the brine tank,
connect one end to the brine valve in the
brine tank (“A”) to the brine injector port on
the valve (“B”). There should be an insert
and enough brine tubing to reach from the
brine valve to the control valve. For systems
that use a 1600 brine valve, the tubing will
be 3/8” OD. For systems that use the 1700
brine valve, the tubing will be 1/2” OD. 18
feet of tubing is included with the system.
After connecting the tubing on both ends,
verify that the brine line tubing is not kinked
or restricted.
Run exible tubing (not provided) from the
brine tanks over ow tting to an
appropriate, non-elevated, open drain.
Using a bucket or hose, ll brine tank with
water to about 2” above salt platform. Do not
add salt at this time.
Note:: In the process of making brine for
the rst regeneration, the solution volume
will increase (one gallon of water will be 1.2
gallons of brine). The nal level of the liquid
will be several inches above the platform.
RECOMMENDED TYPES OF SALT
Only puried salt should be used in the brining
system. Palletized salt (“Button”, “Nugget”, and
“Pellet”) or block salt (free binders) is recom-
mended. Do not use granulated salt, as it will fall
through the platform screen.
Rock salt is not normally recommended. Most
rock salt contains sludge-forming insoluble that
collect on the platform and prevents proper
salt-water contact.
Only salt containing 0.5% or less of insolubles
will provide continued satisfactory operation.
If salt with more insolubles is used, the brine
maker will require periodic cleaning.
2 - TOP VIEW OF CONTROL VALVE
1 - BRINE SYSTEM
B
A

MGT 30M–300M NXT2 1” SINGLE
INSTALLATION
7
MOUNTING WATER METER ASSEMBLY (IF UNIT IS NOT SKID MOUNTED)
1. Locate the meter. The meter may or many not have the cable attached. If not, locate the cable as well.
2. The meter must be installed in the outlet of the water softener. Refer to the General Arrangement drawing on page
two (2). The water meter has a ow arrow stamped on it. The ow arrow on the meter should be pointing away
from the softeners.
3. After installing the meter, insert the meter end of the cable into the meter dome if necessary. Then run the meter
cable along the piping back to the unit 1 control valve.
4. Run the cable through a cable grip and into the back of the control and into the controller. Connect the meter cable
to the circuit board in the lower right as shown.
COMMUNICATION PORTS
FLOW METER CONNECTION