MARLO SXT Series User manual

MGT 15M – 30M
SINGLE METERED 3/4” SXT SERIES
SYSTEM 4
COMMERCIAL WATER CONDITIONER
MODELS FROM JULY 2014
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
MODEL NO:
SERIAL NO:
DATE INSTALLED:
DEALER:
COMPLETE FOR FUTURE REFERENCE:
Marlo Incorporated
2227 South Street
P.O. Box 044170
Racine, WI 53404-7003
Ph. [phone]
Fax [phone]
[email protected]
www.Marlo-Inc.com
8-611

MGT 15 – 30 3/4” SXT SINGLE
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
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

MGT 15 – 30 3/4” SXT SINGLE
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
TABLE OF CONTENTS
SYSTEM INFORMATION
Product Warranty...........................................................................................................................................................1
General Arrangement Drawing .....................................................................................................................................2
Dimensional Data .........................................................................................................................................................4
Specication Table ........................................................................................................................................................5
Aux Switch (Optional)....................................................................................................................................................6
INSTALLATION
General Information.......................................................................................................................................................8
Loading Softener ..........................................................................................................................................................9
Mounting Control Valve ..............................................................................................................................................10
Piping Installation .......................................................................................................................................................10
OPERATION
Start-Up Procedure ..................................................................................................................................................... 11
Timer Features ...........................................................................................................................................................12
Controller Operation ...................................................................................................................................................13
Master Programming Chart ........................................................................................................................................15
Master Programming Mode ........................................................................................................................................16
User Programming Mode ...........................................................................................................................................21
Diagnostic Programming Mode ..................................................................................................................................22
MAINTENANCE
Wiring Diagram ...........................................................................................................................................................24
Timer Assemblies ........................................................................................................................................................25
Powerhead Assembly .................................................................................................................................................26
Control Valve Assembly...............................................................................................................................................27
Turbine Meter ..............................................................................................................................................................29
Brine Injector Assemblies ...........................................................................................................................................30
Bypass Valve Assembly...............................................................................................................................................31
Brine Tank Assemblies ...............................................................................................................................................32
Service Assemblies ....................................................................................................................................................33
Troubleshooting...........................................................................................................................................................34

MGT 15 – 30 3/4” SXT SINGLE
TERMS & CONDITIONS
1
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
Ordering:
Orders may be phoned, faxed, or emailed to Marlo Incorporated Purchase
orders must include Marlo Incorporated part numbers and pricing.
Purchase orders must also state if partial shipments are allowed. If you do
not have the correct part numbers, pricing, or case quantities, please con-
tact our customer service department.
Order Confirmations:
All purchase orders will be confirmed by phone, fax, or email. Any discrep-
ancies in part numbers, pricing, descriptions, or case quantities will be
listed in the order confirmation. It is the customer’s responsibility to review
the order confirmations and advise if any changes are to be made. If we
do not hear from the customer regarding the confirmation within 24 hours,
we will assume everything is correct and will invoice and ship accordingly.
Quotes & Prices:
Quotations are valid for a period of up to 45 days or for the term stated
on the quote, whichever term is shortest. We make every effort to notify
customers with price change information. However, prices are subject to
change or correction without notice. Shipping weights, dimensions and
anticipated ship dates are all approximate and subject to change.
Minimum Orders:
Minimum order accepted is $25.00, not including freight or taxes.
Taxes:
Taxes are not included. Quoted prices are exclusive of all taxes.
Purchaser shall be responsible for payment of all applicable state/local
taxes. Orders shipped within Wisconsin are subject to applicable state tax
rates unless a completed resellers card or exempt certificate is on file.
Freight:
All shipments are F.O.B. Marlo Incorporated Racine, Wisconsin, unless
otherwise specified.
Shipment:
The shipment method should be specified by the customer on the pur-
chase order; otherwise, Marlo Incorporated will choose the best method of
shipment.
Packaging:
Pricing includes packaging that is satisfactory for air, truck, or container-
ized shipment at no additional cost, unless otherwise stated. Ocean export
crating will require an additional charge.
Terms - Domestic Customers:
Terms of payment on open accounts are net 30 days from the date of
invoice, unless otherwise stated and mutually agreed upon by both par-
ties. This agreement is subject to credit approval. Terms will only be
issued to companies which reside in the United States of America. Orders
will not be shipped if any account is past due and/or until payment by
check has cleared.
Orders in excess of $60,000 will require partial payments prior to ship-
ment. A specific progress payment schedule will be stated in the quotation.
Partial payments may also be required for orders involving special engi-
neering or custom ordered items regardless of order amount.
Interest will be charged on past due accounts. Interest charges will be
calculated on the unpaid balance at 1.5% per month. All questions regard-
ing invoices and terms must be addressed with our accounting department
before invoices become due.
Unless specifically included as a separate item, prices quoted do not
include any city, county, state or federal taxes, or transportation of
merchandise.
Terms - International Customers:
All payments due are in U.S. dollars and must be made in advance by
check (must clear before shipment), money orders, wire transfer, or credit
card. Credit cards that are accepted are Visa, MasterCard, and American
Express. Irrevocable Letters of Credit are accepted with a minimum order
of $25,000.00 U.S. dollars, per order. Unless specifically included as a
separate item, prices quoted do not include any city, county, state or fed-
eral taxes, or transportation of merchandise. A deposit may be required for
special or custom ordered items.
Freight Claims:
Any damage, discrepancies and/or freight claims must be made immedi-
ately and directly, in writing within ten (10) days to Marlo Incorporated. Marlo
Incorporated will help as much as possible in settling claims. However, Marlo
Incorporated will not be held responsible for breakage or shortage after prod-
ucts are accepted by common carrier. All shipments must be inspected for
damages and counted for shortages at the time of delivery.
Order Changes:
Additions to an order may be made at no charge prior to the processing of
an order. Processing of an order typically begins within one hour of receipt
of a purchase order and is typically accomplished within one working day.
Orders cancelled after the order has been processed and sent to shipping
or engineering, will be subject to a minimum 10% cancellation fee, assum-
ing manufacturing has not commenced, and no detailed engineering or
special parts have been ordered. Additional fees may be charged depend-
ing on the level of completion of detailed engineering, manufacturing,
and/or if any special parts have been ordered.
Returns & Restocking:
A Return Goods Authorization (RGA) number must be obtained from Marlo
Incorporated before any product returns can be accepted and/or replace-
ments shipped. All returns for warranty consideration are to be shipped
prepaid and must be returned within ten (10) business days from the
RGA issuance. Returns determined to be in warranty will be replaced or
repaired and will be returned to Buyer prepaid. Products returned, other
than valid warranty claims, may be subject to a restocking charge of up to
25%. Orders shipped incorrectly by Marlo Incorporated are not subject to
restocking charges and correct items will be shipped to Buyer prepaid.
Excusable Delays:
Marlo Incorporated shall not be in default for failure to deliver or delay
in delivery arising out of causes beyond its control and without its negli-
gence, including but not limited to Acts of God or the public enemy; acts
of the Government in either its sovereign or contractual capacity; fires;
floods; epidemics; quarantine restrictions; strikes; shortages of materials
or supplies; labor disputes; freight embargoes; delays in transit; consign-
ments lost or damaged by freight agent(s); and unusually severe weather.
Warranty:
Marlo Incorporated warrants its products to be free from defects in design,
material, or workmanship for a period of 18 months from shipment date
or 12 months from installation, whichever occurs first, when said products
are installed and operated in accordance with the written instructions pro-
vided. The fiberglass reinforced polyester (FRP) resin/media tanks used
in certain products alone have an extended warranty period of five (5)
years from the shipment date. If within that period any products shall be
proven to Marlo, Inc.’s satisfaction to be defective, those products will be
replaced, or the price refunded at Marlo Inc.’s option. Marlo Inc.’s obliga-
tions or nonperformance, defective, 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 Marlo Inc.’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
implied warranty (except of title) including but not limited to implied war-
ranty of merchantability and fitness for particular purpose.
Marlo Inc. 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 negli-
gence and strict liability) or arising under other theories of law with respect
to products sold or services rendered by Marlo Inc. or any undertakings,
acts, or omissions relating thereto.
3. All consequential, incidental, and contingent damages including labor
charges, back charges or handling charges are excluded from Marlo Inc.’s
warranty provisions.
Policy:
These terms and conditions may be superseded by specific provisions
provided by Marlo Incorporated. However, should any of these terms and
conditions be contrary to or inconsistent with any terms and conditions
contained in any purchase order form or other document between Marlo
Incorporated and the buyer, which is prepared by the buyer and whenever
executed, the provisions hereof shall be controlling and shall supersede
the conflicting terms and conditions which are contained in such other
document. No changes shall be made to our terms and conditions unless
prior written authorization by Marlo Incorporated

MGT 15 – 30 3/4” SXT SINGLE
SYSTEM INFORMATION
2
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
1 1
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3 3
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A A B B C C
D D
DATE
FRAC.
DRN.
APP'D.
`
DEC.
`
DRAWING NO.
SCALE FILE ID.
SHEET
REV.
OF
MGT-15-3/4 SGL - TC
GENERAL ARRANGEMENT
C182AA000000
11
Anthony
5/12/2014
REVISIONS
NO. BY REMARKS
INCORPORATED
DATE
7" DIA X 44" HIGH
RESIN TANK
18" DIA X 33" HIGH
BRINE TANK
3/4" WATER INLET 30-100 PSIG
BY-PASS VALVE (NORMALLY CLOSED)
36"
3/4" WATER OUTLET
NOTES: 1. ALL PIPING, FITTINGS, ETC SHOWN WITH DASHED LINES ARE PROVIDED BY OTHERS.
2. GENERAL PLUMBING CONNECTIONS ARE SHOWN FOR
CLARITY
ONLY
.
3. OVERALL HEIGHT IS FOR REFFERENCE ONLY. ACTUAL
HEIGHT MAY VARY BASED ON TANK PROVIDED.
ALLOW 36" FOR
RESIN LOADING
OVERFLOW
TO DRAIN
53 1/8( ")
REF. SEE
NOTE 3

MGT 15 – 30 3/4” SXT SINGLE
SYSTEM INFORMATION
3
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
A A B B C C
D D
DATE
FRAC.
DRN.
APP'D.
`
DEC.
`
DRAWING NO.
SCALE FILE ID.
SHEET
REV.
OF
MGT-30-3/4 SGL - TC
GENERAL ARRANGEMENT
C182AC000000
11
Anthony
5/12/2014
REVISIONS
NO. BY REMARKS
INCORPORATED
DATE
9" DIA X 48" HIGH
RESIN TANK
18" DIA X 33" HIGH
BRINE TANK
3/4" WATER INLET 30-100 PSIG
BY-PASS VALVE (NORMALLY CLOSED)
36"
3/4" WATER OUTLET
NOTES: 1. ALL PIPING, FITTINGS, ETC SHOWN WITH DASHED LINES ARE PROVIDED BY OTHERS.
2. GENERAL PLUMBING CONNECTIONS ARE SHOWN FOR
CLARITY
ONLY
.
3. OVERALL HEIGHT IS FOR REFFERENCE ONLY. ACTUAL
HEIGHT MAY VARY BASED ON TANK PROVIDED.
ALLOW 36" FOR
RESIN LOADING
OVERFLOW
TO DRAIN
57( ")
REF. SEE
NOTE 3

MGT 15 – 30 3/4” SXT SINGLE
SYSTEM INFORMATION
4
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
DIMENSION CHART
MODEL INLET SIZE
(Inches)
TANK SIZE LENGTH
(Inches)
WIDTH
(Inches)
HEIGHT*
(Inches)
SOFTENER
(Inches)
BRINE
(Inches)
15 3/4 7x44 18x33 31 18 53
30 3/4 9x48 18x33 33 18 57
*Leave a minimum 24 inch clearance to the height of the unit for loading media.
Dimensions are for general arrangement use only.

MGT 15 – 30 3/4” SXT SINGLE
SYSTEM INFORMATION
5
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
SPECIFICATION CHART
SYSTEM SIZE
MODEL 15 30
VALVE SIZE (IN) 3/4 3/4
MAX CAPACITY (KILOGRAINS) 15 30
MIN CAPACITY (KILOGRAINS) 10 20
FLOWRATE (GPM)
CONTINUOUS FLOWRATE (GPM) 7 10
PEAK FLOWRATE (GPM) 10 14
BACKWASH & FAST FLUSH (GPM) 1.2 2
BRINE DRAW & RINSE (GPM) 0.4 .51
BRINE TANK REFILL (GPM) .25 .5
TIMER
SETTINGS
BACKWASH & FAST FLUSH (MIN) 10 10
BRINE DRAW & RINSE (MIN) 60 60
FAST FLUSH (MIN) 10 10
BRINE TANK REFILL (MIN) 8 8
SOFTENER
TANK
SIZE (IN) 7x44 9x48
GRAVEL (LBS) 0 0
RESIN (FT3)0.5 1
FREEBOARD (IN) 17 25
BRINE SYSTEMS
EQUIPMENT
TANK SIZE 18x33 18x33
MAX SALT STORAGE (LBS) 280 280
INJECTOR CODE 0 1
INJECTOR COLOR RED WHT
MAX
SALT DOSAGE- MAX (LBS) 7.5 15
REFILL TIME - MAX (MIN) 10 10
MIN
SALT DOSAGE- MIN (LBS) 3 6
REFILL TIME - MIN (MIN) 4 4
REGENERATION WASTE VOLUME (GAL) 40 116
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

MGT 15 – 30 3/4” SXT SINGLE
SYSTEM INFORMATION
6
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
AUX SWITCH (OPTIONAL)
The Aux Switch Option provides an extra switch on the brine valve cam assembly that ties to the terminal strip located
on the back-plate of the valve. The switch provides a dry contact circuit that changes status dependent on lter valve’s
step. It is most commonly used to lockout an RO activate a pump, or activate separate source inlet
valves.
The switch is normally closed during service and normally open during regeneration.
Contact Rating: 220 VAC Max. / 2.0 AMP Max.
AUX SWITCH
TERMINAL BLOCK
STEP
DRY CONTACT STATUS
OPEN CLOSED
SERVICE 20-21 20-22
BACKWASH/ / REGENERATION 20-22 20-21

MGT 15 – 30 3/4” SXT SINGLE
SYSTEM INFORMATION
7
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
AUX SWITCH (OPTIONAL)
AUX SWITCH RO LOCKOUT - WIRING

MGT 15 – 30 3/4” SXT SINGLE
INSTALLATION
8
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
INSTALLATION INSTRUCTIONS
GENERAL INFORMATION
1. Operating pressure range is 30-100 psi. If pressures over 100 psi are encountered, a regulator must be installed.
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).
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.
4. A grounded electric receptacle is required for the control valves.

MGT 15 – 30 3/4” SXT SINGLE
INSTALLATION
9
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
LOADING TANK
1. On Model MGT - 15, 30, 45 and 60 the softening media has been pre-loaded at the factory. Skip this section and
go to “Mount Control Valve Assembly”.
2. Fill tank(s) approximately 1/3 full of water using a hose, bucket, etc. Plug the PVC distributor manifold pipe using a
plastic cap, cork, rag, etc. NO gravel or resin should go into this distributor manifold pipe.
3. Verify the distributor manifold is center in the tank with the distributor resting on the bottom of the tank. Verify the
riser pipe is still plugged.
NOTE: Reference the specication table in the front of this manual for the correct quantities of gravel and resin. Note
that these quantities are for each tank. Make sure you have the required amounts on site before you begin.
4. With care not to damage any lateral, pour in the gravel provided for each tank through the top opening in the tank
and level out evenly. This will cover the distributor assembly.
NOTE: Wetting the gravel in the bags before loading will eliminate the normal amount of dust.
5. When gravel is loaded and leveling is completed, proceed as follows:
6. With the distributor riser pipe still plugged, add the proper amount of resin supplied for each tank through the top
opening in the tank.
Caution: The softener resin is very slippery. Take care when stepping on any spilled resin. Remove spilled resin from
standing surface immediately.
7. When loading is complete, remove plastic cap, cork, or rag that was used to plug the distributor riser pipe. Be
careful not to let any foreign debris fall into the pipe. The result could be damage to system.
8. Repeat instruction steps 1-7 for each softener tank (if applicable).

MGT 15 – 30 3/4” SXT SINGLE
INSTALLATION
10
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
MOUNT CONTROL VALVE ASSEMBLY
1. Verify that the distributor riser pipe is not plugged.
2. Lubricate the distributor o’ring on the bottom of the control valve with silicone.
3. Insert disperser in threaded base of control valve. The threaded base has a groove machined into the inside of the
threaded part of the base to allow for the installation of this disperser.
4. Screw control valve into top opening of tank making sure the distributor riser pipe slides easily through the
distributor o’ring. Care must be taken not to “nick” this o-ring as hard water leakage could result.
5. Tighten down the control valve to ensure positive o-ring seal at top of tank.
6. Repeat instruction steps 1-5 for each softener tank (if applicable).
INSTALLATION OF CONNECTION PIPING
NOTE:
• Use thread sealing tape on all threaded piping connections.
• Install the piping conforming to federal, provincial, and local codes.
• Union or anges are recommended at the control valve’s inlet, outlet, and drain connections
• To enhance the monitoring of the system’s performance sample valves and pressure gauges can be installed at
the inlet and outlet piping to each control valve.
• If distance of drain line is over a 10 ft. vertical or 25 ft. horizontal run, increase drain line one pipe size over that
provided on the control valve.
• Do not make a direct connection to the drain. Provide an air gap of at least four times the diameter of the pipe to
conform to sanitation codes and to permit observation of the ow.
• It is not recommended that an overhead or a long horizontal drain run be used. The increase of backpressure will
cause problems when drawing brine.
Caution: All piping must be properly supported. The tank and valve assemblies are not meant to support the
connecting piping.
1. Install piping as shown on installation diagram. It is recommended that unions be installed on inlet and outlet
connections to facilitate service of unit. Be sure piping is free of thread chips and other foreign matter. The
connecting piping should be the same size or larger then the service inlet and outlet of the control valve. On
multiple units that are both in service at the same time the common service inlet and outlet headers should be
up-sized to accommodate the total ow
2. Verify that the ow arrow stamped on the ow controller is pointing away from the control valve. See installation
diagram or valve manual for the location. Install a drain line from backwash control assembly to an
appropriate drain using a minimum of elbows. Install a union near the backwash control to facilitate cleaning. Do
not install a valve on the drain line.
3. Connect the brine line tubing to the softener(s) and to the brine tank. Verify that the brine line tubing is not kinked
or restricted.
4. Run exible tubing from the brine tank over ow tting to an appropriate, non-elevated, open drain.

MGT 15 – 30 3/4” SXT SINGLE
OPERATION
11
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
START-UP PROCEDURES
Again, make sure all plumbing is complete and tight, including drain line and brine line. Make sure all electrical
components, including the communication cables (multi tank systems only) are properly installed and connected.
1. Using a bucket or hose, ll brine tank with water to 2” above salt platform. Do not add salt at this time.
2. Make sure inlet and outlet isolation valves are closed, and then turn on power to the system.
Note: Start up only one (1) tank at a time.
3. Open the manual bypass valve. The manual inlet and outlet valves are to remain closed.
4. Connect electrical power to the control valve by plugging in the valve. Once the valve is powered it will drive to the
service position.
5. Program the SXT controller. The water hardness, day override, time of regeneration, and time of day will need to
be set on site to the desired settings. (Refer to the User Mode Programming section of the manual.) The softener
settings are pre-programmed at the factory. Instructions for changing these settings are in the Master
Programming Guide section.
6. Locate the extra regeneration button on the front side of the timer. Press the button for 5 seconds. The
softener control valve will advance to Backwash position. Be patient this will take several minutes.
7. Remove electrical power from unit, and then slowly open inlet water valve approximately half open. Water will
begin to ll through bottom distributor into tank. When tank is full, water will begin to ow out of drain line. Slowly
open inlet valve until full open. Allow water to ow from drain line for approximately 15 minutes.Warning: Monitor
this drain water ow carefully. There is a problem if you see softener resin in the drain water. Turn off inlet water
immediately and then consult factory.
8. Restore electrical power to unit. Advance the control valve to Brine Draw / Slow Rinse position, using the same
method as step 5. Make sure unit draws water from brine tank. There should also be reduced ow at the
drain line.
9. Advance the control valve to the Fast Rinse position. Remove electrical power to the unit. Let water run to drain
position for approximately 5 minutes or until water runs clear.
10. Restore electrical power to unit. Advance the control valve to Brine Rell position. Water should begin to rell
brine tank. Allow the brine tank to rell until water in salt tank is again 2” above the salt platform. There should be
no ow to drain in this valve position.
11. Advance control valve to Service position. Brine tank rell should stop. Open outlet valve and run water at the
nearest cold water faucet to the water softener system for
12. Repeat instruction steps 1-10 for each softener tank.
13. Add salt to the brine tank. Use pelletized or solid salt, 99.0 – 99.8% pure salt containing less than
0.5% insoluble.
14. Use the test kit provided to check water for softness. Check the water hardness daily the rst week in order to
establish how often the softener should be regenerated. approximately 5 minutes.

MGT 15 – 30 3/4” SXT SINGLE
OPERATION
12
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
TIMER FEATURES
FEATURES OF THE SXT:
• Power backup that continues to keep time and the passage of days for a minimum of 48 hours in the event of
power failure. During a power outage, the control goes into a power-saving mode. It does not monitor water usage
during a power failure, but it does store the volume remaining at the time of power failure.
• Settings for both valve (basic system) and control type (method used to trigger a regeneration).
• Day-of-the-Week controls.
• While in service, the display alternates between time of day, volume remaining or days to regeneration, and tank
in service (twin tank systems only).
• The Flow Indicator ashes when outlet ow is detected.
• The Service Icon ashes if a regeneration cycle has been queued.
• A Regeneration can be triggered immediately by pressing the Extra Cycle button for ve seconds.
• The Parameter Display displays the current Cycle Step (BW, BF, RR, etc) during regeneration, and the data
display counts down the time remaining for that cycle step. While the valve is transferring to a new cycle step,
the display will ash. The parameter display will identify the destination cycle step (BW, BF, RR, etc) and the data
display will read “----”. Once the valve reaches the cycle step, the display will stop ashing and the data display
will change to the time remaining. During regeneration, the user can force the control to advance to the next cycle
step immediately by pressing the extra cycle button.
Parameter
Display
Data
Display
PM
Indicator
Flow Indicator
x1000 Indicator
Service
Icon
Programming
Icon
Extra Cycle
Button
Up
Button
Down
Button
Error/
Information
Icon

MGT 15 – 30 3/4” SXT SINGLE
OPERATION
13
Phone: [phone] • Web: www.Marlo-Inc.com • E-mail: [email protected]
TIMER FEATURES
SETTING THE TIME OF DAY
1. Press and hold either the Up or Down buttons until the programming icon replaces the service icon and the
parameter display reads TD.
2. Adjust the displayed time with the Up and Down buttons.When the desired time is set, press the Extra Cycle
button to resume normal operation. The unit will also return to normal operation after 5 seconds if no buttons
are pressed.
ENTERING MASTER PROGRAMMING MODE
Set the Time Of Day display to 12:01 P.M. Press the Extra Cycle button (to exit Setting Time of Day mode). Then
press and hold the Up and Down buttons together until the programming icon replaces the service icon and the Dis-
play Format screen appears.
EXITING MASTER PROGRAMMING MODE
Press the Extra Cycle button to accept the displayed settings and cycle to the next parameter. Press the Extra Cycle
button at the last parameter to save all settings and return to normal operation. The control will automatically disre-
gard any programming changes and return to normal operation if it is left in Master Programming mode for 5 minutes
without any keypad input.
RESETS
Soft Reset: Press and hold the Extra Cycle and Down buttons for 25 seconds while in normal Service mode. This
resets all parameters to the system default values, except the volume remaining in meter immediate
or meter delayed systems and days since regeneration in the time clock system.
Master Reset: Hold the Extra Cycle button while powering up the unit. This resets all of the parameters in the unit.
Check and verify the choices selected in Master Programming Mode.
CONTROLLER OPERATION
METER IMMEDIATE CONTROL
A meter immediate control measures water usage and regenerates the system as soon as the calculated system
capacity is depleted. The control calculates the system capacity by dividing the unit capacity (typically expressed in
grains/unit volume) by the feedwater hardness and subtracting the reserve. Meter Immediate systems generally do
not use a reserve volume. However, in twin tank systems with soft-water regeneration, the reserve capacity should be
set to the volume of water used during regeneration to prevent hard water break-through. A Meter Immediate control
will also start a regeneration cycle at the programmed regeneration time if a number of days equal to the regeneration
day override pass before water usage depletes the calculated system capacity.
METER DELAYED CONTROL
A Meter Delayed Control measures water usage and regenerates the system at the programmed regeneration time
after the calculated system capacity is depleted. As with Meter Immediate systems, the control calculates the system
capacity by dividing the unit capacity by the feedwater hardness and subtracting the reserve. The reserve should be
set to insure that the system delivers treated water between the time the system capacity is depleted and the actual
regeneration time. A Meter Delayed control will also start a regeneration cycle at the programmed regeneration time
if a number of days equal to the regeneration day override pass before water usage depletes the calculated system
capacity.
TIME CLOCK DELAYED CONTROL
A Time Clock Delayed Control regenerates the system on a timed interval. The control will initiate a regeneration cycle
at the programmed regeneration time when the number of days since the last regeneration equals the regeneration
day override value.

MGT 15 – 30 3/4” SXT SINGLE
OPERATION
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CONTROLLER OPERATION (continued)
DAY OF THE WEEK CONTROL
This control regenerates the system on a weekly schedule. The schedule is dened in Master Programming by setting
each day to either “off” or “on.” The control will initiates a regeneration cycle on days that have been set to “on” at the
specied regeneration time.
CONTROL OPERATION DURING REGENERATION
During regeneration, the control displays a special regeneration display. In this display, the control shows the current
regeneration step number the valve is advancing to, or has reached, and the time remaining in that step. The step
number that displays ashes until the valve completes driving to this regeneration step position. Once all regeneration
steps are complete the valve returns to service and resumes normal operation.
Pressing the Extra Cycle button during a regeneration cycle immediately advances the valve to the next cycle step
position and resumes normal step timing.
CONTROL OPERATION DURING PROGRAMMING
The control only enters the Program Mode with the valve in service. While in the Program Mode, the control contin-
ues to operate normally monitoring water usage and keeping all displays up to date. Control programming is stored in
memory permanently, eliminating the need for battery backup power.
MANUALLY INITIATING A REGENERATION
1. When timer is in service, press the Extra Cycle button for 5 seconds on the main screen.
2. The timer advances to Regeneration Cycle Step #1 (backwash), and begins programmed time count down.
3. Press the Extra Cycle button once to advance valve to Regeneration Cycle Step #2 (brine draw & slow rinse).
4. Press the Extra Cycle button once to advance valve to Regeneration Cycle Step #3 (rapid rinse).
5. Press the Extra Cycle button once to advance valve to Regeneration Cycle Step #4 (brine rell).
6. Press the Extra Cycle button once more to advance the valve back to in service.
NOTE: If the unit is a lter or upow, the cycle step order may change.
NOTE: A queued regeneration can be initiated by pressing the Extra Cycle button. To clear a queued regener-ation,
press the Extra Cycle button again to cancel. If regeneration occurs for any reason prior to the delayed regeneration
time, the manual regeneration request shall be cleared.
TIMER FEATURES
CONTROL OPERATION DURING A POWER FAILURE
The SXT includes integral power backup. In the event of power failure, the control shifts into a power-saving mode.
The control stops monitoring water usage, and the display and motor shut down, but it continues to keep track of the
time and day for a minimum of 48 hours.
The system conguration settings are stored in a non-volatile memory and are stored indenitely with or without line
power. The Time of Day ashes when there has been a power failure. Press any button to stop the Time of Day from
ashing.
If power fails while the unit is in regeneration, the control will save the current valve position before it shuts down.
When power is restored, the control will resume the regeneration cycle from the point where power failed. Note that
if power fails during a regeneration cycle, the valve will remain in it’s current position until power is restored. The
valve system should include all required safety components to prevent overows resulting from a power failure during
regeneration.
The control will not start a new regeneration cycle without line power. If the valve misses a scheduled regeneration
due to a power failure, it will queue a regeneration. Once power is restored, the control will initiate a regeneration
cycle the next time that the Time of Day equals the programmed regeneration time. Typically, this means that the
valve will regenerate one day after it was originally scheduled. If the treated water output is important and power inter-
ruptions are expected, the system should be setup with a sufcient reserve capacity to compensate for regeneration
delays.

MGT 15 – 30 3/4” SXT SINGLE
OPERATION
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MASTER PROGRAMMING MODE CHART
Master Programming Options
Abbreviation Parameter Option
Abbreviation
Options Entered
Values
DF Display Format GAL ╪Gallons
Ltr Liters
VT Valve Type
dF1b ╪Standard Downow/Upow Single Backwash
dF2b Standard Downow/Upow Double Backwash
Fltr Filter
UFbd Upow Brine First
UFtr Upow Filter
Othr Other
CT Control Type
Fd Meter (Flow) Delayed
FI ╪Meter (Flow) Immediate
tc Time Clock
dAY Day of Week
NT Number of Tanks 1 Single Tank System
2 ╪Two Tank System
TS Tank in Service
U1 ╪Tank 1 in Service
U2 Tank 2 in Service
C Unit Capacity Unit Capacity (Grains)
HFeedwater
Hardness
Hardness of Inlet Water
RS Reserve Selection SF ╪Percentage Safety Factor
rc Fixed Reserve Capacity
SF Safety Factor Percentage of the system capacity to be used as a
reserve
RC Fixed Reserve
Capacity
Fixed volume to be used as a reserve
DO Day Override The system’s day override setting
RT Regen Time The time of day the system will regenerate
BW, BD, RR,
BF
Regen Cycle Step
Times
BW: 10
BD: 10
RR: 10
BF: See Note
10
The time duration for each regeneration step. Adjust-
able from OFF and 0-199 minutes.
NOTE: If “Othr” is chosen under “Valve Type”, then
R1, R2, R3, etc, will be displayed instead
D1, D2, D3, D4,
D5, D6, & D7
Day of Week
Settings
Regeneration setting (On or OFF) for each day of the
week on day-of-week systems
CD Current Day The Current day of the week
FM Flow Meter Type
t0.7 3/4” Turbine Meter
P0.7 3/4” Paddle Wheel Meter
t1.0 1” Turbine Meter
P1.0 1” Paddle Wheel Meter
t1.5 1.5” Turbine Meter
P1.5 1.5” Paddle Wheel Meter
Gen
*
Generic or Other Meter - Enter K-value below
P2.0 2” Paddle Wheel Meter
K Meter Pulse Setting Meter pulses per gallon for generic/other ow meter
* Refer to programming guide for optional (generic) meter types and K-values
╪Indicates factory setting
NOTE:
Some items may not be shown depending on timer conguration.
The timer will discard any changes and exit Master Programming Mode if any button is not pressed for sixty seconds.
BF Setting: Refer to specication table for recommended cycle times by model #.
CAUTION: Before entering Master Programming, please contact your local professional water dealer.

MGT 15 – 30 3/4” SXT SINGLE
MAINTENANCE
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MASTER PROGRAMMING MODE
ENTERING MASTER PROGRAMMING MODE
Set the Time Of Day display to 12:01 P.M. Press the Extra Cycle button (to exit Setting Time of Day mode). Then
press and hold the Up and Down buttons together until the programming icon replaces the service icon and the Dis-
play Format screen appears.
When the Master Programming Mode is entered, all available option setting displays may be viewed and set as
needed. Depending on current option settings, some parameters cannot be viewed or set.
1. Display Format (Display Code DF)
This is the rst screen that appears when entering Master Programming Mode. The Display Format setting
species the unit of measure that will be used for volume and how the control will display the Time of Day. This
option setting is identied by “DF” in the upper left hand corner of the screen. There are three possible settings:
2. Valve Type (Display Code VT)
Press the Extra Cycle button. Use this display to set the Valve Type. The Valve Type setting species the type of
cycle that the valve follows during regeneration. Note that some valve types require that the valve be built with
specic subcomponents. Ensure the valve is congured properly before changing the Valve Type setting. This
option setting is identied by “VT” in the upper left hand corner of the screen. There are 5 possible settings:
3. Control Type (Display Code CT)
Press the Extra Cycle button. Use this display to set the Control Type. This species how the control determines
when to trigger a regeneration. For details on how the various options function, refer to the “Timer Operation”
section of this service manual. This option setting is identied by “CT” in the upper left hand corner of the screen.
There are four possible settings:
Meter Delayed: Fd
Meter Immediate: FI
Time Clock: tc
Day of Week: dAY
DISPLAY FORMAT SETTING UNIT OF VOLUME TIME OF DISPLAY
GAL U.S. Gallons 12-hour AM/PM
Ltr Liters 24-Hour
Cu Cubic Meters 24-Hour
ABBREVIATION PARAMETER
St1b Standard Downflow/Upflow, Single Backwash
St2b Standard Downflow/Upflow, Double Backwash
Fltr Filter
UFbF Upflow Brine First
Othr Other

MGT 15 – 30 3/4” SXT SINGLE
MAINTENANCE
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MASTER PROGRAMMING MODE (continued)
4. Number of Tanks (Display Code NT)
Press the Extra Cycle button. Use this display to set the Number of Tanks in your system. This option setting is
identied by “NT” in the upper left hand corner of the screen. There are two possible settings:
Single Tank System: 1
Two-Tank System: 2
5. Tank in Service (Display Code TS)
Press the Extra Cycle button. Use this display to set whether tank one or tank two is in service. This option setting
is identied by “TS” in the upper left hand corner of the screen. This parameter is only available if the number of
tanks has been set to 2. There are two possible settings:
Tank One in Service: U1
Tank Two in Service: U2
6. Unit Capacity (Display Code C)
Press the Extra Cycle button. Use this display to set the Unit Capacity. This setting species the treatment capacity
of the system media. Enter the capacity of the media bed in grains of hardness when conguring a softener
system, and in the desired volume capacity when conguring a lter system. This option setting is identied by
“C” in the upper left hand corner of the screen. The Unit Capacity parameter is only available if the control type
has been set to one of the metered options. Use the Up and Down buttons to adjust the value as needed.
7. Feedwater Hardness (Display Code H)
Press the Extra Cycle button. Use this display to set the Feedwater Hardness. Enter the feedwater hardness in
grains per unit volume for softener systems, or 1 for lter systems. This option setting is identied by “H” in the
upper left hand corner of the screen. The feedwater hardness parameter is only available if the control type has
been set to one of the metered options. Use the Up and Down buttons to adjust the value as needed.
rapid rinse
brine fill
stand-by
tank two
tank one
backwash
brine rinse
CAUTION: Before entering Master Programming, please contact your local professional water dealer.