Watts ProSense User Manual

Instructions for Installing ProSense

Twin Alternating Water Softening Systems

Service Manual

IOM-WQ-PROSENSE

TABLE OF CONTENTS

JOB SPECIFICATION SHEET ...............................................1

EQUIPMENT CONFIGURATION ...........................................1

SAFETY INFORMATION ........................................................2

HOW TO USE THIS MANUAL ...............................................2

GENERAL AND COMMERCIAL INSTALLATION

INSTRUCTIONS .....................................................................2

CONTROLLER FEATURES ...................................................4

PLACING WATER CONDITIONING SYSTEM INTO

OPERATION ...........................................................................5

PROGRAMMING MODE ........................................................6

DISINFECTION OF WATER CONDITIONING SYSTEMS .....11

WIRING DIAGRAMS ..............................................................12

POWERHEAD ASSEMBLY ....................................................13

ProSense CONTROL VALVE ASSEMBLY .............................14

ProSense SECOND TANK ASSEMBLY .................................15

3/4" METER ASSEMBLY ........................................................16

1" METER ASSEMBLY ...........................................................17

ProSense BYPASS VALVE ASSEMBLY .................................18

BYPASS VALVE ASSEMBLY .................................................19

PROBE KIT ............................................................................20

TROUBLESHOOTING ...........................................................21

ProSense METER FLOW DATA .............................................23

ProSense INJECTOR FLOW DATA

(1600 SERIES INJECTORS) ..................................................24

ProSense CONTROL DIMENSIONS .....................................25

WATER CONDITIONER FLOW DIAGRAMS .........................26

SERVICE ASSEMBLIES ........................................................28

JOB SPECIFICATION SHEET

Job No: ___________________________________________

Model No: _________________________________________

Water Test: _________________________________________

Capacity Per Unit: ___________________________________

Mineral Tank

Size: ____________Diameter: __________ Height: _________

Brine Tank Size and Salt Setting per Regeneration: _________

ProSense Control Valve Specications:

1. Timer Gallon Setting:________________________ Gallons

2. Regeneration Program Setting:

a. Brine and Slow Rinse: _____________________Minutes

b. Backwash: ______________________________Minutes

c. Rapid Rinse: _____________________________Minutes

d. Brine Tank Rell: _________________________Minutes

3. Drain Line Flow Control: _______________________ gpm

4. Brine Rell Rate: _____________________________ gpm

5. Injector Size: ____________________________________

EQUIPMENT CONFIGURATION

ProSense Water Softener Conguration

Figure 1

SAFETY INFORMATION

This water conditioner’s control valve conforms to UL/CE

Standards. Generic valves were tested and certied for compliance as veried by the agency listing.

• Please review the entire Installation and Operation

Manual before installing the water conditioning system.

• As with all plumbing projects, it is recommended that a trained professional water treatment dealer install the water conditioning system. Please follow all local plumbing codes for installing this water conditioning system.

• This system will not make microbiologically unsafe water safe. Water that is unsafe must be treated separately from this conditioner.

• This water conditioning system is to be used only for potable water.

• Inspect the water conditioning system for carrier shortage or shipping damage before beginning installation.

• Use only lead-free solder and ux, as required by

federal and state codes, when installing soldered copper plumbing.

• Use caution when installing soldered metal piping near the water conditioning system. Heat can adversely affect the plastic control valve and bypass valve.

• All plastic connections should be hand tightened. Teon

tape may be used on connections that do not use an O-ring seal. Do not use pipe dope type sealants on the valve body. Do not use pliers or pipe wrenches.

• Do not use petroleum-based lubricants such as Vaseline, oils or hydrocarbon-based lubricants. Use only 100% silicone lubricants.

• Use only the power transformer supplied with this water conditioning system.

• All electrical connections must be completed according to local codes.

• The power outlet must be grounded.

• Install an appropriate grounding strap across the inlet and

outlet piping of the water conditioning system to ensure that a proper ground is maintained.

• To disconnect power, unplug the AC adapter from its power source.

• Observe drain line requirements.

• Do not support the weight of the system on the control valve ttings, plumbing, or the bypass.

• Do not allow this water conditioning system to freeze.

Damage from freezing will void this water conditioning system’s warranty.

• Operating ambient temperature: 34° to 120°F (1° to 49°C).

• Operating water temperature: 34° to 100°F (1° to 38°C).

• Operating water pressure range : 25 to 120 psi (1.38

to 8.27 bar). In Canada the acceptable operating water pressure range is 25 to 100 psi (1.38 to 6.89 bar).

• Observe all warnings that appear in this manual.

• Keep the media tank in the upright position. Do not turn

upside down or drop. Turning the tank upside down or laying the tank on its side can cause media to enter the valve.

• Use only regenerants designed for water conditioning. Do not use ice melting salt, block salt or rock salt.

During cold weather it is recommended that the installer warm the valve to room temperature before operating.

is a trademark of E.I. duPont de Nemours.

Teon

HOW TO USE THIS MANUAL

This installation manual is designed to guide the installer through the process of installing and starting up water conditioning systems featuring the ProSense controller.

This manual is a reference and will not include every system

installation situation. The person installing this equipment

should have:

• Training on the ProSense control valve.

• Knowledge of water conditioning and how to determine

proper control settings.

• Adequate plumbing skills.

PRE-INSTALLATION CONSIDERATIONS

Water Pressure

A minimum of 25 pounds of water pressure is required for

regeneration valve to operate effectively.

Electrical Facilities

A continuous 115 volt, 60 Hertz current supply is required.

Make certain the current supply is always hot and cannot be turned off with another switch.

Existing Plumbing

Condition of existing plumbing should be free from lime and

iron buildup. Piping that is built up heavily with lime and/or iron should be replaced. If piping is clogged with iron, a separate

iron lter unit should be installed ahead of the water softener.

Location Of Softener And Drain

The softener should be located close to a drain.

Bypass Valves

Always provide for the installation of a bypass valve.

Tank and Probe Assembly

Use only 100% silicone lubricant on the probe O-rings (Figure 2). Do not allow the lubricant to come into contact with the probe pins. Install the probe assemblies into the tank and secure with the locking clasp (Figure 3).

Important: The pins on the probes will only t into the bulkhead ttings one way. The pins must go into the matching holes at the bottom of the tting. The probe with the shortest length of

wire must be on top.

NOTE: Do not attempt to tighten or loosen the Bulkhead

Figure 2

Figure 3

ttings as they are secured with a locking adhesive.

Probe Pins

Lubricate

Bulkhead Fitting

Locking Clasp

Valve to Tank Installation Instructions

WARNING:

1. Spin the valve onto the tank, ensuring the threads are not cross-threaded.

NOTE: The main control valve and tank adaptor have

right-hand threads, or clockwise, to install.

2. Rotate the valve freely without using force until it comes to a stop (this position is considered zero).

3. Rotate the valve clockwise from zero, between ¼ turn and ½ turn (Figure 4).

Figure 4

NOTE: If lubricant is required, a silicone compound is

strongly recommended. Dow Corning® Silicone Compound (available from Watts), is recommended for best possible results. Dow Corning® 7 Release Compound is used in the manufacture of this control valve. The use of other types of lubricants may attack the control’s plastic or rubber components. Petroleum-based lubricants can cause swelling in rubber parts, including O-rings and seals.

Do not exceed water pressure of 125 psi

(8.6 bar). Do not exceed 110°F (43.3°C). Do not subject unit to freezing conditions.

10. Allow the inside hot and cold faucet to remain open until all air has been purged from the plumbing system. Then close the faucet

11. Locate Manual Regeneration Options in this manual and follow the steps to initiate an Immediate Manual Regeneration. Once you have read that section place the system in backwash and unplug the system from its electrical outlet once it has cycled into the backwash position. This will stall the unit is backwash so can be purged from one of the tanks. Look on the right side of the control valve, it has indicators showing which position the control valve is in during Regeneration and which tank is In Service. Tank one has control valve and tank two has adapter.

12. Adjust the user supplied feed water valve to 1/4 open and place the bypass valve into the service position.

13. Air will come out of the drain line until the tank in backwash

is completely purged of air. Then water will ow to drain. Allow water to ow to drain for 15 minutes or until the water

to drain is clear of resin color throw.

14. Plug the system back into the electrical outlet and manually

cycle it through the remaining regeneration steps until it arrives in the service position.

15. Repeat installation steps 11, 12, 13, and 14 of the General

Installation Instructions to purge the air from the second tank.

16. Check for leaks and repair as needed.

17. Installation is now complete and the system is ready for

programming and one cycle of brine tank rell so that the correct amount of water is in the brine tank for the rst regeneration cycle. The brine tank rell must be done after

programming the system.

GENERAL INSTALLATION INSTRUCTIONS

1. Turn off water heater(s).

2. Turn off the main water supply to the home and open an inside faucet (cold and hot) to relieve any pressure within the plumbing system.

3. Place the system in the desired installation location. Make sure that the location is level and sturdy enough to support the weight of the system once it is in operation.

4. Place the bypass valve in the bypass position.

5. Connect the cold water supply to the inlet of the water softening system. While constructing the supply line, install a master supply valve (user supplied) in the supply line and close it.

6. Connect the feed water line to the home to the outlet of the system.

7. Plumb the drain line to an appropriate drain abiding buy all local, city, and state codes. Use a 3/4" drain line for

backwash ow rates that exceed 7 gpm or length that exceeds 20' (6 m).

8. Connect the brine tank to the water softener control valve

brine inlet port using the factory supplied ttings and tubing.

Add enough water to the brine tank so that water covers the top of the air check. DO NOT ADD SALT AT THIS TIME.

9. Open the user supplied feed water valve. Check for leaks and repair as needed.

ProSense Controller Operation

Power Loss Memory Retention

The ProSense controller features battery-free Time of Day and Day of Week retention during temporary loss of power. A super capacitor is designed to keep time for 8 to 24 hours depending

on the installation. If the super capacitor is exhausted the

ProSense control will display four dashes (- - : - - ) immediately upon power up. The Time of Day and Day of Week must be reset.

All other programmed parameters are stored in the static memory and are retained.

CONTROLLER FEATURES

Display Icons & Cursors

Time/Day

Regeneration Time

Salt Amount

Capacity

NOTE: In normal operation and during programming, only

a few of the icons are actually displayed.

1. This cursor is displayed when the days between regeneration are being programmed (used with .5 to 30 day regeneration programming).

2. One of these cursors is displayed to indicate which day will be programmed into the controller.

3. "PM" indicates that the time displayed is between 12:00 noon and 12:00 midnight (there is no AM indicator). PM indicator is not used if clock mode is set to 24-hour.

4. When "MIN" is displayed, the value entered is in minute increments.

5. When g/L is displayed, the value for regenerant amount entered is in grams/Liter of resin.

6. When "Kg" is displayed, the value entered is in kilograms or kilograins.

7. Four digits used to display the time or program value. Also used for error codes.

8. Colon used as part of the time display.

9. Locked/unlocked indicator. In Level I Programming this is displayed when the current parameter is locked-out. It is also used in Level II Programming to indicate if

the displayed parameter is locked (icon ashes) when

controller is in Level I.

10. When "x2" is displayed, a second regeneration has been called for.

11. The recycle sign is displayed (ashing) when a

regeneration at the next time of regeneration has

been called for. Also displayed (continuous) when in regeneration.

12. The display cursor is next to "SALT AMOUNT" when programming the amount of regenerant.

13. The display cursor is next to "REGENERATION TIME" when programming the time of regeneration and the days of regeneration.

14. The display cursor is next to "TIME/DAY" when programming the current time and day.

15. The hourglass is displayed when the motor is running. The camshaft should be turning.

Hardness

SU MO TU WE TH

SA DAYS

MIN

g/L

KGx2

x100P

Lbs/ft

16. These cursors appear next to the item that is currently displayed.

17. X100 multiplier for large values.

18. When Lbs/ft3 is displayed the value for regenerant amount entered is in pounds/cubic foot of resin.

19. Faucet is displayed when the current ow rate is displayed.

Control may show the faucet and "0", indicating no ow.

20. Maintenance interval display turns on if the months in

service exceed the value programmed in P11.

21. Displays the tank in service durning normal operating mode. Used with #22, #23 and #24 in programming mode or regeneration.

22. History Values (H). The number displayed by #23 identies which history value is currently displayed.

23. Parameter (P). Displayed only in Level II Programming.

The number displayed by #21 identies which parameter is

currently displayed.

24. Cycle (C). The number displayed by #21 is the current

cycle in the regeneration sequence.

25. Hardness setting.

26. Capacity display—shows estimated system capacity

Check Salt Light

A check salt LED light indicator is located at the bottom left of the controller keypad buttons. This light indicates, by illuminating, that the conductivity probes did not see a shift in conductivity during the last service cycle before regeneration was called for by the meter. This could be an indicator that the brine tank is out of salt. It could also indicate that the hardness of the feed water has come down and the hardness value programmed in Level 1 Programming needs to be adjusted to a more accurate value. Upon start up of a new system this light

will stay illuminated until the resin has exhausted a few times.

Then it will turn off and function normally.

CONTROLLER FEATURES continued

Keypad - Buttons

1 2 3 4

Figure 5

1. SET. Used to accept a setting that normally becomes stored in memory. Also used together with the arrow buttons.

2. DOWN arrow. Generally used to scroll down or decrement through a group of choices.

3. UP arrow. Generally used to scroll up or increment through a group of choices.

4. REGENERATE. Used to command the controller to regenerate. Also used to change the lock mode.

NOTE: If a button is not pushed for thirty seconds, the

controller returns to normal operation mode. Pushing the Regenerate button immediately returns the controller to normal operation except when the controller is in regeneration mode or Level II Programming mode.

Programming Conventions

The ProSense controller is programmed using the buttons on the keypad. The programming instructions are described two ways whenever a section has keypad input.

First a table shows simplied instructions. Second, text follows

that describes the action. In each table:

"Action" lists the event or action desired.

"Keys" are listed as:

Power-up The Controller

Plug the transformer into a non-switched outlet. The display

will show 9100. If this is the rst time the control is powered up

the display will show "_.__" if the product is for USA otherwise it will show "___". Finish programming the ProSense controller using the Level I Programming instructions.

NOTE: Err3 will be displayed when the controller

does not detect the cam at the home position and that the motor is turned on. As soon as it detects the cam at the home position, the motor will be turned off and error will disappear. The camshaft will move to service if not already in service. These cam movements may take up to 5 minutes.

Flowmeter Setting

1. Press UP key and DOWN key and hold for 3 seconds. Now the control will enter into the Level II Programming mode.

2. Use DOWN key to scroll to the parameter P16: Flowmeter parameter setting.

3. Use SET key to change the parameter value.

4. Use UP/DOWN key to set the value as per the owmeter

connected to the system.

5. Use SET key to store the modied value.

Tank In Service Parameter Setting

1. Use DOWN key to scroll to the parameter P18: Tank In Service parameter setting.

2. Use SET key to change the parameter value.

3. Use UP/DOWN key to set the value as per the tank number shown by the indicator lablel on the valve.

4. Use SET key to store the modied value and wait for 30

seconds to let the control back to service mode.

UP for up arrow

DOWN for down arrow

SET for set

REGEN for regeneration

"Duration" describes how long a button is held down:

P/R for press and release

HOLD for press and hold

X sec for a number of seconds to press the button and hold it down

"Display" calls out the display icons that are visible.

SYSTEM PROGRAMMING

After you have performed the installation steps, the conditioner will need to be programmed.

Follow these steps carefully, as they differ from previous valve instructions.

NOTE: The ProSense controller will be shipped in the

service (treated water) position. Do not rotate the camshaft before performing the following steps.

olume

Select correct resin v

olume

)

Set to time of da

Set to actual da

Set to desired time of regener

3s/f

Use to OVERRIDE calculated capacity

900

PROGRAMMING MODE

Level I Programming - ProSense

Screen Buttons to Description Range Press

SU MO TU WE TH FR SA DAYS

Time/Day

Regeneration Time

Salt Amount

Capacity

Hardness

Time/Day

Regeneration Time

Salt Amount

Capacity

Hardness

Time/Day

Regeneration Time

Salt Amount

Capacity

Hardness

Time/Day

Regeneration Time

Salt Amount

Capacity

Hardness

Time/Day

Regeneration Time

Salt Amount

Capacity

Hardness

Time/Day

Regeneration Time

Salt Amount

Capacity

Hardness

Time/Day

Regeneration Time

Salt Amount

Capacity

Hardness

Time/Day

Regeneration Time

Salt Amount

Capacity

Hardness

SU MO TU WE TH FR SA DAYS

Lbs/ft

then

press

then

press

then

press

then

press

then

press

then

press

to override

press

then

press

then

press

eet:

0.5 to 30

0.75 to

4.00

ubic

1. Resin

Note:

ote

. D

3. Day of Week

5. Da

7. Salt7. Salt

8. Capacity

8. Capacit

9. Hardness

9. Hardnes

olume

Select correct resin v

ime of DaTime of Day (12 h

y (12 hr

olume

Set to time of dayy

Setting includes PM indicator

Setting includes PM indicato

Set to actual da

ime of RegenerTime of Regeneratio

y of the w

of the

ation

Set to desired time of regener

vOv

err

ide

ea Leavv

e at 0 to disa

at 0 to disab

eek

atio

ation

et to desired da Set to desired da

regener

tionation

s bet

ys betw

een

osageDosage

Set to desired desired dosage

Set to desired desired dosa

bs per cubic

lbs per cubic f

apacity calculated by Logix Control Capacity calculated by Logix Control

t of resi

eet of resin

Use to OVERRIDE calculated capacity

Set to actual water hardness

Set to actual water hardnes

n grains per gallonin grains per gallon

Cubic f

Days: 0 (Disable)

Lbs/f

Kilograins:

ograins

to 900

rains/gal: 3Grains/gal: 3

200

ontrol programming is complet

Controller programming is complete

NOTE: If one of the following conditions occur:

Controller displays Err3 and goes to home position

Power outage discharges the supercapacitor and when power is restored and the time of day is

reset;

the regen icon will begin ashing. This indicates that a delayed regeneration will occur at the next programmed time of regeneration and the system will regenerate by water usage.

PROGRAMMING MODE continued

In Service Display

SU MO TU WE TH FR SA DAYS

Time & Day

Regen Time & Day

Salt Amount

Capacity

Hardness

SU MO TU WE TH FR SA DAYS

Time & Day

Regen Time & Day

Salt Amount

Capacity

Hardness

• Resin Volume Setting: Set to match the volume (cubic feet) of resin in the mineral tank.

• Time of Day: Includes PM indicatior. Can be set to display as a 24-hour clock. See Level II programming.

• Day of Week: Set to actual day of the week.

• Time of Regeneration: Fully adjustable. Default is 2:00 AM.

• Days Override: Range 0.5 to 30 days. Leave at 0 to disable.

• Salt Dosage: Set at pounds of salt per cubic foot of resin

in the conditioner tank.

NOTE: When the controller is set up for a twelve-hour

clock a PM indicator will illuminate when the displayed time is in the PM hours. There is no AM indicator.

Programming the Lockout Feature

All Level I parameters can be locked out when the controller is in Level II Programming. Simply press the REGEN button during Level II Programming and a lock icon will appear

indicating that the specic setting has been locked out.

When locked out, the setting cannot be adjusted in Level I Programming. To disable the Lock Out feature, press the REGEN button when in Level II. The lock icon will not be displayed.

Figure 6

The display shows the number of the tank in service (small

digit next to CPH position). The display also alternates

between Capacity Remaining and Flow Rate (faucet icon) for the tank in service.

NOTE: The Regen icon is only on when in regeneration. NOTE: The faucet icon is displayed on all the ProSense

controls when there is ow. The ProSense controller will show the faucet icon when the ow rate is displayed, even if the ow rate is zero. The faucet icon will turn off when the capacity is displayed. In service ow rate display can be replaced with a clock display using Level II Programming (Parameter P10).

Programming Overview

The ProSense controller includes multiple program levels that allow water treatment professionals to customize the system for many water conditions. Additionally, historical data can be

viewed allowing quick and easy troubleshooting. In most cases Level I Programming is all that is required to set up the water

conditioning system for proper operation. A brief description of each program level is listed below.

Level I - Used to program controller for normal applications.

Level II (P-Values) - Allows the installer to customize programming for non-standard applications.

Level III (C-Values) - Allows the installer to adjust length of select cycles for non-standard applications.

Level IV History (H-Values) - Allows access to historical information for troubleshooting the system.

NOTE: If a button is not pushed for thirty seconds, the

controller returns to normal operation mode.

Resin Volume

The amount of resin can be determined by the diameter of the tank.

Tank Diameter

(inches)

8 0.75

9 1

10 1.5

12 2

Resin Volume

Cubic Feet

Level I Programming

The ProSense controller can be quickly programmed by following the sequential procedure in the section "Placing

Water Conditioning System Into Operation". Level I Program parameters are those that can be accessed by pressing the UP or DOWN buttons. Step-by-step instructions are shown on previous page.

PROGRAMMING MODE continued

Level II Programming - P Values

Level II Programming parameters can be adjusted to ne-tune the conditioner's operation. The parameters are accessible

by pressing and holding the UP and DOWN buttons until the controller displays a "P" value.

NOTE: The controller must be in the home position to

change settings. See Table for Level II parameters. Typically the Level II parameters will not need to be adjusted as the default settings accommodate most applications. Contact your water treatment professional before attempting any programming.

Description Range

P9 Units of Measure 0-1 1 (2) 0 = US 1 = Metric

P10 Clock Mode 0-3 1 (2)

P11 Service Interval 0-99 1 0 Months

P12*

P13

P14 Rell Rate 1-700 1 (1) gpm x 100 Used with salt amount to calculate rell time.

P15 Draw Rate 1-700 1 (1) gpm x 100 Used with salt amount to calculate draw time.

P16 Flow sensor select 1-4 1 4

P17

P18 Tank in Service 1-2 1 1 Select the Tank in Service.

P19 Cleaning Cycle Interval 0-100 1 6

*The controller will automatically adjust the Hardness Setting P8 when the sensors in the resin tank detect a hardness front passing. This

automatic adjustment to the hardness setting may result in the system passing hard water near the end of the service cycle if the resin tank sensor placement setting P12 is wrong. The sensor placement setting P12 must be reduced to eliminate the problem. Reducing the Capacity Setting P7 or increasing the Hardness setting P8 will only produce a temporary solution.

NOTE: (1) Default selected with initial setting value.

Resin Tank Sensor Placement

Disable Resin Tank Sensors

K-factor or Pulse

equivalent

(2) Facotry Default is "0" for North America units and "1" for World units.

60-01 1 20 % of Capacity

0-1 1 0

0.01-99.99 0.01 0.01

Minimum

Increments

Default Units Notes

0 = 12 hour clock: ow rate displayed

1 = 24 hour clock: ow rate displayed

2 = 12 hour clock; Time of Day displayed

3 = 24 hour clock; Time of Day displayed

0 = Dissabled. Number of days per month is

xed at 30.

Expressed as a percentage of resin bed capacity

remaining after lowest set of pins.

0 = Resin Tank Sensors Enabled

1 = Resin Tank Sensors Disabled

1 = 1" Autotrol turbine

2 = 2" Autotrol turbine

3 = User dened K-factor

4 = Fleck 3/4" Paddle

5 = Fleck 3/4" Turbine

6 = Fleck 1" Paddle

7 = Fleck 1"/1-1/2" Turbine

8 = Fleck 1-1/2" Paddle

9 = Meter Factor

K-factor P16 = 3;

Pulse Equivalent P16 = 9

Number of standard regeneration cycles between cleaning regeneration cycles.

PROGRAMMING MODE continued

Level III Cycle Programming - C Values

Several Level III program parameters can be adjusted to

ne-tune valve operation for non-standard applications.

Typically these parameters will not need to be adjusted as the default settings accommodate most applications. Contact your Water Treatment Professional before attempting any programming. The parameters are accessible by pressing and holding the UP and SET buttons until the display shows a “C” value.

NOTE: The controller must be in the treated water position

to change settings.

C# Description Range

C1*

C4 Standard Fast Rinse 0-200 3 Rinses residual regenerant from tank.

C5*

C13

C14

*Cannot be changed in Level III Cycle Programming.

Brine Draw 0-200

Slow Rinse 0-200 See Notes

Standard Backwash 0-20 7

Rell 0-200 See Notes

Cleaning Backwash 0-200 14

Cleaning Fast Rinse 0-200 6

Minimum

Increments

1 Min

Default Setting Notes

See Notes

Automatically calculated from resin volume and salt dosage settings and draw rate.

Initial time automatically calculated to provide two bed volumes of rinse.

Flow rate dictated by size of drain line ow

controller.

Automatically calculated from resin volume

and salt dosage settings and rell rate.

Control uses C13 in place of C3 when the number of standard regenerations is more than

or equal to the cleaning cycle interval P19.

Control uses C14 in place of C4 when the number of standard regenerations is more than

or equal to the cleaning cycle interval P19.

+ 21 hidden pages