NZ626977B - Swimming pool operation - Google Patents
Swimming pool operationInfo
- Publication number
- NZ626977B NZ626977B NZ626977A NZ62697714A NZ626977B NZ 626977 B NZ626977 B NZ 626977B NZ 626977 A NZ626977 A NZ 626977A NZ 62697714 A NZ62697714 A NZ 62697714A NZ 626977 B NZ626977 B NZ 626977B
- Authority
- NZ
- New Zealand
- Prior art keywords
- pump
- output
- sensor
- water
- period
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 76
- 238000009434 installation Methods 0.000 claims description 5
- 230000033116 oxidation-reduction process Effects 0.000 abstract description 3
- 230000004913 activation Effects 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 10
- 241000894007 species Species 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000003068 static Effects 0.000 description 1
- 238000010407 vacuum cleaning Methods 0.000 description 1
- 230000003442 weekly Effects 0.000 description 1
Abstract
swimming pool control system has a sensor and a controller which increases pump output and/or energised electrode activation based on sensing, typically of oxidation reduction potential. This is to achieve a more effective control of oxidation reduction potential and to reduce annoyance to neighbours by having pump inactive or reduced flow overnight. urs by having pump inactive or reduced flow overnight.
Description
P1148NZAU
SWIMMING POOL OPERATION
FIELD OF THE INVENTION
The invention relates to the operation of swimming pools, and in particular to the
treatment of the swimming pool water.
“Swimming pools” as used herein is used interchangeably with “pools” to refer to
swimming pools, spas, Japanese hot tubs and like water containing structures for
bathing.
BACKGROUND TO THE INVENTION
Existing swimming pools are equipped with a pump arranged to draw water from the
swimming pool and to drive that water through a filter and in turn through an electrolytic
chlorinator before the water is returned to the pool. This arrangement of parts constitutes
a water treatment system. The filter provides mechanical filtration separating leaves and
debris from the water. The electrolytic chlorinator includes spaced electrodes between
which the water is moved. The electrodes are energised to act on the water to generate
sanitiser. The sanitiser destroys undesirable biological species.
When destroying the undesirable biological species the sanitiser is itself destroyed.
Sunlight and other factors also destroy sanitiser. Thus in the operation of a swimming
pool there is an ongoing balance between sanitiser production and the introduction of
undesirable species. The oxidation reduction potential (O RP) of the pool water provides
an indication of this balance. Generally speaking a higher ORP corresponds to more
sanitiser and less undesirable biological species.
Most existing swimming pools incorporate a single speed pump set to run a selected
number of hours per day. From time to time a pool attendant may check an ORP sensor
( a nd/or other measures of the condition of the pool water) and adjust the length of the
daily operating period as required.
P1148NZAU
The present inventor has recognised that the need for sanitiser production is highly
variable and that operating a swimming pool pump at certain times can be problematic,
for example operating a swimming pool pump late at night can upset the neighbours.
The present invention aims to provide improvements in and for the treatment of
swimming pool water, or at least to provide alternatives for those concerned with the
treatment of swimming pool water.
SUMMARY OF THE INVENTION
One aspect of the present invention provides a control system configured to
control a swimming pool pump to, at the end of a period during which the pump is
inactive, operate for a period at a treatment output to treat the swimming pool water; and
in response to a sensor output vary at least one of the treatment output and a duration
of the period during which the pump is operated at the treatment output;
wherein the sensor output is from a sensor, e.g. an ORP sensor, prior to a start of the
period during which the pump is operated at the treatment output.
The sensor output is preferably from a sensor at or before the start of the period during
which the pump is inactive. Preferably, the system is configured to in response to the
sensor output vary the treatment output.
The system may be configured to operate the pump in accordance with a repeating
schedule, in which case at least a portion of the period during which the pump is inactive
may be a lockout period defined in the repeating schedule.
Preferably the period, during which the pump is operated to deliver the treatment output,
has a fixed duration; alternatively it may end in response to the sensor.
A preferred form of the system is configured to
after the period in which the pump is operated at the treatment output
reduce the output of the pump to a reduced output having a non-zero time
averaged value, and
P1148NZAU
in response to the sensor increase the output of the pump.
Optionally the system may be configured to, after so increasing the output of the pump,
in response to the sensor reduce the output of the pump. The reduced output is
preferably substantially continuous, and is most preferably substantially constant.
The system may be configured to control an electrolytic chlorinator such that the
chlorinator’s electrodes are not energised whilst the pump is operating at its reduced
output.
Another aspect of the invention provides a control unit including
a housing containing the control system,
a power inlet for connecting the system to, to receive power from, an electrical power
supply;
a power outlet for connecting the system to, to supply power to, electrodes of an or the
electrolytic chlorinator to energise the electrodes;
a data inlet for connecting the system to, to receive an output from, the sensor; and
a data outlet for connecting the system to, to send control signals to, the pump.
Another aspect of the invention provides a swimming pool installation including
at least one of the control systems and the control unit;
a body of water in which a person may bathe,
a defined flow path along which water flows
from an inlet for receiving the water from the body of water
to an outlet for returning the water to the body of water;
the pump; and
the sensor;
wherein
P1148NZAU
the pump is arranged to drive water along the flow path;
the sensor is along the flow path to sense at least one characteristic of the water
flowing along the flow path; and
the at least one of the system and the control unit is arranged to control the pump.
Also disclosed is a swimming pool installation including
a body of water in which a person may bathe,
a defined flow path along which water flows
from an inlet for receiving the water from the body of water
to an outlet for returning the water to the body of water;
a pump arranged to drive the water along the flow path;
a sensor along the flow path to sense at least one characteristic of the water flowing
along the flow path; and
a control system configured to
operate the pump at an output having a non-zero time averaged value; and
in response to the sensor increase the output of the pump.
The installation may include an electrolytic chlorinator along the flow path to treat the
water flowing along the flow path.
Preferably the system is configured to
de-energise electrodes of the electrolytic chlorinator such that the electrodes are
not energised whilst the pump is operated at the output having a non-zero time
averaged value; and
energise the electrodes when so increasing the output of the pump in response to
the sensor.
P1148NZAU
The output having a non-zero time averaged value is preferably low enough that gases
would accumulate if the electrodes were energised whilst the pump is operated at this
output.
The installation may include
a control unit for controlling the electrolytic cell;
the control unit including
a housing containing the system,
a power inlet for connecting the system to, to receive power from, an electrical
power supply;
a power outlet for connecting the system to, to supply power to, electrodes of the
cell;
a data inlet for connecting the system to, to receive an output from, the sensor; and
a data outlet for connecting the system to, to send control signals to, the pump.
The control system is preferably configured to operate the pump for a period at a
treatment output to treat the swimming pool water then reduce the output of the pump to
so operate the pump at an output having a non-zero time averaged value.
The control system may be configured to, after so increasing the output of the pump, in
response to the sensor reduce the output of the pump.
Also disclosed is a control system configured to
control a swimming pool pump to operate the pump at an output having a non-zero time
averaged value;
de-energise electrodes of an electrolytic chlorinator though which the pumped water
flows such that the electrodes are not energised whilst the pump is operated at the
output having a non-zero time averaged value; and
in response to a sensor
P1148NZAU
increase the output of the pump, and
energise the electrodes;
wherein the output having a non-zero time averaged value is low enough that gases
would accumulate if the electrodes were energised whilst the pump is operated at this
output.
A water treatment system including the control system, the pump and the electrolytic
chorinator is also provided.
Another aspect of the invention provides a method of treating water of a swimming pool;
the swimming pool including a pump arranged to drive the water;
the method including
at the end of a period during which the pump is inactive, operating the pump for a period
at a treatment output to treat the water; and
in response to a sensor output varying at least one of the treatment output and a
duration of the period during which the pump is operated at the treatment output;
wherein the sensor output is from a sensor prior to a start of the period during which the
pump is operated at the treatment output.
Also disclosed is a method of treating water of a swimming pool;
the swimming pool including
a pump for pumping water; and
an electrolytic chlorinator through which the pumped water flows;
the method including
operating the pump at an output having a non-zero time averaged value whilst the
electrodes of the electrolytic chlorinator are not energised; and
in response to a sensor
P1148NZAU
increasing the output of the pump, and
energising the electrodes;
wherein the output having a non-zero time averaged value is low enough that gases
would accumulate if the electrodes were energised whilst the pump is operated at this
output.
The method preferably includes, after so increasing and energising, in response to the
sensor
reducing the output of the pump; and
de-energising the electrodes.
BRIEF DESCRIPTION OF THE DRAWINGS
Various exemplary features are illustrated.
Figure 1 is a schematic diagram of a pool filtration system with an electrolytic chlorinator
control system according to an embodiment of the invention;
Figure 2 is a schematic, block diagram illustrating the electrolytic chlorinator control
system used in the pool filtration system shown in Figure 1; and
Figure 3 is a front view of a user interface on the electrolytic control system shown in
Figure 2.
DESCRIPTION OF AN EMBODIMENT
The following examples are intended to illustrate the scope of the invention and to
enable reproduction and comparison. They are not intended to limit the scope of the
disclosure in any way.
Figure 1 illustrates a swimming pool filtration system 1. The system 1 includes a pump 2,
a filter 3, a heater 4, and an electrolytic cell 5. Plumbing interconnects the pump, filter,
heater, and cell and connects these elements with a swimming pool to define a fluid
circuit. The pump 2 drives water about the fluid circuit. Water is drawn from the pool via
P1148NZAU
an inlet in the form of a skimmer box 6 and then driven in series through the filter 3,
heater 4, and cell 5 before being returned to the pool via an outlet 7. An ORP sensor 8
may be mounted at any convenient location along the flow path from the inlet 6 to the
outlet 7. In this example of the system the sensor 8 is mounted between the filter 3 and
the heater 4.
The system 1 further includes a control unit 10 for controlling the pump 2 and the cell 5
in a coordinated manner. As illustrated in Figure 2, the control unit 10 includes a “control
system” or “logic arrangement” in the form of module 11 within housing 12 containing
suitable electronics (not illustrated explicitly). The control unit further includes an
incoming electrical connection (o r “power inlet”) in the form of a supply lead 14 for
drawing power from an electrical supply (n ot shown). Preferably the supply lead 14
terminates in a simple plug cooperable with a conventional socket to draw power from a
mains supply. In Australia such plugs typically include three pins (a positive, a negative
and an earth). The lead 14 is adapted to receive and provide electrical power to the logic
module 11. Alternatively, the incoming electrical connection component could be a
socket with electrical pins/prongs adapted to receive the female end of an extension
cord.
The control unit 10 further includes a second, output electrical connection (o r “power
outlet”) in the form of a socket 18 adapted to connect the electronics of the control unit
10 to the cell 5 so as to provide energising electrical power to the electrodes of the cell
. For example, a lead 16 could terminate in a plug cooperable with the socket 18 to
connect the control unit 10 and the cell 5.
The control unit 10 also includes a data outlet 22 in the form of a socket adapted to send
control signals to the pump 2. A lead 20 could terminate in a plug cooperable with the
socket 22 to connect the control unit 10 and the pump 2.
The control signal may take a variety of forms. Preferably a transformer (n ot shown) is
interposed along the lead 20 and connected to the mains supply to supply a voltage of
24 volts to the lead 20, and the electronics of the module 10 receive this voltage and
generate a signal by varying a milliamp current along the lead 20. Alternatively the
P1148NZAU
electronics of the control unit 10 may supply a voltage to the lead 20. Indeed, power
sufficient to power the pump 2 and data may be simultaneously transmitted along the
line 20 in the manner of power line communication (P LC). The use of PLC could allow a
conventional power socket to be both a power outlet and a data outlet. In a simple
implementation of the invention, the lead 20 and the socket 22 may define multiple
conduction paths corresponding to separate speed windings within the pump motor, in
which case the control signal would be the selective energisation of the conduction
paths.
In a preferred form of the invention the control unit 10 powers the pump 2 via a separate
power lead 21.
A data inlet in the form of lead 23 connects the module 11 to the sensor 8.
The control unit 10 includes logic module 11 for controlling the efficient operation of the
pump 2 and of the cell 5, which logic module 11 could be implemented via hardware,
software, or a combination of hardware and software. In the illustrated arrangement, the
logic module 11 includes a timing arrangement to operate the pump and the cell in
accordance with a timetable 11a. The control unit operates the pump and the cell in
response to the sensor 8 (i ndicative of sanitiser concentration in the pool water) and
optionally in response to other sensors such as sensor 15 located within the cell 5 (e .g.,
right by the cell’s positive and negative electrodes, as schematically illustrated) to
provide an indication of sanitiser production levels in the cell 5. Preferably the timetable
is structured for an operating period in the vicinity of four hours each morning and each
evening to treat the pool water before and after the sun is out. Sunlight tends to destroy
pool sanitiser. Treating the water outside of daylight hours is more efficient because the
sanitiser lasts longer to destroy more undesirable biological species.
The described pump 2 incorporates an infinitely variable motor and a variable frequency
drive (V FD). Optionally the VFD may be configured to deliver a plurality of discrete
selectable outputs. Control signals from the control unit 10 tell the pump 2 at which
output it should operate. The selectable outputs may include a low “detection” output
merely sufficient for maintaining the accuracy of the sensor output, one or more outputs
P1148NZAU
for effective filtration and chlorination, and one or more higher outputs for other
operations such as operating a vacuum cleaning apparatus or more rapidly filtering and
cleaning a cloudy pool.
The control unit 10 preferably includes a user interface 24, illustrated in Figure 3, for
displaying information to and receiving input from a user. The interface 24 suitably
includes:
a programming area 26 for setting the operating timetable;
a chlorine output control 28 which indicates the amount of chlorine being
produced;
a user mode area 30 for controlling the pump and chlorinator, e.g. by selecting
pre-set modes, e.g. a respective mode for pool and spa operation;
a warning display 32 for warning a user if there is no flow or if there is insufficient
salt in the pool.
Via the interface 24, a user can set the on-time for the cell 5 and the speed at which the
pump is to operate while the cell is on ( e .g. high, medium, or low) and then select the
time at which the chlorinator and pump should turn off. The described variant of the
invention allows for up to four operating periods per day to be scheduled in the
timetable. The operating periods may have different durations and pump operating
speeds. The control unit 10 is desirably mounted remotely from the pool to permit
convenient access to its user interface 24, although it is also contemplated that the logic
module might be integrated with one of the pump 2 and the cell 5.
Preferably the logic module is configured to deliver a low pump output for most of the
day and to periodically throughout the day increase the output of the pump. Operating at
a low output is energy efficient but carries the risk of voids of uncirculated, or poorly
circulated, water in the pool. Periodically operating the pump at higher output desirably
moves the water in these voids.
P1148NZAU
It is desirable that the control unit be configured to de-energise the electrodes prior, say
about five minutes prior, to deactivating the pump. This reduces the risk of sanitiser,
such as chlorine, concentrations sitting in components of the pool water treatment
system and in turn reduces the risk of accelerated corrosion of these components. In
particular, gas heaters are susceptible to corrosion caused by accumulated sanitiser.
In a preferred configuration the module 11 is pre-programmed with a schedule that
repeats on a daily basis, although it is also contemplated that the schedule might repeat
on a weekly basis to deliver differing performance on Saturday and Sunday relative to
the other days of the week. According to the preferred daily repeating schedule, there is
an overnight lock out window, e.g. from 10:00pm to 8:00am, in which the pump is turned
off so that neighbours are not annoyed by the sound of the pump during these hours. At
8:00am the pump is routinely activated at a default treatment level equivalent to about
300 litres/minute.
The output of the pump can be characterised in various possible ways. In a simple
implementation the output of the pump is determined by its rotational speed, for example
the pump may be operated at a constant rotational speed known to be equivalent to
about 300 litres/minute for a given system curve (a lthough the system curve varies
depending on the condition of the filter etc.). Alternatively, the pump may be controlled
to deliver a constant flow rate or to consume a constant power, by way of example.
Desirably this initial period of operation may have a fixed duration selected to
adequately treat the pool water on a typical day. Typically there are two key measures of
treatment:
1. a sufficient number of turns of the water to provide adequate mechanical filtration
to remove unsightly organic material; and
2. sufficient operation of the chlorinator to produce a quantity of sanitiser sufficient to
address a typical input of undesirable biological species.
By way of example an operating period of four hours (a t 300 litres/minute) may be
desirable in a 50,000 litre pool. This period of operation corresponds to about 1.5 turns.
P1148NZAU
One turn per day is considered a minimum rate for effective filtration. In contrast to
merely controlling the pump in response to an ORP sensor to achieve 2, by controlling
the pump to operate for a treatment period, the treatment period can advantageously be
set to ensure that 1 is achieved. Optionally the module 11 may be programmed, or
otherwise configured, to ensure that a predetermined volume of water is pumped during
the treatment period.
At the end of this initial treatment period the output of the pump is reduced to a much
lower level, e.g. about 50 litres/minute or less and the chlorinator deactivated. At this
flow rate the pump is operating very quietly and consuming very little power. Shaft power
consumption varies in proportion to the cube of the flow rate. This flow rate is not
considered sufficient to provide effective mechanical filtration (o r to prevent the
accumulation of gases within the chlorinator if the chlorinator was active). This is not its
purpose. Rather the continuous flow of water from the inlet 6 to the outlet 7 serves to
maintain the accuracy of the sensor 8. Without this flow the sensor would provide a false
reading, which reading would correspond to the ORP of the water within the flow path
which may materially differ from the water in the pool as the ORP of the water in the pool
drops throughout the day.
The sensing arrangement is also considered superior to simply mounting an ORP
sensor within the body of the pool. An ORP sensor within the body of the pool may well
similarly provide a false reading by being exposed to a “dead patch” of essentially static
water which may have a materially different ORP to the bulk of the water within the pool.
By operating the pump at a reduced output to move water over the ORP sensor a better
ongoing indication of the ORP of the bulk of the pool water is obtained.
Likewise, operating the pump at the treatment output for a morning treatment period
serves to better stir the pool relative to merely operating in response to an ORP sensor.
This better stirring eliminates (o r at least reduces) dead spots and stratification in the
pool water, resulting in better mechanical filtration and more homogenous pool water.
Improving the homogeneity of the pool water leads to a better indication, from the ORP
sensor, of the ORP of the bulk of the pool water.
P1148NZAU
In the described exemplary systems the reduced pump output is substantially constant
(e .g. constant RPM, flow rate or power consumption), although it is also contemplated
that the reduced output may be achieved by periodically operating the pump. For
example, the reduced output of described method could be achieved using a single
speed pump by operating that pump at a reduced duty cycle ( e .g. operating for one
minute out of every 10 minutes).
Providing a more accurate ongoing indication of ORP allows for a more timely and
appropriate reaction to changes in the ORP. By way of example if at some point during
the day a pool is occupied by a large number of urinating infants and their pets the ORP
will drop dramatically. According to existing approaches in which the pump is operated
at a fixed rate and for a fixed period each day it may take a few days for the treatment
system to restore the ORP to a satisfactory level. During this time the pool may be less
healthy than is desirable.
According to preferred implementations of the described method, the ongoing flow of
water over the ORP sensor allows for that sensor to detect such as increase in the
introduction of biological species and to activate the treatment system accordingly. The
treatment system is activated by increasing the output of the pump, e.g. to the same
output as in the morning treatment period, and by energising the electrodes of the
electrolytic chlorinator.
During the latter portions of the day after the treatment system has been so activated, it
is preferred that the treatment system be configured to be stood down, for example
returning to the same reduced output that would customarily follow the treatment period,
in response to the ORP sensor reading an ORP above a predetermined threshold set to
correspond with a satisfactory concentration of sanitiser.
Pools are often heavily used in the evening when their owners’ families return from work
and school. The additional biological loading on the pool at this time presents an
additional challenge in that despite this loading being detected and the treatment system
activated manually by a diligent pool attendant or activated in accordance with the
P1148NZAU
above method, the treatment system may not be able to adequately address this
additional biological loading by the 10:00pm lockout.
To address this challenge, preferred implementations of the described system vary the
output of the pump during the 8:00am morning treatment period in response to the
sensed ORP level at 10:00pm the night before. In a simple implementation of this
concept, if the ORP at 10:00pm is below a selected threshold that fact may be stored as
a simple one bit (“ true or false”) value, then at 8:00am the next morning the pump
operated at a higher output in response to that fact. Alternatively the value of the ORP
sensor may be stored and the increased pump output determined as a function of that
value.
Instead of or in addition to vary pump output during the morning treatment session, the
duration of the morning treatment session may be varied.
Whilst systems incorporating ORP sensors have been described, other types of sensors
are possible. By way of example sensors may be arranged to read pH and/or chlorine
levels.
It will be appreciated that various modifications to and departures from the exemplary
disclosed embodiments will occur to those having skill in the art. What is deemed to be
protected is set forth in the following claims.
P1148NZAU
Claims (25)
1. A control system configured to control a swimming pool pump to, at the end of a period during which the pump is inactive, operate for a period at a treatment output to treat the swimming pool water; and 5 in response to a sensor output vary at least one of the treatment output and a duration of the period during which the pump is operated at the treatment output; wherein the sensor output is from a sensor prior to a start of the period during which the pump is operated at the treatment output.
2. The system of claim 1 wherein the sensor output is from a sensor at or before the 10 start of the period during which the pump is inactive.
3. The system of claim 2 configured to in response to the sensor output vary the treatment output.
4. The system of claim 1, 2 or 3 being configured to operate the pump in accordance with a repeating schedule, at least a portion of the period during which the pump is 15 inactive being a lockout period defined in the repeating schedule.
5. The system of any one of claims 1, 2, 3 or 4 wherein the period, during which the pump is operated to deliver the treatment output, has a fixed duration.
6. The system of claim 1 to 5 wherein the period, during which the pump is operated to deliver the treatment output, ends in response to the sensor. 20
7. A system of any one of claims 1 to 6 being configured to after the period in which the pump is operated at the treatment output reduce the output of the pump to a reduced output having a non-zero time averaged value, and in response to the sensor increase the output of the pump. P1148NZAU
8. The system of claim 7 configured to, after so increasing the output of the pump, in response to the sensor reduce the output of the pump.
9. The system of claim 7 or 8 wherein the reduced output is substantially continuous.
10. The system of claim 7 or 8 wherein the reduced output is substantially constant. 5
11. The system of any one of claims 7 to 10 configured to control an electrolytic chlorinator such that the chlorinator’s electrodes are not energised whilst the pump is operating at its reduced output.
12. The system of any one of claims 1 to 11 wherein the sensor is an ORP sensor.
13. A control unit including 10 a housing containing the system of any one of claims 1 to 12, a power inlet for connecting the system to, to receive power from, an electrical power supply; a power outlet for connecting the system to, to supply power to, electrodes of an or the electrolytic chlorinator to energise the electrodes; 15 a data inlet for connecting the system to, to receive an output from, the sensor; and a data outlet for connecting the system to, to send control signals to, the pump.
14. A method of treating water of a swimming pool; the swimming pool including a pump arranged to drive the water; the method including 20 at the end of a period during which the pump is inactive, operating the pump for a period at a treatment output to treat the water; and in response to a sensor output varying at least one of the treatment output and a duration of the period during which the pump is operated at the treatment output; P1148NZAU wherein the sensor output is from a sensor prior to a start of the period during which the pump is operated at the treatment output.
15. The method of claim 14 wherein the sensor output is from a sensor at or before the start of the period during which the pump is inactive. 5
16. The method of claim 14 or 15 wherein the varying is varying the treatment output.
17. The method of claim 14, 15 or 16 including operating the pump in accordance with a repeating schedule, at least a portion of the period during which the pump is inactive being a lockout period defined in the repeating schedule.
18. The method of any one of claims 14 to 17 wherein the period, during which the 10 pump is operated to deliver the treatment output, has a fixed duration.
19. The method of any one of claims 14 to 17 wherein the period, during which the pump is operated to deliver the treatment output, ends in response to the sensor.
20. The method of any one of claims 14 to 19 wherein the sensor is an ORP sensor.
21. A method of any one of claims 14 to 20 including 15 after the period in which the pump is operated at the treatment output reducing the output of the pump to a reduced output having a non-zero time averaged value, and in response to the sensor increasing the output of the pump.
22. The method of claim 21 further including after so increasing the output of the 20 pump, in response to the sensor reducing the output of the pump.
23. The method of claim 21 or 22 wherein the reduced output is substantially continuous.
24. The method of claim 21 or 22 wherein the reduced output is substantially constant.
25. A swimming pool installation including 25 at least one of the system of any one of claims 1 to 12 and the control unit of claim 13; P1148NZAU a body of water in which a person may bathe, a defined flow path along which water flows from an inlet for receiving the water from the body of water to an outlet for returning the water to the body of water; 5 the pump; and the sensor; wherein the pump is arranged to drive water along the flow path; the sensor is along the flow path to sense at least one characteristic of the water 10 flowing along the flow path; and the at least one of the system and the control unit is arranged to control the pump.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ710952A NZ710952A (en) | 2013-08-30 | 2014-07-01 | Swimming pool operation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2013903312 | 2013-08-30 | ||
AU2013903312A AU2013903312A0 (en) | 2013-08-30 | Swimming pool operation |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ626977A NZ626977A (en) | 2015-09-25 |
NZ626977B true NZ626977B (en) | 2016-01-06 |
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