Henden HMSC20 Operating instructions

IMPORTANT
Please read carefully
Please pass these instructions on to the operator of this equipment
INSTALLATION &
OWNERS MANUAL
WARNING:
Failure to follow
these instructions
and comply with all
applicable codes
may cause serious
bodily injury and/or
property damage.
The installation of
this product should
be carried out by a
person knowledgeable
in swimming
pool plumbing
requirements following
the installation
instructions provided
in this manual.
Mineral and Salt Chlorinators
HMSC20, HMSC26

HENDEN INSTALLATION & OWNERS MANUAL |3
Contents
Henden Mineral & Salt Chlorinator
INSTALLATION
1. INSTALLATION INSTRUCTIONS 5
1.1 Installing the Power Supply 5
1.2 Connecting the In-line Electrolytic Cell to the
Power Supply 6
1.3 Connecting the Flow Switch to the Power Supply 6
1.4 Connecting the Filter Circulation Pump to the
Power Supply 6
1.5 Pre-start up procedure 7
1.6 Storage and safety 7
1.7 Mineral Salt 8
OWNERS MANUAL
2. IMPORTANT INSTRUCTIONS FOR USE 10
3. OPERATION OF YOUR HENDEN SALT WATER CHLORINATOR 11
3.1 Control panel layout 11
4. HENDEN CHLORINATOR SPECIAL FEATURES 12
4.1 System control (sanitiser output dial) 12
4.2 Polarity Indicators A & B 12
4.3 Low salinity indication 12
5. AUTOMATIC TIME CLOCK OPERATION 13
6. MAINTENANCE OF POWER SUPPLY 14
7. MAINTENANCE OF THE IN-LINE ELECTROLYTIC CELL 14
7.1 To clean the Henden In-Line Cell 14
8. DAY TO DAY OPERATION 16
8.1 Stabiliser 16
8.2 pH and total alkalinity 16
8.3 TDS levels 16
8.4 Running times 16
9. CHLORINE PRODUCTION 17
9.1 “Shock” treatment 17
9.2 Chlorine types and comparisons / max pool size 17
10. GENERAL INFORMATION 18
10.1 Pool water chemistry instructions 18
10.2 Common terms 18
11. TROUBLE SHOOTING 19
12. HENDEN™REPAIR OR REPLACEMENT GUARANTEE 19

Henden Mineral and Salt Chlorinator Installation Manual
4|HENDEN INSTALLATION & OWNERS MANUAL
INSTALLATION
Congratulations! You are now the proud owner of a new
Henden Mineral and Salt Water Chlorinator. Please read
all information in this manual carefully before installing or
operating your Salt Water Chlorinator.
In accordance with AS/NZS 60335.2.41
we are obligated to inform you that this
pump is not to be used by children or
infirm persons and must not be used as
a toy by children.
Power connections and wiring must be
carried out by an authorised electrician.
PACKING LIST
Included with your system are the following items, please
check the contents of the box carefully prior to attempting
to install the system:
• Power Supply
• In-Line Electrolytic Cell
• 2 x Barrel Unions
• Mounting Kit
• Flow Switch
• Installation & Operating Manual
• Blanking Cap Assembly (plug, o-ring and lock ring)
Note: The Chlorinator is not intended
for use by young children or infirm
persons without supervision. Please
ensure that young children are
supervised to ensure that they do not
play with the Chlorinator.

Henden Mineral and Salt Chlorinator Installation Manual
HENDEN INSTALLATION & OWNERS MANUAL |5
1. INSTALLATION INSTRUCTIONS
1.1 Installing the Power Supply
Select a convenient well-ventilated location within one
metre of filter equipment and mount the power supply
vertically onto a post or wall 1.5 metres above ground
level. Australian Standards requires that the power supply
shall not be located within 3 meters of the pool water.
Plug power supply into a suitable weatherproof outlet and
plug pump into the power outlet of the power supply unit.
The unit must be kept away from acid and other chemical
storage areas. Acid and chemical vapours will corrode the
electronics inside the unit.
It must also be kept away from heat sources. Good
ventilation is necessary for correct operation.
Two self-tapping screws and wall plugs have been provided
for fast and simple installation.
Use a 6mm masonry drill bit when fitting power supply to
a brick or concrete wall. When mounting to a post drill pilot
holes and fit screws provided. Once screws are in position
simply hang sanitiser via bracket on back of unit.
IMPORTANT This diagram is intended
to conform with SPASA for the safe
operation of salt sanitisers. Any
deviation is at the installer’s risk and
may void the manufacturer’s warranty.
NOTE The cell must be fitted to allow
for easy removal and cleaning, and
positioned after all accessories such
as heater or pool cleaner, but before
it divides if there is more than one
return to pool line.
Return to pool lineSuction Line
PUMP FILTER
ACCESSORIES
IN-LINE CELL
FLOW SWITCH
POWER SUPPLY
240V

Henden Mineral and Salt Chlorinator Installation Manual
6|HENDEN INSTALLATION & OWNERS MANUAL
1.2 Connecting the In-line Electrolytic Cell to
the Power Supply
The Henden Salt Water Chlorinator uses a reverse polarity
In-Line Electrolytic Cell for low maintenance operation.
The Henden Power Supply is fitted with a flexible lead
terminated with push on brass connectors.
These must be correctly fitted to the connections on the
cell. Fit black connectors to the outer titanium rods. Fit
the white connector to the middle titanium rod as per
illustration below.
NOTE: The Henden cell is supplied with a paddle type flow
switch, which is to be installed on the cell as shown in the
diagram on page 6.
1.3 Connecting the Flow Switch to the Power
Supply
Join the connector on the flow switch and the connector
on the cell cable together. They will clip together.
1.4 Connecting the Filter Circulation Pump to
the Power Supply
Insert the pool pump’s 3 pin plug into the 3 pin socket
located on the back of the chlorinator’s power supply plug.
See diagram on following page.
IMPORTANT The flow switch must be
mounted with the highlighted arrow
on top of the switch pointing in the
direction of flow.
IMPORTANT Always fit the cell ABOVE
the highest point in the filtration
system. This therefore needs to be
higher than the filter.
Do not use a double adaptor to
connect more than one pump – it
can cause overload to the system
and could void your warranty.
NOTE Filter circulation pump current
draw should not exceed 8 Amps.
Sanitiser’s plug
and socket
Pool pump’s
3 pin plug

Henden Mineral and Salt Chlorinator Installation Manual
HENDEN INSTALLATION & OWNERS MANUAL |7
1.5 Pre-start up procedure
Before operating your Henden Pool Sanitiser System
please ensure the following quantity of Pool Salt or
mineral salt (HMS15) and mineral activator (HMA15)
has been added to your pool.
POOL SALT
SALT LEVEL GUIDE – 20kg Bag
To raise salt
concentration by Salt Required
ppm % 25,000L
Bags / kg 30,000L Bags / kg 35,000L Bags / kg 40,000L Bags / kg 45,000L Bags / kg 50,000L Bags / kg 55,000L Bags / kg 60,000L Bags / kg 65,000L Bags / kg 70,000L Bags / kg
1000 0.1 1.3 / 26 1.5 / 30 1.8 / 36 2.0 / 40 2.3 / 46 2.5 / 50 2.8 / 56 3.0 / 60 3.3 / 66 3.5 / 70
2000 0.2 2.4 / 48 2.8 / 56 3.3 / 66 3.7 / 74 4.2 / 84 4.6 / 92 5.1 / 102 5.5 / 110 6.0 / 120 6.4 / 128
3000 0.3 3.6 / 72 4.4 / 88 5.1 / 102 5.9 / 118 6.6 / 132 7.4 / 148 8.1 / 162 8.9 / 178 9.6 / 192 10.4 / 208
4000 0.4 5.0 / 100 6.0 / 120 7.0 / 140 8.0 / 160 9.0 / 180 10.0 / 200 11.0 / 220 12.0 / 240 13.0 / 260 14.0 / 280
5000 0.5 6.3 / 126 7.5 / 150 8.8 / 176 10.0 / 200 11.3 / 226 12.5 / 250 13.8 / 276 15.0 / 300 16.3 / 326 17.5 / 350
6000 0.6 7.3 / 146 8.8 / 176 10.3 / 206 11.8 / 236 13.3 / 266 14.8 / 296 16.3 / 326 17.8 / 356 19.3 / 386 20.8 / 416
1.6 Storage and safety
1. Store in a dry, covered place away from direct
sunlight for longer bag life
2. Always use the entire bag content of salt, once
opened. Do not keep open bags of pool salt, as it is
sensitive to moisture in the air.
3. Care should be taken to avoid contact with eyes and
inhaling salt dust. Wearing eye protection and a dust
mask is good practice.
4. If eyes become affected, flush with clean tap water.
5. If skin becomes irritated, immediately wash
contaminated skin with plenty of water and then wash
with soap and water.
CHLORINE - For a new pool installation that has not been
chlorinated, add sufficient chlorine (liquid or granular) to
achieve a reading of 3 ppm (with a suitable test kit), or run
the sanitiser system continuously for at least 24 hours or
until a reading of 3 ppm is reached.
STABILISER - It is essential that pool stabiliser be added
and maintained at the rate of 30 - 50 ppm at all times. Do
not exceed 100 ppm. (FOR OUTDOOR POOLS ONLY)
(Refer Day to Day Operation page 16 for further
information).

Henden Mineral and Salt Chlorinator Installation Manual
8|HENDEN INSTALLATION & OWNERS MANUAL
1.7 Mineral Salt
For Mineral Salt applications please ensure the following
quantity of Mineral Salt (P/N: HMS15) and Mineral
Activator (P/N: HMA15) has been added to your pool.
Converting existing salt pools
Pool Size (Litres)
Henden Therapeutic
Mineral Salt
(15kg bags)
Up to 5,000 1 Bag = 15kg
Up to 10,000 2 Bags = 30kg
Up to 15,000 3 Bags = 45kg
Up to 20,000 4 Bags = 60kg
Up to 25,000 5 Bags = 75kg
Up to 30,000 6 Bags = 90kg
Up to 35,000 7 Bags = 105kg
Up to 40,000 8 Bags = 120kg
Up to 45,000 9 Bags = 135kg
Up to 50,000 10 Bags = 150kg
Up to 55,000 11 Bags = 165kg
Up to 60,000 12 Bags = 180kg
Up to 65,000 13 Bags = 195kg
Up to 70,000 14 Bags = 210kg
Up to 75,000 15 Bags = 225kg
1. Continue to operate your filter pump for a period of 24
hours following the addition of Mineral Salt to ensure
proper blending has occurred.
2. Henden Mineral Salt can be used with all Henden Salt
Water Chlorinators with recommended TDS levels of
between 4,000 and 6,000ppm.
3. When replacing normal pool salt with Henden Mineral
Salt, ensure that TDS levels do not exceed 6,000ppm
after its addition to the pool.
4. Ensure pH levels are between 7.4 & 7.6 after the addition.
To increase TDS by Approximately 1,000ppm
Pool Size (Litres)
Henden
Therapeutic
Mineral Salt
(15kg bags)
Henden Mineral
Activator
(15kg bags)
Up to 10,000 0.5 Bag 0.5 Bag
Up to 20,000 1 Bag 1 Bag
Up to 30,000 1.5 Bags 1.5 Bags
Up to 40,000 2 Bags 2 Bags
Up to 50,000 2.5 Bags 2.5 Bags
Up to 60,000 3 Bags 3 Bags
Up to 70,000 3.5 Bags 3.5 Bags
New mineral salt pools
Pool Size (Litres)
Henden
Therapeutic
Mineral Salt
(15kg bags)
Henden Mineral
Activator
(15kg bags)
Up to 5,000 1 Bag = 15kg 1 Bag = 15kg
Up to 10,000 2 Bags = 30kg 2 Bags = 30kg
Up to 15,000 3 Bags = 45kg 3 Bags = 45kg
Up to 20,000 4 Bags = 60kg 4 Bags = 60kg
Up to 25,000 5 Bags = 75kg 5 Bags = 75kg
Up to 30,000 6 Bags = 90kg 6 Bags = 90kg
Up to 35,000 7 Bags = 105kg 7 Bags = 105kg
Up to 40,000 8 Bags = 120kg 8 Bags = 120kg
Up to 45,000 9 Bags = 135kg 9 Bags = 135kg
Up to 50,000 10 Bags = 150kg 10 Bags = 150kg
Up to 55,000 11 Bags = 165kg 11 Bags = 165kg
Up to 60,000 12 Bags = 180kg 12 Bags = 180kg
Up to 65,000 13 Bags = 195kg 13 Bags = 195kg
Up to 70,000 14 Bags = 210kg 14 Bags = 210kg
Up to 75,000 15 Bags = 225kg 15 Bags = 225kg
1. With the filter pump running, pour the contents of
Henden Mineral Salt and Henden Mineral Activator into
the pool evenly around the edge.
2. Continue to operate the filter pump for a period of
24 hours following the addition to ensure proper
blending has occurred.
3. It is recommended that TDS levels be maintained
between 4,000 and 6,000ppm.
4. When using the Henden Mineral Salt and Henden
Mineral Activator, ensure that TDS levels do not exceed
6,000ppm after its addition to the pool.
5. Ensure pH levels are between 7.4 & 7.6 after the
addition.
STORAGE AND SAFETY
Store in a dry, covered place away from direct sunlight for
longer bag life
Always use the entire bag content of Mineral Salt, once
opened. Do not keep open bags of Mineral Salt as it is
sensitive to moisture in the air.
Care should be taken to avoid contact with eyes and
inhaling salt dust. Wearing eye protection and a dust mask
is good practice.
If eyes become affected, flush with clean tap water.
If skin becomes irritated, immediately wash contaminated
skin with plenty of water and then wash with soap and water.
CHLORINE - For a new pool installation that has not been
chlorinated, add sufficient Chlorine (liquid or granular) to
achieve a reading of 3 ppm (with a suitable test kit), or run
the Sanitiser system continuously for at least 24 hours or
until a reading of 3 ppm is reached.
STABILISER - It is essential that pool stabiliser be added
and maintained at the rate of 30 - 50 ppm at all times. Do
not exceed 100 ppm. (FOR OUTDOOR POOLS ONLY)
(Refer Day to Day Operation page 16 for further information).
Note: When the need arises to top up your pool with Henden Mineral
Salt or Henden Mineral Activator, due to dilution through rainfall
or backwashing. Henden recommends you use equal quantities of
Mineral Salt to Activator (ratio 1:1) and that you maintain your TDS
level between 4,000 and 6,000ppm. This will ensure your mineral pool
water stays soft, silky and crystal clear.
After adding Henden Mineral Salts to your pool the water may
temporarily have discolouration and form clusters of foam on the
surface. This is completely normal and is part of the mineralisation
stage and transformation process. This may last for 24 hours, however
after this time, your pool will return to normal and become crystal
clear and clean. It is recommended that you run your filter pump for a
minimum 24 hours after the addition of Henden Mineral Salts.

Henden Mineral and Salt Chlorinator Installation Manual
HENDEN INSTALLATION & OWNERS MANUAL |9
IMPORTANT INFORMATION
ABOUT YOUR CHLORINATOR
FACTORS THAT WILL IMPROVE THE PERFORMANCE
& LIFE OF YOUR HENDEN MINERAL & SALT CHLORINATOR
PLEASE READ THIS BEFORE OPERATING YOUR CHLORINATOR
POOL BUILDERS: Please cover this information with your customer during the
new pool “Handover Session”
Sanitisers are a valuable piece of pool sanitising equipment and must be cared for to get the best
performance and life span.
There are THREE main factors that will damage your sanitiser and reduce the life of the product.
Please monitor the following factors in accordance with your installation & operating instructions.
1. MAINTAIN RECOMMENDED TOTAL DISSOLVED SOLIDS (TDS) LEVELS
RECOMMENDED OPERATING RANGE: 4,000 - 6,000ppm
• Run sanitiser at the TDS levels stated within this document and on the product to ensure
optimum sanitiser output and cell life.
• Operating this device at low TDS levels will damage the cell and reduce its life.
• The control panel displays a red LED indicator warning when the TDS levels are low.
• If no action is taken to rectify the TDS levels, damage to the cell may result which will not be
covered under warranty.
2. MONITOR & MAINTAIN YOUR SANITISER IN-LINE CELL
Henden has a “Reverse Polarity” In-Line cell.
• To keep your Henden Salt Water Sanitiser in the best possible condition, regular monitoring
of the electrolytic cell is recommended. The ‘cell’ is the clear plastic housing containing the
plates.
• During the sanitisation process a white powdery calcium scale may naturally build up on the
titanium plates in the cell. Monitor the cell to prevent excessive scale build up. Excessive scale
build up will cause damage to your cell, and dramatically reduce its efficiency and lifespan.
• Reverse Polarity models have low maintenance cells that minimise scale build up.
• The control panel displays a red LED indicator warning when the cell requires cleaning.
• If calcium scale builds up please clean the cell, following the cleaning instructions provided on
page 14.
• NEVER: Use concentrated acid to clean your cell.
• NEVER: Leave cell in cleaning solution for extended periods of time
• NEVER: Use metal implements, scourers or brushes to clean your cell
3. BALANCED POOL WATER CHEMISTRY
Salt TDS levels MUST be maintained at 4,000 - 6,000ppm
for optimum performance and lifespan
Calcium hardness levels MUST be kept to ideal ranges of 200 - 275ppm (for concrete and tiled
pools) and 100 - 225ppm (for other surfaces) to prevent excessive scale build up and damage to
equipment
pH levels MUST be kept to ideal levels to prevent damage to equipment and pool surfaces and to
obtain optimum sanitiser effectiveness.
Total alkalinity and stabiliser levels must also be kept in an ideal range.
Note: Please refer to the POOL WATER CHEMISTRY chart on page 17 for more information.

Henden Mineral and Salt Chlorinator Owners Manual
10 |HENDEN INSTALLATION & OWNERS MANUAL
2. IMPORTANT INSTRUCTIONS FOR USE
To minimise the risk of gas build-up in the cell, you must
ensure there is sufficient water flow through the cell when
the unit is on and producing chlorine.
It is essential that your pool pump circulates sufficient
water through the cell to completely fill the cell with water
during the chlorination process.
Periodically check the paddle of the safety flow switch to
ensure it is free to move back and forth.
Diagram A
CORRECT OPERATION
WITH PUMP RUNNING
Flow switch ON.
ü
Flow switch OFF.
Diagram B
INCORRECT OPERATION
WITH PUMP RUNNING û
Flow
Flow
OWNERS MANUAL

Henden Mineral and Salt Chlorinator Owners Manual
HENDEN INSTALLATION & OWNERS MANUAL |11
68:00AM
3. OPERATION OF YOUR HENDEN SALT
WATER CHLORINATOR
Cell output is expressed as a percentage. Set the system
control to the percentage output required and the unit
will automatically adjust the cell output to the set level.
The unit is fitted with an electronic control and warning
system. This regulates the output of the unit to the
preset maximum and changes cell polarity as indicated
by POLARITY LEDs A&B. These LEDs will alternate over a
number of hours or days depending on how the unit is set
to operate. The warning system consists of one Operation
LED which will glow green to indicate normal operation or
red to indicate possible faults with the unit or damaging
operating conditions.
3.1 Control panel layout
Once the TDS level in the pool is correct the unit may be
switched on.
Note: Once the unit starts there is a short time delay until
the cell operates to ensure the filtration system is primed
with water.
At this point the Operation LED should be green; if red
refer below. Note: Polarity LED may be either A or B
whichever is on or brightest.
The red Operation LED will indicate a number of different
possible problem situations:
Possible Problem Action
TDS level below minimum Add pool salt at the required quantities specied by your
water testing agent
Cell is calcied Clean cell
Water temperature very cold Add salt to compensate for cold water
There is a problem with water ow
Check pump / pipes for blockage or damage.
Check that ow switch is connected properly and in the right
direction
SANITISER
OUTPUT DIAL
POLARITY
INDICATOR
LEDs
OPERATION
LED
FUSE HOLDER
AND FUSE
TIMER DISPLAY &
SETTINGS BUTTONS
OPERATION
SELECTOR SWITCH

Henden Mineral and Salt Chlorinator Owners Manual
12 |HENDEN INSTALLATION & OWNERS MANUAL
4. HENDEN CHLORINATOR SPECIAL
FEATURES
4.1 System control (chlorinator output dial)
The System Control varies the amount of time the cell
operates during the filtration cycle.
The System Control will not vary the electrical current
supplied to the cell.
As an example, if one filtration cycle is set at 5 hours, and
the System Control is set to 80%, then the total amount
of time the cell will operate during the 5-hour cycle will be
4 hours. If the System Control is set to 60%, the cell will
operate for 3 hours total over the 5-hour filtration cycle.
At 100% the cell will be ON for the entire 5 hour cycle.
When the System Control is set to 0, the cell will be OFF
for the duration of the filtration cycle. When the System
Control is set to 100%, the cell will be ON for the duration
of the filtration cycle. To turn the cell OFF, simply turn the
System Control to 0.
NOTE: It is recommended to turn the sanitiser output dial
to “0” when backwashing.
4.2 Polarity Indicators A & B
These LEDs are used to check that the cell current polarity
is reversing. Whichever is on (or brightest) indicates the
polarity of operation. The cell will operate in one polarity
for a number of hours so any change in these LEDs will
happen slowly and depend on how the unit is operated.
4.3 Low salinity indication
Your Henden Chlorinator is fitted with a number of
protective systems including the operation LED whose
primary function includes Low Salinity Indicator. As the
TDS level in the pool decreases, the wear on the cell
increases. Although salt and activator is not consumed
in the sanitisation process, it is lost through splashing,
backwashing and on bathers as they leave the pool. The
TDS level is also reduced by rain, which causes dilution
As the TDS level in the pool falls toward the minimum
TDS, the Operation LED will turn RED. At this point the
TDS level should be increased by adding the required
amount of salt as instructed by your pool water tester
or pool shop. The addition of salt should not affect the
Henden Chlorinator power supply as it is protected
against overloads. If no action is taken and the TDS level
continues to fall damage to the system may result.
There are other factors that can cause the unit not to
work correctly:
1. Heavy Rain – can cause very diluted pool water to pass
over the cell due to surface skimming.
2. Scaled Cell – a scaled cell will not draw as much
electrical current as a clean cell when first started.
3. Cold Water – cold pool water reduces the ability of a
cell to carry electrical current.
4. Failing Cell – as the cell ages there will come a time
when the electrical current draw will drop. This can
be compensated for with the addition of extra Salt. A
cell is considered failed when it draws less than 80%
of maximum current. Please note that the Low Salinity
Indicator is not like TDS meters, which are temperature
compensated Scientific Instruments. The accuracy will
be within 500ppm and they are water temperature
dependent, just as the cell is.

Henden Mineral and Salt Chlorinator Owners Manual
HENDEN INSTALLATION & OWNERS MANUAL |13
5. AUTOMATIC TIME CLOCK
OPERATION
Timer Setting and Functions
NOTE: When you first turn on the power to the sanitiser, it
will take approximately 1min for the LCD to appear on the
screen.
SELECTOR SWITCH
POLARITY STATUS
FUSE 3A
A B
P/N: 15777
0% 100%
1
2
3
4
5
6
7
8
Clock
Timer 1 - ON
Timer 1 - OFF
Timer 2 - ON
Timer 2 - OFF
Automatic
Manual - ON
OFF
68:00AM
Function
Description
Selector
Switch
Position
Functions and Instructions
Set Clock 1
SET THE CURRENT TIME ON THE DIGITAL CLOCK
Select the Clock position on the selector switch to enable the time of day to be input. A number ‘1’ will
appear at the left of the screen.
(a) The display will ash on and off as long as the selector switch remains at this position. Use the up
and down buttons to reach the desired times. Hold the buttons down for fast increments.
Set Timer 1 - ON 2
SET THE START TIME FOR THE FIRST RUN TIME SEQUENCE
Select the Timer 1-ON position on the selector switch. A number ‘2’ will appear at the left of the screen.
This time factory pre-set to 6am. Proceed as per (a) in the ‘Set Clock” instruction to change time.
To disable this timer, move up or down to 11:59PM. Press the UP button one more time to turn OFF.
NOTE: This step will also disable the time for ‘Set Timer 1 - OFF’.
Set Timer 1 - OFF 3
SET THE COMPLETION TIME OF THE FIRST RUN TIME SEQUENCE
Select the Timer 1- OFF position on the selector switch. A number ‘3’ will appear on the left of the
screen.
This time is factory pre-set to 8am. Proceed as per (a) in the ‘Set Clock’ instruction to change time.
Set Timer 2 - ON 4
SET THE COMPLETION TIME OF THE SECOND RUN TIME SEQUENCE
Select the Timer 2- ON position on the selector switch. A number ‘4’ will appear on the left of the screen.
This time is factory pre-set to 5pm. Proceed as per (a) in the ‘Set Clock’ instruction to change time.
To disable this timer, move up or down to 11:59PM. Press the UP button one more time to turn OFF.
NOTE: This step will also disable the time for ‘Set Timer 2 - OFF’.
Set Timer 2 - OFF 5
SET THE COMPLETION TIME OF THE SECOND RUN TIME SEQUENCE
Select the Timer 2- OFF position on the selector switch. A number ‘5’ will appear on the left of the screen.
This time is factory pre-set to 11pm. Proceed as per (a) in the ‘Set Clock’ instruction to change time.
Automatic ON 6
FILTRATION SYSTEM SWITCHES ON AND OFF AUTOMATICALLY ACCORDING TO YOUR SET
TIMES
Select the Automatic ON position on the selector switch. A number ‘6’ will appear on the left of the screen.
Manual ON 7
OVER-RIDES THE AUTOMATIC TIME CLOCK SETTINGS
& SWITCHES FILTRATION SYSTEM ON
Select the Manual ON position on the selector switch. A number ‘7’ will appear on the left of the screen.
NOTE: Sanitisation will be constant until turned OFF or back to Automatic ON. Over sanitisation may
occur if left for long durations
OFF 8
OVER-RIDES THE AUTOMATIC TIME CLOCK SETTINGS
& SWITCHES FILTRATION SYSTEM OFF
Select the OFF position on the Selector switch. A number ‘8’ will appear on the left of the screen.
NOTE: Filtration & sanitisation will cease. Not recommended for long durations.
IMPORTANT. Certain local electrical
regulations state “If the supply cord
is damaged, it must be replaced by
a special cord available from the
manufacturer or its service agent”.

Henden Mineral and Salt Chlorinator Owners Manual
14 |HENDEN INSTALLATION & OWNERS MANUAL
6. MAINTENANCE OF POWER SUPPLY
Little or no maintenance is normally required with the
exception of replacing blown fuses. These fuses can
be sourced from your local Reece Irrigation & Pools
branch. However, it is essential that the wall or post to
which the unit is installed be sprayed (not the unit itself)
periodically with a good surface type insect repellent,
since penetration by insects may cause damage, which is
not covered by your warranty.
Note: The back of the unit has been designed as a heat
sink. It is normal for this area to become very hot.
7. MAINTENANCE OF THE IN-LINE
ELECTROLYTIC CELL
The in-line cell is composed of precious materials, and
although proper maintenance can prolong its life to the
maximum, eventually the process of electrolysis will wear
away its delicate coating, at which time it gradually ceases
to produce chlorine.
Mineral salts and calcium (scale) are deposited on the
plates as electrolysis takes place. This build up will
interfere with the flow of electrical current in the cell and
thus lowers sanitiser production. It is essential to inspect
the cell regularly and clean when necessary. The rate at
which deposits will form on the plate differs with each
pool and can be influenced by the following:
• Calcium hardness of the water
• Water temperature
• pH level
• Water which has been chlorinated with calcium
hypochlorite for an extended period
• Calcium in the plaster surfaces of a concrete pool
Because these conditions vary so much, check the cell
at least weekly to begin with to see when either scale
or a blue/green soapy substance appears on the plates.
You will then be able to determine the cleaning cycle
necessary for your pool (more frequent cleaning may be
required in summer). The intervals between cleaning could
get longer to the point where cleaning is only necessary
a couple of times each year. One exception is the use of
bore water or ground water, in which case cleaning may
always need to be as frequent as once a week.
The life of the Henden electrolytic cells vary substantially
from one installation to another due to variations in
operating time, water quality and composition, system
and cell maintenance.
Please ensure that when cell replacement is necessary
you use the correct genuine Henden replacement cell to
match your system.
ALWAYS INSIST ON GENUINE Henden REPLACEMENT
PARTS.
If it is necessary to replace the in- line electrolytic cell,
beware of “look-a-likes”. Only the genuine Henden cell
is designed and warranted to operate with the Henden
power supply.
SERIOUS DAMAGE MAY RESULT TO THE
ELECTRONICS INSIDE THE UNIT IF COPY CELLS
ARE USED AND MAY VOID WARRANTY.
7.1 To clean the Henden in-line cell
Ensure that the power supply is turned off – failure to do
so may result in the pool pump turning on while the cell is
not in place. Disconnect the cell lead and flow switch from
the cell and remove the cell from the pool return line by
undoing the unions, taking care not to lose the o-rings.
Method
Assemble a blanking cap from the supplied plug, o-ring
and lock ring.
Install the blanking cap onto the end of the cell opposite
the flow switch port.
Secure the cell in a vertical position with the blanking cap
at the bottom, to catch any spills the cell should be placed
in an acid proof container.
Add 50mL of HYDROCHLORIC ACID to 500mL of WATER
in a suitable sized container, carefully pour the solution
into the open end of the cell.
NOTE In areas with hard water,
reverse polarity systems may require
occasional manual cleaning.

Henden Mineral and Salt Chlorinator Owners Manual
HENDEN INSTALLATION & OWNERS MANUAL |15
Alternatively step 4 can be carried out using an approved
commercial cell cleaning solution.
As the scale is being dissolved from the plates the solution
will foam, when this foaming action has stopped the cell
is clean and the solution can be returned to the container
for future use or discarded appropriately. NOTE: do not
leave the acid solution in the cell for more than ½hour.
Rinse the cell out with clean tap water by filling and
draining a couple of times, check that all the scale
deposits have been removed, repeat the cleaning process
if necessary.
Return the cell to its position in the pipe work and re-
connect the cell lead and flow switch.
Safety device
Hydrogen Gas is a by-product of the chlorine producing
process. A flow switch has been supplied with the unit,
which will stop sanitisation if low or no flow is detected.
Henden Chlorinator units are also fitted with a Thermal
Cut-Out to prevent overheating. If the temperature rise is
too high, power is automatically disconnected. The unit
will resume operation when it cools down.
NOTE: Always add acid to water, never
add water to acid. Always wear eye
protection and rubber gloves. Always
clean the cell in a well-ventilated area.

Henden Mineral and Salt Chlorinator Owners Manual
16 |HENDEN INSTALLATION & OWNERS MANUAL
WARNING Some people recommend
that you put salt directly in the skimmer
box. This is a very poor practice as it
allows very high concentrations of salt
to be passed through your filtration and
other pool equipment.
8. DAY TO DAY OPERATION
Four Prime rules must be observed if your unit is to give
the best possible service:
8.1 Stabiliser
The importance of pool stabiliser cannot be over –
emphasised. It is essential in helping retain chlorine
in your pool. Chlorine is rapidly dissipated by sunlight
and the use of stabiliser will reduce this dissipation
substantially. Without stabiliser, it may be necessary to
run the unit for up to three times as long!
Stabiliser should be added at the rate of 500 grams
for every 10,000 litres of water. Stabiliser should be
maintained at a level of 30 – 50 ppm. Before adding
more stabiliser, have your pool water analysed at your
pool shop to ensure that you do not add too much. (FOR
OUTDOOR POOLS ONLY, INDOOR DO NOT REQUIRE
STABILISER)
8.2 pH and total alkalinity
A correct pH level must be maintained to prevent
problems such as black spot, staining, cloudy water, etc.
An incorrect pH level can damage the pool. Correct pH
levels are as follows; fibreglass – 7.2 to 7.4 concrete & tiled
– 7.4 to 7.6 If you allow the pH level to rise to 8.0 or above,
the chlorine required could be as much as three times the
normal amount.
Total alkalinity should not be confused with pH, although
the two are closely related. Total alkalinity determines the
speed and ease of pH change. The ideal range is 80 – 150
ppm, or refer to your pool professional.
You should use a test kit which includes a test for total
alkalinity. Low total alkalinity can cause unstable
pH levels – i.e. An inability to keep the pH constant may
cause staining, etching and corrosion of metals. High total
alkalinity will cause constantly high pH levels.
8.3 TDS levels
Salt is the essential element by which your unit operates.
Insufficient salt will damage your cell.
RECOMMENDED TDS LEVEL RANGE: 4,000 -
6,000ppm
Salt is NOT used up in the sanitisation process or by
evaporation. It is only lost through backwashing, splash-
out, overflow or by leakage from the pool or plumbing.
Heavy rain can dilute the TDS levels in your pool;
therefore TDS levels should be checked during these
events.
Low TDS levels will destroy the coating on the anode
plates and will void all warranty.
The Henden Chlorinator has a built in warning indicator to
minimise damage resulting from insufficient TDS levels,
however, the ultimate responsibility is on the owner to
ensure adequate TDS levels are maintained all year round.
8.4 Running times
These instructions cover Henden Chlorinator for
residential use only.
If you run your sanitiser for 24 hours a day, or for
long periods, the cell life will be greatly reduced. It is
important that the correct model Henden Chlorinator has
been installed on your pool. Many models are available
from Henden to cope with small courtyard pools up
to commercial applications. (Consult your local Reece
Irrigation & Pools branch for more information).
Note: The Henden guarantee does not apply to
commercial or semi-commercial installations,
i.e. where the system runs more than an average
of 8 hours per day over the year. Guarantee on
commercial and semi-commercial installations is
12 months only on both power supply and cells.
WARNING Do not add Hydrogen
Peroxide to pool water or through
swimming pool hydraulic or sanitiser
system. Use of Hydrogen Peroxide will
void warranty on Henden products.

Henden Mineral and Salt Chlorinator Owners Manual
HENDEN INSTALLATION & OWNERS MANUAL |17
9. CHLORINE PRODUCTION
The Henden Chlorinator must be run daily to generate
sufficient chlorine to sanitise the pool. During Summer
this is approximately eight hours per day, preferably in
two periods - between 6.00 and 8.00am and between
5.00 and 11.00pm. Night time is preferable because
chlorine dissipates rapidly in direct sunlight. If these
running times are observed, and the cell is functioning
correctly, your pool will have sufficient chlorine when
tested in the morning.
If the level is too low either longer running times are
required or the Sanitiser Output Control needs to be
adjusted to maximum. Harsh local conditions such as
traffic pollution or wind borne dust require different
running times, in which case, seek advice from your
pool shop. During winter approximately 4 to 6 hours a
day should provide enough chlorine. Without sufficient
filtration/sanitisation, your pool will never function
correctly. ALWAYS RUN THE PUMP WHEN SWIMMING
IN THE POOL. In extremely hot weather or during periods
of heavy bathing loads, the running time may need to be
extended to 10 – 14 hours per day.
In some cases you may find your chlorine level to be
too high. To determine if this is the case, run your filter/
sanitiser for the suggested times/chlorine production level
and test your pool water on the morning after operation.
If your chlorine test shows a high level of chlorine, either
the running times can be reduced slightly, or the Sanitiser
Output Control can be turned anti-clockwise. Test your
chlorine level again the following morning at around the
same time. If your chlorine level is still high, repeat the
above process until the correct level is attained.
9.1 “Shock” treatment
Periodically, especially during extremely hot conditions, it
may be necessary to boost the amount of chlorine in your
pool in order to maintain absolute sanitation of the water.
This can be achieved by adding either liquid or granulated
chlorine. If granulated chlorine is added, the cell must be
checked regularly, since the additives from this product
will clog the electrodes. Alternatively, extend the running
time of your Henden Chlorinator.
9.2 Chlorine types and comparisons / max pool
size
Many sanitiser manufacturers calibrate their units
to compare with 65% granulated chlorine, making it
necessary to adjust their readings to a lower level in
order to determine true chlorine production. Below is a
comparison table of the available types of chlorine used to
sanitise pools.
Henden
Model
Production
Maximum
(g/hr 100%)
Production
(g/hr 65%
equivalent)
Chlorine
produced
over
8 hours
(grams 100%)
Maximum Pool Size (Litres)
Cool
Climates
<25ºC
Temperate
Climates
25ºC to 30ºC
Hot & Tropical
Climates
>30ºC
HMSC20 20 31 160 100,000 62,000 44,000
HMSC26 26 40 208 130,000 81,000 57,000
NOTE The appropriate sanitiser size
for your pool is dependent on the local
climate and the bather load of the
pool. Please note that sanitiser cell life
can be increased with shorter running
times during winter and lower output
settings. Henden recommends that a
sanitiser is run for between 6 - 8 hours
a day during summer, and 4 hours
during winter.

Henden Mineral and Salt Chlorinator Owners Manual
18 |HENDEN INSTALLATION & OWNERS MANUAL
10. GENERAL INFORMATION
10.1 Pool water chemistry instructions
POOL WATER
BALANCE
Free Chlorine
(ppm) pH
Total
alkalinity TA
(ppm)
Calcium
hardness
(ppm)
Stabiliser -
Cyanuric Acid
(ppm)
Recommended
TDS levels
(ppm)
Ideal reading/
range 1.5 - 3
Concrete &
tiled pools
7.4-7.6
Other surfaces
7.2-7.4
80 - 150
Concrete &
tiled pools
200-275
Other surfaces
100-225
30 - 50 4,000 - 6,000
To increase
Increase
output of
sanitiser.
Add chlorine.
Increase
ltration time.
Add Soda
Ash (Sodium
Carbonate)
Add Buffer
(Sodium
Bicarbonate)
Add Calcium
Chloride
Add Cyanuric
Acid
Add equal
quantities of
Henden Salt
and Activator
(1:1)
To decrease
Decrease
output of
sanitiser.
Decrease
ltration time.
Add
Hydrochloric
Acid
Add
Hydrochloric
Acid or Dry
Acid
Partially drain
& rell pool
with lower
hardness
water to dilute
Partially drain
& rell pool
to dilute
Partially drain
& rell pool
to dilute
Frequency
of testing Weekly Weekly Weekly Weekly Regularly Regularly
10.2 Common terms
Algae Microscopic forms of plant life which enter the pool by rain, wind and dust. There are
numerous varieties – some are free floating whilst others grow on walls and in cracks and
come in different colours. Some are more resistant to chemical treatment than others.
Bacteria The germs that contaminate your pool. Introduced by swimmers, dust, rain storms and other
elements.
Balanced Water The correct ratio of mineral content and pH level that prevents pool water from being
corrosive or scale forming.
Chloramines Compounds formed when chlorine combines with nitrogen from urine, perspiration, etc.
Chloramines cause eye and skin irritation, as well as unpleasant odours.
Chlorine Demand The chlorine required to destroy germs, algae and other contaminants in the pool.
Chlorine Residual The amount of chlorine remaining after chlorine demand has been satisfied.
This is the reading obtained with your test kit.
Cyanuric Acid Also known as stabiliser or conditioner. It reduces dissipation of chlorine by direct sunlight.
Liquid Acid Chemical used to reduce the pH and total alkalinity in the pool water, and for cleaning
sanitiser cell.
ppm An abbreviation for Parts Per Million the accepted measurement of chemical concentration in
swimming pool water. I ppm- l mg/L.

Henden Mineral and Salt Chlorinator Owners Manual
HENDEN INSTALLATION & OWNERS MANUAL |19
12. HENDEN™REPAIR OR
REPLACEMENT GUARANTEE
Our goods come with guarantees that cannot be
excluded under the Australian Consumer Law. You are
entitled to a replacement or refund for a major failure
and compensation for any other reasonably foreseeable
loss or damage. You are also entitled to have the goods
repaired or replaced if the goods fail to be of acceptable
quality and the failure does not amount to a major failure.
Should you experience any difficulties with your Henden
product, we suggest in the first instance that you contact
the installer of the product or your local Reece Irrigation
& Pools branch.
Alternatively you can phone Henden. On receipt of your
claim, Henden will seek to resolve your difficulties, if the
product is faulty or defective, advise you on how to have
your Henden product repaired, obtain a replacement or
a refund.
Henden does not cover normal wear or tear, or damage
resulting from misuse or negligent handling, improper
use for which the product was not designed or advertised,
failure to properly follow the provided installation and
operating instructions, failure to carry out maintenance,
corrosive or abrasive water or other liquid, lightning or
high voltage spikes, or unauthorized persons attempting
repairs. Where applicable, your Henden product must
only be connected to the voltage shown on the nameplate.
Henden does not cover freight or any other costs incurred
in making a claim. Please retain your receipt as proof
of purchase; you MUST provide evidence of the date of
original purchase when making a claim.
Henden shall not be liable for any loss of profits or any
consequential, indirect or special loss, damage or injury
of any kind whatsoever arising directly or indirectly from
Henden products.
Should your Henden product require repair or service after
the guarantee period; contact your nearest Reece Irrigation
and Pools branch or phone the number below.
For a complete list of Reece Irrigation & Pools branches
visit our website reece.com.au/storefinder or contact:
TECHNICAL AND AFTER SALES SUPPORT:
1300 HENDEN (1300 436 336)
MAILING/MANUFACTURER ADDRESS:
Davey Water Products
6 Lakeview Drive, Scoresby,
Victoria, 3179
11. TROUBLE SHOOTING
No Chlorine Production - Check for:
1. Main power outlet switched off
2. Sanitiser not plugged into main outlet
3. Pump not plugged into sanitiser
4. Time Clock set to Off position/Power switch turned Off
5. Sanitiser Output Control turned to “0” setting
6. Sanitiser fuse blown
7. Dirty Cell
8. Filter needs back washing
9. Flow switch not connected
10.Insufficient water flow through cell
11. Running times incorrect
12. Main house fuse blown
13. Pump motor faulty
Low Chlorine Production - Check for:
1. Dirty cell - clean if required
2. Filter needs back washing
3. Cell failing
4. Pool stabiliser too low
5. pH too high
6. TDS level too low
7. Running time inadequate
8. Sanitiser output control set too low.
Henden Guarantee Period
Power Supply - Four Years
Electrolytic In Line Cell - Three Years

P/N 403203-2