Chemigem DM50 How to use

POOL CONTROLS - Domestic Operating of the DM50, T60 and TL70
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CHEMIGEM
AUTOMATIC POOL CHEMISTRY
MANAGEMENT CONTROLLER
STARTING & OPERATING
DM50, T60 AND TL70
POOL CONTROLS A division of Beaumar Nominees Pty Ltd
251 Balcatta Rd, Balcatta, Western Australia, 6021
Telephone [phone] FAX [phone]

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DM50 CONTROLLER

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Key Description
1 Power on indicator light
Glows when power is being supplied to the controller.
2Switch
Switched to left shuts off Chlorine circuit.
When switched to right shuts off pH circuit.
To operate both circuits this switch must be in the centre position.
3 Chlorine Control Knob
Sets the required level of sanitisation. Normally set to the “12 o’clock“ position, with the
white indicator vertically upright.
4 Chlorine “Feed waiting light”
Glows green when Chlorine levels in the pool water are lower than that set by the control
knob. Will flash on and off when the Chlorine solenoid valve is open. (normally 6-8 seconds every 3
minutes)

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Key Description
5 Low Chlorine warning light
Glows red when Chlorine in the pool water is considerably lower than the level set by the control
knob.
6Switch
Switch to turn the warning alarm for Low Chlorine on and off.
The warning alarm sounds a continuous tone when the red Low Chlorine Light (5) above is
illuminated.
7 Excess Chlorine warning light
Glows red when Chlorine levels in the pool water are considerably higher than the levels set by the
control knob (3).
NB There is no warning alarm which sounds when Chlorine is high.
8 pH Control Knob
Sets the required level of pH. Normally set to the “12 o’clock” position, with the white indicator
line vertically upright.

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Key Description
9 Acid “Feed waiting light”
Glows green when the pH level in the pool water is higher than that set by the control knob (8).
Will flash on and off when the Acid solenoid valve is open. (Normally 5 -7 seconds every
3 minutes)
10 High pH warning light
Glows red and flashes on and off when pH in the pool water rises above pH 8.7. When this light
flashes the pH circuits are locked and Acid will not feed - See (12) Acid override button.
A warning alarm sounds an intermittent tone in step with the flashing of the red light.
11 Low pH warning light
Glows red and flashes on and off when pH in the pool water falls below pH 6.7. When this light
flashes the pH circuits are locked and again Acid will not feed.
A warning alarm sounds an intermittent tone in step with the flashing of the red light. To turn
off warning tones see section on setting Chemical Levels.

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Key Description
12 Acid override button
When pressed will disengage the pH lock-out mechanism in the case of high pH only - thus
permitting the Chemigem to feed Acid again. Overriding the lockout mechanism will only last
until the main pump for pool water circulation is turned off next.
When pressed this button also opens the Acid valve which allows the owner to manually add Acid.

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TIME CLOCK
UNDERWATER LIGHT SWITCH
Transformers available in 22V or 32V
T60 CONTROLLER TL70 CONTROLLER
Please note that the same controller used for the DM50 is used on both the TL70 and T60 - see diagram for DM50 for more
details on that face.
Introduction

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The Chemigem controller is designed to measure and automatically adjust the free Chlorine and pH
(Acid) levels in your water. These levels will be set by You using the control knob(s) on your Chemigem.
Once you have set your levels you should leave the controller to adjust them automatically.
Setting the levels
To begin with, set the control knobs with the white indicator lines in the 12 o’clock position. This will
give approximately 3.00 parts per million (ppm) Chlorine and pH 7.7.
Note a) The 12 o’clock position gives approximately 3.0 ppm Chlorine level when stabiliser is 50 ppm,
but if stabiliser is less than 30 ppm the same setting will only maintain approximately 1.0 ppm Chlorine.
Chlorine and Acid will feed for a period of 5 - 8 seconds every 3 minutes until the required levels are
reached. The first time a Chemigem operates on a pool it will take 45 - 60 minutes to fully adjust the
level of pH and Chlorine. Thereafter it will normally restore the required levels in 15 - 20 minutes, so
ensure that the pump is running for long enough to carry out these adjustments.
Calibration

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The day following the installation of your Chemigem, and after the pool pump has been running for 30
minutes, check the level of Chlorine and pH with a good quality test-kit. If either of the levels are not
exactly where you want them, alter the settings of the control knobs a little. Clockwise will direct the
Chemigem to raise the chemical levels and vice versa.
Notes : -
a) Altering the settings tells the controller what You want. The controller will only bring about
the changes as the pump circulates the pool water.
b) Chemigems are able to add chemicals quickly to adjust levels upwards, but cannot remove any
chemicals which are in excess. High levels may take several days to reduce.
c) Remember increasing the level of Acid reduces the pH values.
What the Chlorine indicator lights mean

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Note : If any red warning lights are on - test with a reliable test kit.
Green feed light “on”
This indicates that the free Chlorine level in the pool is below the level set by the control knob and
feeding will take place every 3 minutes until the required level is reached. When the green feed light is
flashing the Chlorine valve is open and Chlorine is being sucked from the drum into the line.
Red low light “on” and Chemigem alarm sounding. (Left hand light)
This indicates the free Chlorine level in the pool is considerably lower than the settings but the Chemigem
will still be able to restore the level in a short period of time. The warning tone (alarm) may be switched
off if it is annoying, but remember to switch it back on again when the levels of Chlorine have been
restored.
Low Chlorine levels could be due to the following : -
1) Initial switching on of the unit
2) Chlorine drum is empty.
3) The control knob having been turned clockwise to increase the Chlorine level.
4) The filter has been off for a long period of time on a hot day.
5) The stabiliser level is very low or non existent and causing a high rate of Chlorine loss.
NB : Stabiliser level is recommended to be 50 - 70 ppm.
6) Poor circulation.
If the symptoms persist (the low alarm continues) then the following could be the cause:-

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1) Poor suction because of :
a) Filter in need of a backwash.
b) The pump lint pot clogged.
If symptoms still persist check with the supplier.
Red excess light ‘on’ (right hand light)
The level of free Chlorine in the pool water returning to the filter is well above the level set by the dial.
Should this be due to an intentional overdose of Chlorine it may be some days before the level of Chlorine
drops and the red light goes off.
NB : Re-positioning the control knob to a higher setting will switch the excess light off but will of course
continue maintaining the pool at the higher levels of Chlorine.
An excess Chlorine light showing occasionally, may be due to :
1) The control knob being changed to a lower setting.
2) Poor circulation in the pool leading to overdosing.
3) The pH having been lowered.
4) The pouring into the pool of the last litre or two of Chlorine from a nearly empty drum
about to be replaced.
Should the excess Chlorine warning persist, the causes are possibly:

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1) pH in the pool is too low..
2) Poor circulation
What the Acid indicator lights mean (pH)

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Note : If any red warning lights are on - test with a reliable test kit.
Green light ‘on’
This indicates that the pH level in the pool is above the level set by the control knob and feeding of Acid
will take place every 3 minutes to reduce it until the required level is reached. When the green feed light
is flashing the Acid valve is open and Acid is being sucked from the drum into the line
Either of the Red lights ‘flashing’ and Chemigem alarm sounding intermittently.
This indicates that the pH is either below 6.7 (right hand light) or above 8.7 (left hand light). The pH
section differs from the Chlorine section in that it has a lock-out mechanism and the Acid will not feed if
either of the red lights are flashing. (Altering the knobs will not make any difference)
Low Acid level (left hand light)
If the left hand light is flashing the pH is above 8.7 and the pool water is low in Acid. (see Acid override
button below).
Low Acid levels could be due to the following : -
1) Initial switching on of the unit, especially in a new concrete pool.
2) Acid drum is empty.
Excess Acid level (right hand light)

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If the right hand light is flashing the pH is below 6.7 and the pool water has excess Acid. The Chemigem
will be unable to restore the levels and the lock-out mechanism will be operating.
An excess Acid light showing occasionally, may be due to :
1) Poor circulation in the pool leading to overdosing.
2) The pouring into the pool the last litre or two of Acid from a nearly empty drum about to
be replaced.
When the excess Acid light is flashing, a water test should be done immediately to check the pH - if it is
low, the appropriate amount of Soda Ash (Sodium Carbonate) or pool Buffer (Sodium Bicarbonate)
should be added straight away. (see table in the Appendix)
Acid override button
In the event of the Chemigem being locked out in a Low Acid (high pH) condition, due to the Acid drum
being empty for a few days, it may be easily restored to an active state by depressing the override button.
Overriding the lockout mechanism will only last until the main pump for pool water circulation is turned
off next.
NB : When this button is being pressed the green light flashes and the Acid valve is held open, which
allows the owner to manually add Acid.
Turning the Chemigem’s Alarms off

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Chlorine
Use the switch (6) displayed in the diagram of “DM50 Controller Face ”. (see Fig 1.)
Acid (pH)
a) Low Acid alarm - press the Acid override button momentarily.
b) Excess Acid alarm - Turn the pH completely off by moving the centre switch (see Fig 1
“DM50 Controller Face ” diagram, switch No 1) to the right.
NB - Remember, the alarms are there to warn you of significant chemical imbalances. Check the water
with a test-kit straight away and follow the fault finding programme or call your pool technician. Also, do
not forget to switch the alarm back on again when the water is back to normal.
Pool Circulation

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To enable the Chemigem controller to work at its most efficient, the mixing of the pool water has to be as
quick and complete as possible. By positioning the return nozzles (eyeballs) to the pool so that the main
pool water body rotates (swirls) is the best way to achieve this. Under no circumstances should the
eyeballs be positioned to produce opposing flow patterns.
The Multi electrode senses the Chlorine and pH levels as the water travels towards the pump, so if the
mixing of the pool water is slow the Multi electrode will not receive the signal until large amounts of
chemicals have been added to the pool. When the Multi Electrode finally receives the signal the pool will
be overdosed and the excess lights may be lit.
This problem could occur in the following situations:
1) When the pool plumbing is arranged with the skimmer box at one end of the pool and the
two inlets in the opposite end wall discharging down both sides, thereby effectively
preventing any swirling action. This can be overcome by pointing both inlet nozzles to the same
side of the pool to create the required swirl.

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2) When suction type automatic cleaners are fitted so the water is being drawn from the bottom
of the pool and inlets are pointing upwards causing a layering effect. The water returning
from the filter with the added chemicals will take a long time to mix and reach the bottom of the
pool under these conditions and again overdosing will result. The problem can be
overcome by pointing one return nozzle downwards, but taking care not to create an
opposing current to the main swirl.
To Set Time

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You need to use the large hand of the clock and move it clockwise until you get to the correct time.
Make sure you have set it to the current time as it has a 24 hour clock. To check this set the time and
make sure that the time set indicator is pointing to the correct time as well. eg - for 9.00 am the time
indicator should also point to 9.00 not 2100 as this would be 9 o’clock in the evening.
Automatic Programming (Switch must be set to Automatic)
Once you have set the correct time you are then able to set the clock to turn the pump on automatically.
This is done by pushing the yellow tags to the outside of the clock. Select the time (or times) you want
the pump to start. Push out these tags, making sure that you push enough tags out for the period of time
you want to run the pump for. Eg: If you want it to run for 2 hours from 6am all the yellow tags between
6am and 8am must be pushed to the outside of the clock. When the first tag which has been pushed out
reaches the Time Set Indicator the pump will automatically turn on. When the last tag which has been
pushed out passes the Time Set Indicator the pump will automatically turn off.
Please note that your clock has been factory set to start the pump at 8am and turn off at 10am and on again
at 6pm and off at 8pm.
NB : 1. Do not turn clock anti clockwise.
2. The minimum setting time is 15 minutes.

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