Watermaid WM40 Owner's Handbook Manual - page 6
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2. INSTALLATION
The WATERMAID® chlorinator may be installed by the pool owner (Australian and European models
only). However, these instructions should be fully understood to ensure correct installation and safe
operation. Incorrect installation may pose a danger and/or may damage the unit thus voiding warranty.
If there is any doubt, then an experienced pool technician or plumber should carry out the installation.
US and Canadian models will require a qualified electrician to hard wire the chlorinator to run
inconjunction with the pump.
(i) MEASURE THE POOL
The QT300, XT300 and EZ300 Cells are designed to operate with a salt level of 6000ppm.
If there is NO salt in the pool, the amount of salt required is worked out by the following calculation:
SALT REQUIRED (Kg) = POOL VOLUME (L) x 0.006 or
SALT REQUIRED (lb) = POOL VOLUME (gal) x 0.006 x 8.3453
The QT400 and XT400 Cells are designed to operate with a salt level of 4000ppm.
If there is NO salt in the pool, the amount of salt required is worked out by the following calculation:
SALT REQUIRED (Kg) = POOL VOLUME (L) x 0.004 or
SALT REQUIRED (lb) = POOL VOLUME (gal) x 0.004 x 8.3453
For a pool that already has salt in it, calculate:
SALT REQUIRED = (DESIRED SALT LEVEL - SALT LEVEL ALREADY IN POOL) x POOL VOLUME (L)
where ppm is "parts per million". Eg: 6,000ppm = 6,000 / 1,000,000 = 0.006
(ii) ADDING SALT
Empty the contents of the required salt bags into the shallow end. Run the filter and pump
simultaneously to circulate the water and dissolve the salt. If the WATERMAID® chlorinator has already
been installed, the switch underneath the should be turned OFF while salt is dissolving.
Quality pool salt (with low levels of iron and other impurities) should be used. Finer grades dissolve
faster. Salt may take 24 - 48 hours to dissolve in summer and longer in winter. Alternatively,
sea water may be used. The salt bag should NOT be thrown into the pool as chemicals and inks can
interfere with the water balance.
If the pool has no main drain, place a vacuum hose head in the deep end, and sweep the salt toward
the vacuum head. The other end of the vacuum hose should be placed in the skimmer box. Run the
filter and pump with the Cell "On/Off" switch OFF to circulate the undissolved salt in the water.
WARNING: Never add chemicals directly to the skimmer basket as this may damage the Cell.
The size of a pool determines the amount of salt
to add. If the pool shape is rectangular, then the
length, breadth and average depth are
multiplied. If the pool has an irregular shape,
then the average of the measurements can be
taken.
Pools that have used liquid chlorine for many
years prior to having a WATERMAID®
chlorinator may already have a significant salt
level in the water. It is advisable to check the
salt level before adding salt. This can be done by
either using a WATERMAID® hydrometer or
taking a sample of water to a pool shop.
Average
Depth = 1.5M
Breadth = 4.5M
Length = 9M
One bag of salt usually
contains 25 Kg or 40 lb.
Average Pool
10 x 4 x 1.5 m
=60,000 litres or 60 m³
or
30 x 15 x 4 feet x 6.25
=12,000 gallons
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4. Floc the pool with a clarifier. After a few hours, a blanket of debris will settle on the pool floor
and can then be vacuumed directly to waste (i.e. NOT through the filter). The switch underneath the
WATERMAID® Power Supply should be turned OFF while vacuuming to waste. Following this,
the pool should gradually attain a clean, clear condition after constant filtration and chlorination.
5. Finally, the use of lanthanum carbonate (or "Starver") is recommended to reduce the
phosphorous content to less than 1 part per billion. This starves algae of an essential element for
growth.
As a guide, the WATERMAID® chlorinator may need to be run non-stop for several days to overcome
the addition of an algaecide. Otherwise, a sufficient chlorine reading may be impossible to obtain for up
to four (4) weeks.
For spas, it is often best to drain, clean and refill. Follow the manufacturer’s recommended procedure.
12. ELECTRICITY COSTS
When an Australian 240VAC model WATERMAID® chlorinator is running at full capacity, it is using 300
watts of power.
{POWER (watts) = VOLTS X AMPS}
Therefore the cost to run a WATERMAID® chlorinator at full capacity is worked out using the following
formula:
COST = No. of x Hours x Cost Per
TO
Watts Run kWh
RUN
1000
For example, to run a WATERMAID® WM40 chlorinator for 10 hours per day during off peak hours,
where the off peak rate of electricity is 8.8 cents/kWh, the electricity cost will be:
= 300 (Watts) ÷ 1000 x 10 (Hours) x 8.8 (kWh)
= 26.4 c / day
Off Peak Hours = 10pm - 7am, 7 days
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