Pentair STA-RITE SC-75 - Cell Cleaning and Inspection

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English
SC-75™ Salt Chlorinator Usage Hours Meter
The SC-75 provides a built-in cell “usage hours” meter that reports how many hours SC-75 has been operang.
To access the system status mode:
1. Press and hold the MORE buon for three (3) seconds unl the lights scroll across the unit.
2. One (1) of the three (3) Sanizer Output LED indicators (Low, Med, High) will be lit, indicang the hours of usage. The
Output LEDs are as follows:
• 2000 hours (Low LED on)
• 4000 hours (Med LED on
• 6000 hours (High LED on)
Cleaning the SC-75 Cell Blades
Note: Before acid washing, remove the calcium buildup in cell: Use a garden hose on the jet seng and spray directly into
both ends of the cell. Most of this calcium buildup has a slushy consistency and will be blown out of the cell. Once the
majority of the calcium has been removed, connue with acid washing which will now be more eecve since most of the
calcium has been removed.
1. Automac Cleaning: The SC-75 has an automac cell blade cleaning feature (cell reversing) that helps remove scale
deposits from the SC-75 blades. Note: Automac cleaning does not interrupt chlorine producon. “Scale” is a white crusty
deposit that forms in excessively hard water or from pool water that is out of balance and in a scaling condion. If the SC-75
blades show excessive scaling, you need to perform an acid wash cleaning. Proceed to “Acid Wash Cleaning” Step 2.
2. Acid Wash Cleaning: If the SC-75 blades show a tendency to scale, it is recommended that every two (2) months the
SC-75 be removed and inspected for scale formaon and/or debris on the SC-75 blades. High hardness areas may require
more frequent cleaning. Some lters allow debris to pass through to the SC-75, possibly lodging between the blades in the
SC-75. A small amount of scale formaon is normal. If by looking through the SC-75, it is observed that there is excessive
scale formaon between the blades, or debris is present, the SC-75 must be cleaned as follows:
Use a high-pressure jet of water from a garden hose. If the blades cannot be reasonably cleaned in this manner,
acid cleaning is necessary.
TO ACID CLEAN THE SC-75™ BLADES:
1. Disconnect the AC power from the Power Center. Disconnect the SC-75 Salt Chlorinator cell communicaon cable from
the Power Center.
2. Mix one (1) part acid with one (1) part tap water in a plasc bucket.
3. Submerge the blades in this soluon without allowing the control panel or cables to be exposed to the soluon
4. Allow the acid soluon to bubble, and to clean the blades.
The acid should only be contained inside the SC-75 covering the blades. Try not to spill the acid on the outside of the SC-75.
If acid does spill on the outside of the SC-75, wash it o with water. A foaming acon will begin, which is caused by scale
(calcium carbonate) being dissolved from the blades. If rigorous foaming acon does not begin, the blades do not need to
be cleaned (STOP THE CLEANING PROCESS - go on to the next step). Otherwise, allow the blades to remain immersed in the
soluon unl the foaming has stopped. However, do not leave acid in the SC-75 for more than thirty (30) minutes. Excessive
acid washing will damage the blades.
5. Remove the SC-75 from the bucket and place in an empty 20 liter bucket. Rinse the inside and outside of the SC-75
thoroughly with clean tap water and inspect. If deposits are sll visible, repeat the acid cleaning process.
6. Rinse the SC-75 again with clean tap water and inspect. Once clean, replace the SC-75 and resume normal operaon.
7. If the acid wash procedure is necessary, it is recommended that a sample of pool water be analyzed by a pool professional
for excessive calcium hardness (i.e. ideal range is 200 to 400 ppm) and/or improper water balance.
8. Inspect the inside of the SC-75 every two (2) months (or more frequent in hard water areas). If no scale or debris deposits
are observed inside the SC-75 aer four (4) months, it is not necessary to connue inspecons every two (2) months. However,
due to possible changes in pool water chemistry and ltering eecveness, it is recommended that the cell be removed for
inspecon at least twice a year.
9. Reconnect the SC-75 communicaon cable plug in the Power Center, then reconnect AC power to the Power Center.
Winterizing
Very lile chlorine producon is needed in cold water so long as free chlorine levels are maintained at 2.0 - 4.0 ppm. The
SC-75 Salt Chlorinator will not produce chlorine below 12° C. This low-temperature cuto extends the life of the cell. If
preventave measures are not taken, freezing water may cause severe damage to the cell. Prevent freeze damage to the cell
by running the pool pump connuously or winterize the pool by draining water from pump, lter and all intake and return
lines. Remove the cell, clean and store it.