Water Quality - Geostar ASTON SERIES Installation Manual

General Installation Information cont.

Water Quality

In ground water situations where scaling could be heavy or where
biological growth such as iron bacteria will be present, a closed
loop system is recommended. The heat exchanger coils in ground
water systems may, over a period of time, lose heat exchange
capabilities due to a buildup of mineral deposits inside. These
can be cleaned, but only by a qualified service mechanic, as
special solutions and pumping equipment are required. Hot water
generator coils can likewise become scaled and possibly plugged.
In areas with extremely hard water, the owner should be informed
that the heat exchanger may require occasional flushing.
Material
pH Acidity/Alkalinity
Scaling
Magnesium Carbonate
Hydrogen Sulfide
Carbon Dioxide
Corrosion
Ammonia Chloride
Ammonia Nitrate
Ammonia Hydroxide
Ammonia Sulfate
Total Dissolved Solids (TDS)
Iron, FE
Bacterial Iron Potential
Iron Fouling
(Biological Growth)
Suspended Solids
Erosion
Threshold Velocity
NOTES: Grains = ppm divided by 17
mg/L is equivalent to ppm
Low Water Coil Limit
Set the freeze sensing switch SW2-1 on the Aurora Base Control
(ABC) printed circuit board for applications using a closed loop
antifreeze solution to "LOOP" (15°F). On applications using an
open loop/ground water system (or closed loop no antifreeze), set
this dip switch to "WELL" (30°F), the factory default setting. (Refer
to the DIP Switch Settings table in the Aurora Control section.)
Calcium and
less than 350 ppm
Less than 0.5 ppm (rotten egg
smell appears at 0.5 ppm)
Sulfates Less than 125 ppm
Chlorine Less than 0.5 ppm
Chlorides Less than 20 ppm
Less than 50 ppm
Ammonia
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 1000 ppm
LSI Index
2
+ (Ferrous)
Less than 1 ppm, above this level
Iron Oxide
deposition will occur
Less than 10 ppm and filtered for
max. of 600 micron size
(Fresh Water)
ASTON INDOOR SPLIT SERIES INSTALLATION MANUAL
Units with cupronickel heat exchangers are recommended for
open loop applications due to the increased resistance to build-up
and corrosion, along with reduced wear caused by acid cleaning.
Failure to adhere to the guidelines in the water quality table could
result in the loss of warranty.
Copper
7 - 9
(Total Hardness)
Less than 2 ppm
+0.5 to -0.5
< 0.2 ppm
Less than 1 ppm, above this level
deposition will occur
Less than 10 ppm and filtered for
max. of 600 micron size
< 6 ft/sec
9
90/10 Cupronickel
7 - 9
(Total Hardness)
less than 350 ppm
10 - 50 ppm
Less than 125 ppm
Less than 0.5 ppm
Less than 125 ppm
10 - 50 ppm
Less than 2 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
1000 - 1500 ppm
+0.5 to -0.5
< 0.2 ppm
Less than 1 ppm, above this level
Less than 10 ppm and filtered for
max. of 600 micron size
< 6 ft/sec
316 Stainless Steel
7 - 9
(Total Hardness)
less than 350 ppm
Less than 1 ppm
Less than 200 ppm
Less than 0.5 ppm
Less than 300 ppm
10 - 50 ppm
Less than 20 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
1000 - 1500 ppm
+0.5 to -0.5
< 0.2 ppm
deposition will occur
< 6 ft/sec
2/22/12