7
T2GY INSTALLER’S GUIDE
Water Quality
It is the responsibility of the system designer and installing
contractor to ensure that acceptable water quality is
present and that all applicable codes have been met in
these installations. Failure to adhere to the guidelines in
the water quality table could result in loss of warranty.
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.
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.
Water Treatment
Do not use untreated or improperly treated water. Equip-
ment damage may occur. The use of improperly treated
or untreated water in this equipment may result in scaling,
erosion, corrosion, algae or slime. Purchase of a pre-mix
Material
Copper
90/10 Cupronickel
316 Stainless Steel
pH
Acidity/Alkalinity
7 - 9
7 - 9
7 - 9
Scaling
Calcium and
Magnesium Carbonate
(Total Hardness)
less than 350 ppm
(Total Hardness)
less than 350 ppm
(Total Hardness)
less than 350 ppm
Corrosion
Hydrogen Sulfide
Less than 0.5 ppm (rotten egg
smell appears at 0.5 ppm)
10 - 50 ppm
Less than 1 ppm
Sulfates
Less than 125 ppm
Less than 125 ppm
Less than 200 ppm
Chlorine
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Chlorides
Less than 20 ppm
Less than 125 ppm
Less than 300 ppm
Carbon Dioxide
Less than 50 ppm
10 - 50 ppm
10 - 50 ppm
Ammonia
Less than 2 ppm
Less than 2 ppm
Less than 20 ppm
Ammonia Chloride
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Ammonia Nitrate
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Ammonia Hydroxide
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Ammonia Sulfate
Less than 0.5 ppm
Less than 0.5 ppm
Less than 0.5 ppm
Total Dissolved Solids (TDS)
Less than 1000 ppm
1000 - 1500 ppm
1000 - 1500 ppm
LSI Index
+0.5 to -0.5
+0.5 to -0.5
+0.5 to -0.5
Iron Fouling
(Biological Growth)
Iron, FE
2
+ (Ferrous)
Bacterial Iron Potential
< 0.2 ppm
< 0.2 ppm
< 0.2 ppm
Iron Oxide
Less than 1 ppm, above this
level deposition will occur
Less than 1 ppm, above this
level deposition will occur
Less than 1 ppm, above this
level deposition will occur
Erosion
Suspended Solids
Less than 10 ppm and filtered
for max. of 600 micron size
Less than 10 ppm and filtered
for max. of 600 micron size
Less than 10 ppm and filtered
for max. of 600 micron size
Threshold Velocity
(Fresh Water)
< 6 ft/sec
< 6 ft/sec
< 6 ft/sec
NOTES:
Grains = ppm divided by 17
mg/L is equivalent to ppm
2/22/12
antifreeze could significantly improve system reliability if
the water quality is controlled and there are additives in the
mixture to inhibit corrosion. There are many examples of
such fluids on the market today such as Environol™ 1000
(pre-mix ethanol), and others. The services of a qualified
water treatment specialist should be engaged to determine
what treatment, if any, is required. The product warranty
specifically excludes liability for corrosion, erosion or dete-
rioration of equipment.
The heat exchangers and water lines in the units are copper
or cupronickel tube. There may be other materials in the
buildings piping system that the designer may need to take
into consideration when deciding the parameters of the
water quality. If antifreeze or water treatment solution is
to be used, the designer should confirm it does not have a
detrimental effect on the materials in the system.
Contaminated Water
In applications where the water quality cannot be held to
prescribed limits, the use of a secondary or intermediate
heat exchanger is recommended to separate the unit from
the contaminated water. The table above outlines the water
quality guidelines for unit heat exchangers. If these condi-
tions are exceeded, a secondary heat exchanger is re-
quired. Failure to supply a secondary heat exchanger where
needed will result in a warranty exclusion for primary heat
exchanger corrosion or failure.
General Installation Information cont.
Summary of Contents for T2GY
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