York T2GY Installer's Manual page 7

General Installation Information cont.
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
pH Acidity/Alkalinity
Scaling
Magnesium Carbonate
Hydrogen Sulfide
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
Calcium and
Less than 0.5 ppm (rotten egg
smell appears at 0.5 ppm)
Sulfates
Chlorine
Chlorides
Carbon Dioxide
Ammonia
Less than 1000 ppm
LSI Index
2
+ (Ferrous)
Less than 1 ppm, above this
Iron Oxide
level deposition will occur
Less than 10 ppm and filtered
for max. of 600 micron size
(Fresh Water)
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.
Copper
7 - 9
(Total Hardness)
less than 350 ppm
Less than 125 ppm
Less than 0.5 ppm
Less than 20 ppm
Less than 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
+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
7
T2GY INSTALLER'S GUIDE
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 deposition will occur
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
< 6 ft/sec
2/22/12