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Water Quality
Material
pH
Scaling
Magnesium Carbonate
Corrosion
Ammonia Chloride
Ammonia Hydroxide
Total Dissolved Solids (TDS)
Iron, FE
Iron Fouling
Bacterial Iron Potential
(Biological Growth)
Suspended Solids
Erosion
Threshold Velocity
NOTES: Grains = ppm divided by 17
mg/L is equivalent to ppm
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.
Heat pumps 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.
Water Treatment
Do not use untreated or improperly treated water. Equipment
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 antifreeze could
significantly improve system reliability if the water quality is
Acidity/Alkalinity
Calcium and
Less than 0.5 ppm (rotten egg
Hydrogen Sulfide
smell appears at 0.5 ppm)
Sulfates
Chlorine
Chlorides
Carbon Dioxide
Ammonia
Ammonia Nitrate
Ammonia Sulfate
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)
DUAL COMPRESSOR PACKAGED HEAT PUMP INSTALLATION GUIDE
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
Less than 1000 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
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 deterioration 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 fro
the contaminated water. The table above outlines the water
quality guidelines for unit heat exchangers. If these conditions
are exceeded, a secondary heat exchanger is required. Failure
to supply a secondary heat exchanger where needed will
result in a warranty exclusion for primary heat exchanger
corrosion or failure.
13
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
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