HTP GL-175 - Manual (Page 6)

6
LP-181 Rev. 3.25.14
the water precipitate out as the water is heated and cause accelerated lime scale accumulation on a heat transfer surface. This lime
scale build-up may result in premature failure of the storage tank. Operating temperatures above 135
o
F will further accelerate the build-
up of lime scale and may shorten the service life of the storage tank.
Water that is classified as hard and very hard must be softened to avoid storage tank failure.
CLASSIFICATION MG/L OR PPM GRAINS/GAL
Soft 0 – 17.1 0 - 1
Slightly Hard 17.1 – 60 1 – 3.5
Moderately Hard 60 – 120 3.5 – 7.0
Hard 120 – 180 7.0 – 10.5
Very Hard 180 and over 10.5 and over
If the hardness of the water exceeds the maximum level of 7 grains per gallon, water should be softened to a hardness level no lower
than 5 grains per gallon. Water softened as low as 0 to 1 grain per gallon may be under-saturated with respect to calcium carbonate,
resulting in water that is aggressive and corrosive.
pH of Water
pH is a measure of relative acidity, neutrality or alkalinity. Dissolved minerals and gases affect water pH. The pH scale ranges from 0 to
14. Water with a pH of 7 is considered neutral. Water with a pH lower than 7 is considered acidic. Water pH higher than 7 is considered
alkaline. A neutral pH (around 7) is desirable for most potable water applications. Corrosion damage and tank failures resulting
from water pH levels of lower than 6 or higher than 8 ARE NOT covered by the warranty. The ideal pH range for water used in a
storage tank or a water heater system is 7.2 to 7.8.
Total Dissolved Solids
Total Dissolved Solids (TDS) is a measurement of all minerals and solids dissolved in a water sample. The concentration of total
dissolved solids is usually expressed in parts per million (ppm).
Water with a high TDS concentration will greatly accelerate lime and scale formation in the hot water system. Most high TDS
concentrations precipitate out of the water when heated. This can generate a scale accumulation that will greatly reduce the service life
of a storage tank.
The manufacturer of the storage tank has no control over water quality, especially TDS levels in your system. Total dissolved solids in
excess of 2,000 ppm will accelerate lime and scale formation. Storage tank failure due to total dissolved solids in excess of 2,000 ppm
is a non-warrantable condition. Failure of a storage tank due to lime scale build up IS NOT covered by the warranty.
Hardness: 7 grains
Chloride levels: 100 ppm
pH levels: 6-8
TDS: 2000 ppm
Sodium: 20 mGL
PART 3 –PIPING
A. PLUMBING
It is mandatory that all plumbing be done in accordance with federal, local, and state plumbing codes and practices. Failure to properly
install the storage tank WILL VOID the warranty. It is also necessary to use both thread tape and pipe dope on all mechanical plumbing
connections.
The use of heat, such as blow torches, near the tank, may cause distortion to the high density polyethylene wrapper. Such damage is
NOT covered by warranty. Exercise caution whenever using heat sources near tank.
When filling the storage tank, open a hot water tap to release air in the tank and piping. Failure to do so could lead to improper storage
tank operation.
B. TANKLESS COIL CONNECTIONS
Refer to dimensional information chart (Figure 1) for correct tankless coil connection size. On the tank, tankless inlet is to be connected
to a bronze or stainless steel circulator with the arrow pointing away from the tank and toward the tankless coil. This pipe will also have
a tee for the cold supply to the tankless coil. (An optional check valve may be installed between the cold supply line and circulator to