SM Series Heat Pump
SM Series Heat Pump8733942411 (2017/07) Subject to change without prior notice
16 | Water Quality
Flexible hoses should be used between the unit and the
rigid system to avoid possible vibration. Ball valves
should be installed in the supply and return lines for unit
isolation and unit water flow balancing.
WATER QUALITY
NOTICE: Water side pressure rating is 450
psi for FPT fittings and 125 psi for field or
factory installed swivel fittings.
NOTICE: Do not overtighten the
connections.
Table 1: Water Quality
POTENTIAL
PROBLEM
Water Characteristic Acceptable Value
Copper Cupro-Nickel
pH (Acidity/Alkalinity) 7-9 7-9
SCALING
Hardness (CaCO3,
MgCO3)
< 350 ppm < 350 ppm
Ryznar Stability Index 6.0 - 7.5 6.0 - 7.5
Langelier Saturation Index
-0.5 - +0.5 -0.5 - +0.5
CORROSION
Hydrogen Sulfide (H2S) < 0.5 ppm * 10-50 ppm
Sulfates
< 125 ppm < 125 ppm
Chlorine
< 0.5 ppm < 0.5 ppm
Chlorides
< 20 ppm < 150 ppm
Carbon Dioxide
< 50 ppm < 50 ppm
Ammonia
< 2 ppm < 2 ppm
Ammonia Chloride
< 0.5 ppm < 0.5 ppm
Ammonia Nitrate
< 0.5 ppm < 0.5 ppm
Ammonia Hydroxide
< 0.5 ppm < 0.5 ppm
Ammonia Sulfate
< 0.5 ppm < 0.5 ppm
Dissolved Solids
< 1,000 ppm < 1,500 ppm
IRON FOULING
Iron (Fe2+ Iron Bacteria
Potential)
< 0.2 ppm < 0.2 ppm
Iron Oxide < 1 ppm < 1 ppm
EROSION
Suspended Solids < 10 ppm, < 600 μm size ** < 10 ppm, < 600 μm size **
Maximum Water Velocity
6 ft/sec 6 ft/sec
* No “rotten egg” smell present at < 0.5 ppm H2S.
** Equivalent to 30 mesh strainer
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