AAON WH Series User Manual

54
Appendix A - Heat Exchanger Corrosion Resistance
Potential
Problem
Chemical(s) or Condition
Range for Copper Heat
Exchangers
Range for Cupro-Nickel
Heat Exchangers
Scaling
Calcium & Magnesium
Carbonate
Less than 350 ppm Less than 350 ppm
Corrosion
pH Range
7-9
5-9
Total Dissolved Solids
Less than 1000 ppm
Less than 1500 ppm
Ammonia, Ammonium
Hydroxide
Less than 0.5 ppm Less than 0.5 ppm
Ammonium Chloride,
Ammonium Nitrate
Less than 0.5 ppm Less than 0.5 ppm
Calcium Chloride/ Sodium
Chloride
Less than 125 ppm
Less than 125 ppm – Note
4
Chlorine
Less than 0.5 ppm
Less than 0.5 ppm
Hydrogen Sulfide
None Allowed
None Allowed
Biological
Growth
Iron Bacteria
None Allowed
None Allowed
Iron Oxide
Less than 1 ppm
Less than 1 ppm
Erosion
Suspended Solids
Less than 10 ppm
Less than 10 ppm
Water Velocity
Less than 8ft/s
Less than 12 ft/s
Notes:
1. Harness in ppm is equivalent to harness in mg/l
2. Grains/gallon = ppm divided by 17.1
3. Copper and cupronickel heat exchangers are not recommended for pool applications for water outside the
range of the table.
4. Saltwater applications (approx. 25,000 ppm) require secondary heat exchangers due to copper piping
between the heat exchanger and the unit fittings.

AAON WH Series Specifications

General

Brand	AAON
Model	WH Series
Category	Heat Pump
Language	English