WaterFurnace Series NXW - Manual (Page 13)

13
ENVISION 2 NKW 50Hz REVERSIBLE CHILLER INSTALLATION MANUAL
Envision 2 NKW Application Data cont.
1.6. Insulation
A. Heat pumps are built with factory installed insulation
on any surface that may be subject to temperatures
below the room dew point.
1.7. Brine Applications
A. Applications where the leaving fl uid temperature goes
below 4.4°C a suitable brine solution must be used.
Failure to do so can cause immediate damage to the
system. The brine must be approved for use with heat
exchangers. Automotive antifreeze solutions are not
suitable for use in brazed plate heat exchangers.
B. The freeze detection must be adjusted appropriately
for brine applications. The brine solution
concentration should be at least -9.4°C below the
lowest leaving fl uid temperature.
Water Quality Guidelines
Surface Condensation Chart
Room Ambient Condition
Surface Temperature
10°C 20°C -18°C
Normal (Max 85°F, 70% RH) 12.7mm 19.1mm 25.4mm
Mild (Max 80°F, 50% RH) 3.2mm 6.4mm 12.7mm
Severe (Max 90°F, 80% RH) 19.1mm 25.4mm 50.8mm
Material 316 Stainless Steel
pH Acidity/Alkalinity 7 - 9
Scaling
Calcium and
Magnesium Carbonate
(Total Hardness)
less than 350 ppm
Corrosion
Hydrogen Sulfide Less than 1 ppm
Sulfates Less than 200 ppm
Chlorine Less than 0.5 ppm
Chlorides Less than 300 ppm
Carbon Dioxide 10 - 50 ppm
Ammonia Less than 20 ppm
Ammonia Chloride Less than 0.5 ppm
Ammonia Nitrate Less than 0.5 ppm
Ammonia Hydroxide Less than 0.5 ppm
Ammonia Sulfate Less than 0.5 ppm
Total Dissolved Solids (TDS) 1000 - 1500 ppm
LSI Index +0.5 to -0.5
Iron Fouling
(Biological Growth)
Iron, FE 2 + (Ferrous)
Bacterial Iron Potential
< 0.2 ppm
Iron Oxide
Less than 1 ppm, above this
level deposition will occur
Erosion
Suspended Solids
Less than 10 ppm and filtered
for max. of 600 micron size
Threshold Velocity
(Fresh Water)
< 1.8 m/sec
NOTES: Grains = ppm divided by 17
mg/L is equivalent to ppm
10/07/14