Pfannenberg PWS Series - Manual (Page 12)

PWS Series Air/Water Heat Exchangers
9
The characteristics of any additives or system water ought not to deviate greatly from the hydrological
data given below.
Hydrological Data Model: Standard Device Model: VA
pH value 7 - 8.5 6 - 9
Carboxylic Acid °dH > 3 < 8 1 - 12
Free carbonic acid mg/dm3 8 - 15 1 - 100
Associated carbonic acid mg/dm3 8 - 15 not present
Corrosive carbonic acid mg/dm3 0 0 - 400
Sulphides not present not present
Oxygen mg/dm3 < 10 < 10
Chloride ions mg/dm3 < 50 < 200
Sulphate ions mg/dm3 < 250 < 500
Nitrates and nitrites mg/dm3 < 10 < 100
CSB mg/dm3 < 7 < 40
Ammonia mg/dm3 < 5 < 20
Iron mg/dm3 < 0.2 not present
Manganese mg/dm3 < 0.2 not present
Conductivity mS/cm < 2200 < 4000
Evaporation residue mg/dm3 < 500 < 2000
Potassium permanganate
consumption
mg/dm3 < 25 < 40
Suspended matter mg/dm3 < 3 > 3
< 15 split-stream cleansing
recommended > 15 constant
cleaning recommended