JOHNSON CONTROLS
43
SECTION 4 – INSTALLATION
FORM 150.72-ICOM6
ISSUE DATE: 08/03/2022
4
Specification of Water
• Prevent particles such as silt, pipe slag, and bio-
logical matter from entering the unit to prevent
the water side channels in a BPHE from clogging.
These matters may block the channels, causing
bad performance and increased pressure drop.
Under extreme conditions, they may lead to the
BPHE freezing.
•
Properly flush the piping system to clean out the
debris and particles generated in the piping weld-
ing and process before the BPHE is connected.
• Strainers can prevent the BPHE from blocking.
If any of the media contains particles larger than
1 mm, use a strainer with a size 40 mesh at the
upstream of the BPHE.
•
Back flushing is an ideal method to clear out
the blockage. Contact a professional company
if a chemical cleaning to the BPHE is required.
Chemical cleaning is one of the high risks of
BPHE corrosion, because any chemical corrosion
will void the warranty.
• Do not allow muddy water to be used in this chill-
er.
•
Check the chemical specification of water in the
following table for chemical consideration.
TABLE 3 -
CHEMICAL SPECIFICATION OF WATER
WATER CONTENT
UNIT
CONCENTRATION
(mg/l or ppm)
TIME LIMIT
(analyze before)
Alkalinity (HCO ³-)
ppm
70–300
Within 24 hrs
Sulfate (SO42-)
ppm
< 70
No Limit
HCO3- / SO42-
—
> 1.0
No Limit
Electrical Conductivity
μS/cm
10–500
No Limit
pH
—
7.5–10
Within 24 hrs
Ammonium (NH4+)
ppm
< 2
Within 24 hrs
Chlorides (Cl-)
ppm
< 100
No Limit
Free Chlorine (Cl²)
mg/L
< 1
Within 5 hrs
Oxygen
mg/L
< 0.02
Within 5 hrs
Hydrogen Sulfide (H²S)
mg/L
< 0.05
No Limit
Free Carbon Dioxide (CO²)
mg/L
< 5
No Limit
Total Hardness (odH)
mg/L
4.0–8.5
No Limit
Nitrate (NO³-)
ppm
< 100
No Limit
Iron (Fe)
mg/L
< 0.2
No Limit
Aluminum (Al)
mg/L
< 0.2
No Limit
Manganese (Mn)
mg/L
< 0.1
No Limit