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Appendix B
Piping System Flushing
Procedure
Prior to connecting the chiller to the condenser and chilled
water loop, the piping loops shall be flushed with a detergent
and hot water (110-130°F) mixture to remove previously
accumulated dirt and other organics. In old piping systems with
heavy encrustation of inorganic materials consult a water
treatment specialist for proper passivation and/or removal of
these contaminants.
During the flushing, 30 mesh (max.) Y-strainers (or acceptable
equivalent) shall be in place in the system piping and examined
periodically as necessary to remove collected residue. The
use of on-board chiller strainers shall not be acceptable. The
flushing process shall take no less than 6 hours or until the
strainers when examined after each flushing are clean. Old
systems with heavy encrustation shall be flushed for a
minimum of 24 hours and may take as long as 48 hours before
the filters run clean. Detergent and acid concentrations shall
be used in strict accordance with the respective chemical
manufacturer's instructions. After flushing with the detergent
and/or dilute acid concentrations the system loop shall be
purged with clean water for at least one (1) hour to ensure that
all residual cleaning chemicals have been flushed out.
Prior to supplying water to the chiller the Water Treatment
Specification shall be consulted for requirements regarding the
water quality during chiller operation. The appropriate chiller
manufacturer's service literature shall be available to the
operator and/or service contractor and consulted for
guidelines concerning preventative maintenance and off-
season shutdown procedures.
CG-SVX044F-EN
Water Treatment Requirements
Supply water for both the chilled water and condenser water
circuits shall be analyzed and treated by a professional water
treatment specialist who is familiar with the operating
conditions and materials of construction specified for the
chiller's heat exchangers, headers and associated piping.
Cycles of concentration shall be controlled such that
recirculated water quality for compact chillers using 316
stainless steel brazed plate heat exchangers and carbon steel
headers is maintained within the following parameters.
Table 6.
Water property limits
Water Property
-
Alkalinity (HCO
)
3
2-
Sulfate (SO
)
4
3 -
4 2-
HCO
/ SO
Electrical Conductivity
pH
Ammonia (NH
)
3
-
Chlorides (Cl
)
Free Chlorine (Cl
)
2
Hydrogen Sulfide (H
S)
2
Free (aggressive) Carbon Dioxide
(CO
)
2
Total Hardness (°dH)
Nitrate (NO
)
3
Iron (Fe)
Aluminum (Al)
Manganese (Mn)
Concentration Limits
70-300 ppm
Less than 70 ppm
Greater than 1.0
10 - 500 μS/cm
7.5 – 9.0
Less than 2 ppm
Less than 300 ppm
Less than 1 ppm
Less than 0.05 ppm
Less than 5 ppm
4.0 - 8.5
Less than 100 ppm
Less than 0.2 ppm
Less than 0.2 ppm
Less than 0.1 ppm
55
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