Carrier Aquasnap 30RAP010, Product Data

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might be installed with the hydronic package of the 30RAP
unit is shown on pages 41-43.
It is recommended that isolation (shutoff) valves be placed
exterior to the unit to allow removal and service of the
entire pump assembly, if necessary. Also, if the unit is iso-
lated with valves, a properly sized pressure relief valve
should be installed in the piping between the unit and the
valves, following all applicable state and local codes.
Water system cleaning
Proper water system cleaning is of vital importance. Exces-
sive particulates in the water system can cause excessive
pump seal wear, reduce or stop flow, and cause damage of
other components. Water quality should be maintained
within the limits indicated in the Water Quality Characteris-
tics and Limitations table.
1. Install a temporary bypass around the chiller to avoid
circulating dirty water and particulates into the pump
package and chiller during the flush. Use a temporary
circulating pump during the cleaning process. Also,
be sure that there is capability to fully drain the sys-
tem after cleaning.
2. Be sure to use a cleaning agent that is compatible
with all system materials. Be especially careful if the
system contains any galvanized or aluminum compo-
nents. Both detergent-dispersant and alkaline-disper-
sant cleaning agents are available.
3. It is a good idea to fill the system through a water
meter. This provides a reference point for the future
for loop volume readings, but it also establishes the
correct quantity of cleaner needed in order to get the
required concentration.
4. Use a feeder/transfer pump to mix the solution and
fill the system. Circulate the cleaning system for the
length of time recommended by the cleaning agent
manufacturer.
a. After cleaning, drain the cleaning fluid and flush
the system with fresh water.
b. A slight amount of cleaning residue in the system
can help keep the desired, slightly alkaline, water
pH of 8 to 9. Avoid a pH greater than 10, since
this will adversely affect pump seal components.
c. A side stream filter is recommended during the
cleaning process. Filter side flow rate should be
enough to filter the entire water volume every 3 to
4 hours. Change filters as often as necessary dur-
ing the cleaning process.
d. Remove temporary bypass when cleaning is
complete.
A strainer with a blow-down valve is standard on all
30RAP units, both with and without hydronic packages.
The blow-down valve allows removal of particulates caught
in the strainer without complete removal of the screen. A
female NPT connection is provided on the valve, allowing
hose connection for drainage outside the unit.
The
Comfort Link™ controls provided have a built-in fea-
ture to remind building owners or operators to clean the
strainer by discharging the blow-down valve at a pre-set
time interval. Properly installed and cleaned systems will
rarely need the strainer cleaned after the initial fill. This
time interval is user-configurable.
WATER QUALITY CHARACTERISTICS
AND LIMITATIONS
*Sulfides in the water quickly oxidize when exposed to air, requiring that no
agitation occur as the sample is taken. Unless tested immediately at the
site, the sample will require stabilization with a few drops of one Molar
zinc acetate solution, allowing accurate sulfide determination up to 24
hours after sampling. A low pH and high alkalinity cause system prob-
lems, even when both values are within the ranges shown. The term pH
refers to the acidity, basicity, or neutrality of the water supply. Below 7.0,
the water is considered to be acidic. Above 7.0, water is considered to be
basic. Neutral water contains a pH of 7.0.
†Dissolved carbon dioxide can either be calculated from the pH and total
alkalinity values, shown below, or measured on the site using a test kit.
Dissolved Carbon Dioxide, PPM = TA x 2
[(6.3-pH)/0.3]
where TA = Total Alka-
linity, PPM as CaCO
3
.
Condenser coil protection ( Enviro-Shield ™)
Refer to the environmental selection guides for more infor-
mation. If the standard Novation
® (microchannel) coil does
not meet the corrosion requirements for a given applica-
tion, an e-coated Novation coil option is available. For spe-
cific geographical recommendations, please refer to the
NACO Packaged Chiller Builder program.
E-coated Novation ® coils have an extremely flexible
and durable epoxy coating uniformly applied to all coil sur-
faces. Unlike brittle phenolic dip and bake coatings, e-coat
provides superior protection with unmatched flexibility,
edge coverage, metal adhesion, thermal performance and
most importantly, corrosion resistance. E-coated coils
provide this protection since all coil surfaces are complete-
ly encapsulated from environmental contamination.
Electrical/utility interests
Energy management — Use of energy management
practices can significantly reduce operating costs, espe-
cially during off-peak modes of operation. Demand limiting
and temperature reset are 2 techniques for accomplishing
efficient energy management. See Demand Limiting (also
called load shedding) section on this page for further
details.
Demand limiting (load shedding) — When a utility’s
demand for electricity exceeds a certain level, loads are
shed to keep electricity demand below a prescribed maxi-
mum level. Typically, this happens on hot days when air
conditioning is most needed. The energy management
module (EMM) can be added to accomplish this reduction.
WATER CHARACTERISTIC QUALITY LIMITATION
Alkalinity (HCO
3
- ) 70 – 300 ppm
Sulfate (SO
4
2-
) Less than 70 ppm
HCO
3
- /SO
4
2- Greater than 1.0
Electrical Conductivity 10 – 500

S/cm
pH 7.5 – 9.0
Ammonium (NH
3
) Less than 2 ppm
Chorides (Cl - ) Less than 300 ppm
Free chlorine (Cl
2
) Less than 1 ppm
Hydrogen Sulfide (H
2
S)* Less than 0.05 ppm
Free (aggressive) Carbon
Dioxide (CO
2
)†
Less than 5 ppm
Total Hardness (dH) 4.0 – 8.5
Nitrate (NO
3
) Less than 100 ppm
Iron (Fe) Less than 0.2 ppm
Aluminum (Al) Less than 0.2 ppm
Manganese (Mn) Less than 0.1 ppm
Application data (cont)