Carrier 30RAP010-060 Fill the Chilled Water Loop, Water Quality Characteristics Limitations

Page 15

maintenance purposes, and that they be located where they can be prevented from freezing.

Step 4 — Fill the Chilled Water Loop

WATER SYSTEM CLEANING — Proper water system cleaning is of vital importance. Excessive 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 Table 3. Failure to maintain proper water quality may result in heat exchanger failure.

CAUTION

Failure to properly clean all piping and components of the chilled water system before unit start-up may result in plugging of the heat exchanger, which can lead to poor per- formance, nuisance alarms and damage from freezing. Freezing damage caused by an improperly cleaned system represents abuse and may impair or otherwise negatively affect the Carrier product warranty.

1.Install a temporary bypass around the chiller to avoid cir- culating dirty water and particulates into the pump pack- age and chiller during the flush. Use a temporary circulat- ing pump during the cleaning process. Also, be sure that there is capability to fully drain the system after cleaning. (See Fig 14.)

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 components. Both detergent-dispersant and alkaline-dispersant 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 (see Fig. 15) 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 neces- sary during the cleaning process.

d. Remove temporary bypass when cleaning is complete.

Table 3 — Water Quality Characteristics

and Limitations

WATER CHARACTERISTIC

QUALITY LIMITATION

Alkalinity (HCO -)

70 – 300 ppm

 

3

 

Sulfate (SO 2-)

Less than 70 ppm

 

4

 

HCO

-/SO 2-

Greater than 1.0

3

4

 

Electrical Conductivity

10 – 500 μS/cm

pH

 

7.5 – 9.0

Ammonium (NH3)

Less than 2 ppm

Chorides (Cl-)

Less than 300 ppm

Free chlorine (Cl2)

Less than 1 ppm

Hydrogen Sulfide (H2S)*

Less than 0.05 ppm

Free (aggressive) Carbon

Less than 5 ppm

Dioxide (CO2)†

 

Total Hardness (dH)

4.0 – 8.5

Nitrate (NO3)

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

*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 problems, 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 Alkalinity, PPM as CaCO3.

A 40-mesh 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 con- nection for drainage outside the unit.

The Carrier ComfortLink™ controls provided have a built- in feature 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.

Distribution Pump

Chiller 1

Chiller 2

Decoupler

Expansion

 

Tank(s)

Zone 1

Air Separator with Vent

Zone 2

Zone 3

NOTE: Expansion tanks in the 30RAP hydronic kits must be disconnected for chillers placed parallel in the primary water loop.

Fig. 13 — Typical Air Separator and Expansion Tank Location on Primary-Secondary Systems

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Contents Installation Instructions Quality Assurance A30-4861 Unit Operating WeightsUnit 30RAP Physical Data, 30RAP EnglishPhysical Data, 30RAP SI Check Compressor Mounting As Cooler Fluid and Drain Piping Con- nectionsA30-4916 A30-4948 Dimensions 30RAP010 and 015 UnitsA30-4949 Dimensions 30RAP018-030 UnitsDimensions 30RAP035-060 Units A30-4879 Accessory Storage Tank Dimensions 30RAP010,015 UnitsA30-4880 Accessory Storage Tank Dimensions 30RAP018-030 UnitsA30-4880 A30-4881 Accessory Storage Tank Dimensions 30RAP035-060 UnitsTypical Piping Diagram 30RAP Units with Hydronic Package A30-4635 Factor for Setting Tank PressureFill the Chilled Water Loop Water Quality Characteristics LimitationsTypical Set Up for Cleaning Process Head kPa as Read on Balancing Valve for 30RAP035-060 Head Ft Water as Read on Balancing Valve for 30RAP010-030Head kPa as Read on Balancing Valve for 30RAP010-030 Head Ft Water as Read on Balancing Valve for 30RAP035-060Heat Exchanger Pressure Drop 30RAP035-060 English Heat Exchanger Pressure Drop 30RAP035-060 SI Minimum Fluid Volume In CirculationMake Electrical Connections Wind Baffle Accessory Quantities30RAP Electrical Data No Hydronic Package Maximum Field Wiring Sizes38RAP Unit Voltage Pump Size 3 hp Pump Size 5 hp Pump Size 7.5 hp Hz 3 Ph 208/230-60 75.3 110 260.2 80.1 125 265.0 100 86.7 271.6 Fan Electrical Data Optional Value Sound Fans Fan Electrical Data Standard Low-Sound AeroAcoustic FansPump Electrical Data Accessory Tank Electrical DataPER Circuit RLA LRA Compressor Electrical DataCheck Refrigerant Circuit Install AccessoriesTypical Main Power and Control Connections Suction Access Port Sizes 018-030 Shown Units Without Hydronic Package English Unit Pressure Drop Curves, 30RAP010-060KPa Drop Water Pressure Liters/Second Appendix a Unit Pressure Drop Curves, 30RAP010-060Units with Single Pump Hydronic Package English Units with Single Pump Hydronic Package SI Units with Dual Pump Hydronic Package English Units with Dual Pump Hydronic Package SI Accessory Tank Flow Rate L/s Appendix a Pressure Drop Curves, Accessory Storage TanksPage Copyright 2009 Carrier Corporation
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30RAP010-060 specifications

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