Distribution Pump

a30-3226

Chiller 1

Chiller 2

Decoupler

Expansion

 

Tank(s)

Zone 1

Air Separator with Vent

Zone 2

Zone 3

NOTE: Expansion tanks 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

Step 6 — 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 2. 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 2 — 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.

FILLING THE SYSTEM — The initial fill of the chilled water system must accomplish three purposes:

1.The entire piping system must be filled with water.

2.The pressure at the top of the system must be high enough to vent air from the system (usually 4 psig is adequate for most vents).

3.The pressure at all points in the system must be high enough to prevent flashing in the piping or cavitation in the pump.

The pressure created by an operating pump affects system pressure at all points except one — the connection of the compression tank to the system. This is the only location in the system where pump operation will not give erroneous pressure indications during the fill. Therefore, the best location to install the fill connection is close to the expansion tank. An air vent should be installed close by to help eliminate air that enters during the fill procedure.

13

Page 13
Image 13
Carrier 30MPA installation instructions A30-3226, Water Quality Characteristics Limitations

30MPA specifications

The Carrier 30MPA is a prominent industrial chiller unit known for its outstanding performance and efficiency in cooling applications. Designed for mid-sized commercial and industrial facilities, it exemplifies cutting-edge technology and engineering.

One of the main features of the Carrier 30MPA is its advanced scroll compressor technology. This innovative design allows for improved efficiency and reduced energy consumption compared to traditional chiller units. The compressors are known for their reliability and quiet operation, making the 30MPA ideal for environments where noise is a concern.

The unit employs a high-efficiency economizer mode, which optimizes energy use during cooler ambient conditions. By utilizing outside air for cooling, the economizer significantly reduces the chiller's energy demand, promoting sustainability and cost savings.

Additionally, the 30MPA is equipped with a microprocessor-based control system. This intelligent control technology allows for precise monitoring and adjustment of system performance, enhancing both comfort and efficiency. The controls come with various customizable settings, enabling users to tailor the chiller's operation to meet specific needs.

The 30MPA also stands out with its robust construction and design. It features a compact footprint, allowing for easy installation in confined spaces. Its weather-resistant casing and corrosion-resistant components ensure durability and long service life, even in harsh environments.

Moreover, the Carrier 30MPA incorporates an environmentally friendly refrigerant, which complies with global regulations aimed at reducing ozone depletion and greenhouse gas emissions. This commitment to environmental responsibility aligns with Carrier's goal of promoting sustainable building practices.

Another important characteristic is its flexible configuration options. The unit can accommodate different system designs and requirements, making it suitable for a wide range of applications, from chilled water systems in hospitals to comfort cooling in office buildings.

In summary, the Carrier 30MPA chiller combines innovative technology, energy efficiency, and robust design, making it a standout choice for commercial and industrial cooling applications. Its advanced features and sustainable approach not only ensure reliable performance but also contribute to lower operational costs and reduced environmental impact.