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Also, be sure that there is capability to fully drain the system

after cleaning. (See Fig. 23 and 24.)

Fig. 23 —

Typical Set-up for Cleaning Process

Fig. 24 —

Cleaning Process Using Side Stream Filter

2. Be sure to use a cleaning agent that is compatible with all sys

tem materials. Be especially careful if the system contains

any galvanized or aluminum components. Both detergent-

dispersant and alkaline-dispersant cleaning agents are avail

able.

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, and 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 sys

tem 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. 24) 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 during the

cleaning process.

d. Remove temporary bypass when cleaning is complete.

Properly installed and cleaned systems will rarely need the

strainer cleaned after the initial fill. This time interval is user-

configurable.
WATER TREATMENT
Fill the fluid loop with an inhibited antifreeze solution suitable for

the water of the area. The solution concentration must be sufficient

to protect the chilled water loop to a freeze protection (first crys

tals) concentration of at least 15°F (8.3°C) below the lowest de

sign ambient temperature. Consult the local water treatment spe

cialist for characteristics of system water and a recommended in

hibitor for the fluid loop.

Untreated or improperly treated fluid may result in corrosion, scal

ing, erosion, or algae. The services of a qualified water treatment

specialist should be obtained to develop and monitor a treatment

program.
FILLING THE SYSTEM
In areas where the piping or unit is exposed to 32°F (0°C) or lower

ambient temperatures, freeze-up protection is required using in

hibited glycol or other suitable, heat exchanger rated, corrosion-re

sistant antifreeze solution. Heater tapes cannot be installed on the

coils and heater tape on piping will not provide any protection.

NOTE: Do not use automobile antifreeze, or any other fluid that is

not approved for heat exchanger duty. Only use appropriately in

hibited glycols, concentrated to provide adequate protection for

the temperature considered.

If the unit is in operation year-round, add sufficient suitable inhib

ited antifreeze solution such as propylene or ethylene glycol to

chilled water to prevent freezing under low-ambient temperature

operating conditions. Consult a local water treatment specialist on

characteristics of water and recommended inhibitor.

The initial fill of the fluid system must accomplish three purposes:

• The entire piping system must be filled with water/anti

freeze solution.

• The pressure at the top of the system must be high enough

to vent air from the system (usually 4 psig [28 kPa] is ade

quate for most vents).

• The pressure at all points in the system must be high

enough to prevent flashing in the piping or cavitation in

the pump.

Ensure the following when filling the system:

1. Remove temporary bypass piping and cleaning/flushing

equipment.

2. Check to make sure all drain plugs are installed.
3. Vents (if installed) at the top of the coils should be open.
4. Open the blow-down valve to flush the strainer.
5. Check for fluid leaks and repair as necessary.
Normally, a closed system needs to be filled only once. The actual

filling process is generally a fairly simple procedure. All air

should be purged or vented from the system. Thorough venting at

the high points at the top of all coils and circulation at room tem

perature for several hours is recommended.

NOTE: Local codes concerning backflow devices and other pro

tection of the city water system should be consulted and followed

to prevent contamination of the public water supply. This is espe

cially important when antifreeze is used in the system.
SET WATER FLOW RATE
Once the system is cleaned, pressurized, and filled, the flow

rate must be set. Set the flow rate per the chiller instructions.

The chiller flow is critical for correct performance and reliabil

ity. The 09FC is less sensitive to off design flow rates. Flow

rate should be set with the 09FC unit in free cooling mode.