CyberChiller Series Installation, Operation & Maintenance Manual

2.Open the vent valve at highest point of the system.

3.Open the water source and run until the water solution is discharging from the vent with minimal signs of foaming due to air in the system.

6.Re-open isolation valves.

7.Resume unit operation. Repeat steps 1 – 6 every 30 minutes for first 3 hours operation.

4.Allow pump to run until 30 psig is indicated on the pressure gauge at the pump inlet fitting.

5.Ensure water side is completely filled without air voids. Check and verify proper flow rate is obtained before starting the compressors.

CAUTION

Extensive operation of the circulating pump with the compressors disabled may cause damage from the abnormally high water/glycol temperature developed.

5.Observe the pressure on the pressure gauge connected to the chiller pump inlet fitting. Maintain 20 to 30 psig on the pressure gauge.

CAUTION

Improper setting of the heat exchanger flow switch may result in freezing of the heat exchanger, and system failure not covered by warranty. Only qualified individuals should perform this procedure.

2.7.1.2Strainer Cleaning

NOTE

During initial operation the “Y” strainer will trap the majority of the particulate left in the system as a result of various manufacturing processes. The Strainer MUST be cleaned every 30 minutes during the first 3 hours of operation to ensure adequate flow of coolant. (See below.)

1.Switch both compressors to the “OFF” position.

2.Isolate the “Y” strainer by closing isolation valves.

3.Unscrew the brass fitting from the “Y” strainer and pull the screens out.

4.Wash the screens thoroughly to remove the collected particulate.

5.Reinstall the screens in the strainer housing and replace the brass fitting.

2.7.2Outdoor Heat Exchanger Glycol Charging Procedures

In glycol cooled units the refrigerant system is already charged with R-22 or R407C.

The following precautions must be observed when installing and filling the glycol loop:

•The glycol must be mixed with water before it is added to the system. All air must be bled from the piping system.

•The piping system must be cleaned prior to adding the glycol solution to the system.

•Use only water glycol solution with inhibitors for corrosion protection.

2.7.3R-22 Refrigerant Charging Procedures

NOTE

Refrigerant charging must be performed by a jour- neyman, refrigeration mechanic or an air conditioning technician.

2.7.3.1 Remote Air-Cooled Split Systems

Remote air-cooled units come equipped with a factory dry nitrogen holding charge, which must be removed before piping and charging the unit.

PREPARING SYSTEM FOR CHARGING

1.Once all connections have been made, pressurize the system to 150 psig with dry nitrogen. Leaks may be detected by observing the standing pressure.

2.After ensuring there are no leaks, relieve pressure and evacuate the system. Pull a vacuum of 50 microns or less using the suction and discharge service ports and the service port of the receiver (if applicable). Hold the vacuum for 2 hours. Ensure no portion of system has been isolated from the evacuation process (liquid, suction or discharge lines).

(©October, 2006)

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