Black Box CRDX-A-FS-24KW System Charging Procedures, Water-Water/Glycol Cooled Systems, Page

Chapter 2: Installation

Figure 2-14. Interconnecting field wiring remote condenser.

2.10 System Charging Procedures

2.10.1 Water–Water/Glycol Cooled Systems

No field refrigerant charging is required for fluid-cooled units. The following precautions must be observed when installing and filling the water–water/glycol loop:

•The piping system must be cleaned prior to allowing water or water/glycol to flow through the system.

•Glycol must be mixed with water before it is added to the system. Use only water/glycol solution with inhibitors for corrosion protection.

•When filling the water–water/glycol loop, all air must be bled from the piping system.

1.Open a vent valve at highest point of the system.

2.Fill the system until the solution is discharging from the vent with minimal signs of foaming caused by air in the system.

2.10.2 Remote Air-Cooled Systems

Remote air-cooled systems are provided with a dry nitrogen holding charge that must be removed before piping and charging the unit. Before charging, check the unit nameplate to confirm the type of refrigerant to use.

NOTE: Refrigerant charging must be performed by a qualified air-conditioning technician.

Cold Row systems use R410A refrigerant. R410A is a blended refrigerant recognized for being safe for the environment. Refrigerants that are multicomponent blends have component parts with different volatilities that result in a change in composition and saturation temperature as evaporation and condensation occur. The composition of liquid R410A refrigerant, however, remains relatively constant.

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