Emerson 3000 installation manual Room dew point temperatures

Glycol/GLYCOOL-Cooled Models—Self-Contained Compressor

NOTICE

Risk of debris or precipitate clogging pipes. Can cause equipment damage.

Galvanized pipe must not be used in or with systems or units that contain glycol. The phosphates in the inhibitor can react with the zinc in the galvanized pipe, precipitating an insoluble material that can eventually foul the system.

Fluid-cooled condensers have small internal flow passages. To avoid clogging and other resulting system operation problems, install a 16-20 mesh filter in the fluid supply line to the indoor unit. The filter should be located where it can be easily serviced or replaced.

Do not install unit on open loop systems. Debris carried by the fluid will clog the brazed plate condenser.

NOTICE

Risk of improper installation. Can cause equipment or structural damage.

Supply and return lines must be supported in a way that keeps their weight from bearing on the piping of the unit, drycooler or pumps. Failure to support piping can strain the equipment’s structural integrity.

A relief valve must be installed in the system to avoid the possibility of burst pipes. This valve may be obtained from the supplier as an option or obtained from another vendor.

Emerson recommends installing manual service shut-off valves at the supply and return connections to each unit. This enables routine service and/or emergency isolation of the unit. In addition, multiple pump packages require a check valve at the discharge of each pump to prevent back flow through the standby pump(s).

To facilitate filling, installation of hose bibs at the lowest point of the system is recommended.

Consideration of the minimum glycol temperature to be supplied from the drycooler will determine if the need exists to insulate the glycol supply and return lines. Insulation will prevent condensation on the glycol lines in low ambient conditions.

All fluid piping must comply with local codes. Care in sizing pipes will help reduce pumping power and operating costs.

Table 13 Room dew point temperatures

Dry Bulb	Wet Bulb	Relative	Dew Point*
°F (°C)	°F (°C)	Humidity	°F (°C)
70 (21.1)	57.2 (14.0)	45	48.0 (8.9)
70 (21.1)	58.5 (14.7)	50	50.5 (10.3)
72 (22.2)	58.9 (24.9)	45	50.0 (10.0)
72 (22.2)	60.0 (15.5)	50	52.4 (11.3)
75 (23.8)	61.2 (16.2)	45	52.4 (11.3)
75 (23.8)	62.5 (16.9)	50	55.0 (12.7)

* Minimum glycol temperature before condensation will occur.

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