Emerson Liebert Prop Fan Condensing Unit Manual de instalación descargar pdf (Pagina 17)

Site Preparation and Installation

If the return air duct is short or if noise is likely to be a problem, sound-absorbing insulation should

be used inside the duct. Duct work should be fabricated and installed in accordance with local and

national codes.

Additional components such as a free-cooling coil, hot water reheat coil or high efficiency filters will

reduce available static pressure.

2.4.3 Piping Connections and Coolant Requirements

Drain Line

A 3/4 in. (19.1 mm) female pipe thread (FPT) connection is provided for the evaporator coil condensate

drain. This line also drains the humidifier, if applicable. The drain line must be located so it will not

be exposed to freezing temperatures. The drain should be the full size of the drain connection.

The evaporator drain pan includes a float switch to prevent unit operation if drain becomes blocked.

The optional condensate pump kit is required when the evaporator is installed below the level of the

gravity-fed drain line.

Humidifier Water Supply Line

Units supplied with the optional humidifier package have a 1/4 in. (6.4 mm) FPT connection for water

inlet. Supply pressure range is 10 psig to 150 psig. Required flow rate is 1 gpm. A shut-off valve

should be installed in this line to isolate the humidifier for maintenance.

Chilled Water Piping—On chilled water units install manual service shut-off valves at the supply

and return lines of each unit. These shut-off valves are used for routine service or emergency isolation

of the unit.

Chilled water supply and return lines must be insulated. Insulating them will prevent condensation

of the water supply and return lines to the unit.

The minimum recommended water temperature is 42°F. Connection sizes are 1 in. (25.4 mm) FPT.

Table 5 Evaporator external static pressure

Turns

Open

1.5 hp Motor (60hz) 2.0 hp Motor (60hz)

Blower

rpm

External

Static, in.

Blower

rpm

External

Static, in.

1n/a n/a 1329 n/a

1.5 n/a n/a 1296 n/a

2 1037 0.9 1264 n/a

2.5 1005 0.7 1231 1.5

3 972 0.6 1199 1.4

3.5 940 0.5 1164 1.3

4 907 0.4 1134 1.2

4.5 875 0.3 1102 1.1

5 843 0.2 1069 1.0

5.5 810 0.1 1037 0.9

6 778 0.0 1005 0.7

CAUTION

The drain line must not be trapped outside the unit or water may back up in drain pan. Drain

is internally trapped.

This line may contain boiling water. Use copper or other suitable material for the drain line.

NOTE

Do NOT route humidifier supply line in front of filter box access panel.

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