Emerson Liebert ICOM-DO Installation Manual download pdf (Page 45)

Water Connections

• Condensate drain without pump:

• Use tubing rated to carry water up to 212°F (100°C) copper, PVC or flexible polythene tubing.

• Allow a 2% gradient toward the drain.

• Place a drain trap at least 8" (200mm) below the drain tray. The drain trap must be placed

under the unit, in the false floor.

• Fill the drain trap with water.

• Humidifier (optional): See Appendix A - - Humidifier.

8.2 Glycol Mixture

Add ethylene glycol or propylene glycol to the circuit in the percentages shown in Table 11.

8.3 Water Connections: Water/Glycol-Cooled Models

The unit must receive cooling water as follows:

• From an external cooling water source, in open circuit.

• Using a drycooler, in closed circuit.

1. Connect the piping as shown in Appendix D - - Refrigerant, Hydraulic and Electrical

Connections.

2. Use hoses connected with three-piece joints to the condenser water inlet and outlet couplings.

3. Install a 16-20 mesh strainer on the chilled water supply to the Liebert CRV. The strainer is

needed to prevent particles in the chilled water from entering the unit’s heat exchanger.

4. Place shutoff ball valves at the conditioner inlet and outlet to allow easy maintenance.

5. Install a water drain system at the lowest point in the circuit.

6. Fully drain the piping before connecting it to the air conditioner.

8.3.1 Notes for Open-Circuit Applications

• Use the unit with mains or well water. Do not use water from an evaporative cooling tower unless

the water hardness is controlled.

• The water pressure must be 2-10 bar. If water pressure is outside this range, contact Emerson for

technical support.

• The required water flow at different temperatures is available from Emerson.

• If water temperature is very low, insulate both pipes.

8.3.2 Notes for Closed-Circuit Applications

The installation in Figure 3 is illustrative only; for individual installations follow the project dia-

gram.

• Install a pump system calculated on the basis of the flow and total head of the system (see site

plan data) and controlled by the compressor running (see label on the Liebert CRV).

• Insulate both pipes.

• Very important: Add water and ethylene glycol to the circuit when the ambient temperature is

below 32°F (0°C); refer to the Liebert CRV technical data manual, SL-11978). Do not exceed the

nominal operating pressure of the circuit components.

• Bleed air out of the circuit.

Table 11 Glycol mixtures

Glycol Percentage

of Total Mixture

Ethylene Glycol -

Freezing Temperature °F (°C)

Propylene Glycol -

Freezing Temperature °F (°C)

0% 32 (0) 32 (0)

10% 23 (-5) 27 (-3)

20% 12 (-11) 19 (-7)

30% 0 (-18) 8 (-14)

40% -17 (-27) n/a

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 87 88

Comments to this Manuals

No comments

Emerson Liebert ICOM-DO Installation Manual Page 45

Comments to this Manuals

Related products and manuals for Networking Emerson Liebert ICOM-DO