Air-Cooled Models—Self-Contained Compressor

Variable Fan Speed Charging

1.Check unit nameplate for refrigerant type to be used. Unit control configurations differ depending on refrigerant type.

2.Refrigerant charging requires unit operation. Refer to 2.9 - Checklist for Completed Installation.

3.Calculate the amount of charge for the system. Refer to the unit, condenser and refrigerant line charge data in Tables 6, 7, 8 and 9.

4.Weigh in as much of the system charge as possible before starting the unit.

NOTICE

Risk of improper refrigerant charging. Can cause equipment damage.

Refrigerant R407C is a blend of three components and must be introduced and charged from the cylinder only as a liquid.

When adding liquid refrigerant to an operating system, it may be necessary to add the refrigerant through the compressor suction service valve. Care must be exercised to avoid damage to the compressor. Emerson recommends connecting a sight glass between the charging hose and the compressor suction service valve. This will permit adjustment of the cylinder hand valve so that liquid can leave the cylinder while allowing vapor to enter the compressor.

5.Turn On unit disconnect switch. Operate the unit for 30 minutes using the charging function for the system in the diagnostic section of the Liebert iCOM® control (see Liebert iCOM user manual, SL-18835). The charging function operates the compressor at full capacity and energizes the blower motor and the liquid line solenoid valve. The reheat and humidifier are disabled. A minimum 20psig (138kPa) must be established and maintained for the compressor to operate. The charging function can be reset as many times as required to complete unit charging.

Table 10 Fan speed suction pressure transducer settings

 

R-407C

 

 

 

 

 

Gauge (Sea Level)

 

Absolute

Function

 

 

 

psiG (kPa)

 

psiA (kPa)

 

 

 

 

Pump-Down Cutout

20 (138)

 

35 (241)

 

 

 

 

Pump-Down Reset

65 (448)

 

80 (552)

 

 

 

 

Minimum to Start-Cooling

35 (241)

 

50 (344)

 

 

 

 

Low-Pressure Cutout (DX only)

52 (358)

 

67 (461)

 

 

 

 

6.Charge the unit until the liquid line sight glass becomes clear. Then add one additional pound (2.2kg) of refrigerant.

NOTE

A digital scroll compressor will have a clear sight glass only when operating at 100% capacity. When operating below 100%, the sight glass may show bubbles with each 15-second unloading cycle.

7.As head pressure builds, the variable fan speed controlled condenser fan begins rotating. The fan will run at full speed when sufficient head pressure is developed—fan starts to rotate at 190 psig (1310 kPA) and is full speed at 250 psig (1724 kPA).

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Liebert® Challenger 3000™

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Emerson 3000 installation manual Variable Fan Speed Charging, Fan speed suction pressure transducer settings
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3000 specifications

The Emerson 3000 is a cutting-edge control system designed to enhance the efficiency, reliability, and precision of industrial operations. Employed across various sectors such as oil and gas, pharmaceutical, food and beverage, and power generation, the Emerson 3000 has gained recognition for its robustness and versatility.

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In summary, the Emerson 3000 represents a fusion of advanced process control, modular design, IoT connectivity, robust cybersecurity, and user-centric interface, making it an ideal choice for industries seeking to enhance their operational performance while adapting to ever-evolving technological landscapes.
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