Emerson 3000 User Manual

6. After four hours, check the pressure readings and, if they have not changed, break vacuum with 

dry nitrogen. Pull a second and third vacuum to 250 microns or less. Recheck the pressure after 

two hours.

7. Remove the jumper hose installed previously from between the service valve fitting and the 

condenser. After completing this step, proceed to Liebert Lee-Temp

 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 

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.

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. The charging function operates 

the compressor at full capacity and energizes the blower motor and liquid line solenoid valve. The 

reheat and humidifier are disabled. A minimum 20psig (138kPa) must established and 

maintained for the compressor to operate. The charging function can be reset as many times as 

required to complete unit charging. 

6. Charge the unit until the liquid line sight glass becomes clear. Then add one additional pound 

(2.2 kg) of refrigerant.

20 (138)

35 (241)

65 (448)

80 (552)

50 (345)

65 (448)

52 (358)

67 (461)

NOTE
A digital scroll compressor will have a clear sight glass only when operating at 100% capacity.