Emerson Liebert CRV - Vacuum and Refrigerant Charge Procedures

Refrigerant Connections for Air-Cooled Units
Liebert
®
CRV
™
42
6.6 Vacuum and Refrigerant Charge
NOTICE
Risk of improper refrigerant charge. Can cause equipment damage and reduced efficiency.
Check the refrigerant type to be used on the data plate of the air conditioner and on the
refrigerating compressor.
Table 18 Indoor unit charge R-410A refrigerant and oil charge for air-cooled models
Model
Base
Refrigerant
Charge
lb (kg)
Base Oil Charge
Maximum System
Refrigerant Charge
before Oil Addition,
lb (kg)
Fluid Ounces of Oil
to Add for Every
10 lb. (4.5kg) of
Refrigerant Over
Maximum
System Charge, oz (ml)
Initial Oil
Charge
oz (kg)
Maximum
Topping
Up, oz (kg)
CR019RA 5 (2.7) 60 (1.68) 56 (1.57) 38 (17.1) 1.6 (48)
CR020RA 7 (3.2) 60 (1.68) 56 (1.57) 38 (17.1) 1.6 (48)
CR035RA 10 (4.5) 110 (3.08) 106 (2.97) 28 (12.6) 4 (120)
The recommended oil is EMKARATE RL 32-3MA.
Table 19 Interconnecting piping refrigerant charge
External Pipe Diameter
x Wall Thickness
In. (mm)
Hot Gas Line
R-410A,
lb/feet (kg/m)
Liquid Line (+) Condensing
Temperatures - R-410A, lb/ft (kg/m)
95°F (35°C) 115°F (46°C) 135°F (57°C)
1/2 x 0.049 (12 x 1) — 0.05 (0.08) 0.05 (0.07) 0.04 (0.07)
9/16 x 0.049 (14 x 1) 0.0084 (0.0124) 0.07 (0.11) 0.07 (0.11) 0.06 (0.10)
5/8 x 0.049 (16 x 1) 0.0114 (0.0169) 0.10 (0.16) 0.10 (0.14) 0.09 (0.13)
3/4 x 0.049 (18 x 1) 0.0149 (0.0221) 0.14 (0.20) 0.13 (0.19) 0.11 (0.17)
7/8 x 0.065 (22 x 1.25) 0.0232 (0.0346) — — —
1-1/8 x 0.065 (28 x 1.5) 0.0392 (0.0584) — — —
(+) Liquid pressure and density varies according to condensing temperature.
Table 20 Refrigerant required, R-410A, approximate for Liebert MC Condensers, with and without
Liebert Lee-Temp
Condenser
Models
Single Circuit, lb/circuit (kg/circuit)
Condensers w/o
Liebert Lee-Temp
Condensers with
Liebert Lee-Temp
MCS028 2.5 (1.2) 18.3 (8.4)
MCM040 3.5 (1.6) 19.3 (8.8)
MCM080 8.5 (3.8) 39.6 (18.1)
MCL055 5.0 (2.3) 24.2 (11.0)
MCL110 10.7 (4.9) 49.0 (22.2)
Source: DPN002411, Rev. 3
Table 21 Fin/tube condensers air-cooled condenser refrigerant charge
Model
VFD
lb (kg)
Liebert Lee-Temp
™
(Inc. Receiver), lb (kg)
28 K 7 (3.2) 41 (18.6)
60 K 16 (7.3) 75 (34.0)
90 K 25 (11.3) 109 (49.4)
1. Topping up is suggested for short pipeline, too, due to the extra-charge of refrigerant.
2. The air conditioner is supplied pressurized with helium at 1 bar.
3. DCSL or TCSV condenser