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Split System Models
59 Liebert
®
Challenger 3000
™
All split systems require two refrigerant lines (an insulated copper suction line and a copper liquid
line) between the evaporator and the condensing unit.
Two possible methods exist for installing the copper suction and liquid lines.
1. Using an optional Sweat Adapter Kit and hard piping between the two units.
2. Using optional pre-charged line sets (for 3-ton models only).
All refrigeration piping should be installed with high temperature brazed joints. Prevailing good
refrigeration practices should be employed for piping supports, leak testing, evacuation, dehydration,
and charging of the refrigeration circuits. The refrigeration piping should be isolated from the
building by the use of vibration isolating supports.
It is important to handle the pre-charged lines for 3-ton units with care so they will not get kinked or
damaged. Use tube benders and make all bends before making connections to either end. Coil any
excess tubing in a horizontal plane with the slope of the tubing toward the condensing unit.
To prevent tube damage when sealing openings in walls and to reduce vibration transmission, use a
soft flexible material to pack around the tubes.
When installing remote condensing units mounted above the evaporator, the suction gas line should
be trapped at the evaporator. This trap will retain refrigerant oil in the Off cycle. When the unit
starts, oil in the trap is carried up the vertical riser and returns to the compressor.
Refrigerant charge requirements: Total refrigerant charge will be required only if units are evacuated
during installation or maintenance. Total refrigerant charge = evaporator + lines + condensing unit.
Once all piping is complete, check for leaks and dehydrate the field piping as follows:
1. Pressurize the field piping to 150 PSIG (1034 kPa) using dry nitrogen with a trace of refrigerant.
Check system for leaks with a suitable leak detector.
2. After completion of leak testing, release the test pressure (per local code) and pull a deep vacuum
on the field piping with a suitable pump.
3. After 15 minutes, check the pressure readings and, if they have not changed, break vacuum with
dry nitrogen. Pull a second vacuum to 250 microns or less. Recheck the pressure after 15 minutes.
NOTE
All condensing units and 3-ton evaporator units are fully charged with refrigerant. All 5 ton
evaporator units include a nitrogen holding charge only. See Table 21 for field charge
required. If field-supplied refrigerant piping is installed, refrigerant must be added to the
system.
Table 21 Unit refrigerant charge
Model
R407C Charge
Model
R407C Charge
lb (kg) lb (kg)
BF/BU 036E 0.5 (0.2) PF_042A-_H 25.8 (11.7)
BF/BU 035E 0.5 (0.2) PF_041A-_H 25.8 (11.7)
BF/BU 060E 0.8 (0.4) PF_067A-_L 25.8 (11.7)
BF/BU 059E 0.8 (0.4) PF_066A-_L 25.8 (11.7)
MC_40/39A 12.9 (5.8) PF_Z67A-_L 50.1 (22.7)
MC_65/64A 26.1 (11.8) PF_Z66A-_L 50.1 (22.7)
PF_042A-_L 12.9 (5.8) PF_067A-_H 50.1 (22.7)
PF_041A-_L 12.9 (5.8) PF_066A-_H 50.1 (22.7)
PF_Z42A-_L 25.8 (11.7) MC_44/43W 3.4 (1.5)
PF_Z41A-_L 25.8 (11.7) MC_69/68W 5.9 (2.7)