Vertiv Liebert PFD - Refrigerant Line Sizing and Equivalent Lengths

Figure 4.1 Refrigerant piping when condensing unit is above or below evaporator
Item Description
1 Condensing unit above evaporator
2 Condensing unit below evaporator
3 Evaporator
4 Condensing unit
4.2 Refrigerant-line Sizes and Equivalent Lengths
The following tables list the information required to field-install the refrigerant piping for the system.
System Models
Equivalent Length, ft (m)
50 (15) 75 (23) 100 (30) 125 (38) 150 (45)
MT036E/PFD037A-*L or PFD037A-*H
Suction line, in. 7/8 7/8 7/8 7/8 7/8
Liquid line, in. 1/2 1/2 1/2 1/2 1/2
MT048HE/PFD054A-*L
Suction line, in. 7/8 1-1/8
1
1-1/8
1
1-1/8
1
1-1/8
1
Liquid line, in. 1/2 1/2 5/8 5/8 5/8
MT060HE/PFD067A-*L
Suction line, in. 1-1/8 1-1/8 1-1/8 1-1/8 1-1/8
Liquid line, in. 1/2 5/8 5/8 5/8 5/8
MT060HE/PFDZ67A-*L or PFD067A-*H
Suction line, in. 1-1/8 1-1/8 1-1/8 1-1/8 1-1/8
Liquid line, in. 1/2 5/8 5/8 5/8 5/8
Consult factory for proper line sizing for runs longer than maximum equivalent length shown.
1.Use one line size smaller on suction lines for vertical risers.
Table 4.4 Recommended refrigerant line sizes, O.D.cubyequivalentlength
4.2.1 Refrigerant Charge Requirements
To calculate the charge requirements:
1. Determine the charge for your units by model number from the following tables.
2. Determine the charge for the piping by line size and length.
3. Add these all together to obtain the total refrigerant charge for your system.
Vertiv | Liebert® PFD™ Installer/User Guide
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