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Figure 4.1 Refrigerant piping when condensing unit is above or below evaporator
4.2 Refrigerant-line Sizes and Equivalent Lengths
The following tables list the information required to field-install the refrigerant piping for the system.
Table 4.4 Recommended refrigerant line sizes, O.D. cu by equivalent length
System Models
MT036E/PFD037A-*L or PFD037A-*H
MT048HE/PFD054A-*L
MT060HE/PFD067A-*L
MT060HE/PFDZ67A-*L or PFD067A-*H
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.
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.
14
Item
Description
1
Condensing unit above evaporator
2
Condensing unit below evaporator
3
Evaporator
4
Condensing unit
50 (15)
Suction line, in.
7/8
Liquid line, in.
1/2
Suction line, in.
7/8
Liquid line, in.
1/2
Suction line, in.
1-1/8
Liquid line, in.
1/2
Suction line, in.
1-1/8
Liquid line, in.
1/2
Equivalent Length, ft (m)
75 (23)
100 (30)
125 (38)
7/8
7/8
7/8
1/2
1/2
1/2
1
1
1-1/8
1-1/8
1-1/8
1/2
5/8
5/8
1-1/8
1-1/8
1-1/8
5/8
5/8
5/8
1-1/8
1-1/8
1-1/8
5/8
5/8
5/8
Vertiv | Liebert® PFD™ Installer/User Guide
150 (45)
7/8
1/2
1
1
1-1/8
5/8
1-1/8
5/8
1-1/8
5/8
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