Compressor Type: Standard (Non-digital)Scroll
4 Step Semi-hermetic
or Digital Scroll
Indoor Unit
Model
Equivalent
Length, ft. (m):
50 (15) 100 (30) 150 (45) 50 (15) 100 (30) 150 (45)
Line sizes, OD Cu, in.
DS035
Hot Gas Line 7/8 7/8 7/8 3/4 7/8 7/8
Liquid Line 1/2 5/8 5/8 1/2 5/8 5/8
DS042
Hot Gas Line 7/8 7/8 7/8 7/8 7/8 1-1/8
1
Liquid Line 1/2 5/8 5/8 5/8 5/8 5/8
DS053
Hot Gas Line 7/8 1-1/8 1-1/8 7/8 1-1/8
1
1-1/8
1
Liquid Line 5/8 7/8 7/8 5/8 7/8 7/8
DS070
Hot Gas Line 1-1/8 1-1/8 1-1/8 1-1/8
1
1-1/8
1
1-1/8
1
Liquid Line 7/8 7/8 7/8 7/8 7/8 7/8
DS077
2
Hot Gas Line 1-1/8 1-1/8 1-1/8 1-1/8 1-1/8 1-1/8
Liquid Line 7/8 7/8 7/8 7/8 7/8 7/8
DS105
2
Hot Gas Line 1-3/8 1-3/8 1-3/8 1-3/8 1-3/8 1-3/8
Liquid Line 7/8 7/8 1-1/8 7/8 7/8 1-1/8
Consult factory for proper line sizing for runs longer than maximum equivalent length listed.
1. Downsize vertical rizer one trade size (1-1/8” to 7/8”).
2. Digital scroll not available on 077 and 105 models.
Source:DPN000788 Rev. 13
Table 5.4 Recommended Refrigerant Line Sizes for R-407C by Compressor Type
5.1.3 Refrigerant Charge Requirements
To calculate the charge requirements:
1. Determine the charge for your units by model number from the following tables and the tables in the indoor
unit's installer/user guide.
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.
These values can be used for obtaining adequate refrigerant for the system, but should not be used for final charging.
NOTE: Due to the much smaller coil volume, the performance, especially sub-cooling, of a Liebert® MC condenser is
quite sensitive to the amount of refrigerant charge. Ensure that an accurate amount of refrigerant charge is added.
5 Piping
29
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