6.3 Heat Rejection Piping
6.3.1 Piping for Direct Expansion (DX) Circuit—R-407C Air-Cooled Units
Risk of refrigerant system explosion or rupture from overpressurization. Can cause equipment damage,
injury or death.
WARNING! Installer must install a 400 psig pressure relief valve in each of the two R-407C
refrigerant circuits of the Liebert XDC system. Do not install shutoff valves between the
compressors and the pressure relief valves.
For systems requiring EU CE compliance, the pressure relief valves must be CE-certified by a
notified body to the EU Pressure Equipment Directive.
6.4 Install Double Discharge Risers
For air-cooled systems, double discharge risers must be installed in the hot gas lines that have vertical
heights of 15 feet (4.6m) or more (see Figure 6.4 on the next page). This will allow proper oil return to the
compressors when the system is running at low loads. A double riser system is constructed of a large
diameter riser with a trap at the base and a riser with a smaller diameter in parallel.
At full-load operation, the refrigerant vapor flows up both risers at velocities that are adequate to carry
the oil. At low loads, refrigerant vapor velocities are lower and the trap at the bottom of the riser becomes
filled with oil. When this happens, refrigerant flows up only the smaller riser.
The trap at the top of the riser must be tied into the top of the line to prevent oil from filling the larger
riser. For each double riser used, the maximum height of the riser must not exceed 15 feet (4.6m). Multiple
risers must be installed in series as the height of the hot gas line increases. Total maximum height of the
hot gas line must not exceed 60 feet (18.3m).
Horizontal discharge lines should be pitched downward in the direction of flow to aid in oil drainage with
downward pitch of at least 1/2 inch in 10 feet (13mm in 3m).
Vertiv
| Liebert® Xtreme Density™ System Design Manual |
123
Содержание Liebert XD Series
Страница 1: ...Liebert Xtreme Density System Design Manual...
Страница 18: ...Vertiv Liebert Xtreme Density System Design Manual 18 This page intentionally left blank...
Страница 20: ...Vertiv Liebert Xtreme Density System Design Manual 20 This page intentionally left blank...
Страница 45: ...Figure 3 22 Liebert XD return header orientation Vertiv Liebert Xtreme Density System Design Manual 45...
Страница 66: ...Figure 4 2 Overall dimensions Vertiv Liebert Xtreme Density System Design Manual 66...
Страница 76: ...Figure 4 12 Liebert XDO internal mounting location Vertiv Liebert Xtreme Density System Design Manual 76...
Страница 88: ...Figure 4 21 Liebert XDV dimensions Vertiv Liebert Xtreme Density System Design Manual 88...
Страница 90: ...Figure 4 23 Suspending single Liebert XDV from Unistruts Vertiv Liebert Xtreme Density System Design Manual 90...
Страница 103: ...Figure 5 4 Piping locations floor stand and valve assembly Vertiv Liebert Xtreme Density System Design Manual 103...
Страница 112: ...Figure 5 16 Front view of Liebert XDP and electrical enclosure Vertiv Liebert Xtreme Density System Design Manual 112...
Страница 115: ...Figure 5 19 Liebert XDP high voltage connections 60Hz Vertiv Liebert Xtreme Density System Design Manual 115...
Страница 116: ...Figure 5 20 Liebert XDP high voltage connections 50Hz Vertiv Liebert Xtreme Density System Design Manual 116...
Страница 120: ...Figure 6 2 Condenser planning dimensional data Six fan units Vertiv Liebert Xtreme Density System Design Manual 120...
Страница 121: ...Figure 6 3 Typical condenser footprint dimensions Vertiv Liebert Xtreme Density System Design Manual 121...
Страница 138: ...Figure 6 13 Drycooler planning dimensional data Eight fan units Vertiv Liebert Xtreme Density System Design Manual 138...
Страница 152: ...Vertiv Liebert Xtreme Density System Design Manual 152 This page intentionally left blank...
Страница 166: ...Figure 7 7 Modules on a single chain Vertiv Liebert Xtreme Density System Design Manual 166...
Страница 167: ...Figure 7 8 Modules on two chains Vertiv Liebert Xtreme Density System Design Manual 167...
Страница 170: ...Figure 7 11 CAN Isolator location within the Liebert XDP XDC Vertiv Liebert Xtreme Density System Design Manual 170...
Страница 182: ...Vertiv Liebert Xtreme Density System Design Manual 182 This page intentionally left blank...
Страница 198: ...Figure 9 7 Liebert XDP model number nomenclature Vertiv Liebert Xtreme Density System Design Manual 198...
Страница 199: ......