Vertiv Liebert CRV - Piping Layout and Condenser Positioning

7. Fix (braze) the pipes to the connections on the air conditioner.
8. Air-cooled Units—Connect the refrigerant-safety pressure-relief valve to the outdoors with a
5/8-in. (16-mm) copper pipe if hot-gas and liquid-isolation valves are installed in the field.
NOTE: Not required on water/glycol units, which have an indoor relief valve.
6.2.1 Piping Layout and Condenser Positioning
The piping layout and condenser positioning is detailed in the submittal documents included in the
Submittal Drawings on page156.
The following table lists the relevant documents by number and title along with recommended insulation
guidelines for the piping.
CONDENSER POSITION:
CONDENSER ABOVE
INDOOR UNIT
CONDENSER AND INDOOR UNIT AT
SAME LEVEL
CONDENSER BELOW
INDOOR UNIT
Insulation:
Discharge
line:
Indoor Necessary Necessary Necessary
Outdoor Only for aesthetic reasons Only for aesthetic reasons Only for aesthetic reasons
Liquid line:
Indoor Only for aesthetic reasons Only for aesthetic reasons No, expose to under-floor air
Outdoor Only if exposed to sunlight Only if exposed to sunlight
Document Number:
(see Submittal Drawings on
page156)
DPN003954, Pg. 1 DPN003954, Pg. 2 DPN003954, Pg. 3
Table 6.3 Air-cooled Piping-layout and Condenser-positioning Drawings
Piping Guidelines:
1. Piping must be Type ACR copper tubing and sized per Table 6.5 on page39 through Table
6.7 on page40.
NOTE: All field-installed piping must comply with applicable national, state and local codes.
2. Use the shortest possible refrigeration pipelines to minimize the total charge of refrigerant and
the number of pressure drops.
3. Minimize the number of bends and make the bends the largest radius practical to prevent
constricting refrigerant flow.
4. Insulate the piping as specified in 6.2.1 above. If the pipes are installed next to electrical cables,
they must be isolated from the building using vibration-isolating supports to avoid damage to
cable insulation.
5. There must be at least 1in. (25mm) separation between the gas and liquid pipelines. If this is
not possible, insulate both lines.
6. Support both horizontal and vertical pipes with vibration-damping clamps, which include
rubber gaskets. Place these clamps every 5 to 7 ft (1.5 to 2m).
Vertiv | Liebert CRV Installer/User Guide | 37