Piping
Liebert
®
CRV
™
28
5.2.3 Gravity Drain—300mm (12") DX Units Without Factory-Installed Condensate Pump
• 3/4" FPT drain connection is provided on units without optional factory-installed condensate
pump; the drain line’s inside diameter must be the same as or larger than the factory-provided
drain connection’s inside diameter
• Pitch the drain line toward the drain a minimum of 1/8" (3mm) per 1 foot (305mm) of length
• Drain is trapped internally. Do not trap the drain external to equipment
• Drain line must be sized for 2 gpm (7.6 l/m) flow
NOTICE
Risk of improper field installed drain piping. Overflowing drain water can cause equipment
and building damage.
The drain line has an internal trap and must not be trapped outside the unit or water may
back up into the drain pan and overflow the unit cabinet.
Figure 20 Gravity drain connection, 300mm (12") DX units without condensate pump
5.2.4 Humidifier Supply Water—Optional Steam Generating Canister—600mm (24") Models
• 1/4" supply line; maximum water pressure is 145psi (1000kPa)
• Fill valve is sized for pressure range of 30 to 120psi (207-827kPa)
• Do not supply steam generating humidifier with softened water
• Do not use hot water source
• Water conductivity must be in the range of 330-670 micro-siemens
5.2.5 Requirements of Systems Using Water or Glycol—600mm (24") Models
These guidelines apply to the field leak checking and fluid requirements for field piping systems,
including Liebert chilled water, condenser (water or glycol) and drycooler circuits.
Adapter, 1"NPT
Male -3/4" Barb
When coolant supply and
return pipes enter through
the top of the Liebert CRV
300mm (12"), remove this
plate and remove knockout
for gravity drain.
Front of Unit
Front Door and Fans Removed
315005
Pg. 1, Rev. 3
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