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Piping
15 Liebert
®
CRV
™
5.1.1 Condensate Piping—Field-Installed
• Do not reduce drain lines
• Do not expose drain line to freezing temperatures
• Drain line may contain boiling water. Use copper or other suitable material
• Drain line must comply with local building codes
• Emerson recommends installing under-floor leak detection equipment
Gravity Drain—Units Without Factory-Installed Condensate Pump
• 3/4" FPT drain connection is provided on units without optional factory-installed condensate
pump with infrared humidifier or no humidifier; 1-1/4" FPT connection is provided on units with
steam generating humidifier
• 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 piping connections. Can cause damage to the equipment and to the building.
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 13 Gravity drain
Condensate Pump
• 1/2" copper sweat connection is provided on units with optional factory-installed condensate
pump
• Condensate pump is rated for approximately 6 GPM (22.7 l/min) at 30 ft (9m) total head
• Size piping based on available condensate head
5.1.2 Humidifier Supply Water—Optional Steam Generating Canister
• 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
CORRECT
INCORRECT
UNIT
Internal
Drain
External
Drain
Continuous Downward Slope
Internal
Drain
UNIT
UNIT
External
Drain
Internal
Drain
External
Drain
These are external traps also, although
unintentional. Lines must be rigid enough
not to bow over top of other objects.
INCORRECT
Do Not Externally
Trap the Unit
DPN001556
Rev. 0