Emerson Liebert PEX Series User Manual page 30

Note
A trap should be installed for every 7.5m of vertical distance. Please consult Emerson for details.
Connecting pipes
The pipes to be connected include:
1. Condensate drain pipe of indoor unit
2. Water inlet pipe for infrared humidifier
3. Connection copper pipe (discharge pipe and liquid pipe for air-cooled system) between indoor unit and outdoor unit
4. Water inlet and outlet pipe of the chilled water (dual cooling unit)
5. Pipe extension kit (optional)
Connecting condensate drain pipe of indoor unit
The condensate of infrared humidifier and evaporator is converged by a cross connector and drained through the drain
pipe, as shown in Figure 2-25. The pipe OD is 25mm. If the drain pipe is used by three or more units, the minimal pipe
OD should be 40mm.
Note
Because the infrared humidifier contains flowing hot water, the water pipe must be resistant to heat higher than 90°C.
To condensed water
pan of evaporator
pan of evaporator
To the conden sed
water drain pipe
Note
1. A Φ25 hose clamp is delivered as an accessory to connect the drain pipe.
2. When connecting the drain pipe, you must make sure that the U bend is installed vertically and the 'U' shape is not distorted,
so as to ensure that the condensate can be drained immediately and effectively.
Connecting water inlet pipe of infrared humidifier
Water pipes should be connected for the infrared humidifier. To facilitate maintenance, an isolation valve should be
fitted to the water inlet pipe. The infrared humidifier reserves a copper pipe (OD: 6.35mm), as shown in Figure 2-26.
There is a 1/4" copper nut at the end of the copper pipe. Take out the 1/4" × 1/2" conversion copper thread connector
from the accessory bag and connect it to the copper nut. You can also choose the connection method to connect pipes
according to the site condition. Make sure that the connection is well sealed to prevent leakage. The main pipe
pressure should be between 100kPa ~ 700kPa.
Where the main pipe pressure may rise above 700kPa, a pressure reducer should be fitted. Where the main pipe
pressure falls below 100kPa, a water tank and pump system should be used.
Water in pipe of
Water inlet pipe of far
infrared humidifier
infrared humidifier
To condensate
Hose clamp
To condensate
To condensed
drain pipe
Figure 2-25 Connection of drain pipe
Liebert.PEX2 Series Air Conditioner User Manual
Chapter 2 Mechanical Installation
Connection of
Connector of condensed
condensate drain pipe
water drain pipe
To far infrared humidifier
To infrared humidifi er
water pan
To condensate
To condensed water
pan of evaporator
pan of evaporator
Cross connector
25