Piping Connections And Coolant Requirements; Figure 6 Drain Installation - Liebert 8 Tons User Manual

2.4.3

Piping Connections and Coolant Requirements

Drain Line
CAUTION
!
The drain line must not be trapped outside the unit, or water may back-up in drain pan.
Drain is internally trapped.
This line may contain boiling water. Use copper or other suitable material for the drain line.
Sagging condensate drain lines may inadvertently create an external trap.
A 3/4 in. (19.1 mm) female pipe thread (FPT) connection is provided for the evaporator coil condensate
drain. This line also drains the humidifier, if applicable. The drain line must be located so it will not
be exposed to freezing temperatures. The drain should be the full size of the drain connection.
The evaporator drain pan includes a float switch to prevent unit operation if drain becomes blocked.
Figure 6 Drain installation
Unit
Continuous slope
away from unit
Correct
These are external traps also, although
unintentional. Lines must be rigid
enough to not bow between supports.
Humidifier drain water can approach
100° Celsius.
Do not externally
trap the unit
Unit
Incorrect
11
Site Preparation and Installation
Unit
Incorrect