Liebert Air Cooled - Manual (Page 31)

Inspection and Installation
27
3.9.2 Field Piping Installation
One discharge line and one liquid line must be field-installed for each circuit of the indoor unit and
the outdoor condenser(s). Dual circuit condensers are available for most dual circuit indoor unit appli-
cations. Refer to Figures 22, 23 and 24 below for additional field-installed piping needed at the con-
denser. This piping is needed for proper system performance and for installation/interconnecting
receivers and head pressure control valves for Lee-Temp systems.
Figure 22 VFD and Fan Speed Control condenser piping
NOTE
Keep the evaporator unit and condenser closed with their factory charge of dry nitrogen while
all field piping is installed. Keep the field piping clean and dry during installation, and do not
allow it to stand open to the atmosphere.
When all the field interconnecting piping is in place, vent the condenser’s dry nitrogen charge
and connect to the field piping. Finally, vent the evaporator unit’s dry nitrogen charge and
make its piping connections last.
Follow all proper brazing practices, including a dry nitrogen purge to maintain system
cleanliness.
Fasten liquid and hot gas lines
to leg using flat surface clamps
with isolators ( field-supplied).
Support field piping separately
to avoid coil damage and loss of charge.
Traps to Extend Above Base of
Coil by a Minimum of 7-1/2" (190mm)
Inverted Traps
(Field Supplied)
Entering Hot
Gas Line
Leaving
Liquid Line
See
Detail
A-A
DPN001065
Rev. 0
Detail A-A
Metal
Clamp
Isolator