26 Chapter 2 Mechanical Installation
Note
Some product may include components required by local codes.
Over-temperature
protection switch
Water outlet
Stainless steel stud
Over-temperature
protection relay
Ceramic terminal socket
Water supply pipe
Water pan (removable)
Water supply solenoid valve
Water level sensor
Over-temperature protection
Water level regulator
Water pan fixing screw
Water supply pipe
OD 6.35mm
A direction
A direction
Water pan fixing screw (left and right)
switch (water pan bottom)
OD 6.35mm
Ф
Water high level sensor
switch (undre pan)
Figure 2-26 Infrared humidifier
z
Connecting connection copper pipes (discharge pipe and liquid pipe) between indoor unit and outdoor unit
The indoor unit and outdoor unit are connected through welded copper pipes. The connection ball valves of the
discharge pipe/liquid pipe of indoor unit are shown in Figure 2-27 and Figure 2-28. Note that the ball valve must be
wrapped with a wet cloth before welding. In addition, many notes and instruction labels are pasted onto the base and
side panel close to the ball valve. Protect them from heat burned during the welding operation.
Note
The exposure time of system pipes do not exceed 15min. Longer exposure will lead to the POE refrigeration oil being affected
with moisture, which can affect the life of the key components and the stability of the system operation. Especially note that the
compressor and the corresponding expansion valve of the dual refrigerant system unit should be located at both sides of the unit.
For example, you face the unit front door, No.1 system compressor is on the left hand side, while the expansion valve that
corresponds to No.1 compressor is on the right hand side. Similarly No.2 system compressor is on the right hand side, while the
expansion valve that corresponds to the No.2 compressor is on the left hand side.
Horizontal sections of the discharge pipes should be sloped downward from the compressor, with a slope of at least
1:200 (5mm down for each 1m run). The discharge pipes should be insulated where they are routed in the conditioned
space (including under a raised floor).
The pressure drop should not exceed 40kPa (5psi ~6psi), provided that there is no loss of refrigeration in the liquid
return pipe. The pressure drop of the liquid return pipe is the sum of liquid flow resistance from the tubing and fitting
(including filter drier), plus the loss of head pressure due to elevation above the condenser. If the liquid temperature is
38°C, the static pressure loss is 11kPa (1.6 psi) per meter of lift.
System 1 pipe
Air-cooled of upflow
System 2
expansion valve
System 1
System
1 sight
glass
System 2
System
2 sight
glass
System 2 pipe
System 1
expansion valve
System 2
expansion valve System 1 System 2
System 1
pipe
System
1 sight
glass
System
2 sight
glass
System 2 pipe
System 1
expansion valve
Water-cooled of upflow
Figure 2-27 Pipe connection of upflow unit
Liebert.PEX2 Series Air Conditioner User Manual
Summary of Contents for Liebert PEX Series
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