Table 6: Legend Of The P&I Diagram For Zxle Units; Figure 4: P&I Diagram For Zxle Units - Emerson Copeland EazyCool ZX Series Application Manuallines

2.7.5 P&I diagram for ZXLE units
IMPORTANT
No insulation on liquid line! Air moisture condensation and lack of
performance! Moisture will condensate on the liquid line and cause water
droplets. The liquid line can pick up additional heat from the ambient which
will adversely affect the sub-cooling desirable for the liquid refrigerant before
it enters the expansion valve. Insulate both the suction and liquid
interconnecting piping between the ZX unit and the evaporator.
Figure 4: P&I diagram for ZXLE units
Position
1 High efficient Copeland Scroll ZX
2 Oil separator
3 Condenser with 1 or 2 fans
4 Liquid receiver with service valve
5 Plate heat exchanger for enhanced vapour injection (EVI)
6 Expansion device for enhanced vapour injection (EVI)
7 Filter drier / sight glass combination
8 Service valve, liquid line
9 Service valve, suction line
10 Liquid separator
PSL Pressure switch, adjustable, low pressure, not factory mounted
PSH Pressure safety switch, not adjustable, high pressure
PTL Suction pressure sensor, low pressure
PTH Pressure sensor, high pressure
TT1 Discharge temperature sensor
TT2 Ambient temperature sensor
TT3 Vapour in temperature sensor
TT4 Vapour out temperature sensor
Table 6: Legend of the P&I Diagram for ZXLE units
C6.1.6/0613-0915/E
Description Comments
System safety option
System safety
Compressor setpoint
Fan speed control
Compressor safety
Additional functions
EVI control
EVI control
7