Lennox VEPS075N432K, User Manual

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DC Inverter Multi VRF System
2 7
5.2.3 Appendix: Reference of Normal Operation Parameters
No. Debug item Parameter name Unit Reference
1
System
parameters
ODU
parameters
Outdoor
temperature
°C —
2
Compressor
discharge
temperature
°C

When compressor starts, discharge temp in
cooling mode is within 70~105°C and at least 10°C
higher than the high pressure saturation temp.

As for temp in heating mode, it is within 65~90°C
and at least 10°C higher than the high pressure
saturation temp.
3
Defrosting
temperature
°C

In cooling mode, defrosting temp is 4~10°C lower
than system’s high pressure value.

In heating mode, defrosting temp is about 2°C
different from system’s low pressure value.
4
System high
pressure
°C

In cooling mode, the normal high pressure value is
within 20°C~55°C. According to the change of
ambient temp and system’s operating capacity, the
high pressure value will be 10°C~30°C higher than
ambient temp. The higher ambient temp is, the
smaller temp difference is. If ambient temp is
25~35°C in cooling mode, system’s high pressure
value will be within 44~53°C.

In heating mode, if ambient temp is above -5°C,
system’s high pressure value is within 40~52°C. If
ambient temp is low and many IDUs are turned on,
the high pressure will be lower.
5
System low
pressure
°C

When ambient temp in cooling mode is 25~35°C,
the low pressure value is 0~8°C.

When ambient temp in heating mode is above
-5°C, the low pressure value is -15~8°C.
6
Opening angle of
thermal EXV
PLS

In cooling mode, the thermal electronic expansion
valve remains 480PLS.

In heating mode, the adjustable opening degree of
EXV is 60~480PLS.
7
Compressor’s IPM
temp
°C
When ambient temperature is below 35°C, IPM
temperature is lower than 70°C. Maximum
temperature is 80°C.
8
IDU
parameters
IDU ambient temp °C —
9
Indoor heat
exchanger’s inlet
temp
°C

According to ambient temp, for a same IDU in
cooling mode, the inlet temp will be 1°C~7°C lower
than the outlet temp, and 4~9°C higher than the
low pressure value.

For a same IDU in heating mode, the inlet temp
will be 10°C~20°C lower than the outlet temp.
1 0
Indoor heat
exchanger’s inlet
temp
°C
1 1
Opening angle of
indoor EXV
PLS

In cooling mode, the opening angle of indoor EXV
varies within 40~480PLS.

In heating mode, the opening angle of indoor EXV
varies within 70~480PLS.