Lennox VEP034N432US - Page 36

DC Inverter Multi VRF System
32
Description of each stage of debugging progress
——
Debugging code
Code meaning and operation method
Progress
LED
Code
Display status
15_ Cooling
debugging
15/AC
Display
circularly
Debugging for cooling mode. If no malfunction occurs for
50min when compressor is running, then the system is
certified as normal. After shutting down the unit for 5s, the
system will enter normal standby status.
15/error
code
Display
circularly
Malfunction occurs when debugging for cooling mode.
16_ Heating
debugging(For
heat pump units
only)
16/AH
Display
circularly
Debugging for heating mode. If no malfunction occurs for
50min when compressor is running, then the system is
certified as normal. After shutting down the unit for 5s, the
system will enter normal standby status.
16/error
code
Display
circularly
Malfunction occurs when debugging for heating mode.
17_ Debugging
finished
OFF ON
The entire unit has finished debugging and under standby-by
condition.
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
temp
°C
When compressor starts, discharge temp in cool
mode is within 70~105°C and at least 10°C higher
than the high pressure saturation temp.
As for temp in heat mode, it is within 65~90°C and at
least 10°C higher than the high pressure saturation
temp.
3 Defrosting temp °C
In cool mode, defrosting temp is 4~10°C lower than
system’s high pressure value.
In heat mode, defrosting temp is about 2°C different
from system’s low pressure value.
4 System high pressure °C
In cool 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 cool
mode, system’s high pressure value will be within
44~53°C.
In heat 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 cool mode is 25~35°C, the low
pressure value is 0~8°C.
When ambient temp in heat mode is above -5°C, the
low pressure value is -15~8°C.
6
Opening angle of
thermal EXV
PLS
In cool mode, the thermal electronic expansion valve
remains 480PLS.
In heat mode, the adjustable opening angle of EXV is
40~480PLS.
7
Compressor’s
operating freq
Hz Changes in 10Hz~80Hz.
8
Compressor’s
operating current
A
When compressor works normally, the current is no
more than 18.4A.
9
Compressor’s IPM
temp
°C
When ambient temp is below 35°C, IPM temp is lower
than 80°C and the highest temp won’t be above 95°C.