DC Inverter Multi VRF System
32
5.2.3 Appendix: Reference of Normal Operation Parameters
No
Debug item
Parameter name
Unit
Reference
1
S
yst
em p
ar
ame
te
rs
ODU
parameters
Outdoor
temperature
°C
——
2
Compressor
discharge temp
°C
When compressor starts, discharge temp in cool mode is
within 70°C~105°C and at least 10°C higher than the high
pressure saturation temp.
As for temp in heat mode, it is within 65°C~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°C~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°C ~35°C in cool mode, system’s high pressure value will
be within 44°C~53°C.
In heat mode, if ambient temp is above -5°C, system’s high
pressure value is within 40°C~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°C ~35°C, the low
pressure value is 0°C~8°C.
When ambient temp in heat mode is above -5°C, the low
pressure value is -15°C~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.
10
Fan motor’s
operating freq
Hz Changes in 0~49Hz according to system’s pressure.
11
IDU
parameters
IDU ambient temp
°C
——
12
Indoor heat
exchanger’s inlet
temp
°C
According to ambient temp, for a same IDU in cool mode, the
inlet temp will be 1°C~7°C lower than the outlet temp, and
4°C~9°C higher than the low pressure value.
For a same IDU in heat mode, the inlet temp will be
10°C~20°C lower than the outlet temp.
13
Indoor heat
exchanger’s inlet
temp
°C
14
Opening angle of
indoor EXV
PLS
In cool mode, the opening angle of indoor EXV varies within
70~480PLS.
In heat mode, the opening angle of indoor EXV varies within
70~480PLS.
15
Communication
parameters
Communication
data
—
Number of IDUs detected by software is the same with the
actual number. No communication error.
16
Drainage system
——
—
Indoor unit can drain water out completely and smoothly.
Condensate pipe has no backward slope of water; Water of
outdoor unit can be drained completely through drainage
pipe. No water drop from unit base.
17
Others
——
—
Compressor and indoor/outdoor fan motor do not have
strange noise. Unit can operate normally.
