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65
Appendix: judgment reference of normal operational parameters
Reference of Debug Parameters of VRF DC Inverter Multi VRF System
No
Debug item
Parameter name
Unit
Reference
1
System
parameters
ODU
Outdoor ambient temp
ºC (°F)
2
Discharge tube temp of
inverter compressor 1
ºC (°F)
When system compressor starts up, temp of discharge tube or
casing top in cooling mode is within 70~95ºC (158~203°F),
and at least 10ºC (50°F) higher than system high pressure
saturation temp; Temp in heating mode is within 65~80ºC
(149~176°F), and at least 10ºC (50°F) higher than system high
pressure saturation temp.
When inverter compressor starts but inverter compressor 2
stops, the discharge tube temperature of inverter compressor
2 is almost the same with ambient temp.
3
Casing top temp of
inverter compressor 1
ºC (°F)
4
Discharge tube temp of
inverter compressor 2
ºC (°F)
5
Casing top temp of
inverter compressor 2
ºC (°F)
6
Defrost temp 1
ºC (°F)
In cooling mode, defrost temp1 is 5~11ºC (41~51.8°F) lower
than system high pressure value;
In heating mode, defrost temp1 is about 2ºC (35.6°F) different
from system low pressure value.
7
System high pressure
ºC (°F)
System’s normal high pressure value is within 20~25ºC
(68~77°F) According to the change in ambient temp and
system operational capacity, system’s high pressure value is
10~40 ºC(50~104°F) higher than ambient temp The higher
ambient temp is, the smaller temp difference is.
When ambient
temp is 25~35ºC(77~95°F), system’s high
pressure value in cooling mode is 44~53ºC(111.2~127.4°F).
When ambient temp is -
5~10ºC(23~50°F), system’s high
pressure value in heating mode is 40~52ºC(104~125.6°F).
8
System low pressure
ºC (°F)
When ambient temp is 25~35ºC(77~95°F), system’s low
pressure value in cooling mode is 0~8ºC(32~46.4°F).
When ambient temp is -
5~10ºC(23~50°F), system’s low
pressure value in heating mode is -15~5ºC(5~41°F).
9
Opening angle of
heating EXV
PLS
In cooling mode, heating electronic expansion valve remains
480PLS.
In heating mode, the opening angle of adjustable electronic
expansion valve varies within 120~480PLS.
10
Operating freq. of
inverter compressor 1
Hz
Varies from 20Hz to 95Hz
11
Current of inverter
compressor 1
A
According to different operating freq. and different load, current
will vary from 7A to 40A.
12
IPM temp of inverter
compressor 1
ºC (°F)
When ambient temp is lower than 35ºC (95°F), IPM temp is below
85ºC(185°F). Highest temp won’t be above 95ºC (203°F).
13
Inverter compressor 1
driven bus voltage
V
Normal bus voltage is 1.414 times of power voltage. For example,
if 3-phase power voltage is 220V, then the bus voltage after
rectification is: 220V X 1.414=311V. It’s normal if actual voltage
varies 15v from the calculated voltage.
14
Operating freq. of
inverter compressor 2
Hz
Varies from 30Hz to 100Hz
15
Current of inverter
compressor 2
A
According to different operating freq. and different load, current
will vary from 7A to 25A.
16
IPM temp of inverter
compressor 2
ºC (°F)
When ambient temp is lower than 35ºC (95°F), IPM temp is below
80ºC (176°F). Highest temp won’t be above 95ºC (203°F).
17
Inverter compressor 2
driven bus voltage
V
Normal bus voltage is 1.414 times of power voltage. For example,
if 3-phase power voltage is 220V, then the bus voltage after
rectification is: 220V X 1.414=311V. It’s normal if actual voltage
varies 15v from the calculated voltage.
