59
5.2.3 Appendix: judgment reference of normal operational parameters
Reference of
Commissioning
Parameters of
VRF
System
No. Debug item
Parameter name
Unit
Reference
1
System
parameters ODU
Outdoor ambient temp
º
C(°F)
——
2
Discharge tube temp of
inverter compressor 1
º
C(°F)
● When system compressor starts up, temp of
discharge tube or casing top in cooling mode is
within 70~95
º
C (158~203°F), and at least 10
º
C(50°F) higher than system high pressure
saturation temp; Temp in heating mode is within
65~80
º
C(149~176°F), and at least 10
º
C(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
º
C(°F)
4
Discharge tube temp of
inverter compressor 2
º
C(°F)
5
Casing top temp of
inverter compressor 2
º
C(°F)
6
Defrost temp 1
º
C(°F)
● In cooling mode, defrost temp1 is 5~11
º
C
(41~51.8°F) lower than system high pressure value;
● In heating mode, defrost temp1 is about 2
º
C
(35.6°F) different from system low pressure value.
7
System high pressure
º
C(°F)
● System’s normal high pressure value is within
20~25
º
C(68~77°F) According to the change in
ambient temp and system operational capacity,
system’s high pressure value is 10~40
º
C(50~104°F) higher than ambient temp The higher
ambient temp is, the smaller temp difference is.
● When ambient temp is 25~35
º
C(77~95°F),
system’s high pressure value in cooling mode is
44~53
º
C(111.2~127.4°F).
● When ambient temp is -5~10
º
C(23~50°F),
system’s high pressure value in heating mode is
40~52
º
C(104~125.6°F).
8
System low pressure
º
C(°F)
● When ambient temp is 25~35
º
C(77~95°F),
system’s low pressure value in cooling mode is 0~8
º
C(32~46.4°F).
● When ambient temp is -5~10
º
C(23~50°F),
system’s low pressure value in heating mode is
-15~5
º
C(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
º
C(°F)
When ambient temp is lower than 35
º
C(95°F), IPM
temp is below 85
º
C(185°F). Highest temp won’t be
above 95
º
C(203°F).
Lennox
VRF Unit
