Mitsubishi Electric R410A Service Handbook page 67

[3-3 Functions of the Major Components of Outdoor Unit ]
Part Symbols
name (functions)
Thermis- TH4
tor (Discharge)
TH2
(SCC bypass
outlet tempera-
ture)
TH3
(Liquid pipe
temperature)
TH7
(Outdoor tem-
perature)
TH5
(Accumulator in-
let temperature)
TH6
(Liquid pipe
temperature)
THHS
Inverter
heat sink tem-
perature
THBOX
Control box in-
ternal tempera-
ture detection
HWE14080
Notes Usage
1) Detects discharge air
temperature
2) Provides high-pres-
sure protection
0°C[32°F] :698k
10°C[50°F] :413k
20°C[68°F] :250k
30°C[86°F] :160k
40°C[104°F] :104k
50°C[122°F] : 70k
60°C[140°F] : 48k
70°C[158°F] : 34k
80°C[176°F] : 24k
90°C[194°F] :17.5k
100°C[212°F] :13.0k
110°C[230°F] : 9.8k
LEV 1 is controlled based
on the TH2, TH3, and TH6
values.
1) Controls frequency
2) Controls defrosting
during heating opera-
tion
3) Detects subcool at the
heat exchanger outlet
and controls LEV1
based on HPS data
and TH3 data
1) Detects outdoor air
temperature
2) Controls fan operation
LEV2 is controlled based
on the 63LS and TH5 val-
ues.
Controls LEV1 based on
TH2, TH3, and TH6 data.
Controls inverter cooling
fan based on THHS tem-
perature
- 58 -
Specifications
Degrees Celsius
R = 7.465k
120
R = 4057
25/120
R =
t
1 1
7.465 exp
4057
393
Degrees Celsius
R = 15k
0
R = 3460
0/80
1 1
R = 15 exp
3460
t
273
0°C[32°F] :15k
10°C[50°F] :9.7k
20°C[68°F] :6.4k
25°C[77°F] :5.3k
30°C[86°F] :4.3k
40°C[104°F] :3.1k
Degrees Celsius
R = 17k
50
R = 4016
25/120
1 1
R = 17 exp
4016
t
323
0°C[32°F] :161k
10°C[50°F] :97k
20°C[68°F] :60k
25°C[77°F] :48k
30°C[86°F] :39k
40°C[104°F] :25k
Check method
Resistance check
Resistance check
GB