Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 80

[ VI Refrigerant Circuit ]
Symbols
Part name
(functions)
Thermistor TH4
(Discharge)
TH2
TH3
(Pipe
temperature)
TH7
(Outdoor
temperature)
TH5
TH6
THHS
Inverter
heat sink
temperature
THBOX
Control box
internal tem-
perature de-
tection
HWE0716A
Notes Usage
1) Detects discharge air tempera-
ture
2) Provides high-pressure protec-
tion
0°C[32°F] :698kohm
10°C[50°F] :413kohm
20°C[68°F] :250kohm
30°C[86°F] :160kohm
40°C[104°F] :104kohm
50°C[122°F] : 70kohm
60°C[140°F] : 48kohm
70°C[158°F] : 34kohm
80°C[176°F] : 24kohm
90°C[194°F] :17.5kohm
100°C[212°F] :13.0kohm
110°C[230°F] : 9.8kohm
LEV 1 is controlled based on the
TH2, TH3, and TH6 values.
1) Controls frequency
2) Controls defrosting during
heating operation
3) Detects subcool at the heat ex-
changer outlet and controls
LEV1 based on HPS data and
TH3 data
1) Detects outdoor air tempera-
ture
2) Controls fan operation
LEV2a and LEV2b are controlled
based on the 63LS and TH5 values.
Controls LEV1 based on TH2, TH3,
and TH6 data.
Controls inverter cooling fan based
on THHS temperature
- 71 -
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] :15kohm
10°C[50°F] :9.7kohm
20°C[68°F] :6.4kohm
25°C[77°F] :5.3kohm
30°C[86°F] :4.3kohm
40°C[104°F] :3.1kohm
Degrees Celsius
R = 17k
50
R = 4016
25/120
1 1
exp
R = 17
4016
t
323
0°C[32°F] :161kohm
10°C[50°F] :97kohm
20°C[68°F] :60kohm
25°C[77°F] :48kohm
30°C[86°F] :39kohm
40°C[104°F] :25kohm
Check method
Resistance
check
Resistance
check
GB