Mitsubishi Electric PUHY-HP72 Service Handbook page 64

[3-3 Functions of the Major Components of Outdoor Unit ]
Part Symbols
Notes
name (functions)
Thermis- TH4
tor (Discharge
temperature)
TH2
(Pipe
temperature)
TH3
(Pipe
temperature)
TH7
(Outdoor
temperature)
TH5
(Pipe
temperature)
TH6
(Pipe
temperature)
TH15
(Compres-
sor shell bot-
tom
temperature)
THHS IPM is
Inverter built in.
heat sink Do not at-
temperature tempt to
measure
resis-
tance.
HWE18240_GB
Usage
1) Detects discharge air temper-
ature
2) Provides high-pressure pro-
tection
0°C[32°F] :698 k
10°C[50°F] :413 k
20°C[68°F] :250 k
30°C[86°F] :160 k
40°C[104°F] :104 k
50°C[122°F] : 70 k
60°C[140°F] : 48 k
70°C[158°F] : 34 k
80°C[176°F] : 24 k
90°C[194°F] :17.5 k
100°C[212°F] :13.0 k
110°C[230°F] : 9.8 k
LEV 1 is controlled based on the
TH2, TH3, and TH6 values.
1) Controls frequency
2) LEV1 is controlled based on
the subcool at heat exchange
outlet that is obtained based
on the HPS data and TH3 val-
ue.
1) Detects outdoor air tempera-
ture
2) Controls fan operation
LEV2 are controlled based on the
63LS and TH5 values.
Controls LEV1 based on TH2,
TH3, and TH6 data.
Detects compressor shell bottom
temperature
Inverter overheating protection
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] :15 k
10°C[50°F] :9.7 k
20°C[68°F] :6.4 k
25°C[77°F] :5.3 k
30°C[86°F] :4.3 k
40°C[104°F] :3.1 k
Degrees Celsius
R = 17k
50
R = 4016
25/120
1 1
R = 17 exp
4016
t
323
0°C[32°F] :161 k
10°C[50°F] :97 k
20°C[68°F] :60 k
25°C[77°F] :48 k
30°C[86°F] :39 k
40°C[104°F] :25 k
Check method
Resistance check
Resistance check
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5
chapter 3 -