Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 62

[3-4 Functions of the Major Components of Outdoor Unit ]
Part Symbols
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
Inverter
heat sink
temperature
THL DCL
temperature
BS_03_C
Notes Usage
1) Detects discharge air temper-
ature
2) Provides high-pressure pro-
tection
0°C[32°F] :698 kΩ
10°C[50°F] :413 kΩ
20°C[68°F] :250 kΩ
30°C[86°F] :160 kΩ
40°C[104°F] :104 kΩ
50°C[122°F] : 70 kΩ
60°C[140°F] : 48 kΩ
70°C[158°F] : 34 kΩ
80°C[176°F] : 24 kΩ
90°C[194°F] :17.5 kΩ
100°C[212°F] :13.0 kΩ
110°C[230°F] : 9.8 kΩ
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
DCL overheat 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
exp
R = 15
3460
t
273
0°C[32°F] :15 kΩ
10°C[50°F] :9.7 kΩ
20°C[68°F] :6.4 kΩ
25°C[77°F] :5.3 kΩ
30°C[86°F] :4.3 kΩ
40°C[104°F] :3.1 kΩ
Degrees Celsius
R = 17k
50
R = 4016
25/120
1 1
R = 17 exp
4016
t
323
0°C[32°F] :161 kΩ
10°C[50°F] :97 kΩ
20°C[68°F] :60 kΩ
25°C[77°F] :48 kΩ
30°C[86°F] :39 kΩ
40°C[104°F] :25 kΩ
Degrees Celsius
R = 3.3k
100
B = 3970
0/100
1 1
R = 3.3 exp
3970
t
373
0°C[32°F] :162.2 kΩ
10°C[50°F] :98.3 kΩ
25°C[77°F] :49.1 kΩ
50°C[122°F] :17.6 kΩ
100°C[212°F] :3.3 kΩ
Check method
Resistance check
Resistance check
13
chapter 3 -