Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 139

[ VI Refrigerant Circuit ]
Symbols
Part
(func-
name
tions)
Ther- TH11
mistor TH12
(Dis-
charge)
TH5
(Pipe
tempera-
ture)
TH6
(Out-
door
tempera-
ture)
TH7
(Pipe
tempera-
ture)
THHS
Inverter
heat sink
tempera-
ture
Notes Usage
TH12 is 1. Detects discharge air temper-
available ature
only on 2. Provides high-pressure pro-
P168-P234 tection
models
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
Controls defrosting during heat-
ing operation
1. Detects outdoor air tempera-
ture
2. Controls fan operation
Controls defrosting during heat-
ing operation
Heat sink Controls inverter cooling fan
based on THHS temperature
- 130 -
Specifications
R = 7.465k
120
R = 4057
25/120
R =
t
1 1
7.465 exp
4057
393
R = 15k
0
R = 3460
0/80
1 1
exp
R = 15
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
R = 17k
50
R = 4170
25/120
1 1
R = 17 exp
4170
t
323
0°C[32°F] : 181kohm
10°C[50°F] :105kohm
20°C[68°F] : 64kohm
25°C[77°F] : 50kohm
30°C[86°F] : 40kohm
40°C [104°F]: 26kohm
Check
method
Resis-
tance
check
Resis-
tance
check