Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 136

Part Symbols
Notes
name (functions)
Ther- TH11 TH12 is
mistor TH12 available
(Discharge) only on
P168-
P234
models
TH5
(Pipe
temperature)
TH6
(Outdoor
temperature)
TH7
TH8
THHS Heat sink
Inverter
heat sink
temperature
Solenoid SV1
valve Discharge-
suction
bypass
SV3 P168-
Discharge- P234
suction models
bypass only
SV5b P126-
Heat P234
exchanger models
capacity only
control
Usage
1. Detects discharge air temper-
ature
2. Provides high-pressure pro-
tection
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
1. Controls frequency
2. Controls defrosting during
heating operation
3. Detects subcool at the heat
exchanger outlet and controls
LEV1 based on HPS data and
TH5 data
1. Detects outdoor air tempera-
ture
2. Controls fan operation
Controls LEV1 based on TH5,
TH7, and TH8 data.
Controls inverter cooling fan
based on THHS temperature
1. High/low pressure bypass at
start-up and stopping, and ca-
pacity control during low-load
operation
2. High-pressure-rise prevention
Provides compressor protection
while compressor No. 2 is
stopped
Controls outdoor unit heat ex-
changer capacity
- 127 -
[ VI Refrigerant Circuit ]
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
AC208/230V
Open while being powered/
closed while not being pow-
ered
AC208/230V
Closed while being powered/
open while not being powered
Check
method
Resis-
tance
check
Resis-
tance
check
Continuity
check with
a tester