Mitsubishi Electric CITY MULTI CMB-P1010V-E, Руководство по обслуживанию, Страница: 98 / 154

–95–
Note 1 :
• Symptoms of incorrect connection of BC controller pressure sensor to the board
Note 2 :
• Check using LED monitor display switch (heat source unit MAIN board SW1)
Note 3 :
• Check CNP1 (liquid measurement) and CMP3 (intermediate) connectors on BC controller board for disconnection or
looseness.
Note 4 :
• With the sensor of the applicable connector removed from the board, use the LED monitor display switch (Note 1) to
check the pressure value.
Pressure Sensor Replacement Precaution
Symptom
Cooling-only Cooling-principal Heating-only Heating-principal
Normal
Insufficient
cooling.
SC11 large
SC16 small
PHM < 0
SC11 large
SC16 small
PHM < 0
Warm indoor SC
small. Warm in-
door thermo ON
especially noise.
SC11 small
SC16 small
PHM < 0
Insufficient heating
Warm indoor SC small
Warm indoor thermo
ON especially noise
Measured Data
High pressure
Low pressure
BC controller pressure
(liquid measurement)
(intermediate)
Signal
HPS
LPS
PS1
PS3
SW1 Setting
1
ON
2 3 4 5 6 7 8 9 10
1
ON
2 3 4 5 6 7 8 9 10
1
ON
2 3 4 5 6 7 8 9 10
1
ON
2 3 4 5 6 7 8 9 10
(Pressure sensor output voltage)