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Mitsubishi Electric PURY-80TMU Service Handbook page 73

City multi
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Note 1 :
•
Symptoms of incorrect i.e, reverse connection of PS
Cooling-only
Normal
Note 2 :
•
Check using LED monitor display switch (outdoor MAIN board SW1)
High pressure of
outdoor
Low pressure of
outdoor
BC controller pressure
(liquid measurement)
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
Cooling-principal
Insufficient
SC11 large
cooling.
SC16 small
PHM < 0
Measured Data
Signal
HPS
LPS
PS1
PS3
(intermediate)
(Pressure sensor output voltage)
and PS
to BC controller board
1
3
Symptom
Heating-only
Warm indoor SC
SC11 small
small. When SV
SC16 small
opens
some
PHM < 0
noise produced.
SW1 Setting
1
2 3 4 5 6 7 8 9 10
See converter.
ON
See converter.
1
2 3 4 5 6 7 8 9 10
ON
Convert saturation
1
2 3 4 5 6 7 8 9 10
ON
temperature to
desired pressure
1
2 3 4 5 6 7 8 9 10
using converter.
ON
–72–
Heating-principal
Insufficient heating
SC11 large
Warm indoor SC small
SC16 small
When SV opens some
PHM < 0
noise produced
Remarks
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