Symptoms Of Incorrect Connection To Bc Controller Lev Board - Mitsubishi Electric PUHY-200YMF-C Service Handbook

1 LEV
Note 1 :
•

Symptoms of incorrect connection to BC controller LEV board

LEV No. 1 3
1) 1 3
2) 3 1
Improper installation is the same for 1 and 2, so it is omitted here.
Note 2 : Method for checking LEV full open, full closed condition
1 Check LEV full opening (pulse) using the LED monitor display (outdoor controller board SW1).
Full opened: 2000 pulses
Full closed: 60 pulses (LEV 1 may be greater than 60 during full heating operation.)
2 With LEV full opened, check for pressure differential by measuring temperature of piping on both sides.
3 With LEV full closed, check for refrigerant noise.
Note 3 : Use the following table to determine opening due to LEV differential pressure control and superheat
control.
• BC controller LEV basic operation characteristics
Region Failure mode Operating mode
Small
LEV1
pulse
Large
Small
LEV3
pulse
Large
Cooling-only
Normal
Insufficient cooling Insufficient cooling, insuf-
SH12 small, ficient heating
SC11 small SH12 small, SC11 small
SC16 small SC16 large,
Branch piping SC small Branch piping SC small
Heating-only High pressure (PS1) - medium pressure (PS3) is large.
Heating-main
High pressure (PS1) - medium pressure (PS3) is small.
Cooling-main
Cooling-only
SH12 is large.
Cooling-main
Heating-only
High pressure (PS1) - mid pressure (PS3) is small.
Heating-main
Cooling-only
SC16 and SH12 are small.
Cooling-main
Heating-only
High pressure (PS1) - mid pressure (PS3) is large.
Heating-main
Cooling-main Heating-only
←
Heating indoor SC small
PHM large
PHM large
Description
–109–
Heating-main
← ←
Insufficient cooling
Heating indoor SC small
PHM large
Normal range
2.0 ~ 3.5 kg/cm 2 G
(0.20~0.34MPa)
SH12<25
2.0 ~ 3.5 kg/cm 2 G
(0.20~0.34MPa)
SC16>6
SH12>5
2
2.0 ~ 3.5 kg/cm G
(0.20~0.34MPa)