–96–
LEV No. 1 3 Cooling-only Cooling-main Heating-only Heating-main
1) 1 3 Normal ←← ←
2) 3 1 Insufficient cooling
SH12 small
SC11 small
SC16 small
Branch piping SC small
Insufficient cooling, insuf-
ficient heating
SH12 small, SC11 small
SC16 large,
Branch piping SC small
PHM large
Heating indoor SC small
PHM large
Insufficient cooling
Heating indoor SC small
PHM large
Small
Large
Small
Large
High pressure (PS1) - medium pressure (PS3) is large.
High pressure (PS1) - medium pressure (PS3) is small.
SH12 is large.
High pressure (PS1) - mid pressure (PS3) is small.
SC16 and SH12 are small.
High pressure (PS1) - mid pressure (PS3) is large.
Heating-only
Heating-main
Cooling-main
Cooling-only
Cooling-main
Heating-only
Heating-main
Cooling-only
Cooling-main
Heating-only
Heating-main
0.20~0.34MPa
SH12<25
0.20~0.34MPa
SC16>6
SH12>5
0.20~0.34MPa
LEV1
pulse
LEV3
pulse
Region Failure mode
Operating mode
Description Normal range
LEV3a
pulse
*
Small
FA
FB
Cooling-only
Cooling-main
Heating-main
Cooling-only
Cooling-main
Heating-main
SH22 is large.
SH22 is small.
SH22<25
SH12>5
* LEV3a operates when indoor unit connected to FB type is in cooling mode.
1 LEV
Note 1 :
• Symptoms of incorrect connection to BC controller LEV board
Improper installation is the same for 1 and 2, so it is omitted here.
Note 2: Method of checking LEV’s fully-open and fully-closed status
1 Check LEV’s full opening (pulse), using the LED monitor display (outdoor controller board SW1).
Fully opened: 2000 pulsed
Fully closed: 60 pulses (LEV 1 may be greater than 60 during full-heating operation.)
2 With LEV fully open, check for pressure difference by measuring the temperature of the piping on both sides.
3 With LEV fully 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
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