Mitsubishi Electric PUHY-200YMF-B Service Handbook page 121

1 LEV
Note 1 :
• Symptoms of incorrect connection to BC controller LEV board
LEV No. 1 2 3 4
1) 1 2 3 4
2) 1 2 4 3
3) 1 3 2 4
4) 1 3 4 2
5) 1 4 2 3
6) 1 4 3 2
7) 2 3 1 4
8) 2 3 4 1
9) 2 4 1 3
10) 2 4 3 1
11) 3 4 1 2
12) 3 4 2 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, 2 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, 2
pulse
Large
Small
LEV3
pulse
Large
Small
LEV4
pulse
Large
* There are not LEV2 and LEV4 on CMB-P-V-E.
Cooling-only
Normal
Insufficient heating Insufficient cooling, insuf-
SH12 large ficient heating
SC11 small SH12 large, SC11 small
SC16 large, SC16 large,
Branch pipe SC small Branch piping SC small
Indoor SC large.
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
Heating-only
SH12 is large.
High pressure (PS1) - mid pressure (PS3) is small.
Heating-main
Cooling-only
SC16 is small.
Cooling-main
Heating-only
High pressure (PS1) - mid pressure (PS3) is large.
Heating-main
Cooling-principal Heating-only
←
Insufficient heating,
Comp. frequency low
Low press. low
PHM small
PHM small. Heating
Heating indoor SC small
PHM large
PHM large
↑
↑
↑
↑
↑
↑
↑
↑
↑
* There are not LEV2 and LEV4 on CMB-P-V-E.
Description
–119–
Heating-principal
← ←
Insufficient heating,
Comp. frequency low
Low press. low
PHM small
Insufficient cooling
Heating indoor SC small
PHM large
↑ ↑
↑ ↑
↑ ↑
↑ ↑
↑ ↑
↑ ↑
↑ ↑
↑ ↑
↑ ↑
Normal Range
2
2.0 ~ 3.5 kg/cm G
(0.20~0.34MPa)
SH12<25
2.0 ~ 3.5 kg/cm 2 G
(0.20~0.34MPa)
SC16>6
SH12>5 (V-D type)
SH12>5 (V-E type)
2
2.0 ~ 3.5 kg/cm G
(0.20~0.34MPa)
SH12<25
2.0 ~ 3.5 kg/cm 2 G
(0.20~0.34MPa)
SC16>6
2
2.0 ~ 3.5 kg/cm G
(0.20~0.34MPa)