Mitsubishi Electric PURY-P200 Service Handbook page 176

Note1 BC controller: Phenomena when LEV is connected wrongly (reverse connection of LEV1 and LEV3) to the
board.
Cooling-only
Non-cooling
SH12 small, SC11 small
SH16 small, branch pipe
SC small
BC controller sound
Note2 Check method of LEV fully open of fully closed status
1
Check LEV opening (pulse) with the self-diagnosis monitor (Outdoor control board SW1).
Fully open : 200pulse
Fully closed : 110pulse (In the case of heating-only mode, however, the pulse may become 110 or more.)
2 When LEV is fully open, measure the front and the rear temperature of the piping, and check that there
is no temperature difference.
3
When LEV is fully closed, check that there is no refrigerant flowing sound.
Note3 Refer to the chart below to judge LEV differential control and the opening with superheat control.
(BC controller LEV basic operation characteristic)
Site Malfunction mode
Inclined to close
LEV1
Inclined to open
G·GA
Inclined to close
type
LEV3
Inclined to open
Inclined to close
GB
LEV3a
type
Inclined to open
Phenomena
Cooling-main
Non-cooling, non-heating
SH12 small, SC11 small
SH16 large, but branch pipe
SC small
BC controller sound PHM
large
Operation mode
High pressure (P1) – Intermediate pressure
(P3) is large.
Heating-only
Heating-main
Cooling-main
High pressure (P1) – Intermediate pressure
(P3) is small.
Cooling-only
SH12 is large.
Cooling-main
Heating-only
High pressure (P1) – Intermediate pressure
Heating-main
(P3) is small.
Cooling-only
SC16 and SH12 are small.
Cooling-main
High pressure (P1) – Intermediate pressure
Heating-only
(P3) is large.
Heating-main
Cooling-only
SH22 is large.
Cooling-main
Cooling-only
SH22 is small.
Cooling-main
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Heating-only
Indoor heating SC small
PHM large
Content
Heating-main
Non-cooling
Indoor heating SC small
PHM large
Safety margin judgment standard
0.3~0.4MPa
SH12 < 20
0.3~0.4MPa
SC16 > 3
SH12 > 3
0.3~0.4MPa
SH22 < 20
SH22 > 3