Mitsubishi Electric HP120TNU-A Service Handbook page 279

[8-9 Troubleshooting Problems with Major Components on BC Controller ]
4) Refer to the chart below to judge LEV opening controlled by the values of the differential pressure and of the superheat.
(BC controller LEV basic operation characteristic)
LEV1
LEV3
J, JA, KA
type
LEV4
(JA and KA
types only)
KB type LEV3
38
- chapter 8
Malfunction Operation
Part
mode mode
Inclined to
close
Heating only
Heating-main
Cooling-main
Inclined to
open
Cooling-only
Cooling-main
Inclined to
close
Heating only
Heating-main
Cooling-only
Cooling-main
Inclined to
open
Heating only
Heating-main
Inclined to Heating-only
close Heating-main
Cooling-only
Inclined to Cooling-main
open Heating-only
Heating-main
Inclined to Cooling-only
close Cooling-main
Inclined to Cooling-only
open Cooling-main
Standards of judgment on
Content
Difference between high
pressure (P1) and interme-
diate pressure (P3) is large.
Difference between high
pressure (P1) and interme-
diate pressure (P3) is
small.
SH12 is large.
Difference between high
pressure (P1) and interme-
diate pressure (P3) is
small.
SC16 and SH12 are small.
Difference between high
pressure (P1) and interme-
diate pressure (P3) is large.
Difference between high
pressure (P1) and interme-
diate pressure (P3) is
small.
SC16 is small.
Difference between high
pressure (P1) and interme-
diate pressure (P3) is large.
SH12 is large.
SH12 is small.
unit stable operation
0.3 to 0.4MPa
[44 to 58psi]
SH12 < 20°C [36°F]
0.3 to 0.4MPa
[44 to 58psi]
SC16 > 3°C [5.4°F]
SH12 > 3°C [5.4°F]
0.3 to 0.4MPa
[44 to 58psi]
0.3 to 0.4MPa
[44 to 58 psi]
SC16 > 3°C [5.4°F]
0.3 to 0.4MPa
[44 to 58 psi]
SH12 < 20°C [36°F]
SH12 > 3°C [5.4°F]
HWE18220_GB