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[
IX
Troubleshooting ]
Note1 BC controller: Phenomena when LEV is connected wrongly (reverse connection of LEV1 and LEV3) to the board.
Note2 Check method of fully open state or fully closed state of LEV
1) Check LEV opening (pulse) on the self-diagnosis LED (Heat source unit control board SW1).
Full open: 2000 pulses
Fully closed: 110 pulses (In the case of heating-only mode, however, the pulse may become 110 or more.)
2) When LEV is fully open, measure the temperature at the upstream and downstream pipes of LEV, and make
sure 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 opening controlled by the values of the differential pressure and of the super-
heat. (BC controller LEV basic operation characteristic)
Phenomena
Cooling-only
Cooling-main
Heating only
Heating main
Non-cooling
SH12 small, SC11 small
SH16 small, branch pipe
SC small
BC controller sound
Non-cooling and non-heat-
ing
SH12 small, SC11 small
SH16 large, but branch
pipe SC small
BC controller sound PHM
large
Indoor heating SC small
PHM large
Non-cooling
Indoor heating SC small
PHM large
Part
Malfunction
mode
Operation
mode
Content
Standards of judgment on
unit stable operation
NU-
G,GA
(Main)
LEV1
Inclined to
close
Heating only
Heating-
main
Cooling-
main
Difference between high
pressure (P1) and interme-
diate pressure (P3) is large.
0.3 - 0.4MPa
[44 - 58psi]
Inclined to
open
Difference between high
pressure (P1) and interme-
diate pressure (P3) is
small.
LEV3
Inclined to
close
Cooling-only
Cooling-
main
SH12 is large.
SH12 < 20K [36°F]
Heating only
Heating-
main
Difference between high
pressure (P1) and interme-
diate pressure (P3) is
small.
0.3 - 0.4MPa
[44 - 58psi]
Inclined to
open
Cooling-only
Cooling-
main
SC16 and SH12 are small.
SC16 > 3K [5°F]
SH12 > 3K [5°F]
Heating only
Heating-
main
Difference between high
pressure (P1) and interme-
diate pressure (P3) is large.
0.3 - 0.4MPa
[44 - 58psi]
NU-GB
(Sub)
LEV3a
Inclined to
close
Cooling-only
Cooling-
main
SH22 is large.
SH22 < 20K [36°F]
Inclined to
open
Cooling-only
Cooling-
main
SH22 is small.
SH22 > 3K [5°F]
Содержание City Multi CMB-P1016NU-G
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Страница 117: ... 108 VI Refrigerant Circuit 3 CMB P104 and P108NU GB sub TH25 TH22 LEV3a CP Solenoid valves Block Check valves Block ...
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Страница 312: ... 303 X LED Monitor Display on the Heat Source Unit Board 1 How to Read the LED on the Service Monitor 305 ...
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