(5) Protective control
(a) Discharge pipe temperature control
If the discharge pipe temperature exceeds 105°C, compressor speed is reduced to suppress the rising of discharge pipe
temperature.
(i) If the discharge pipe temperature sensor (Tho-D1) detects 115°C or higher for 2 seconds continuously, it makes
compressor stopped. And if this anomaly occurs 5 times within 60 minute, it makes the unit anomalous stop. (E36-1)
(ii) If the discharge superheat sensor (Td-DST) detects 5degC or lower for 10 minutes continuously, it makes compressor
And if this anomaly occurs 3 times within 60 minutes, it makes the unit anomalous stop. (E44)
(b) High pressure control
(i) Compressor rotation speed protection control
①
If high pressure sensor (PSH) detects 3.70MPa or higher, it makes compressor rotaion speed decreasing.
②
If high pressure sensor (PSH) still detects 3.70MPa or higher 5 seconds after
①
control, it makes compressor
rotation speed decreasing more.
③
If high pressure sensor (PSH) detects lower than 3.70MPa, this protective control is released.
(ii) High pressure protective control
If high pressure switch (63H1) is activated or if high pressure sensor (PSH) detects 4.14MPa or higher for 10
seconds continuously, it makes compressor stopped (High pressure anomaly).
And if this anomaly occurs 5 times within 60 minute, it makes the unit anomalous stop.(E40)
(c) Low pressure control
(i) Compressor rotation speed protection control
①
If low pressure sensor (PSL) detects 0.18MPa or lower for 10 seconds continuously, it makes compressor
rotaion speed decreasing.
②
If low pressure sensor (PSL) still detects 0.18MPa or lower 30 seconds after
①
control, it makes compressor
rotation speed decreasing more.
③
If low pressure sensor (PSL) detects higher than 0.236MPa, this protective control is released.
(ii) Low pressure protective control
If low pressure sensor (PSL) detects 0.134MPa or lower for 30 seconds continuously, or if it detects 0.003MPa or
lower for 5 seconds continuously, it makes compressor stopped (Low pressure anomaly).
And if this anomaly occurs 5 times within 60 minutes, it makes the unit anomalous stop.(E49)
(d) High pressure ratio protective control
①
If pressure ratio is 8.0 or higher, it makes compressor rotaion speed decreasing.
②
If pressure ratio is 8.0 or higher 60 seconds after
①
control, it makes compressor rotation speed decreasing more.
③
If pressure ratio is 7.9 or lower, this protective control is released.
(e) Over-current protection control (Current safe)
(i) Compressor capacity control
①
Compressor speed is controlled by detecting the inverter’s T-phase current or secondary current.
②
The control is changed at every ambient air temperature zone.
[Fig. 1]
Outdoor air temperature (°C)
Current safe value (A)
A
B
C
D
3935 43 50
• Current safe setting value
Power
source
Current safe value [A]
Inverter primary (T-phase) current Inverter secondary current
Cooling
Heating
Cooling
Heating
A B C D A B C D
1-phase 23 21 19 15 23 18
3-phase 13.5 13.5 11.5 11.5 13.5 13
③
Ending condition
This control ends when the inverter’s T-phase current or secondary current drops below the current safe setting
value minus 1 ampere for 3 minutes continuously or below the current safe setting value in the table shown
above for 6 minutes continuously.
(ii) Compressor upper limit frequency control
When it enters any zone other than the zone A (Fig. 1), the upper limit of compressor speed is changed.
Power
source
Compressor upper limit speed (rps)
Cooling
Heating
A B C D
1-phase 105 98 82 54
130
3-phase 106 98 92 54
However, the priority is given to the upper limit compressor speed by this control or the compressor speed under
normal condition, whichever the lower.
(f) Power transistor temperature (PT) protective control
If the power transistor temperature exceeds 85°C, the compressor speed is controlled.
Speed is reduced once each minute
Release
Retention
81 85
Power transistor temperature (ºC)
(6) Test run
(a) Starting conditions
(i) Turn ON the test run switch (SW5-1). The switch is invalid if it is turned ON before the power ON.
(ii) Pump down switch (SW5-3) must be turned OFF.
(b) Contents of control
(i) Turning ON the dip switch (SW5-2) conducts cooling operation and turning OFF (SW5-2) conducts heating
operation.
1) Cooling operation
Compressor operation frequency control is operated under the cooling low pressure control.
2) Heating operation
Compressor operation frequency control is operated under the heating high pressure control.
(ii) Test run start signal under corresponding operation mode is transmitted to all indoor units connected.
(c) Ending conditions
(i) When the test run switch (SW5-1) is turned OFF, it stops.
(ii) When it has stopped anomalously by the error control during test run, the error is displayed in the same way as
normal operation and the state of anomalous stop continues even if the test run switch (SW5-1) is turned OFF.
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