Mitsubishi Electric MXZ-24UV - E1 Service Manual page 22

10-6.Refrigerant recovery control on heating
<Control status>
The control performs when the following status are satisfied everything;
• When there is 1 unit or more not operating indoor unit on heat operation. (Excluding thermo OFF)
• When discharge temperature becomes 107; or more.
• When it passed 60 minutes or more since the operation has started or the last refrigerant recovery has controlled.
<Control details>
LEV opening, which adjusts to not operating indoor unit, is considered to be 80 pulse.
<Control finish status>
The control finishes either as follows. However, the LEV opening is considered to be 59 pulse.
• When it passed 60 seconds since the control has started.
• When the discharge temperature is 90; or less.
10-7.Outdoor fan control
Fan speed is switched according to a number of operating indoor unit and the compressor frequency.
Fan speed
Down
Hi
Low
Min. Compressor frequency
<Relation between compressor frequency and fan speed.>
Mode
Fan speed
COOL
HEAT
Note
• When operation, fan speed of Hi/ Low mode changes to VHi/ Hi mode by promoting those fan speeds respectively by
1 step after defrosting is operated. This control is cleared, when the compressor off.
• When overheat protection of P.C. board temperature or fin temperature operates, the outdoor fan speed is fixed to VHi
mode regardless of compressor frequency. Also, when the overheat protection is cleared, the fan speed is
back to normal
• When the indoor coil thermistor is 57; or more on HEAT operation, fan speed is fixed to Low notch .
Or, the indoor coil thermistor is 45; or less on HEAT operation, fan speed is back to normal.
10-8.Relation between main sensor and actuator
Relation between main sensor and actuator.
Sensor
Discharge temperature
thermistor
Indoor pipe temperature
thermistor
Defrost thermistor
Evaporation temperature
thermistor
Gas pipe temperature
thermistor
High pressure
switch
Fin temperature
thermistor
Capacity code
Up
Max.
Indoor unit operation
Single Double
Up 55 Hz 50Hz
Down 45 Hz 45 Hz
Up 60 Hz 45 Hz
Down 50 Hz 40 Hz
Purpose
Compressor
Protection
Defrosting
Protection
Defrosting
Control
Control
Protection
Protection
Control
Triple
50 Hz
45 Hz
40 Hz
35 Hz
Actuator
Outdoor Reversing
LEV
fan motor valve
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