Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 832 / 1106

FDC-HKX
830
FDCJ type · 2.06(21) 2.50(25.5)
FDCP type · 2.26(23) 2.79(28.5)
To target frequency
5 Hz/min.
5 Hz/2-min.
[Hz]
Hour [Hz]
(d) Under-dome temperature control
Fluid bypass solenoid valve (SV1) and indoor expansion valve are controlled based on the temperature of under-dome thermistor
(Tho-C) assembled on the compressor (CM1).
(e) High pressure control
Monitors the high pressure during heating operation so as to turn the outdoor fan OFF and control the compressor capacity.
Note (1) If operation is stopped within 20 minutes, second and later starts are subject to this control.
SV1 open
SV1 close
Under-dome
temperature (˚C)
Indoor
expansion valve
Addition of 5 Hz portion
Retention
Under-dome
temperature (˚C)
Outdoor fan ON
High pressure switch (63H
2
) MPa (kgf/cm
2
)
Outdoor fan OFF
High pressure switch (63H
2
) MPa (kgf/cm
2
)
Reset
Retention
Addition of 5 Hz portion
Discharge pipe temperature ( Tho-D1~D2 )
Note (1) ( ) indicates Tho-D2.
SV1, SV2 close
Discharge pipe thermistor (Tho-D1, D2)
SV1, SV2 open
(f) Discharge pipe temperature control
If the discharge pipe temperature (Tho-D1, D2 detection) exceeds the setting value, the temperature rise is suppressed by controlling the
liquid bypass solenoid valve, indoor expansion valve and compressor capacity and, if the pressure rises further, the compressor is stopped.
(i) Liquid bypass solenoid valve control
FDCJ type · 2.06(21) 2.50(25.5)
FDCP type · 2.26(23) 2.79(28.5)
Lowers the compressor
capacity at every 30-second.
108
°
C 115
°
C 80 (100)
°
C 115
°
C