Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 832

FDC-HKX
[Hz]
Note (1) If operation is stopped within 20 minutes, second and later starts are subject to this control.
(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).
SV1 open
SV1 close
Under-dome
temperature (˚C)
(e) High pressure control
Monitors the high pressure during heating operation so as to turn the outdoor fan OFF and control the compressor capacity.
FDCJ type · 2.06(21)
FDCP type · 2.26(23)
High pressure switch (63H
(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
SV1, SV2 close
108°C
Discharge pipe thermistor (Tho-D1, D2)
830
5 Hz/min.
5 Hz/2-min.
Lowers the compressor
capacity at every 30-second.
2.50(25.5)
2.79(28.5)
2
) MPa (kgf/cm )
2
SV1, SV2 open
115°C
To target frequency
Hour [Hz]
Retention
Indoor
expansion valve
Under-dome
temperature (˚C)
Outdoor fan ON
FDCJ type · 2.06(21)
FDCP type · 2.26(23)
High pressure switch (63H
Retention
Reset
80 (100)°C
Discharge pipe temperature ( Tho-D1~D2 )
Note (1) ( ) indicates Tho-D2.
Addition of 5 Hz portion
Outdoor fan OFF
2.50(25.5)
2.79(28.5)
2
) MPa (kgf/cm )
2
Addition of 5 Hz portion
115°C