PACD011001C2 Outline of Control
Function UM Combination “MA1R Series” Using R-407C 443
3.1.17 Heating Pump-Down Residual Operation
Conduct an operation during stop mode to discharge refrigerant from the low pressure side, since liquid
refrigerant remaining in the accumulator can be sucked into the compressor during startup and dilutes the
refrigerating machine oil in the compressor and lowers the lubricating performance.
[Residual operation starting condition]
DSHi : INV discharge pipe superheat degree
Th6-Te : Suction pipe temp. -Low pressure equivalent saturation temp.
[Description of movement]
∗
Receiver gas relief solenoid valve is open and liquid refrigerant is moved to liquid line for 60 seconds
after entering pump-down residual operation.
However, this relief solenoid valve closes at Th6-Te < 0.
[Ending condition]
3.1.18 Backup Operation
[Purpose]
The following backup operation is activated when the constant-speed compressor protection device
operates.
< For 2-compressor system >
„
When the STD compressor OC operates, the operation continues using only the inverter compressor
based on all remote control reset. (for 3 hours only)
< For 3-compressor system >
„
When the STD compressor OC operates, the operation continues using compressor except last started
STD compressor based on remote control reset. (for 3 hours only)
„
When OC operates again immediately after a backup operation (within 5 minutes after STD compressor
startup), STD1 and STD2 are switched and operation is retried.
„
If OC activates again, only the inverter compressor is used for the operation.
(In any case, the backup operation ends after 3 hours.)
„
The compressor in which OC is activated is prohibited to operate until power reset is conducted for a
restart.
&
Thermostat ON
→
OFF
OR
DSHi < 20°C
Th6 – Te < 10°C
Outdoor unit Indoor unit
Compressor Motorized valve Solenoid valve for hot gas Motorized valve
Movement 67Hz+OFF
Initial 2000 pls
→
PI control when SHS = 10°C
ON (equalization) 500 pls (all indoor unit)
&
DSHi > 90°C
Th6 – Te < 10°C
LP < 0.07MPa
Tc > 48.6°C
10 min elapse
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