Outline of Control (Outdoor Unit) < Symbols using in this manual > Si33-105
70 Function R407C PLUS Series Heat Recovery System
3.4.4 BS Unit Basic Operation
Contents Instructs ON/OFF operation of BS unit solenoid valve from outdoor unit depending on the
operating state of indoor unit. However, regarding non-ordinary operation of startup control,
defrosting, oil return, and equalizing control, BS unit solenoid valve is switched under the
individual control. This section describes only the basic operation by indoor unit operation
mode.
1. During compressor operation
"
1. The solenoid valve is turned ON only when in simultaneous cooling/heating mode
"2. Remote controller setting judgement is not conducted when operation button is in OFF.
(Returns to operation of stopping unit in the previous mode)
2. During compressor stop
Regardless of the indoor unit temperature control and operating state, turns off all solenoid
valves.
Indoor unit
temperature
control mode
Indoor unit
operating
condition
Suction solenoid
valve
(20RL)
Discharge
solenoid valve
(20RH)
Bypass solenoid
valve
(20RT)
Cooling
Thermostat ON ON
OFF OFFThermostat OFF
OFF
Stop
Heating
Thermostat ON
OFF ON
"1
Thermostat OFF
OFF
Stop
Fan OFF OFF OFF
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