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(1)
(2)
(3)
(4) Control during normal operation
(A) Cooling operation
(B) Mixed cooling/heating operation
The main purpose of this valve is to detect the flow of refrigerant (refrigerant volume) on the indoor-unit side when
the outdoor unit heat exchanger is functioning as an evaporator. When the valve determines that there are signs of
excess refrigerant, refrigerant is recovered at the receiver tank.
This valve is ON during heating operation and when the outdoor unit heat exchanger is functioning as an evapora-
tor during mixed heating/cooling operation. It also turns ON in order to recover refrigerant at the outdoor unit after
heating operation is stopped.
(1)
(2)
(3)
(A) Heating operation
(4) This valve turns OFF when an abnormal drop in discharge gas temperature is detected.
(5) This valve turns OFF when a drop in the detected receiver tank temperature contin-
ues for a set length of time, and when liquid back-flow is judged to be occurring.
Hp
Lp
6-1. Refrigerant Control Valve [RCV]
The main purpose of this valve is to detect the flow of refrigerant (refrigerant volume) on the indoor-unit side when
the outdoor unit heat exchanger is functioning as a condenser. When the valve determines that there are signs of
a low refrigerant level, refrigerant is supplied from the receiver tank to the system.
The OFF conditions take priority over the ON conditions for this valve.
This valve is OFF when the outdoor unit is stopped.
This valve is ON when special control is in progress.
This valve turns ON when symptoms of insufficient refrigerant gas occur at an
indoor unit.
This valve turns ON when the outdoor air temperature is 59°F or below. (Under
these conditions the high pressure is low and refrigerant flow becomes poor.)
This valve turns OFF when symptoms of refrigerant overcharge are detected at
the outdoor unit.
The RCV turns ON at stopped outdoor units when the heat exchanger at anoth-
er outdoor unit is functioning as a condenser.
6-2. Refrigerant Balance Valve [RBV] – Gas Purge Valve
* This valve is never turned ON at the same time with the RCV.
This valve turns ON once after the outdoor unit starts.
This valve turns ON for 30 – 50 seconds after the outdoor unit stops, and then turns OFF.
The OFF conditions take priority over the ON conditions for this valve.
This valve is ON during heating operation and when it turns ON for the purpose
of recovering refrigerant in the outdoor unit at the end of the heating operation.
After the valve turns from ON to OFF, it will not turn ON again for 15 minutes.
This valve turns ON when poor refrigerant flow at an indoor unit is detected,
and when symptoms of overcharge are detected, if the heat exchanger at the
outdoor unit is functioning as an evaporator.
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W-2WAY ECO-i SYSTEM
Control Functions
6. Operation of Solenoid Valves