Item
12. Pulse motor
valve (PMV)
control
Operation flow and applicable data, etc.
This function controls throttle amount of the
refrigerant in the refrigerating cycle.
According to operating status of the air
conditioner, this function also controls the open
degree of valve with an expansion valve with
pulse motor.
∗
SH (Super Heat amount) =
Ts (Temperature of suction pipe of the compressor) –
Tc or Te (Heat exchanger temperature at evaporation side)
∗
PMV: Pulse Motor Valve
Description
1) When starting the operation, move the valve
once until it fits to the stopper. (Initialize)
* In this time, “Click” sound may be heard.
2) Adjust the open degree of valve by super heat
amount. (SH control)
3) If the discharge temperature was excessively
up, adjust the open degree of valve so that it
is in the range of set temperature.
(Discharge temp. control)
4) When defrost operation is performed, the
open degree of valve is adjusted according to
each setup conditions during preparation for
defrost or during defrost operation
(4-way valve is inversed.).
5) To turn off the compressor while the air
conditioner stops by control of the thermostat
or by remote controller, adjust the open
degree of valve to the setup value before stop
of the compressor.
Starting up
Initialize
SH control
Td
release control
Stop by
remote controller
Room temp. sensor
(Ta sensor) control
Power OFF
Compressor ON
PMV open degree control
Move to
initial position
Defrost
FILE NO. SVM-12056
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38
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Summary of Contents for RAS-18N3AV2-E
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