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Starting up
Defrost
Initialize
Move to
initial position
PMV open degree control
SH control
Td
release control
Stop by
remote controller
Power OFF
Room temp. sensor
(Ta sensor) control
Compressor ON
Item
14. 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.
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 per-
formed, the open degree of valve is
adjusted according to each setup
conditions during preparation for
defrost and during defrost opera-
tion (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.
* SH (Super Heat amount, cooling operation) =
Tg (Temperature of gas pipe) – Tc (Heat exchanger
temperature of indoor unit)
* SH (Super Heat amount, heating operation) =
Ts (Temperature of suction pipe of the compressor) –
Te (Heat exchanger temperature of outdoor unit)
* PMV: Pulse Motor Valve