– 50 –
Starting up
Defrost
Initialize
Move to
initial position
PMV open degree control
SH control
Discharge
temp. control
Stop by
remote controller
Power OFF
Room temp. sensor
(Ta sensor) control
Compressor ON
Item
14. Pulse motor valve
(P.M.V.) 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 and 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.
