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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. (Dis-
charge temp. control)
* During control of No. of revolution
of the compressor, the open
degree of valve is adjusted before
release operation.
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 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.
6) If No. of revolution of the compres-
sor continuously varied during the
operation, correct the open degree
according to the varied No. of
revolution of the compressor.
7) If the refrigerant got dry from Tc
sensor (Indoor heat exchanger
temperature) position in cooling
operation, open forcibly the open
degree of valve based upon the
conditions.
8) An error detected on SH controlling
status due to PMV error, tempera-
ture sensor error, etc. is judged as
PMV error. In this case, execute an
emergent operation. (Operation
restricting the upper/lower limits of
No. of revolution of the compressor,
setting PMV as the fixed open
degree) (or stop in emergency)
* SH (Super Heat amount) =
Ts (Temperature of suction hose of the compressor) –
Tc or Te (Heat exchanger temperature at evaporation side)
* PMV: Pulse Motor Valve
A remote controller operates only one indoor unit.
When two indoor units are installed in a room or in two
adjacent rooms, this function prevents that two indoor units
receive concurrently a signal from the remote controller as
only one unit is to be operated.
15. Select
switch on
remote
controller
The indoor unit of which SELECT
switch on the remote controller is set
to B receives the signal sent from the
remote controller set to B.
(At shipment from the factory, SELECT
switch on the remote controller is set
to A. There is no display of A setting.)
Interrupt control
• Open degree
correction for
Hz variation of
the compressor
• Prevention for
intermediate
overheat
Judgment of
over-throttle
• Judgment of
PMV error
Both indoor units
start operation.
Unnecessary set
[Remote controller select]
Push the operation button
on the remote controller.
YES
NO
Set [Remote controller
SELECT] switches of one of
two indoor units and the
remote controller to [B].
(For details, refer to
“Installation Manual”.)
Activation
Defrost
Initialize
Move to initial
open degree
PMV open degree control
Pulse select output for each control time
SH control
Td
release control
Stop by
remote controller
Power OFF
Room temp. sensor
(Ta sensor) control
Compressor ON
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