Pulse Modulating Valve (P .M.v.) Control - Toshiba RAS-18J2KVSG-E Service Manual

Item
This function controls throttle amount of the
13. Pulse
Modulating refrigerant in the refrigerating cycle.
valve (P.M.V.)
According to operating status of the air conditioner,
control
this function also controls the open degree of valve
with an expansion valve with pulse Modulation.
Starting up
Initialize
Move to
initial position
SH control
PMV open degree control
Stop by
remote controller
Power OFF
* SH (Super Heat amount) =
Ts (Temperature of suction pipe of the compressor) –
Tc or Te (Heat exchanger temperature at evaporation side)
* PMV: Pulse Modulating Valve
Operation flow and applicable data, etc.
Compressor ON
Td
release control
Room temp. sensor
(Ta sensor) control
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 exces-
sively up, adjust the open degree of valve
so that it is in the range of set tempera-
ture. (Discharge temp. control)
4) When defrost operation is performed, the
open degree of valve is adjusted accord-
ing to each setup conditions during
preparation for defrost and during defrost
operation (4-way valve is inversed.).
5) When operation is OFF by the remote
controller or when compressor is OFF by
room temperature control, the open
degree of valve is adjusted to the stop
position.
Defrost
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Description