Toshiba RAS-18G2ACVP-T, Service Manual, Page: 40 / 122

Item Operation flow and applicable data, etc. Description
1 2 . Pulse
Modulating
valve (P.M.V.)
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 Modulation.
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)
* 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
Starting up
Initialize
Move to
initial position
PMV open degree control
SH control
Td
, high pressure
release control
Turn OFF by
remote controller
Compressor Stop by
"Room Temperature
Compressor ON
Defrosting
operation
Control"
Move to "Stop
Position" (Setup
from factory)
Move to "Defrost
Position" (Setup
from factory)
control
4 ) 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.
FILE NO. SVM-15058
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