Pulse Madulating Valve (Pmv) Control - Toshiba RAS-24N3KV2-A Service Manual

Item
15. Pulse modulating This function controls throttle amount of the
valve (PMV) refrigerant in the refrigerating cycle.
control
According to operating status of the air
conditioner, 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
Compressor Stop by
Turn OFF by
"Room Temperature
remote controller
Move to "Stop
Position" (Setup
from factory)
∗ 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
Control"
Move to "Defrost
Position" (Setup
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 or 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.
Defrosting
operation
from factory)
– 40 –
FILE NO. SVM-13004
Description