Item
Operation flow and applicable data, etc.
Description
Control operation
55°C 49°C
Cooling
(TE)
Heating
(TC)
63°C
63°C
61°C
59°C
62°C
57°C
55°C
53°C
1
2
. High pressure control
1. Purpose
This function detects error on the
refrigerating cycle or error on the com-
pressor, and performs protective control.
2. Operation
Control of the compressor speed The
speed control is performed as described in
the left table based upon the heat
exchanger temperature (TE, TC).
1
3
. 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
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.
Starting up
Defrost
Initialize
Move to
initial position
PMV open degree control
SH control
Td
release control
Stop by
remote controller
Power OFF
Room temp. sensor
(Ta sensor) control
Compressor ON
FILE NO. SVM-17001
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