Discharge Temperature Control; Pulse Motor Valve (P .M.v.) Control - Toshiba RAS-M10GKCVP-E Service Manual

Item
11. Discharge
temperature
control
Td value
Judges as an error and stops the compressor.
117°C
Reduce the compressor speed.
112°C
Reduce slowly compressor speed.
108°C
Keeps the compressor speed.
105°C
If the operation is performed with lower speed than one
commanded by the serial signal, speed is slowly raised
up to the commanded speed.
98°C
Operates with speed commanded by the serial signal.
12. Pulse motor This function controls throttle amount of the
valve (P.M.V.) 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 motor.
Move to initial position
SH control
P.M.V. open degree control
Stop by remote controller
Power OFF
* SH (Super Heat amount) =
Ts (Temperature of suction pipe of the compressor) –
Tc (Heat exchanger temperature of indoor unit)
* PMV: Pulse Motor Valve
Operation flow and applicable data, etc.
Control operation
Starting up
Initialize
Compressor ON
Discharge temp. control
Room temp. sensor
(Ta sensor) 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 discharge temperature.
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) 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.
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Description