SiMT041509E
Control Specification
Function and Control
42
3.11.1 Fully Closing with Power ON
The electronic expansion valve is initialized when turning on the power. The opening position is
set and the pressure is equalized.
3.11.2 Pressure Equalizing Control
When the compressor is stopped, the pressure equalizing control is activated. The electronic
expansion valve opens, and develops the pressure equalization.
3.11.3 Opening Limit Control
The maximum and minimum opening of the electronic expansion valve are limited.
The electronic expansion valve is fully closed when cooling operation stops, and is controled at
a fixed opening during defrosting.
3.11.4 Starting Operation Control
The electronic expansion valve opening is controlled when the operation starts, thus preventing
superheating or liquid compression.
3.11.5 Control when the Frequency Changes
When the target discharge pipe temperature control is active, if the target frequency changes to
a specified value in a certain time period, the target discharge pipe temperature control is
canceled and the target opening of the electronic expansion valve is changed according to the
frequency shift.
3.11.6 High Discharge Pipe Temperature Control
When the compressor is operating, if the discharge pipe temperature exceeds a certain value,
the electronic expansion valve opens and the refrigerant runs to the low pressure side. This
procedure lowers the discharge pipe temperature.
3.11.7 Target Discharge Pipe Temperature Control
The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger
temperature, and the electronic expansion valve opening is adjusted so that the actual
discharge pipe temperature becomes close to the target discharge pipe temperature (indirect
SH (superheating) control using the discharge pipe temperature).
The electronic expansion valve opening and the target discharge pipe temperature are adjusted
every 20 seconds. The opening degree of the electronic expansion valve is adjusted by the
followings.
Target discharge pipe temperature
Actual discharge pipe temperature
Previous discharge pipe temperature
Maximum opening (pulse)
480
Minimum opening (pulse)
52
SC
(Subcool)
SH
(Superheat)
The target discharge pipe
temperature is set as to become
the aim SH.
The inclination does not change
depending on the operating condition.
(R18921)
Summary of Contents for FTKM18PVMK
Page 16: ...SiMT041509E 1 List of Functions Part 1 List of Functions 1 Functions 2 ...
Page 18: ...SiMT041509E 3 Specifications Part 2 Specifications 1 Specifications 4 ...
Page 59: ...SiMT041509E Remote Controller 44 Part 5 Remote Controller 1 Remote Controller 45 ...
Page 118: ...Revision History Month Year Version Revised contents 07 2015 SiMT041509E First edition ...
