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1
Mini VRF SYSTEM
Control Functions
(1)
*
(2)
(3)
(4)
*
2-1. Compressors Mounted on Outdoor Units
2-2. Compressor Stop Rules
2-3. Roadmap Control
After a compressor stops, it will not start again for a period of 3 minutes (3 minutes forced OFF). However, this
does not apply to the Special Control described later, when operation of the compressor is forcibly stopped as
part of a control operation.
The controls listed below are performed according to the pressure sensor attached to the outdoor unit and
temperature thermistor attached to the indoor / outdoor unit heat exchanger.
With roadmap control, the pressure detected by the pressure sensor is converted to saturation temperature
before it is used. The temperature that has been converted to the saturation temperature is called the pres-
sure sensor temperature.
This control is performed every 30 seconds.
In the evaporation temperature control and condensation temperature control shown in Figs. 1 and 2, the tem-
peratures used to judge each area (A, AB, B, and C) may vary depending on the relationships among factors
including the difference between the room temperature setting and the indoor unit air intake temperature (= air
intake temperature difference) and the difference between the air discharge temperature setting and the air
discharge temperature (= air discharge temperature difference).
Definitions of the evaporation temperature and condensation temperature
Evaporation temperature (=Te) :
Condensation temperature (=Tc) :
Cooling mode :
Heating mode :
Lowest temperature of the heat exchangers (E1, E3) in all indoor units.
The value used for judgment in Cooling mode and Heating mode is different
depending on the mode.
The outdoor unit pressure sensor temperature or the outdoor unit heat
exchanger liquid temperature, whichever temperature is higher.
The outdoor unit pressure sensor temperature or the indoor unit heat
exchanger temperature (E1) when the heating thermostat is ON, whichever
temperature is higher.
The E3 temperature may indicate the temperature of superheated gas. Therefore it is not included for detection
of the condensation temperature (=Tc).
4HP 5HP 6HP
DC Inverter
Compressors mounted
Type
Rotary
Capacity
2. Compressor Control
SM830195-04_Mini VRF SYS.indb 3 15/03/10 17:47:31
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