Year-Round Cooling-Only Function - Daikin FTX25JVEA9 Service Manual

System control
3.20

Year-Round Cooling-Only Function

Outline This function turns off the compressor based on the conditions of the outside temperature and
high pressure equivalent saturation temperature to ensure compressor reliability.
Details The year-round cooling-only function provides two types of shutdown function. One is based on
the outside temperature and high pressure equivalent saturation temperature, and the other is
based only on the outside temperature.
The shutdown function based on the outside temperature and high pressure equivalent
saturation temperature stops the operation when sufficient differential pressure cannot be
ensured in the compressor.
The shutdown function based on the outside temperature prevent compressor operation when
the temperature is outside of the operation area.
" Shutdown based on outside temperature and
138
high pressure equivalent saturation
temperature
ON
18˚C
When this condition
remains for 15 minutes:
forced thermostat OFF
Outside air temperature
" Shutdown based on outside temperature only
When outside temperature is -5°C or lower:
forced thermostat OFF
18 ˚C
(M1028)
Si18-201
Main Functions