Control At Heat Start-Up - Technibel GRF314M35IAA Technical & Service Manual

8-5-2. HEAT operation
(1) The fan speed is changed as shown in the figure
below, based on the outdoor air temperature and the
operating frequency.
5°C or below
Outdoor air
5°C
Fan H
Fan H
(2) The fan speed is changed as shown in the figure
below based on the highest temperature of the indoor
heat exchanger for connected indoor units (including
stopped units).
(°C)
60
Fan L
58
Conditions of (1)
54
(Increase)

8-6. Control at HEAT Start-up

If HEAT operation is started when the outdoor air
temperature is 15°C or below, the unit operates at the
HEAT start-up frequency (70 Hz or above).
Reset conditions
1 The compressor frequency exceeds the start-up
frequency of 70 Hz.
2 The compressor thermostat is OFF.
3 Frequency reduction for indoor high-load control has
occurred.
4 The outdoor air temperature is above 15°C.
5 The main-unit switch on one or more indoor units is
set to TEST run.
Above 5°C
Above 35 Hz
Fan H
19 Hz Frequency
Fan L
Less than 35 Hz
Stop operation
Maintain previous status
Fan L
Conditions of (1)
(Decrease)
19