Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 115 / 419

SiUS342004EB Outline of Control (Indoor Unit)
Part 4 Functions and Control 108
min. or less than –1°C (30.2°F) for a cumulative period of 40 min., freeze-up prevention operation
will be conducted. If the evaporator inlet temperature is kept at more than 7°C (44.6°F) for a
consecutive period of 10 min., the freeze-up prevention operation will be reset.

6. Thermostat status

7. The following models have the drain pump as standard equipment.
FXFQ-AA, FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXDQ-M, FXSQ-TA,
FXSQ-TB, FXMQ-PB, FXMQ-TB

8. Program dry display
No set temperature and airflow rate of the remote controller are displayed.
 9. Thermostat status
Set temperature when operating the program dry mechanism.
 10. Fan operation
By setting the remote controller to Fan, the fan will operate with thermostat OFF in set temperature
control operation mode.

11. Set wind direction
According to wind direction instruction from the remote controller, the wind direction is set to 100%
horizontal while in heating operation.

12. Fan
According to fan speed instruction from the remote controller, the fan is put into operation in LL
mode while in heating operation.
 13. Wind direction
When the heating thermostat turns OFF, the wind direction will be set to 100% horizontal.

14. Hot start
After the start of heating operation or the end of defrost operation, the hot start control will terminate
if the temperature at the condenser outlet (indoor heat exchanger liquid pipe temperature) exceeds
34°C (93.2°F), or if Tc is above 52°C (125.6°F), or if 3 minutes have elapsed.

15. Thermostat status

16. Outlet air temperature drop protection
When the set temperature is below 24°C (75.2°F) or the electronic expansion valve opening is
small, the protection will be activated.

17. Hu indicates the Humidifier connected to the wiring modification adaptor.
It is not related to the Humidifier terminals on the PCB of FXTQ-TA, FXTQ-TB, or CXTQ-TA.
 18. Only for CXTQ-TA.
Refer to
Gas Furnace Control (CXTQ-TA Models)
on page 128 for details.
OFF
ON
a b
Set temperature
a = b = 1°C (1.8°F) or 0.5°C (0.9°F)
The values a and b depend on the field setting 12(22)-2.
Suction air temperature
b a
–2°C (28.4°F) –4°C (24.8°F)
Suction air temp.
Set temp.
b
a
(3)
(2)
(1)