MXS Service Manual

RA Indoor Unit Functions SiUS121736EA
57 Functions and Control
CDXS, FDXS, FVXS series
Ex: When the target temperature is 25°C (77°F)
Cooling → 23°C (73.4°F): Thermostat OFF → 22°C (71.6°F): Switch to heating
Heating → 26.5°C (79.7°F): Thermostat OFF → 27.5°C (81.5°F): Switch to cooling
2.5 Thermostat Control
Outline Thermostat control is based on the difference between the room thermistor temperature and the
target temperature.
Details Thermostat OFF Condition
 The temperature difference is in the zone A.
Thermostat ON Conditions
 The temperature difference returns to the zone C after being in the zone A.
 The system resumes from defrost control in any zones except A.
 The operation turns on in any zones except A.
 The monitoring time has passed while the temperature difference is in the zone B.
(Cooling: 10 minutes, Heating: 10 seconds)
Cooling
Heating
CTXG, FTXR series
Target temperature + 2.5˚C (+4.5˚F)
Heating Operation
Target temperature – 3.0˚C (–5.4˚F)
Cooling Operation
(R22000)
Target temperature – 2.0˚C (–3.6˚F)
= Thermostat OFF
Target temperature + 1.5˚C (+2.7˚F)
= Thermostat OFF
Zone B
Zone B
Zone A
Zone A
OFF
OFF
ON
ON
Zone C
Zone C
Room thermistor temperature – target temperature
–1.0˚C (–1.8˚F)
–2.0˚C (–3.6˚F)
(R24031)
–0.5˚C (–0.9˚F)
–1.5˚C (–2.7˚F)
Zone B
Zone A
OFF
ON
Zone C
1.5˚C (2.7˚F)
0.5˚C (0.9˚F)
0˚C (0˚F)
1.0˚C (1.8˚F)
Room thermistor temperature – target temperature
(R24032)