Carrier 40MAQ Series Service Manual

Also see for 38MAQ Series: Owner's manual Product data Owner's manual Owner's manual

Carrier 40MAQ Series Service Manual Manual pdf 28 page image

28AUTO MODEIn the Auto mode, the temperature can be set to values between62~86F (17~30Ԩ). In this mode, the machine will choosecooling, heating or fan- only mode according to ΔT.NOTE: ΔT =T1- Ts, where T1 represents the indoor roomtemperature and Ts represents the set temperature.ΔT=T1- Ts Running modeΔT＞2F Cooling- 1<ΔT≤2F Fan- onlyΔT≤- 2F HeatingIndoor fan will run at an automatic fan speed for each running mode.The louver will also operate depending in relevant mode taking place.If the machine switches mode between heating and cooling, thecompressor will stop for 15 minutes and then choose a modeaccording to ΔT.If a new set temperature is commanded, the system will choose arunning mode according to ΔT.FORCED OPERATION FUNCTIONWhen the machine is off, pressing the manual button will carry themachine to forced auto mode. Pressing the button once again,within 5 seconds, the machine will turn into forced cooling mode.In forced auto, forced cooling or any other operation mode,pressing the manual button will turn off the machine.When in this mode, all general protections are available.Forced cooling mode:The compressor runs at F2 frequency and indoor fan runs asbreeze.After running for 30 minutes, the machine will turn to auto modewith a 75_F (24℃) set temperature.Forced auto mode:The action of forced auto mode is the same as normal auto modewith a 75_F (24_C) set temperature.TIMER FUNCTIONTiming range is 24 hours.The timer function will not change the system’s current operationmode.The setting time is relative time.Timer onThe machine will turn on automatically when reaching the set time.Timer offThe machine will turn off automatically when reaching the settingtime.Timer on/offThe machine will turn on automatically when reaching the set “on”time, and then turn off automatically when reaching the set “off”time.The timer function will not change the AC current operation mode.Suppose AC is off now, it will not start up first after setting the“timer off” function. And when reaching the setting time, the timerLED will turn off and the AC running mode will not change.SLEEP MODE FUNCTIONOperation time in sleep mode is 7 hours. After 7 hours the systemturns off.Operation process in sleep mode is as follow:SLEEP MODE - COOLINGWhen in cooling mode, the set temperature rises 1.8_F (1_C) (upto a maximum 86_F (30_C)) every one hour. Two hours later theset temperature stops rising and indoor fan is fixed at low speed.Set pointTime (hour)1 21.8 °F (1°C)1.8 °F (1°C)Fig. 34 – Sleep Mode - HeatingWhen in heating mode, the set temperature decreases 1.8_F (1_C)(down to a minimum 62_F (17_C)) every one hour. Two hourslater the set temperature stops rising and indoor fan is fixed at lowspeed.NOTE: Anti-cold wind function has the priority.Set pointTime (hour)1 21.8 °F (1°C)1.8 °F (1°C)Timer setting is available.When the user uses timer off function in sleep mode (or sleepfunction in timer off mode), if the timing is less than 7 hours, sleepfunction will be cancelled when reaching the setting time. If thetiming is more than 7 hours, the machine will not stop until itreaches the set time in sleep mode.AUTO-RESTART FUNCTIONThe indoor unit is equipped with auto-restart function, which iscarried out through an auto-restart module. In case of a suddenpower failure, the module memorizes the setting conditions presentprevious to the power failure. The unit will automatically resume tothe previous operation settings (not including swing function) 3minutes after the power returns.If the memorization condition is forced cooling mode, the unit willrun in cooling mode for 30 minutes and turn to auto mode at a75_F (24_C) set temp.If unit is off before power off and unit is required to start up now,the compressor will have 1 minute delay when power on. Otherconditions, the compressor will have 3 minutes delay when restarts.If the equipment was off before the power went off, and it isrequired to start up after this power failure, the compressor willhave a 1 minute delay when powering on. In other conditions, thecompressor will have a 3 minutes delay at re-start.