Carrier 40MBFAQ Service Manual

Also see for 40MBFAQ: Owner's manual Installation instructions

40MBFAQ: Service ManualManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.8The AUTO fan is controlled by the rules shown in Fig. 11.A220984Fig. 11 — Indoor Fan Running RulesEvaporator Temperature ProtectionWhen the evaporator temperature is lower than the setting value, thecompressor stops.HEATING ModeIndoor Fan Running RulesWhen the compressor is on, the indoor fan can be set to high/med/low/auto/mute. When the indoor unit coil temperature is low, the anti-cold airfunction starts and the indoor fan motor runs at a low speed and the speedcan not be changed. When the temperature is lower than the setting value,the indoor fan motor stops.When the indoor temp reaches the setting temperature, the compressorstops and the indoor fan motor runs at the minimum or setting speed (theanti-cold air function is valid). The indoor fan is controlled by the rulesshown in Fig. 12.A220985Fig. 12 — Indoor Fan Running RulesAuto Fan Action in HEATING ModeA220986Fig. 13 — Auto Fan Action in HEATING ModeDEFROST ModeIf any one of the following items is satisfied, the unit enters theDEFROST mode. After the compressor starts and runs, mark theminimum value of T3 from the 10th minute to the 15th minute as T30.1. If the compressor runs for 29 minutes and T3 < TCDI1, T3 ＋T30SUBT3ONE ≦ T30.2. If the compressor runs for 35 minutes and T3 < TCDI2, T3 ＋T30SUBT3TWO ≦ T30.3. If the compressor runs for 29 minutes. and T3 < TCDI3 for threeminutes.4. If the compressor runs for 120 minutes and T3 < 5°F (−15°C).Defrost EndIf any one of the following items is satisfied, the DEFROST mode endsand the machine reverts to the normal HEATING mode.• T3 increases to a point higher than TCDE1.• T3 maintains a point higher than TCDE2 for 80 seconds.• Unit runs for 10 minutes in DEFROST mode.A220987Fig. 14 — Defrost Action..........................................................................a12°F (6°C)T1-75.2°F (24°C)........................10°F (5°C)b ................................................c8°F (4°C)5°F (2.5°C)d2°F (1°C)eH(H-L)*0.75+L(H-L)*0.5+L(H-L)*0.25+LLSetting FanSpeed Actual Fan SpeedH =HH+(H+=H+G)M(M=M)L(L=L)L+(L+=L+D)H- H-=H-G)M+(M+=M+Z)L-(L-=L-D)M-(M-=M-Z)LHT1-Td + 1.5 °C (3°F)M-3°F(-1.5°C)-5°F(-3.0°C)-8°F(-4.5°C)-3°F(-1.5°C)-5°F(-3.0°C)-8°F(-4.5°C)-3°F(-1.5°C)-5°F(-3.0°C)-8°F(-4.5°C)........................T1-Td+3°F(1.5°C).......................................................L(H+-L)*0.2+L(H+-L)*0.4+L(H+-L)*0.6+L(H+-L)*0.8+LH+...............................0°F(0°C)-2°F(-1°C)-4°F(-2°C)-6°F(-3°C)-7°F(-4°C)-9F(-5°C)-11°F(-6°C)-12°F(-6.5°C)CompressorOutdoor fan4-Way valveX1 10S10Sno longer than 10minX2