Q1. This part of a circuit is a DC regulate power supply.
T1 is a main transformer which convert the voltage from the mains to a different, usually lower, voltage. The AC input voltage 220V or 120V is convert to a smaller 12.6V AC voltage. Next this voltage is rectifier (BR1) and smooth by C22 and C16 capacitors.
After this we get a DC voltage (17.7V).
U11 is a voltage regulator. A voltage regulator provides constant DC +12V output voltage and contains circuitry that continuously holds the output voltage at the design value regardless of changes in load current or input voltage.
Q2. U2 - It' a PLD circuit a programmable logic device. Se we can not tell how this circuit work. The only think that we can tell is that this part of a circuit is some kind of a control circuit. Based on the input signal states U2 controls the motor, heater and other part of a circuit.
Q3. This part of a circuit is a motor driver.
U9 provides opto-isolation between low control voltage and and high voltage needed to start the motor. http://www.youtube.com/watch?v=DRZAGN71-Ns
Based on the input signal states U9 turns on (trigger) the triacs and triac turns the motor to run in reverse direction.