What is used in the ECM to increase the HEUI solenoid actuation voltage?
A. coil
B. power transistors
C. bridge resistors
D. current modulation
Answer: A
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Which of the following mini-split system indoor units requires a condensate pump because gravity condensate draining is never feasible for this type of installation?
A) Floor mount B) Wall mount C) Ceiling suspended D) All of these
Which type of A-to-D converter uses comparators?
A) Dual-Slope B) Successive approximation C) Flash D) All of the above
El agua fría no puede conectarse con:
a. equipo de manejo de aire. b. serpentines de ventilador de habitaciones. c. unidades de inducción. d. un calentador de agua caliente.
Which of the following is another type of low ambient temperature head pressure control?
A. pressure-controlled dampers in the condenser air stream B. programmed defrost timer C. timer and liquid line solenoid for automatic pump down D. compressor internal heat