Gizmos and gadgets
LED emit light when this flows through
electrical current flow
Phase loss, phase imbalance, over current and voltage faults can be prevented and protected by
Three phase motor protection modules
A resistor whose resistance varies with Temp
Thermistor
Anti short cycle prevents
Rapid cycling of equipment
Time delay device is a
Single function device
Cad cells ______ from ____ to ____ when exposed to light from an oil burner flame
resistance drops, high to low
Phase loss prevents what from being what
three phase from being single phase
Most ______ display diagnostic codes to the technician using a blinking LED
Furnace control modules
a delay on maker prevents two major loads starting simultaneously by
delaying the circuits closure
Semiconductors are between what
conductors and insulator
Transducer converts physical pressure into usable electrical signal for what?
Electrical controls
This part of the motor uses a thermistor placed inside to sense the temperature of the MOTOR WINDINGS
Electrical motor Overload
The heat pump CONTROLL module controls
Defrost cycle, The compressor contactor and the reversing valve solenoid
Circuits are susceptible to
Heat, electrical interference, static electricity, current surges and voltage spikes
Before solid state devices the Vacuum tube was the most used electrical component in electrical equipment also know as
Electron Tube or a Valve
What helps the output strength of a signal without changing the original information in the signal
Transistor
The stepper motor is controlled by an _______ to regulate the opening position of the____
Heat pump control module includes these 3 safeties/sensors
Safety switches, defrost sensors, signals from the room thermostat
Trouble shooting electronic controls the technician can refer to
Wiring diagrams, diagnostic charts, error code guides
A triac is a AC switching device made up of _____ in a ______ package
two diodes, single
Diodes and rectifiers are practically the same thing however one is different because
rectifier changes AC to DC
Electronic expansion valve (EEV)
In a gas furnace the Electrical Control Modules controll
Handle ignition, monitor safety, manage blower and draft inducer, and provide system diagnostics
Defrosting the heat pump, furnace operation, motor controls, timing, and temp regulation
Testing an electronic control module, a tech should first
check input signals are going to the correct output signals