Exam 15: Troubleshooting Basic Controls

A(n) ____ is the easiest diagram to use to follow a circuit. This diagram normally can be studied briefly, and the circuit function should become obvious.

When using a ten-wrap multiplier, the reading on the meter must be multiplied by ten.

What is the amperage capacity of a 240-V/24-V control transformer with a 40 VA rating?

When checking thermostat circuits, an insulated jumper wire is a handy tool.

What three devices are usually found in series with the "Y" terminal of a low voltage control circuit?

The cooling anticipator in a thermostat is usually an adjustable type.

Without _________________________ voltage, there is no low voltage.

In a high voltage circuit, is the fan motor a power-passing or power-consuming device?

Explain how to read very low currents in a control circuit using a clamp-on amp meter.

The heat anticipator in a thermostat is usually an adjustable type.

While troubleshooting a 24-V control circuit consisting of a thermostat, a pressure control, and a contactor coil, the technician reads 24 volts across the thermostat, 0 volts across the pressure control, and 0 volts across the contactor coil. The technician makes the following statements. The following statements are all considered to be true. A) The transformer is burned out. B) The thermostat is open. C) The contactor coil is energized.

Electrical controls are divided into two categories: power-consuming and _________________________.

A control can be which of the following?

A 10-wrap amperage multiplier is used with a(n) ____.

How is the heat anticipator normally wired to the heating contacts?

How is the cooling anticipator normally wired to the cooling contacts?

When conditions are correct, the rheostat will pass power through the device onto the system components to be controlled.

An example of a power consuming device would be a(n) ____ while an example of a non-power consuming device would be a(n) ____.

When applying a voltmeter to measure the voltage of a power source, on what range is the meter set?

If line one of a circuit had a potential of 120 V and line two was neutral, the potential voltage (difference) between line one and line two would be zero volts.