What could cause a false high reading for the supply air temperature?
What could cause a false high reading for the supply-air temperature? If the temperature is taken with the blower on at the same time the heating elements are on. … If the probe is inserted in the supply plenum in a direct line of sight with the heating elements.
What is the first step a technician should take when changing out a capacitor?
What is the first step a technician should take when changing out a capacitor? The first operation in testing a capacitor is to: Discharge it. Dual-element time-delay fuses must be used.
What does a technician look for when testing limits in an electric furnace using an ammeter?
63-2) Describe how a clamp on ammeter can be used to check an electric furnace. An ammeter can identify which strips are working and if they are drawing the correct current.
What problems can be caused by over lubricating a blower motor quizlet?
What problems can be caused by over lubricating a blower motor? This could eventually cause the motor windings to short out. What would happen if metal debris fell into the heating element? The debris could cause the heating element to turn on.
When performing an operation check the technician should consult the?
One performing an operation check come on be sure to consult the. Routine maintenance, pre start inspection, operational checks., and troubleshooting.
Where does my thermostat check temperature?
Thermostats measure the temperature of the room that they are placed in via an air sensor and/or a floor sensor.
When testing a capacitor The first thing a technician should do is?
The first and most simple is to inspect the capacitor. If it appears “blotted” or swelled, it is a safe bet that it is bad. It is good practice to go ahead and perform the following test even though it is swelled. Make a sketch of the wires connected to the capacitor and note the colors or numbers that identify them.
When replacing motor capacitors technicians should be sure the new capacitor is rated within what percentage of the original?
It is always best to use a replacement run capacitor which exactly matches the MFD and voltage rating of the original run capacitor. However, if this is not possible, a replacement run with a MFD rating of plus or minus 10 percent of the original MFD rating can be safely used.
When replacing fuses Be sure to match which of these ratings?
When replacing a fuse, always follow the manufacturer’s specifications or match the amperage of the fuse that you’re replacing. Never use a fuse with an amp rating greater or less than that of the circuit wiring. For example, do not use a 20-amp fuse on a circuit with 15-amp wiring.
Which troubleshooting tool would a technician use to check for continuity of a circuit?
Because of the different factors involved in testing. A Voltmeter, ohmmeter, or continuity test can be used to test these circuits.