Explore more HVAC questions
for other HVAC topics now!
What is system overshoot
name two methods used to change pressure changes into action
In a capacitor-start, capacitor-run motor, are the capacitors connected in series or in parallel during start-up?
How does a time-delay fuse protect a motor?
A standard gas furnace does not have a
Describe a high pressure control
Why could older motors operate under overload conditions longer than modern motors?
What do the Floor Drain Tanks collect?
What is an acceptable temperature rise for an open-frame motor'?
Which components in the Instrument/Service Air System are included in Tech Specs and which Tech Specs?
There is a growling/rumbling noise at the AC compressor when the system is off and the engine is running. The noise stops when the system is turned on.Tech A says that a bad compressor bearing could be the cause. Tech B says that a bad compressor clutch bearing could be the cause. Who's correct?
Low heater output can be caused by all EXCEPT
How are the Chemical Drain Tank contents processed? They are:
When is a start capacitor disconnected from the circuit?
Which two plant systems are affected by Technical Specifications that have an interrelationship with the Instrument/Service Air System?
A capacitor increases the starting torque of a motor to______ % of its full-load power
When the oil supply is above the oil burner pump, the pump and supply would normally be a ____.
Which of the following sensors is not an NTC thermistor ?
A customer complains of low air flow through the instrument panel duct outlets. Which of the following could be the cause?
A vehicle with R134a refrigerant in the ac system has a refrigerant leak. Tech A says that a propane gas leak detector should be used to find the leak. Tech B says an electronic detector should be used. Who's right ?
The readings on a manifold gauge are 5psi low and 80 psi high with the AC system operating at an ambient temp of 85 degrees Fahrenheit. What do the readings indicate ? Normal operation, low refrigerant level, a restriction on the high side, or a damaged compressor ?
Latent heat of vaporization
When any product containing hydrogen and/or carbon reacts with oxygen to release heat energy, the process is called ?
What is the low level trip for the Floor Drain Tank Pumps?
What is the major disadvantage of using a line fuse as a motor protector?
Ton of refrigeration
How much greater is the starting current than the running current of a three-phase squirrel-cage motor?
What is the working voltage of a capacitor?
what is the max amperage usually found in a line voltage thermostat
How is the motor heat generated in a hermetic compressor dissipated?
Which element of a magnetic overload starter carries the full motor current?
How do microelectronic or electronic thermostat handel system overshoot and system lag
What would happen if the narrow spray angle nozzle were used in a round combustion chamber?
What meters flow of fuel oil into the chamber
Melting ice requires
A customer with an SATC equipped vehicle complains the car does not get cool enough on hot days. Tech A says the blend door actuator is probably malfunctioning. Tech B says the programmer is the problem. Who is right?
Customer complains of a foul odor from the dash when the AC and blower are on. Tech A says a clogged evaporator drain is the cause. Tech B says it's caused by bacteria growing on the evaporator. Who is right?
All of the following could cause lower than normal high side pressure EXCEPT